Electric brake mechanism

Abstract

The utility model relates to the technical field of automobile brakes, in particular to an electric brake mechanism which comprises a driving motor, a sliding cylinder and a screw rod piece, the driving motor is provided with a rotor main shaft, a nut piece is arranged on the rotor main shaft, and the screw rod piece is arranged in the nut piece in a screwed mode. The free end of the lead screw piece is arranged in the sliding cylinder in a telescopic mode and used for being connected with a brake pad of an external automobile brake, and the driving motor drives the nut piece to rotate forwards or reversely through the rotor main shaft so that the lead screw piece can be in linkage with the brake pad of the automobile brake to conduct linear motion. And further, the brake pad abuts against a brake disc of an external automobile brake to generate braking force. According to the electric brake mechanism, through the design of the driving motor and the ball screw, the response speed and the brake control precision of a brake system of a medium-large truck are improved. Meanwhile, low-temperature adaptive lubricating oil and a protective heating device are adopted, it is guaranteed that lubrication and axial movement of the lead screw piece are not affected in the high-temperature and low-temperature environment, and the device adapts to various extreme weather conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile brakes, and in particular discloses an electric brake mechanism. Background Art

[0002] The utility model relates to the field of automobile brake technology, and in particular discloses an electric brake mechanism. Traditional hydraulic brake systems have problems such as response lag, insufficient braking force distribution accuracy, and poor thermal stability. Although the existing electric brake mechanism improves the response speed by driving the screw through the motor, it does not fully consider the impact of the low temperature environment on the transmission performance. Especially in cold environments, the lubricating oil in the slide tube tends to become viscous or solidify, resulting in increased movement resistance of the screw rod or even stuck, seriously affecting the reliability of the brake response and driving safety. The existing technology lacks an active thermal compensation solution for low temperature working conditions, and cannot guarantee the stable operation of the brake mechanism within a wide temperature range. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide an electric brake mechanism to solve the above technical problems.

[0004] To achieve the above-mentioned object, the utility model provides an electric brake mechanism, comprising a drive motor and a screw member, wherein the drive motor comprises a stator member, a rotor main shaft rotatably disposed within the stator member, the rotor main shaft being provided with a nut member, the screw member being threadedly disposed within the nut member, the screw member being telescopically disposed relative to the nut member and being used to connect to a brake pad of an external automobile brake, the drive motor driving the nut member to rotate forward or reverse via the rotor main shaft so that the screw member, in conjunction with the brake pad of the automobile brake, performs reciprocating motion;

[0005] The electric brake mechanism also includes a slide cylinder arranged in the stator, and the screw rod is slidably arranged in the slide cylinder; a guide bar is provided in the slide cylinder to slide with the screw rod, and the guide bar is used to prevent the screw rod from rotating relative to the slide cylinder.

[0006] The free end of the screw rod is provided with a flexible sealing gasket, and lubricating oil is provided between the outer wall of the screw rod and the inner wall of the slide cylinder. The free end of the screw rod is slidably arranged in the slide cylinder via the sealing gasket and the lubricating oil;

[0007] The outer wall of the slide is provided with a protective heating device and a temperature sensor. The protective heating device is powered by an external power supply and connected to the temperature sensor. When the temperature sensor detects that the ambient temperature of the brake mechanism is lower than a preset value, the protective heating device heats the lubricating oil in the slide to prevent it from solidifying at low temperature and limiting the axial movement of the screw rod.

[0008] Furthermore, the drive motor is an inner-rotating motor, which includes a motor housing. The stator component has a stator core arranged in the motor housing. The rotor main shaft is located inside the stator core, and both ends of the rotor main shaft are rotatably arranged in the motor housing via bearings.

[0009] Furthermore, the rotor main shaft is arranged in a cylindrical shape, and the outer wall of the rotor main shaft is provided with multiple magnetic parts used in conjunction with the stator core. The multiple magnetic parts are arranged around the central axis of the rotor main shaft, and the end of the rotor main shaft away from the slide protrudes out of the motor housing.

[0010] Furthermore, it also includes an electronic control unit and at least two inductive travel switches spaced apart on the side walls of the slide, the inductive travel switches being connected to the drive motor via the electronic control unit, the two inductive travel switches being used to monitor the travel and position information of the lead screw and transmit it to the electronic control unit, and the electronic control unit controlling the drive motor according to the two inductive travel switches to limit the lead screw from excessively moving out of or exiting the slide.

[0011] Furthermore, the electric brake mechanism also includes a fixing seat, one end of the slide is detachably connected to the motor housing via the fixing seat, and the other end of the slide is used to be detachably connected to the brake of the automobile brake system.

[0012] Furthermore, the lubricating oil is a low-temperature adaptable lubricating oil, which has a wide temperature resistance of -°C to °C, so as to ensure that the screw rod can operate normally in extreme temperature environments.

