CN221851889U - Electromechanical brake - Google Patents

Abstract

The utility model relates to the field of vehicle technology, and specifically discloses an electronic mechanical brake device, which includes a clamping assembly, a driving assembly and a power conversion assembly. The power conversion assembly is arranged between the driving assembly and the second brake block. The power conversion assembly includes at least two planetary roller screw pairs, and the planetary roller screw pair includes a screw, a screw sleeve arranged on the screw, and a planetary roller located between the screw and the screw sleeve. The driving assembly drives at least two screws to rotate synchronously, so that at least two screw sleeves drive the second brake block of the clamping assembly to slide in a direction close to or away from the first brake block. The planetary roller screw pair can withstand a large load, so it can provide sufficient braking force for heavy vehicles. By driving the brake block of the clamping assembly to slide by at least two planetary roller screw pairs, the force and wear of the brake block of the clamping assembly can be made more uniform.

Description

Electromechanical brake

Technical Field

The utility model relates to the technical field of vehicles, in particular to an electronic mechanical braking device.

Background Art

As an important part of the car, the automobile braking system directly affects the safety performance of the car. With the development and transformation of automobile electrification and intelligence, modern automobile braking technology has also developed from traditional pneumatic or hydraulic to electric. Therefore, automobile electronic mechanical braking technology is becoming the research focus of major automobile manufacturers.

Existing automotive electromechanical brake devices usually use an electric motor as the power, reduce the speed of the motor through a reducer to increase the torque, and then convert the rotational motion output by the reducer into linear motion through a power conversion element, and finally drive two brake pads to clamp the brake disc to achieve vehicle braking.

Existing power conversion parts are usually gear rack structures, ordinary screw structures or ball screw structures. Although the above structures can convert rotational motion into linear motion, there is a problem of stress concentration in the conversion process. It cannot bear a large braking force. Therefore, it cannot provide sufficient braking force for heavy vehicles, which affects the safety performance of vehicle driving.

Therefore, an electromechanical brake device is urgently needed to solve the above problems.

Utility Model Content

The purpose of the utility model is to provide an electronic mechanical braking device to solve the problem that the power conversion component in the related technology is usually a gear rack structure or a common screw structure or a ball screw structure, and there is a stress concentration problem in the conversion process. It cannot bear a large braking force, so it cannot provide sufficient braking force for heavy vehicles, which affects the safety performance of vehicle driving.

The utility model provides an electronic mechanical braking device, which comprises:

The clamping assembly includes a pressure plate, a first brake block and a second brake block, wherein the first brake block is arranged on the pressure plate, and the second brake block is slidably arranged on the pressure plate, and the sliding direction of the second brake block is opposite to that of the first brake block;

Drive components;

A power conversion component, which is arranged between the drive component and the second brake block, and the power conversion component includes at least two planetary roller screw pairs, and the planetary roller screw pairs include a screw, a sleeve mounted on the screw, and a plurality of planetary rollers arranged between the screw and the sleeve. The drive component drives at least two of the screws to rotate synchronously so that at least two of the sleeves drive the second brake block to slide in a direction close to or away from the first brake block.

As a preferred technical solution of the electronic mechanical brake device, the planetary roller includes an intermediate shaft and a threaded portion arranged on the intermediate shaft, and the planetary roller is provided in multiple types, and the threaded portion on each planetary roller has a different position relative to the intermediate shaft along the axial direction of the intermediate shaft;

One of the plurality of planetary rollers is disposed between the lead screw and the threaded sleeve.

As a preferred technical solution of the electronic mechanical braking device, the power conversion assembly also includes a transmission gear set arranged between the drive assembly and the planetary roller screw pair, and the drive assembly is connected to the screw through the transmission gear set.

As a preferred technical solution for the electronic mechanical brake device, the power conversion component further comprises a fixed bracket, the fixed bracket is relatively fixed to the housing of the driving component, the fixed bracket is provided with a limiting sleeve, and the screw sleeve is inserted into the limiting sleeve.

As a preferred technical solution of the electronic mechanical brake device, the transmission gear set includes a driving wheel, an idler wheel and a driven wheel, the driving assembly drives the driving wheel to rotate around the axis of the driving wheel, the driving wheel is meshed with the idler wheel, the idler wheel is meshed with the driven wheel, the fixed bracket is provided with a sliding hole along the axial direction of the idler wheel, the driving assembly is provided with a limiting hole, and the sliding hole and the limiting hole are coaxially opposite;

One end of the first support shaft of the idler wheel is passed through the limiting hole and is relatively fixed to the driving assembly, and the other end is passed through the sliding hole and is relatively fixed to the fixing bracket.

