CN114165537A - Electromechanical brake with parking function - Google Patents
Electromechanical brake with parking function Download PDFInfo
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- CN114165537A CN114165537A CN202111392833.3A CN202111392833A CN114165537A CN 114165537 A CN114165537 A CN 114165537A CN 202111392833 A CN202111392833 A CN 202111392833A CN 114165537 A CN114165537 A CN 114165537A
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- China
- Prior art keywords
- parking
- brake
- ball screw
- rotating
- push rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
- F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
- F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
- F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
- F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/38—Slack adjusters
- F16D65/40—Slack adjusters mechanical
- F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
- F16D65/56—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut
- F16D65/567—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut for mounting on a disc brake
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
- F16H63/3416—Parking lock mechanisms or brakes in the transmission
- F16H63/345—Parking lock mechanisms or brakes in the transmission using friction brakes, e.g. a band brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
- F16H63/3416—Parking lock mechanisms or brakes in the transmission
- F16H63/3458—Parking lock mechanisms or brakes in the transmission with electric actuating means, e.g. shift by wire
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/24—Electric or magnetic using motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
- F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
- F16D2125/40—Screw-and-nut
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/44—Mechanical mechanisms transmitting rotation
- F16D2125/46—Rotating members in mutual engagement
- F16D2125/50—Rotating members in mutual engagement with parallel non-stationary axes, e.g. planetary gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/58—Mechanical mechanisms transmitting linear movement
- F16D2125/68—Lever-link mechanisms, e.g. toggles with change of force ratio
Abstract
The invention discloses an electronic mechanical brake with a parking function, which comprises a parking brake mechanism and a service brake. The parking brake mechanism is used for realizing a parking function and comprises the following components: the parking device comprises a torque motor, a spline, a tension spring, an electromagnetic push rod, a parking energy storage spring, a pin spring, a parking ball screw mechanism, a parking pressure rod, a parking push rod and the like. The service brake is used for completing service braking, and comprises: the brake comprises a speed reduction and torque increase mechanism, a motion conversion mechanism, an automatic clearance adjustment mechanism, a caliper body, a brake disc, a brake block, a brake friction plate and the like. The effect of clearance automatically regulated mechanism is when the brake friction disc takes place wearing and tearing, can realize the automatically regulated of braking clearance, include: the transmission bolt, two claw runners, three claw runners, sprocket, chain. The invention solves the problems of uniform braking force distribution, low braking reliability, slow braking response and the like of the traditional electronic mechanical brake, and can realize the functions of automatic clearance adjustment and parking braking.
Description
Technical Field
The invention belongs to the technical field of automobile braking safety, and relates to a structure of an electronic mechanical brake with a parking function.
Background
With the development of society and the progress of science and technology, automobiles gradually evolve towards intellectualization and electronization. The traditional hydraulic braking system has the defects of slow braking response, complex overall structure, large overall size, hydraulic hysteresis and the like, and can not meet the requirements of light weight, electric control and intellectualization of the automobile. As a brand new brake system, the electronic mechanical brake system takes a motor as a power source, replaces a complex mechanical pedal with an electronic pedal, has the advantages of simple structure, small volume, high response speed, high control precision, energy conservation, environmental protection and the like, and has become a hotspot of research of people.