[0013] Furthermore, the drive motor is provided with an encoder and a servo controller. The encoder is installed at the end of the rotor main shaft away from the slide cylinder. The encoder is connected to the servo controller through a data acquisition circuit. The encoder is used to monitor the angular position and speed parameters of the rotor main shaft and feed back to the servo controller. The servo controller compares the preset braking instructions with the angular position and speed parameters of the rotor main shaft to control the forward and reverse rotation and speed of the rotor main shaft, thereby controlling the axial displacement distance of the screw rod.

[0014] Beneficial effects of the present invention: The present invention realizes real-time monitoring and active thermal control of the ambient temperature of the brake mechanism by providing a protective heating device and a temperature sensor on the outer wall of the slide. When the temperature is lower than the preset value, the system automatically activates the heating function, effectively preventing the lubricating oil from solidifying at low temperatures, ensuring that the screw rod can still move axially smoothly and reliably under extreme conditions, and significantly improving the response consistency and operational reliability of the brake system. This design overcomes the lubrication problem of traditional electric brake mechanisms under low-temperature conditions, enhances environmental adaptability, fundamentally avoids the risk of brake failure caused by oil solidification, and greatly improves driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the planar structure of the motor brake mechanism of the present utility model;

[0016] Figure 2 This is a partially cutaway structural diagram of the motor brake mechanism of the present invention;

[0017] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of part A;

[0018] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of part B.

[0019] Reference numerals include:

[0020] 1. Drive motor; 2. Slide; 3. Screw rod; 4. Inductive travel switch; 5. Fixed seat; 6. Encoder; 7. Protective heating device; 8. Temperature sensor; 10. Motor housing; 11. Stator core; 12. Rotor main shaft; 13. Nut; 21. Guide bar; 31. Sealing gasket; 32. Buffer gasket; 33. Baffle. DETAILED DESCRIPTION

[0021] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0022] See also Figures 1 to 4 As shown, an electric brake mechanism of the present invention includes a drive motor 1 and a screw member 3, wherein the drive motor 1 has a stator member, a rotor main shaft 12 rotatably arranged in the stator member, the rotor main shaft 12 is provided with a nut member 13, the screw member 3 is threadedly arranged in the nut member 13, the screw member 3 is telescopically arranged relative to the nut member 13 and is used to connect with the brake pad of an external automobile brake. The drive motor 1 drives the nut member 13 to rotate forward or reverse via the rotor main shaft 12 so that the screw member 3 links the brake pad of the automobile brake to reciprocate, causing the brake pad to produce a propulsion or release action to provide a stronger braking force.

[0023] Specifically, the electric brake mechanism also includes a slide 2 arranged in the stator component, and the screw component 3 is slidably arranged in the slide 2; a guide bar 21 is configured in the slide 2 and slideably cooperates with the screw component 3, and the guide bar 21 is used to prevent the screw component 3 from rotating relative to the slide 2.

[0024] When the drive motor 1 receives a braking signal, the motor's rotor main shaft 12 begins to rotate, driving the nut 13 fixed to it to rotate forward or reverse. The rotation of the nut 13, through its threaded engagement with the lead screw 3, converts the rotational motion into linear motion of the lead screw. Constrained by the guide bar 21, the lead screw 3 slides linearly along the slide 2, pushing the vehicle brake pads toward or away from the brake disc, thereby braking or releasing the brake. A sealing ring and dust cover are installed within the slide 2 to ensure the cleanliness and durability of the system.

[0025] The motor control system is integrated into the vehicle's electronic control unit (ECU), which adjusts the motor's speed and direction through signal feedback to achieve dynamic adjustment of braking intensity.

[0026] Specifically, the screw member 3 is a ball screw with an external thread. The inner surface of the nut member 13 has an internal thread. The external thread of the screw member 3 is screwed to the internal thread of the inner surface of the nut member 13 via a ball screw. The threaded portions of both the screw member 3 and the nut member 13 are made of high-hardness materials and undergo a surface heat treatment process to enhance wear resistance. The ball screw is also equipped with micro-lubrication holes, allowing for regular addition of lubricant to reduce wear and noise.

[0027] Specifically, the drive motor 1 is an inner rotating motor. The drive motor 1 includes a motor housing 10. The stator component has a stator core 11 arranged in the motor housing 10. The rotor main shaft 12 is located inside the stator core 11. The two ends of the rotor main shaft 12 are rotatably arranged in the motor housing 10 via bearings. The stator core 11 is an iron core bracket arranged on the inner wall of the motor housing 10 and a coil winding wound on the iron core bracket. The iron core bracket uses high magnetic permeability material to increase the magnetic field strength, and an insulating layer is added to the surface of the iron core to reduce eddy current loss. The coil winding is wound with high-temperature resistant copper wire and cured with heat-resistant glue to prevent insulation aging during long-term operation. The rotor main shaft 12 is installed in the motor housing 10 through two high-precision bearings at the front and rear to ensure its smooth rotation. The bearings are double-layer sealed to prevent dust from entering and extend service life.