As a preferred technical solution of the electronic mechanical brake device, the power conversion component also includes a push plate, the screw sleeve is fixedly connected to one side of the push plate, and the other side of the push plate facing away from the screw sleeve is detachably connected to the second brake block.

As an optimal technical solution for the electronic mechanical braking device, the drive assembly includes a housing, a driver and a planetary reducer. The housing is fixedly connected to the pressure plate, the driver is fixedly arranged on the housing, the output shaft of the driver drives the sun gear of the planetary reducer to rotate, the ring gear of the planetary reducer is fixedly connected to the housing, and the planetary carrier of the planetary reducer is used to drive the driving wheel to rotate around its axis.

As a preferred technical solution of the electronic mechanical brake device, the second support shaft of the driving wheel is integrally formed with the planet carrier or is detachably arranged.

As a preferred technical solution of the electromechanical brake device, the drive assembly further includes a parking brake, which is fixedly connected to the housing of the driver and can lock the output shaft.

As a preferred technical solution of the electromechanical brake device, along the sliding direction of the second brake block, projections of at least two of the planetary roller screw pairs are evenly arranged on the second brake block.

The beneficial effects of the utility model are:

The utility model provides an electronic mechanical brake device, which comprises a clamping assembly, a driving assembly and a power conversion assembly. The clamping assembly comprises a pressure plate, a first brake block and a second brake block. The first brake block is arranged on the pressure plate, and the second brake block is slidably arranged on the pressure plate, and the sliding direction of the second brake block is opposite to that of the first brake block. The power conversion assembly is arranged between the driving assembly and the second brake block. The power conversion assembly comprises at least two planetary roller screw pairs. The planetary roller screw pairs comprise a screw, a screw sleeve sleeved on the screw, and a plurality of planetary rollers arranged between the screw and the screw sleeve. The driving assembly drives the at least two screws to rotate synchronously, so that the at least two screw sleeves drive the second brake block to slide in a direction close to or away from the first brake block. When the electronic mechanical brake device is working, the driving component drives at least two screws to rotate, and the screw drives the screw sleeve to move along the axis of the screw through multiple planetary rollers, so that the multiple screw sleeves synchronously drive the second brake block to slide in the direction close to the first brake block. When the first brake block and the second brake block clamp the brake disc together, the first brake block and the second brake block generate braking force on the brake disc. When the second brake block slides in the direction away from the brake disc, the braking force generated by the first brake block and the second brake block on the brake disc gradually decreases until it disappears. Since the power conversion component uses a planetary roller screw pair, the load transfer element of the planetary roller screw pair is a threaded roller, which is a line contact. Compared with the point contact of the ball screw, the threaded roller has more contact points, so that the load is quickly released through many contact points, so that it has a higher impact resistance. Therefore, the planetary roller screw pair can withstand a large load and is not easy to produce elastic deformation. Therefore, it can provide sufficient braking force for heavy vehicles and improve the safety performance of vehicle driving.

In addition, the use of a planetary roller screw pair can bear a larger load, and the use of a double-push arrangement makes the force and friction of the clamping assembly more uniform, which is beneficial to improving the braking effect and increasing the service life of the electronic mechanical brake device.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of an electronic mechanical brake device in an embodiment of the present utility model;

Fig. 2 is a cross-sectional view of the A-A position in Fig. 1;

FIG3 is a structural schematic diagram of an electromechanical brake device in an embodiment of the present utility model (excluding a housing, a driver and a parking brake);

FIG4 is a second structural schematic diagram of the electromechanical brake device in an embodiment of the utility model (excluding the housing, the driver and the parking brake);

FIG5 is a cross-sectional view taken along line B-B in FIG4 .

In the figure:

1. Clamping assembly; 11. Pressing plate; 12. First brake block; 13. Second brake block;

2. Drive assembly; 21. Housing; 211. Limiting hole; 22. Driver; 23. Planetary reducer; 231. Sun gear; 232. Ring gear; 233. Planet carrier; 234. Planetary gear; 24. Parking brake;

3. Power conversion assembly; 31. Planetary roller screw pair; 311. Screw; 312. Screw sleeve; 313. Planetary roller; 3131. Intermediate shaft; 3132. Threaded portion; 32. Driving wheel; 321. Second support shaft; 33. Driven wheel; 34. Idle wheel; 341. First support shaft; 35. Fixed bracket; 351. Sliding hole; 352. Limit sleeve; 36. Push plate.