At present, a motion conversion mechanism of the electronic mechanical brake mainly adopts a ball screw mechanism, and a ball screw drives a screw nut so as to push a brake block to press a brake disc. Although the ball screw has the characteristics of high precision, long service life, stable work, high reliability and the like, the ball screw also has the defects of poor bearing capacity, high manufacturing cost and the like. If a larger force transmission is to be achieved, a larger spindle mechanism must be used, which influences the overall size of the brake to a certain extent. In addition, when the brake pad is driven by the sleeve, the force bearing area of the brake pad is small, which causes problems such as deformation of the brake pad and uneven distribution of braking force. In addition, the parking function of the present electromechanical brake is mainly realized by a mechanical operation, which affects the comfort and sensitivity of the operation.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides an electronic machine with a parking function, which comprises: the motion conversion mechanism adopts the serial transmission mode of the ball screw mechanism, the rotating connecting rod and the rotating connecting rod seat, has larger transmission ratio, can realize the reinforcement effect, reduces the dependence on the ball screw, is favorable for reducing the structural size of the brake and saves the cost. The parking brake mechanism adopts an electric drive electromagnetic push rod, cancels a complex mechanical operation mechanism, and has the characteristics of light operation and quick response. The double pistons are adopted to push the brake block, so that the stable transmission of the brake clamping force is realized, and the brake block is uniform in stress and not easy to deform. In addition, the electronic machine with the parking function also has the function of automatically adjusting the clearance, so that the problems of uniform braking force distribution, low braking reliability, slow braking response and the like of the conventional electronic mechanical brake are effectively solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an electromechanical brake with a parking function comprises a parking brake mechanism and a service brake, wherein the parking brake mechanism and the service brake are connected through a rotating shaft (25). The service brake comprises a speed reduction and torque increase mechanism (1), a motion conversion mechanism, an automatic clearance adjusting mechanism, a caliper body (13), a brake block (11), a brake friction plate (15) and a brake disc (12); wherein the two brake blocks (11) are arranged in the caliper body (13), the brake block (11-1) can axially move relative to the caliper body (13), and the brake block (11-2) is directly fixed on the caliper body (13); the brake friction plates (15) are respectively attached to the two brake blocks (11), the brake disc (12) is fixed on an automobile hub, the base (14) is installed on an automobile chassis, and the caliper body (13) can axially move relative to the base (14). When the automobile brake is in service braking, the torque motor (35) drives the motion conversion mechanism through the speed reduction and torque increase mechanism (1), the motion conversion mechanism drives the automatic clearance adjustment mechanism part to push the brake block (11), and the brake block (11) compresses the brake disc (12) through the brake friction plate (15) on the brake block to complete service braking.
The parking brake mechanism comprises a torque motor (35), a spline (33), a clamp body groove (28), a tension spring (31), an electromagnetic push rod (37), a parking energy storage spring (29), a pin (39), a pin spring (40), a parking ball screw mechanism (38), a parking pressure rod (27), a parking push rod (30) and a clamping groove (34). The parking ball screw mechanism (38) comprises a parking ball screw (38-1) and a parking screw nut (38-2). The parking ball screw (38-1) is directly processed on the rotating shaft (25), the parking screw nut (38-2) is connected with the parking ball screw (38-1) through a screw pair, and the left end of the parking ball screw nut abuts against the inner side of the left end of the parking pressing rod (27). The torque motor (35) is connected with the parking ball screw (38-1) through a spline (33). One end of the parking push rod (30) is connected with the close spring (31), the other end is connected with a rotating pair of the fixed rotating shaft (42), and the inner side of the middle part of the parking push rod is directly abutted against the electromagnetic push rod (37). The fixed rotating shaft (42) is fixed on the clamp body (13). One end of each of the upper tensioning spring and the lower tensioning spring (31) is fixed at the left end of the brake caliper body (13), and the other end of each of the upper tensioning spring and the lower tensioning spring is connected with the parking push rod (30). One ends of the two electromagnetic push rods (37) are respectively fixed at the outer ends of the brake caliper body (13), and the other ends of the two electromagnetic push rods are propped against the parking push rod (30) and are symmetrical about the central axis of the brake. Two pins (39) respectively penetrate through the parking push rod (30) and the caliper body groove (28) and are symmetrically arranged around the central axis of the brake. The pin springs (40) are respectively sleeved on the pins (39), one end of each pin spring is propped against the inner wall of the clamp body (13), and the other end of each pin spring is propped against the large ring (39-1) at the lower part of each pin (39). The parking pressure lever (27) and the parking energy storage spring (29) are sleeved on the inner bulge (41) of the clamp body (13), and the two clamping grooves (34) are opened on the inner bulge (41) of the clamp body (13).
The speed reduction and torque increase mechanism (1) comprises a primary sun gear (3), a primary planet gear (24), a primary gear ring (2), a primary planet carrier (23), a secondary sun gear (5), a secondary planet gear (22), a secondary gear ring (4) and a secondary planet carrier (21). The primary sun gear (3) is fixed on the rotating shaft (25), and the three primary planet gears (24) have equal included angles between every two and are arranged on the primary planet carrier (23), so that the primary sun gear can rotate and can also rotate around the primary gear ring (2); the included angle between two liang of three secondary planet wheel (22) equals and installs on secondary planet carrier (21), not only can the rotation also can have enough to meet the need along secondary ring gear (4), and secondary sun gear (5) are then fixed on one-level planet carrier (23), and one-level ring gear (2) and secondary ring gear (4) direct processing are on pincers body (13) inner wall.