[0028] Specifically, the rotor main shaft 12 is arranged in a cylindrical shape, and a plurality of magnetic parts are evenly embedded in the middle outer wall of the rotor main shaft 12. In addition to being used in conjunction with the stator core, it can also be used to detect the angular velocity and angular displacement of the rotor. The magnetic parts are made of neodymium iron boron material and have a high magnetic flux density. The magnetic parts can be matched with a position sensor, which can record the position information of each magnetic part and convert it into a rotor angular velocity signal, thereby providing accurate position information. The end of the rotor main shaft 12 away from the slide 2 protrudes out of the motor housing 10. During long-distance braking, the rotor main shaft 12 is hollow throughout, and one end is exposed to the air, which further improves the heat dissipation effect of the entire machine, makes the braking accuracy more controllable, and significantly increases the service life of the mechanism.

[0029] Specifically, the electric brake mechanism also includes an electronic control unit (not shown in the figure) and at least two inductive travel switches 4 spaced apart on the side wall of the slide 2. The inductive travel switch 4 is connected to the drive motor 1 via the electronic control unit. The side wall of the slide 2 is provided with two mounting holes. One end of the two inductive travel switches 4 is respectively mounted on the slide 2 through the mounting holes. The displacement signal of the lead screw member 3 detected by one end of the inductive travel switch 4 is transmitted to the electronic control unit. The electronic control unit controls the drive motor 1 according to the stroke and position information to limit the lead screw member 3 from excessively moving out of or exiting the slide 2, thereby avoiding excessive or insufficient braking.

[0030] Specifically, the electric brake mechanism also includes a mounting bracket 5. One end of the slide 2 is removably connected to the motor housing 10 via the mounting bracket 5. The other end of the slide 2 is used to removably connect to the brake of the vehicle's braking system. The mounting bracket 5 is removably connected to the motor housing 10 and the slide 2 via a snap or threaded design, facilitating disassembly and maintenance. The other end of the slide 2 is connected to the brake housing of the braking system via a slot, ensuring a secure structure. The mounting bracket 5 is made of a lightweight alloy material, which provides high strength and shock resistance while reducing overall weight.

[0031] Specifically, a flexible sealing gasket 31 is provided at the free end of the screw member 3 to prevent the lubricating oil in the slide 2 from leaking. A buffer gasket 32 ​​and a baffle 33 are provided at the other end of the screw member 3. The baffle 33 and the sealing gasket 31 cooperate to mainly seal the cavity of the slide 2 to prevent the lubricating oil from leaking outward in the gap between the screw member 3 and the slide 2. It provides a closed space for the internal lubricating oil, ensuring that the lubricating oil is always filled in the spiral area of ​​the ball screw, thereby ensuring the continuity and consistency of the lubrication effect. In addition, the baffle 33 structurally provides an end stop point for the screw member 3. The axial stroke of the screw member 3 is physically limited by the baffle 33 to avoid excessive retraction.

[0032] The buffer pad 32 is made of a flexible material. During brake operation, the lead screw 3 may be subjected to a significant axial reaction force. This provides additional cushioning when the lead screw 3 reaches its travel limit, absorbing some of the impact energy and thus reducing the impact of mechanical shock on the ball screw and motor components. This cushioning effect extends the life of the overall structure and reduces wear. When the lead screw 3 reaches its limit, the buffer pad 32 absorbs some of the energy, reducing the noise caused by direct metal-to-metal contact and improving the comfort and quietness of the brake mechanism.

[0033] Lubricating oil is filled between the outer wall of the screw rod 3 and the inner wall of the slide 2 to ensure lubrication and smooth movement of the ball screw. The sealing gasket 31 is made of high-temperature and low-temperature resistant materials and is suitable for use in various climate conditions.

[0034] Specifically, the lubricating oil is a low-temperature adaptable lubricating oil, and the lubricating oil has a wide temperature resistance of -40°C to 120°C, so as to ensure that the screw member 3 operates normally in an extreme temperature environment.

[0035] Specifically, a protective heating device 7 is installed on the outer wall of the slide 2, powered by an external power supply and connected to a temperature sensor. When the temperature sensor 8 detects that the ambient temperature is below a set value, the protective heating device 7 activates, ensuring that the lubricating oil does not solidify in the low-temperature environment. The temperature sensor 8 uses a high-precision thermal resistor to monitor external environmental changes in real time and precisely control the on / off of the protective heating device 7.