DETAILED DESCRIPTION

The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

As shown in Figures 1 to 5, this embodiment provides an electronic mechanical braking device, which includes a clamping component 1, a driving component 2 and a power conversion component 3. The clamping component 1 includes a pressure plate 11, a first brake block 12 and a second brake block 13. The first brake block 12 is arranged on the pressure plate 11, and the second brake block 13 is slidably arranged on the pressure plate 11, and the sliding direction of the second brake block 13 is opposite to the first brake block 12; the power conversion component 3 is arranged between the driving component 2 and the second brake block 13, and the power conversion component 3 includes at least two planetary roller screw pairs 31, the planetary roller screw pair 31 includes a screw 311, a screw sleeve 312 sleeved on the screw 311 and a plurality of planetary rollers 313 arranged between the screw 311 and the screw sleeve 312, and the driving component 2 drives the at least two screws 311 to rotate synchronously, so that the at least two screw sleeves 312 drive the second brake block 13 to slide in a direction close to or away from the first brake block 12. When the electronic mechanical brake device is working, the driving component 2 drives at least two lead screws 311 to rotate, and the lead screw 311 drives the screw sleeve 312 to move along the axis of the lead screw 311 through multiple planetary rollers 313, so that the multiple screw sleeves 312 synchronously drive the second brake block 13 to slide relative to the pressure plate 11. When the second brake block 13 approaches the first brake block 12, and the second brake block 13 and the first brake block 12 clamp the brake disc, the second brake block 13 and the first brake block 12 generate a braking force on the brake disc. When the second brake block 13 moves away from the first brake block 12, the braking force generated by the second brake block 13 and the first brake block 12 on the brake disc gradually decreases until it disappears. Since the power conversion component 3 uses a planetary roller screw pair 31. The load transfer element of the planetary roller screw pair 31 is a threaded roller, which is a line contact. Compared with the point contact of the ball screw, the threaded roller has more contact points, so that the load is quickly released through many contact points, thereby having a higher impact resistance. Therefore, the planetary roller screw pair 31 can bear a large load and is not prone to elastic deformation, so it can provide sufficient braking force for heavy vehicles and improve the safety performance of vehicle driving.

Optionally, the planetary roller 313 includes an intermediate shaft 3131 and a threaded portion 3132 disposed on the intermediate shaft 3131, and the planetary roller 313 is provided in multiple types, and the threaded portion 3132 on each planetary roller 313 has different positions relative to the intermediate shaft 3131 along the axial direction of the intermediate shaft 3131; one of the multiple planetary rollers 313 is disposed between the lead screw 311 and the screw sleeve 312. In this embodiment, since the first brake block 12 and the second brake block 13 in different vehicle models have different thicknesses and different amounts of wear, and the gaps between the first brake block 12 and the second brake block 13 and the brake disc need to be kept constant, different requirements are placed on the axial travel of the screw sleeve 312. Therefore, by selecting different types of planetary rollers 313, the maximum moving distance of the screw sleeve 312 can be adjusted. Therefore, this arrangement enables the electronic mechanical brake device to be adapted to vehicles of different models.

Optionally, the power conversion assembly 3 further includes a transmission gear set, and the drive assembly 2 is transmission-connected to the lead screw 311 through the transmission gear set. The transmission gear set specifically includes a driving wheel 32 and at least two driven wheels 33. The drive assembly 2 drives the driving wheel 32 to rotate around its axis, and at least two driven wheels 33 are fixedly connected to the coaxial line of at least two lead screws 311 in a one-to-one correspondence, and the driving wheel 32 drives at least two driven wheels 33 to rotate synchronously. In this embodiment, the driving wheel 32 drives at least two driven wheels 33 to rotate synchronously. In other embodiments, at least two driven wheels 33 may be transmission-connected in sequence, and the driving wheel 32 drives one of the driven wheels 33 to rotate.

In addition, the planetary roller screw pair 31 can bear a larger load, and the double-push arrangement makes the force and friction of the clamping assembly 1 more uniform, which is beneficial to improving the braking effect and increasing the service life of the electronic mechanical brake device.

Optionally, the transmission gear set further includes an idler wheel 34, the driving wheel 32 is meshed with the idler wheel 34, and the idler wheel 34 is meshed with at least two driven wheels 33 at the same time. In this embodiment, the main function of the idler wheel 34 is to adjust the spatial arrangement of the electronic mechanical brake device, thereby adapting to the installation space of the vehicle, which is beneficial to the spatial arrangement of the vehicle. Specifically, one or more idler wheels 34 can be provided, wherein multiple idler wheels 34 are meshed in sequence. In other embodiments, the idler wheel 34 can also be used to adjust the speed and torque.

