CN113819168B

CN113819168B - Electromechanical parking brake cylinder and brake system

Info

Publication number: CN113819168B
Application number: CN202111175349.5A
Authority: CN
Inventors: 韩凤喜; 王帅; 刘帅; 董振威; 马法运; 孙国斌; 冯勇; 王中祥
Original assignee: CRRC Qingdao Sifang Rolling Stock Research Institute Co Ltd
Current assignee: CRRC Qingdao Sifang Rolling Stock Research Institute Co Ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2023-06-09
Anticipated expiration: 2041-10-09
Also published as: CN113819168A

Abstract

The invention proposes an electromechanical parking brake cylinder and a brake system comprising: a cylinder body, wherein a channel penetrating the cylinder body is arranged in the cylinder body; an end cover connected to one end of the cylinder body and forming a containing cavity with the end cover; a drive assembly located within the receiving cavity, comprising: the transmission nut is internally provided with a transmission channel, is in relative rotation connection with the cylinder body, and is provided with internal threads at the upper part; the transmission screw rod is connected with the cylinder body in a relatively moving way, one end of the transmission screw rod is provided with an external thread matched with the internal thread, the other end of the transmission screw rod is provided with a pushing disc, and the transmission screw rod is partially positioned in the transmission channel; the elastic component is sleeved on the outer sides of the screw shaft and the transmission nut, and one end of the elastic component is connected with the push disc and is in relative rotation connection with the transmission nut; and the clutch is connected with the transmission nut and the end cover. The invention has compact structure and small occupied space, adopts the mode of elastic force direct pushing output of the elastic component when the parking force is output, reduces the loss of resistance and improves the output efficiency of the parking force.

Description

Electromechanical parking brake cylinder and brake system

Technical Field

The invention belongs to the technical field of rail train brakes, and particularly relates to an electromechanical parking brake cylinder and a brake system.

Background

Due to the current development trend of rail train intellectualization, networking, light weight and miniaturization, the requirements for the electromechanical brake cylinder are becoming wider and wider. However, the braking parking force of the existing electromechanical brake cylinder is transmitted and released in a torque mode, the torque is required to be converted into parking thrust through structures such as trapezoidal threads or ball screws, the process always has energy loss, and a large part of stored energy input into the brake cylinder cannot be converted into the parking thrust when output is carried out, namely, a large part of stored energy cannot be released, so that the parking braking force output efficiency is low, and the design requirement on the brake cylinder is improved; meanwhile, the performance requirement on the clutch for locking is high, the whole structure is complex, the occupied space is large, and the development requirement cannot be met.

Disclosure of Invention

The invention aims at the technical problems and provides an electromechanical parking brake cylinder and a brake system. The electromechanical parking brake cylinder has compact integral structure and small occupied space at the bottom of a vehicle, adopts a mode of directly pushing and outputting by an elastic component, reduces the loss of resistance, improves the output efficiency, and reduces the size of the elastic component stored during energy storage; meanwhile, the locking moment is reduced in a threaded locking mode, and therefore the performance requirement on the clutch is reduced.

In order to achieve the above object, the present invention provides an electromechanical parking brake cylinder comprising:

a cylinder body, wherein a channel penetrating the cylinder body is arranged in the cylinder body;

the end cover is connected to one end of the cylinder body, and the end cover and the cylinder body form a containing cavity;

a drive assembly located within the receiving cavity, comprising:

the transmission nut is in relative rotation connection with the cylinder body, a transmission channel is arranged in the transmission nut, and an internal thread is arranged on the upper part of the transmission channel;

the transmission screw rod is connected with the cylinder body in a relatively moving way, one end of the transmission screw rod is provided with an external thread matched with the internal thread, the other end of the transmission screw rod is provided with a pushing disc, and the transmission screw rod is partially positioned in the transmission channel;

the elastic component is positioned in the accommodating cavity and is in relative rotation connection with the transmission nut; the elastic component is sleeved on the outer sides of the screw shaft and the transmission nut, and one end of the elastic component is connected with the push disc;

a clutch connecting the drive nut and the end cap;

the elastic component is locked in a compressed state at the moment; and releasing the locking of the elastic component through the clutch according to the parking instruction, and continuously pushing the pushing disc to directly output the parking braking force after the elastic component pushes the pushing disc to separate the internal thread from the external thread.

The electromechanical parking brake cylinder provided by the technical scheme has a simple and compact structure. When the vehicle is parked, the clutch is powered off to release the lock, and the elastic component is released. The transmission screw rod moves leftwards under the action of the elastic component to drive the transmission nut to reversely rotate, after the transmission screw rod moves leftwards for a certain distance, the outer trapezoidal nut of the transmission screw rod is completely separated from the inner trapezoidal thread of the transmission nut, the transmission nut does not limit the movement of the transmission screw rod any more, and the elastic force of the elastic component directly generates parking braking force through the pushing disc of the transmission screw rod, so that parking braking of a vehicle is realized. According to the technical scheme, the elastic component is adopted to directly push and output, so that the loss of resistance is reduced, the output efficiency is improved, and the force of the elastic component stored during energy storage is reduced. And the force of the elastic component which needs to be stored during energy storage is smaller, and the locking moment is reduced in a threaded locking mode, so that the performance requirement on the clutch is reduced.