The motion conversion mechanism comprises a traveling ball screw mechanism (6), a rotating connecting rod (8) and a rotating connecting rod seat (9). The traveling crane ball screw mechanism (6) comprises a traveling crane ball screw (6-1) and a traveling crane screw nut (6-2). The traveling crane ball screw (6-1) and the tail end of the secondary planet carrier (21) are welded together and are concentric with the central shaft of the secondary planet carrier, the traveling crane screw nut (6-2) is connected with the traveling crane ball screw (6-1) screw pair, and the rotating connecting rod (8) and the rotating connecting rod seat (9) are linked by the rotating pair.
The automatic clearance adjusting mechanism comprises a transmission bolt (18), a return spring, a two-jaw rotating wheel (19), a three-jaw rotating wheel (20), a chain wheel (7) and a chain (26). One end of a return spring (10) is propped against the inner wall of the clamp body (13), and the other end of the return spring is propped against the inside of the rotating connecting rod seat (9), so that the rotating connecting rod (8) and the rotating connecting rod seat (9) drive the two pistons (16) to return through a transmission bolt (18). Two-jaw rotating wheels (19) are respectively fixed on two sides of the lower end of a rotating connecting rod (8), two three-jaw rotating wheels (20) are connected with two transmission bolts (18) through splines, two chain wheels (7) are respectively installed at the left end parts of the two transmission bolts (18) through profile combination, a chain (26) is sleeved on the two chain wheels (7), and the two-jaw rotating wheels (19) and the three-jaw rotating wheels (20) are meshed through gear teeth and a certain gap exists between the meshed teeth.
Furthermore, the centers of the revolute pairs of the rotary connecting rod (8) and the rotary connecting rod seat (9) and the center of the rotating shaft (25) have a certain distance in the vertical direction. In addition, the assembly of the rotating connecting rod (8) and the rotating connecting rod seat (9) has a larger transmission ratio, so that the force increasing effect can be realized, the structural size of the brake can be reduced, and the cost can be saved.
Furthermore, the clearance between the meshing teeth of the two-jaw rotating wheel (19) and the three-jaw rotating wheel (20) is used for ensuring that the brake can automatically adjust and maintain a fixed brake clearance through the clearance when the brake friction plate (15) is worn.
Furthermore, two transmission bolts (18) are arranged inside two sides of the outer end of the rotating connecting rod seat (9) and are connected with the rotating connecting rod seat through threads.
Further, the chain (26) is used for realizing synchronous rotation of the two chain wheels (7) so as to ensure that the abrasion compensation amount of the two pistons (16) is the same when the clearance is adjusted.
The invention has the beneficial effects that:
according to the electromechanical brake with the parking function, the two-stage planetary gear reducer is used as a speed reduction and torque increase mechanism, so that the radial size of the electromechanical brake can be effectively reduced. Meanwhile, the transmission of the planetary gear train has the advantages of large transmission ratio and high efficiency, and can achieve better speed reduction and torque increase effects; the motion conversion mechanism adopts a serial connection mode of a traveling ball screw mechanism, a rotating connecting rod and a rotating connecting rod seat. The ball screw mechanism has the advantages of high transmission efficiency, stable motion, high precision, high durability and the like. The rotating connecting rod and the rotating connecting rod seat assembly has larger transmission ratio, can realize the boosting effect and is beneficial to reducing the overall structural size of the brake. Two transmission bolts in the automatic clearance adjusting mechanism are meshed with chain wheels on the chain by the aid of chains to realize motion synchronization, so that the abrasion compensation quantity of the two pistons is the same during clearance adjustment. The pistons at the tail ends of the two transmission bolts simultaneously push the brake block to press the brake disc, so that the contact area of the brake block and the brake block is increased, the abrasion of a brake friction plate is reduced, and the brake disc is stressed uniformly. In addition, an electromagnetic push rod operation mode is adopted in the parking brake mechanism, a traditional manual brake central brake is omitted, the operation is light, the response is sensitive and quick, and the parking brake function can be well realized. In conclusion, the electromechanical brake with the parking function not only can realize automatic adjustment of service braking, parking braking and braking clearance, but also can effectively solve the problems of uniform braking force distribution, low braking reliability, slow braking response and the like of the conventional electromechanical brake.