Optionally, the power conversion assembly 3 further includes a fixed bracket 35, the fixed bracket 35 is relatively fixed to the housing 21 of the driving assembly 2, and the fixed bracket 35 is provided with at least two limiting sleeves 352, and at least two screw sleeves 312 are correspondingly inserted into the at least two limiting sleeves 352. In this embodiment, this arrangement can radially limit and support the planetary roller screw pair 31.

Optionally, the fixed bracket 35 is provided with a sliding hole 351 along the axial direction of the idler wheel 34, the driving assembly 2 is provided with a limiting hole 211, and the sliding hole 351 and the limiting hole 211 are coaxially opposite; one end of the first support shaft 341 of the idler wheel 34 is passed through the limiting hole 211 and is relatively fixed to the driving assembly 2, and the other end is passed through the sliding hole 351 and is relatively fixed to the fixed bracket 35. In this embodiment, the two ends of the first support shaft 341 are respectively inserted into the limiting hole 211 and the sliding hole 351, so the fixed bracket 35 and the driving assembly 2 play a role in supporting and limiting the idler wheel 34 on the first support shaft 341.

Optionally, a push plate 36 is further included, at least two screw sleeves 312 are fixedly connected to one side of the push plate 36, and the other side of the push plate 36 away from the screw sleeve 312 is detachably connected to the second brake block 13. In the present embodiment, the screw sleeves 312 of at least two planetary roller screw pairs 31 synchronously drive the push plate 36 to slide relative to the pressure plate 11 to achieve uniform force on the second brake block 13. At least two screw sleeves 312 are fixedly arranged on the push plate 36, and this arrangement can prevent the screw sleeve 312 from rotating. In addition, since the first brake block 12 and the second brake block 13 are both wearing parts, the first brake block 12 and the second brake block 13 need to be replaced regularly, so the other side of the push plate 36 away from the screw sleeve 312 is detachably connected to the second brake block 13.

Optionally, the drive assembly 2 includes a housing 21, a driver 22 and a planetary reducer 23. The housing 21 is fixedly connected to the pressure plate 11, the driver 22 is fixedly arranged on the housing 21, the output shaft of the driver 22 drives the sun gear 231 of the planetary reducer 23 to rotate, the ring gear 232 of the planetary reducer 23 is fixedly connected to the housing 21, and the planet carrier 233 of the planetary reducer 23 is used to drive the driving wheel 32 to rotate around its axis. In this embodiment, a plurality of planetary gears 234 are arranged between the ring gear 232 and the sun gear 231. When the sun gear 231 rotates, the plurality of planetary gears 234 rotate around the axis of the sun gear 231, thereby driving the rotation of the planet carrier 233 connected to the planetary gears 234. The planetary reducer 23 has the effect of reducing speed and increasing torque.

Specifically, the driver 22 is a motor.

Optionally, the second support shaft 321 of the driving wheel 32 and the planetary frame 233 are integrally formed or detachably formed. In this embodiment, the second support shaft 321 and the planetary frame 233 are integrally formed to improve the coaxiality of the second support shaft 321 and the planetary frame 233 on the one hand; on the other hand, the connection strength between the second support shaft 321 and the planetary frame 233 can be improved; in addition, the above arrangement can also improve the overall assembly efficiency of the electronic mechanical brake device. In other embodiments, the second support shaft 321 of the driving wheel 32 and the planetary frame 233 are detachably formed.

Optionally, the housing 21 is fixed to the pressing plate 11 by bolts. In this embodiment, this arrangement facilitates assembly and maintenance of the clamping assembly.

In other embodiments, the housing 21 and the pressure plate 11 are integrally formed. This arrangement can improve the connection strength between the housing 21 and the pressure plate 11, and can prevent cracks or breaks in the connection between the housing 21 and the pressure plate 11 when a large braking force is provided to the brake disc. This arrangement can improve the working stability of the electronic mechanical brake device.

Optionally, the drive assembly 2 further includes a parking brake 24, which is fixedly connected to the housing of the driver 22, and the parking brake 24 can lock the output shaft. In this embodiment, when the vehicle provided with the electromechanical brake device needs to be parked, the driver 22 works, thereby causing the second brake block 13 and the first brake block 12 to clamp the brake disc, and at this time, the parking brake 24 locks the output shaft of the driver 22, thereby achieving parking of the vehicle.