[0036] Specifically, the drive motor 1 is equipped with an encoder 6 and a servo controller. Encoder 6 is mounted on the end of the rotor spindle 12 away from the slide 2. It detects the spindle's angle and speed and feeds this data back to the servo controller. The servo controller compares this information with preset braking instructions and controls the rotation direction and speed of the rotor spindle 12 in real time, precisely adjusting the displacement of the lead screw 3 and achieving precise braking control.

[0037] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. An electric brake mechanism, characterized in that: The invention comprises a driving motor (1) and a screw member (3), wherein the driving motor (1) comprises a stator member, a rotor main shaft (12) rotatably arranged in the stator member, the rotor main shaft (12) is provided with a nut member (13), the screw member (3) is threadedly arranged in the nut member (13), the screw member (3) is telescopically arranged relative to the nut member (13) and is used to connect with the brake pad of an external automobile brake, and the driving motor (1) drives the nut member (13) to rotate in a forward or reverse direction via the rotor main shaft (12) so that the screw member (3) and the brake pad of the automobile brake are linked to perform reciprocating motion; The electric brake mechanism further comprises a slide cylinder (2) arranged on the stator component, wherein the screw rod component (3) is slidably arranged in the slide cylinder (2); a guide bar (21) is arranged in the slide cylinder (2) and is slidably matched with the screw rod component (3); the guide bar (21) is used to prevent the screw rod component (3) from rotating relative to the slide cylinder (2); A flexible sealing gasket (31) is provided at the free end of the screw rod (3), lubricating oil is provided between the outer wall of the screw rod (3) and the inner wall of the slide cylinder (2), and the free end of the screw rod (3) is slidably arranged in the slide cylinder (2) via the sealing gasket (31) and the lubricating oil; The outer wall of the slide (2) is provided with a protective heating device (7) and a temperature sensor (8). The protective heating device (7) is powered by an external power supply and is connected to the temperature sensor (8). When the temperature sensor (8) detects that the ambient temperature of the brake mechanism is lower than a preset value, the protective heating device (7) heats the lubricating oil in the slide (2) to prevent it from solidifying at low temperature and thus limiting the axial movement of the screw member (3).

2. The electric brake mechanism according to claim 1, characterized in that: The drive motor (1) is an inner-rotating motor, comprising a motor housing (10), the stator having a stator core (11) arranged in the motor housing (10), the rotor main shaft (12) being located inside the stator core (11), and both ends of the rotor main shaft (12) being rotatably arranged in the motor housing (10) via bearings.

3. The electric brake mechanism according to claim 2, characterized in that: The rotor main shaft (12) is arranged in a cylindrical shape, and the outer wall of the rotor main shaft (12) is provided with a plurality of magnetic parts used in conjunction with the stator core (11). The plurality of magnetic parts are arranged around the central axis of the rotor main shaft (12), and one end of the rotor main shaft (12) away from the slide cylinder (2) protrudes out of the motor housing (10).

4. The electric brake mechanism according to claim 1, characterized in that: The invention also includes an electric control unit and at least two inductive travel switches (4) spaced apart on the side wall of the slide (2). The inductive travel switches (4) are connected to the drive motor (1) via the electric control unit. The two inductive travel switches (4) are used to monitor the travel and position information of the lead screw member (3) and transmit the information to the electric control unit. The electric control unit controls the drive motor (1) according to the two inductive travel switches (4) to limit the lead screw member (3) from excessively moving out of or exiting the slide (2).

5. The electric brake mechanism according to claim 2, characterized in that: The electric brake mechanism further comprises a fixing seat (5), one end of the slide cylinder (2) is detachably connected to the motor housing (10) via the fixing seat (5), and the other end of the slide cylinder (2) is used for detachably connecting to the brake of the automobile brake system.

6. The electric brake mechanism according to claim 1, characterized in that: The lubricating oil is a low-temperature adaptable lubricating oil, and the lubricating oil has a wide temperature resistance of -40°C to 120°C, so as to ensure that the screw rod (3) operates normally in an extreme temperature environment.

7. The electric brake mechanism according to claim 1, characterized in that: The drive motor (1) is provided with an encoder (6) and a servo controller. The encoder (6) is installed at one end of the rotor main shaft (12) away from the slide cylinder (2). The encoder (6) is connected to the servo controller via a data acquisition circuit. The encoder (6) is used to monitor the parameters of the angular position and rotation speed of the rotor main shaft (12) and feed back the parameters to the servo controller. The servo controller controls the forward and reverse rotation and the rotation speed of the rotor main shaft (12) according to a preset braking instruction and the parameters of the angular position and rotation speed of the rotor main shaft (12), thereby controlling the axial displacement distance of the screw member (3).

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