The clamp body groove (28) has the function of ensuring the axial movement of the pin (39) under the pressure of the parking pressure rod (27). The electromagnetic push rod (37) has the function that after the power switch (36) of the line (32) is switched on, the electromagnetic push rod pushes the parking push rod (30) outwards to pull the pin (39) out of the clamping groove (34). The adopted torque motor (35) is a brushless direct current torque motor, and has the advantages of large starting torque, strong overload capacity, convenient speed regulation, stable operation, low noise, reliable work and the like. The tension spring (31) is used for preventing the pin (39) from being pulled up when the parking push rod (30) does not need the parking brake due to brake vibration and other reasons. The pin spring (40) is used for storing energy and giving a downward acting force to the pin (39), and the acting force enables the pin (39) to quickly and accurately enter the clamping groove (34) when moving to the position of the clamping groove (34). The parking energy storage spring (29) is used for storing energy generated by the parking pressure rod (27) compressing the parking energy storage spring (29) and releasing the stored energy after the pin (39) is pulled out, so that the parking lead screw nut (38-2) is pushed through the parking pressure rod (27), and the parking ball lead screw (38-1) is driven to rotate while the parking lead screw nut (38-2) moves.
Drawings
Fig. 1 is a schematic front view of the overall structure of the electromechanical brake.
Fig. 2 is a schematic structural front view of a service brake of the electromechanical brake.
FIG. 3 is a schematic front view of an electromechanical brake park brake mechanism.
FIG. 4 is a side view of the electromechanical brake service brake.
Fig. 5 is a schematic structural view of a ball screw mechanism of the traveling crane.
FIG. 6 is a schematic structural view of a parking ball screw mechanism
Fig. 7 is a structural schematic diagram of the parking push rod.
Fig. 8 is a schematic top view of the rotary connecting rod seat.
Fig. 9 is a front view structural diagram of a primary planet carrier.
Fig. 10 is a schematic top view of a first-stage planetary carrier.
FIG. 11 is a schematic view of a two-jaw wheel.
FIG. 12 is a schematic view of a three-jaw wheel.
FIG. 13 is a schematic view of a sprocket construction.
Fig. 14 is a partial schematic view of the electromechanical brake structure.
Fig. 15 is an enlarged view of the structure of the pin.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
Referring to fig. 1 to 15, the electromechanical brake with parking function of the present invention includes two parts, namely a parking brake mechanism and a service brake. The service brake comprises a speed reduction and torque increase mechanism (1), a motion conversion mechanism, an automatic clearance adjusting mechanism, a caliper body (13), a brake block (11), a brake friction plate (15), a brake disc (12), a return spring (10) and the like. Wherein the two brake blocks (11) are arranged in the caliper body (13), the brake block (11-1) can axially move relative to the caliper body (13), and the brake block (11-2) is directly fixed on the caliper body (13). The brake friction plates (15) are respectively attached to the two brake blocks (11), the brake disc (12) is fixed on an automobile hub, the base (14) is fixed on an automobile chassis, and the caliper body (13) can axially move relative to the base (14). The caliper body is used for protecting the internal structure of the electronic mechanical brake and preventing substances such as external dust and the like from entering the brake to influence the braking performance and the service life of the brake.
The parking brake mechanism comprises a torque motor (35), a spline (33), a tension spring (31), an electromagnetic push rod (37), a power switch (36), a circuit (32), a parking energy storage spring (29), a pin (39), a pin spring (40), a parking ball screw mechanism (38), a parking pressure lever (27), a parking push rod (30) and a clamping groove (34). One end of each of the upper tensioning spring (31) and the lower tensioning spring (31) is fixed at the left end of the brake caliper body (13), and the other end of each of the upper tensioning spring and the lower tensioning spring is connected with the parking push rod (30). One ends of the two electromagnetic push rods (37) are respectively fixed at the outer ends of the brake caliper body (13), and the other ends of the two electromagnetic push rods are propped against the parking push rod (30) and are symmetrical about the central axis of the brake. Two pins (39) respectively penetrate through the parking push rod (30) and the caliper body groove (28) and are symmetrically arranged around the central axis of the brake. The pin springs (40) are respectively sleeved on the pins (39), one end of each pin spring is propped against the inner wall of the clamp body (13), and the other end of each pin spring is propped against the large ring (39-1) at the lower part of each pin (39). The parking pressure lever (27) and the parking energy storage spring (29) are sleeved on the inner bulge (41) of the clamp body (13), and the two clamping grooves (34) are opened on the inner bulge (41) of the clamp body (13).