Optionally, along the sliding direction of the second brake block 13, the projections of at least two planetary roller screw pairs 31 are evenly arranged on the second brake block 13. In this embodiment, this arrangement can ensure the uniformity of the force on the second brake block 13, thereby making the force and wear of the second brake block 13 and the first brake block 12 more uniform, which is conducive to improving the braking effect and increasing the service life of the electronic mechanical brake device.

Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (10)

1. Electromechanical brake device, comprising: The clamping assembly (1) comprises a pressure plate (11), a first brake block (12) and a second brake block (13), wherein the first brake block (12) is arranged on the pressure plate (11), and the second brake block (13) is slidably arranged on the pressure plate (11), and the sliding direction of the second brake block (13) is opposite to that of the first brake block (12); A drive assembly (2); The invention is characterized in that it also includes a power conversion component (3), wherein the power conversion component (3) is arranged between the driving component (2) and the second brake block (13), the power conversion component (3) includes at least two planetary roller screw pairs (31), the planetary roller screw pairs (31) include a screw (311), a screw sleeve (312) sleeved on the screw (311), and a planetary roller (313) arranged between the screw (311) and the screw sleeve (312), and the driving component (2) drives at least two of the screws (311) to rotate synchronously, so that at least two of the screw sleeves (312) drive the second brake block (13) to slide in a direction close to or away from the first brake block (12). 2. The electronic mechanical brake device according to claim 1, characterized in that the planetary roller (313) comprises an intermediate shaft (3131) and a threaded portion (3132) arranged on the intermediate shaft (3131), and the planetary roller (313) is provided with multiple types, and the position of the threaded portion (3132) on each planetary roller (313) along the axial direction of the intermediate shaft (3131) relative to the intermediate shaft (3131) is different; One of the plurality of planetary rollers (313) is arranged between the lead screw (311) and the threaded sleeve (312). 3. The electronic mechanical braking device according to claim 2 is characterized in that the power conversion component (3) also includes a transmission gear set arranged between the drive component (2) and the planetary roller screw pair (31), and the drive component (2) is connected to the screw (311) through the transmission gear set. 4. The electronic mechanical braking device according to claim 3 is characterized in that the power conversion component (3) also includes a fixed bracket (35), the fixed bracket (35) is relatively fixed to the housing (21) of the driving component (2), the fixed bracket (35) is provided with a limiting sleeve (352), and the screw sleeve (312) is inserted into the limiting sleeve (352). 5. The electronic mechanical brake device according to claim 4, characterized in that the transmission gear set comprises a driving wheel (32), an idler wheel (34) and a driven wheel (33), the driving assembly (2) drives the driving wheel (32) to rotate around the axis of the driving wheel (32), the driving wheel (32) is meshed with the idler wheel (34), the idler wheel (34) is meshed with the driven wheel (33), the fixed bracket (35) is provided with a sliding hole (351) along the axial direction of the idler wheel (34), the driving assembly (2) is provided with a limiting hole (211), and the sliding hole (351) and the limiting hole (211) are coaxially opposite to each other; One end of the first support shaft (341) of the idler wheel (34) passes through the limiting hole (211) and is relatively fixed to the driving assembly (2), and the other end passes through the sliding hole (351) and is relatively fixed to the fixing bracket (35). 6. The electronic mechanical braking device according to claim 5 is characterized in that the power conversion component (3) also includes a push plate (36), the screw sleeve (312) is fixedly connected to one side of the push plate (36), and the other side of the push plate (36) facing away from the screw sleeve (312) is detachably connected to the second brake block (13). 7. The electronic mechanical braking device according to claim 5 is characterized in that the driving assembly (2) comprises a housing (21), a driver (22) and a planetary reducer (23), the housing (21) is fixedly connected to the pressure plate (11), the driver (22) is fixedly arranged on the housing (21), the output shaft of the driver (22) drives the sun gear (231) of the planetary reducer (23) to rotate, the ring gear (232) of the planetary reducer (23) is fixedly connected to the housing (21), and the planetary carrier (233) of the planetary reducer (23) is used to drive the driving wheel (32) to rotate around its axis. 8. The electronic mechanical brake device according to claim 7, characterized in that the second support shaft (321) of the driving wheel (32) and the planet carrier (233) are integrally formed or detachably arranged. 9. The electronic mechanical braking device according to claim 7 is characterized in that the drive assembly (2) further comprises a parking brake (24), the parking brake (24) is fixedly connected to the housing of the driver (22), and the parking brake (24) can lock the output shaft. 10. The electronic mechanical braking device according to any one of claims 1 to 9, characterized in that, along the sliding direction of the second brake block (13), projections of at least two of the planetary roller screw pairs (31) are evenly arranged on the second brake block (13).