During energy storage, the torque motor (35) drives the parking ball screw (38-1) to reversely rotate through the rotating shaft (25) to push the parking screw nut (38-2), and the parking screw nut (38-2) pushes the parking pressure rod (27) to compress the parking energy storage spring (29); when the pin (39) moves to the position of the clamping groove (34) along the clamp body groove (28) under the pushing of the parking pressing rod (27), the pin spring (40) presses the pin (39) into the clamping groove (34) to complete energy storage.
When the parking ball screw is released, the power switch (36) is closed, the electromagnetic push rod (37) pushes the parking push rod (30) to pull out the pin (39) from the clamping groove (34), then the parking energy storage spring (29) pushes the parking pressure rod (27) to move right, and the parking pressure rod (27) moves right to push the parking screw nut (38-2) to drive the parking ball screw (38-1) to rotate forwards.
The speed reduction and torque increase mechanism (1) comprises a primary sun gear (3), a primary planet gear (24), a primary gear ring (2), a primary planet carrier (23), a secondary sun gear (5), a secondary planet gear (22), a secondary gear ring (4) and a secondary planet carrier (21). The primary sun gear (3) is fixed on the rotating shaft (25), and included angles between every two three primary planet gears (24) are equal and are arranged on the primary planet carrier (23), so that the planetary gear set can rotate and can also rotate along the primary gear ring (2). The included angles between every two three secondary planet gears (22) are equal and are arranged on a secondary planet carrier (21), and the three secondary planet gears not only can rotate but also can rotate around the secondary gear ring (4). The secondary sun gear (5) is fixed on the primary planet carrier (23). The primary gear ring (2) and the secondary gear ring (4) are directly machined on the inner wall of the clamp body (13).
The torque motor (35) drives the primary sun gear (3) to rotate through the rotating shaft (25), the primary sun gear (3) drives the primary planet gear (24) to rotate along the primary gear ring (2) through gear transmission, the primary planet gear (24) drives the primary planet carrier (23) to rotate to transmit motion to the secondary sun gear (5), and the secondary sun gear (5) drives the secondary planet gear (22) to transmit motion to the secondary planet carrier (21) along the secondary gear ring (4) through gear transmission; the two-stage planet carrier (21) drives the motion conversion mechanism to convert the rotary motion into the axial movement of the two pistons (16).
The motion conversion mechanism comprises a traveling ball screw mechanism (6), a rotating connecting rod (8) and a rotating connecting rod seat (9). The traveling crane ball screw mechanism comprises a traveling crane ball screw (6-1) and a traveling crane screw nut (6-2). The traveling crane ball screw (6-1) and the tail end of the secondary planet carrier (21) are welded together and are concentric with the central shaft of the secondary planet carrier, the traveling crane screw nut (6-2) is connected with the traveling crane ball screw (6-1) screw pair, and the rotating connecting rod (8) is connected with the rotating connecting rod seat (9) by the rotating pair.
When the automobile is braked in a running process, the torque motor (35) drives the running ball screw (6-1) through the secondary planet carrier (21) in the speed reduction and torque increase mechanism (1) so as to drive the running screw nut (6-2) to move rightwards, the running screw nut (6-2) moves rightwards to push the rotating connecting rod (8) to rotate, and the rotating connecting rod (8) rotates and simultaneously drives the rotating connecting rod seat (9) to move rightwards to push the two pistons (16) to drive the brake block (11) and the brake friction plate (15) on the brake block to press the brake disc (12).
The automatic clearance adjusting mechanism comprises a transmission bolt (18), a two-jaw rotating wheel (19), a three-jaw rotating wheel (20), a chain wheel (7) and a chain (26). Two-jaw rotating wheels (19) are respectively fixed on two sides of the lower end of the rotating connecting rod (8), two three-jaw rotating wheels (20) are connected with two transmission bolts (18) through splines, two chain wheels (7) are respectively installed at the left end parts of the two transmission bolts (18) through profile combination, and a chain (26) is sleeved on the two chain wheels (7). The two-jaw rotating wheel (19) is meshed with the three-jaw rotating wheel (20) through gear teeth, and a certain gap exists between the meshed gear teeth.
When the gap is automatically adjusted, the torque motor (35) drives the driving ball screw mechanism (6) through the speed reduction and torque increase mechanism (1), a driving screw nut (6-2) in the driving ball screw mechanism (6) pushes the rotating connecting rod (8) to drive the two-jaw rotating wheels (19) on two sides to rotate together, the two-jaw rotating wheels (19) drive the two three-jaw rotating wheels (20) through gear transmission to drive the two transmission bolts (18) to rotate positively, the transmission bolts (18) rotate and move rightwards relative to the rotating connecting rod seat (9), and when the transmission bolts (18) move rightwards, the two pistons (16) on the transmission bolts are also driven to move rightwards to eliminate the abrasion loss of the brake friction plates (15).
The detailed working principle of the electromechanical brake of the invention is as follows:
during service braking: a driver sends a braking instruction, a forward voltage is applied to the torque motor (35), the torque motor (35) rotates rapidly, and the spline (33) drives the rotating shaft (25) to drive the first-stage sun gear (3) in the speed reduction and torque increase mechanism (1) to rotate; the primary sun gear (3) drives three primary planet gears (24) to rotate along the primary gear ring (2) through gear transmission, the primary planet gears (24) rotate to drive a primary planet carrier (23) to transmit motion to the secondary sun gear (5), and the secondary sun gear (5) transmits the motion to the secondary planet carrier (21) through a secondary planet gear (22) along the secondary gear ring (4); the secondary planet carrier (21) drives the traveling ball screw mechanism (6) to convert the rotary motion into axial movement so as to push the rotary connecting rod (8) to rotate, the rotary connecting rod (8) also pushes the rotary connecting rod seat (9) to move right while rotating, and the rotary connecting rod seat (9) moves right to compress the return spring (10) and push the piston (16) on two transmission bolts (18) in threaded connection with the return spring to move right; the piston (16) moves to the right and pushes the brake block (11-1) to press on the brake disc (12) through the friction plate (15-1) on the piston, the brake disc (12) gives a left reaction force to the whole caliper body (13) through the piston (16), and the reaction force pushes the caliper body (13) to move left along the two guide pins (17) so as to drive the brake block (11-2) on the caliper body to press on the brake disc (12) through the friction plate (15-2) on the caliper body, until the maximum braking force is reached to finish braking.
When the service brake is released, a driver sends a brake releasing instruction to apply reverse voltage to the torque motor (35), the torque motor (35) rapidly rotates reversely and drives the rotating shaft (25) through the spline (33) to drive the first-stage sun gear (3) in the speed reducing and torque increasing mechanism (1) to rotate reversely; the primary sun gear (3) drives three primary planet gears (24) to rotate reversely along the primary gear ring (2) through gear transmission, the primary planet gears (24) rotate to drive a primary planet carrier (23) to transmit motion to the secondary sun gear (5), and the secondary sun gear (5) transmits the motion to a secondary planet carrier (21) through a secondary planet gear (22) along the secondary gear ring (4); the secondary planet carrier (21) drives the traveling ball screw mechanism (6) to convert the rotary motion into axial reverse movement so as to release the pressure on the rotary connecting rod (8), the rotary connecting rod (8) and the rotary connecting rod seat (9) return under the action of a return spring, and the rotary connecting rod seat (9) moves leftwards to return and drives pistons (16) on two transmission bolts (18) in threaded connection with the rotary connecting rod seat to quickly release a brake disc (12) to complete the release process.
The parking brake is divided into an energy storage process and a parking process. During energy storage, the torque motor (35) reversely rotates to push the parking screw nut (38-2) to move left through the parking ball screw (38-1), the parking screw nut (38-2) moves left and meanwhile pushes the parking pressure lever (27) to compress the parking energy storage spring (29), and when the pin (39) moves to the position of the clamping groove (34) along the clamp body groove (28) under the pushing of the parking pressure lever (27), the pin spring (40) presses the pin (39) into the clamping groove (34) to complete energy storage.
When the parking device is parked, a power switch (36) of a circuit (32) is closed, an electromagnetic push rod (37) pushes a parking push rod (30) to pull out a pin (39) from a clamping groove (34), then a parking energy storage spring (29) pushes a parking pressure rod (27) to move right, and the parking pressure rod (27) moves right to push a parking lead screw nut (38-2) to drive a parking ball lead screw (38-1) to rotate forwards. Then the parking ball screw (38-2) drives the deceleration moment-increasing mechanism (1) and the motion conversion mechanism through the rotating shaft (25) and pushes the brake block (11) to press the brake disc (12) through the brake friction plate (15) on the brake block to complete parking braking.
When the clearance is adjusted, the torque motor (35) drives the driving ball screw mechanism (6) through the speed reduction and torque increase mechanism (1), a driving screw nut (6-2) in the driving ball screw mechanism (6) pushes the rotating connecting rod (8) to rotate, the rotating connecting rod (8) drives the two-jaw rotating wheels (19) on two sides to rotate together, the two-jaw rotating wheels (19) drive the two three-jaw rotating wheels (20) to drive the two transmission bolts (18) to rotate positively through gear transmission, the transmission bolts (18) rotate and move rightwards relative to the rotating connecting rod seat (9), and when the transmission bolts (18) move rightwards, the two pistons (16) on the transmission bolts are also driven to move rightwards to eliminate the abrasion loss of the brake friction plates (15). When the brake friction plate (15) is not abraded, a certain meshing gap is formed between meshing teeth of the two-jaw rotating wheel (19) and the three-jaw rotating wheel (20), so that the rotation quantity of the two-jaw rotating wheel (19) is small, the meshing gap is just eliminated, and the three-jaw rotating wheel (20) cannot be driven to rotate.
Claims (8)
1. The electronic mechanical brake with the parking function is characterized by comprising a parking brake mechanism and a service brake, wherein the parking brake mechanism and the service brake are connected through a rotating shaft (25); the service brake comprises a speed reduction and torque increase mechanism (1), a motion conversion mechanism, an automatic clearance adjusting mechanism, a caliper body (13), a brake block (11), a brake friction plate (15) and a brake disc (12); wherein the two brake blocks (11) are arranged in the caliper body (13), the brake block (11-1) can axially move relative to the caliper body (13), and the brake block (11-2) is directly fixed on the caliper body (13); the brake friction plates (15) are respectively attached to the two brake blocks (11), the brake disc (12) is fixed on an automobile hub, the base (14) is installed on an automobile chassis, and the caliper body (13) can axially move relative to the base (14); when the automobile brake is in service braking, the torque motor (35) drives the motion conversion mechanism through the speed reduction and torque increase mechanism (1), the motion conversion mechanism drives the automatic clearance adjustment mechanism to push the brake block (11), and the brake block (11) compresses the brake disc (12) through the brake friction plate (15) on the brake block to complete service braking;
the parking brake mechanism comprises a torque motor (35), a fixed rotating shaft (42), a clamp body groove (28), a tension spring (31), an electromagnetic push rod (37), a parking energy storage spring (29), a pin (39), a pin spring (40), a parking ball screw mechanism (38), a parking pressure rod (27), a parking push rod (30) and a clamping groove (34); the parking ball screw mechanism (38) comprises a parking ball screw (38-1) and a parking screw nut (38-2); the parking ball screw (38-1) is directly processed on the rotating shaft (25), a parking screw nut (38-2) is connected with the parking ball screw (38-1) through a screw pair, the left end of the parking ball screw abuts against the inner side of the left end of a parking pressure lever (27), a torque motor (35) is connected with the parking ball screw (38-1) through a spline (33), one end of a parking push rod (30) is connected with a pulling spring (31), the other end of the parking push rod is connected with a rotating pair of a fixed rotating shaft (42), the inner side of the middle of the parking push rod is directly abutted against an electromagnetic push rod (37), the fixed rotating shaft (42) is fixed on a caliper body (13), one end of each of an upper tensioning spring (31) and a lower tensioning spring (31) is fixed at the left end part of the caliper body (13), the other end of the parking push rod (30) is connected, one end of each of the two electromagnetic push rods (37) is respectively fixed at the outer end of the caliper body (13), the other end of the parking brake is supported on a parking push rod (30) and is symmetrical about a brake central axis, two pins (39) respectively penetrate through the parking push rod (30) and a clamp body groove (28) and are symmetrically arranged about the brake central axis, pin springs (40) are respectively sleeved on the pins (39), one end of each pin is supported on the inner wall of the clamp body (13), the other end of each pin is supported on a large ring (39-1) at the lower part of the pin (39), a parking pressure rod (27) and a parking energy storage spring (29) are sleeved on a bulge (41) in the clamp body (13), and two clamping grooves (34) are opened on the bulge (41) in the clamp body (13).
2. The electromechanical brake with parking function according to claim 1, characterized in that said deceleration and torque-increasing mechanism (1) comprises a primary sun gear (3), a primary planet gear (24), a primary ring gear (2), a primary planet carrier (23), a secondary sun gear (5), a secondary planet gear (22), a secondary ring gear (4) and a secondary planet carrier (21); the primary sun gear (3) is fixed on the rotating shaft (25), and the three primary planet gears (24) have equal included angles between every two and are arranged on the primary planet carrier (23), so that the primary sun gear can rotate and can also rotate around the primary gear ring (2); the included angle between two liang of three secondary planet wheel (22) equals and installs on secondary planet carrier (21), not only can the rotation also can have enough to meet the need along secondary ring gear (4), and secondary sun gear (5) are then fixed on one-level planet carrier (23), and one-level ring gear (2) and secondary ring gear (4) direct processing are on pincers body (13) inner wall.
3. Electromechanical brake with parking function according to claim 1, characterized in that said motion conversion mechanism comprises a travelling ball screw mechanism (6), a rotating link (8), a rotating link seat (9); the traveling ball screw mechanism (6) comprises a traveling ball screw (6-1) and a traveling screw nut (6-2), the traveling ball screw (6-1) and the tail end of the secondary planet carrier (21) are welded together and are concentric with the central shaft of the secondary planet carrier, the traveling screw nut (6-2) is connected with a screw pair of the traveling ball screw (6-1), and the rotating connecting rod (8) and the rotating connecting rod seat (9) are connected by virtue of the rotating pair.
4. The electromechanical brake with parking function according to claim 1, characterized in that said automatic clearance adjustment mechanism comprises a transmission bolt (18), a return spring (10), a two-jaw wheel (19), a three-jaw wheel (20), a sprocket (7), a chain (26); one end of a return spring (10) is propped against the inner wall of the clamp body (13), and the other end of the return spring is propped against the inside of the rotating connecting rod seat (9), so that the rotating connecting rod (8) and the rotating connecting rod seat (9) drive the two pistons (16) to return through a transmission bolt (18); two-jaw rotating wheels (19) are respectively fixed on two sides of the lower end of a rotating connecting rod (8), two three-jaw rotating wheels (20) are connected with two transmission bolts (18) through splines, two chain wheels (7) are respectively installed at the left end parts of the two transmission bolts (18) through profile combination, a chain (26) is sleeved on the two chain wheels (7), and the two-jaw rotating wheels (19) and the three-jaw rotating wheels (20) are meshed through gear teeth and a certain gap exists between the meshed teeth.
5. The electromechanical brake with parking function according to claim 3, characterized in that the centers of the revolute pairs of the rotary link (8) and the rotary link seat (9) are at a certain distance from the center of the rotary shaft (25) in the vertical direction.
6. The electromechanical brake with parking function of claim 4, characterized in that the gap between the meshing teeth of the two-jaw rotating wheel (19) and the three-jaw rotating wheel (20) is used to ensure that the brake can maintain a fixed brake gap through automatic gap adjustment when the brake friction plate (15) is worn.
7. The electromechanical brake with parking function according to claim 4, characterized in that said two driving bolts (18) are mounted inside the two sides of the outer end of the rotating connecting rod seat (9) and connected with it by screw thread.
8. Electromechanical brake with parking function, according to claim 4, characterized by the fact that the chain (26) is used to achieve a synchronous rotation of the two sprockets (7) to guarantee the same amount of wear compensation of the two pistons (16) at the clearance adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111392833.3A CN114165537A (en) | 2021-11-23 | 2021-11-23 | Electromechanical brake with parking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111392833.3A CN114165537A (en) | 2021-11-23 | 2021-11-23 | Electromechanical brake with parking function |
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| Publication Number | Publication Date |
|---|---|
| CN114165537A true CN114165537A (en) | 2022-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111392833.3A Pending CN114165537A (en) | 2021-11-23 | 2021-11-23 | Electromechanical brake with parking function |
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| CN (1) | CN114165537A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116080616A (en) * | 2023-02-22 | 2023-05-09 | 徐州淮海新能源汽车有限公司 | New energy automobile parking brake |
-
2021
- 2021-11-23 CN CN202111392833.3A patent/CN114165537A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116080616A (en) * | 2023-02-22 | 2023-05-09 | 徐州淮海新能源汽车有限公司 | New energy automobile parking brake |
| CN116080616B (en) * | 2023-02-22 | 2023-09-22 | 徐州淮海新能源汽车有限公司 | New energy automobile parking brake |
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