In some of these embodiments, the internal thread is an internal trapezoidal thread and the external thread is an external trapezoidal thread;

each thread cutting end of the internal trapezoidal thread is provided with a first plane surface which radially passes through the central line of the internal trapezoidal thread, and both ends of the first plane surface are provided with first transitional cambered surfaces;

each thread cutting end of the external trapezoidal thread is provided with a second plane, the second plane radially passes through the central line of the external trapezoidal thread, and two ends of the second plane are provided with second transitional cambered surfaces. The chamfer designs of the first plane tangential surface, the second plane tangential surface, the first transition cambered surface and the second transition cambered surface ensure that the external trapezoidal thread and the internal trapezoidal thread can be normally screwed under the action of axial force no matter what angle the transmission screw rod and the transmission nut start to be in threaded fit, and ensure that the energy storage locking is accurately realized.

In some of these embodiments, the rounded corners of the first and second transition arcs are 1mm; the internal trapezoidal thread and the external trapezoidal thread are double-thread threads; the double-thread enables the relative rotation angle required by the initial screwing of the external trapezoidal thread of the transmission screw and the internal trapezoidal thread of the transmission nut to be smaller than 180 degrees, and compared with the single-thread, the screwing speed is faster and the required movement amount is smaller under the condition of the same thread pitch.

In some of these embodiments, the receiving cavity comprises three cavities of different inner diameters, a first cavity, a second cavity and a third cavity, respectively; the elastic component is positioned in the first cavity, the periphery of the transmission nut is provided with a mounting part, the mounting part is rotationally connected in the second cavity, and two ends of the transmission nut are respectively positioned in the first cavity and the third cavity; the clutch is arranged in the third cavity and comprises a fixed part and a rotating part, one side, away from the rotating part, of the fixed part is connected with the end cover, and one side, away from the fixed part, of the rotating part is connected with the transmission nut.

According to the technical scheme, the accommodating cavities with different inner diameters are arranged for installing and accommodating the elastic component, the transmission nut, the clutch, the end cover and other parts; the two ends of the elastic component are limited between the pushing disc and the second cavity, the transmission nut is rotationally connected in the second cavity through the mounting part, and the transmission nut is located in the three cavities, so that the structure is compact, simple and convenient, the occupied space of the lower vehicle bottom can be ensured, and the requirements of light weight and miniaturization of the rail train are met.

In some of these embodiments, the drive screw is located within a first cavity, comprising:

the external thread is arranged at one end of the screw shaft, and the pushing disc is arranged at the other end of the screw shaft;

the boss is fixedly arranged outside the screw shaft and is in sliding connection with the transmission channel; the screw shaft can stably move in the transmission channel through the sliding connection of the boss and the transmission channel.

In some embodiments, the transmission assembly further comprises a turntable, one side of the turntable is connected with the transmission nut, and the other side of the turntable is connected with the rotating part; the transmission nut and the clutch are fixedly connected through the turntable, so that the connection stability is ensured, and the operation is simple.

In some embodiments, the push disc is provided with an anti-rotation piece, and the cylinder body is provided with an anti-rotation groove matched with the anti-rotation piece and axially and slidably matched with the anti-rotation piece; the relative circular motion between the screw shaft and the cylinder body is effectively prevented through the axial sliding fit between the anti-rotation piece and the anti-rotation groove, and the working stability of the electromechanical parking brake cylinder is further improved.

In some embodiments, a first key groove is formed in one end, connected to the end cover, of the cylinder body, and a threaded hole is formed in the first key groove; the end cover is provided with a first spline matched with the first key groove, the first spline is provided with a threaded through hole, and the end cover penetrates through the threaded through hole through a connecting piece and is connected in the threaded hole, so that the end cover is fixedly connected with the cylinder body; the connecting mode is simple in structure and convenient to operate.

In some of these embodiments, the electromechanical parking brake cylinder further includes a brake assembly comprising:

the braking part is fixedly provided with a motor, one side of the braking part is provided with a thrust shaft, and the thrust shaft is fixedly arranged on a shell of the motor;

the first supporting part is arranged at intervals with the braking part, the first supporting part is connected to the other end of the cylinder body and is in butt joint with the push disc, a through hole for the thrust shaft to pass through is formed in the middle of the first supporting part, and the braking part is connected with the first supporting part in a relatively movable mode;

the second supporting part is positioned on the other side of the braking part, and is fixedly arranged on an output shaft of the motor, and the output shaft stretches and contracts to enable the braking part to be connected with the second supporting part in a relative movement mode.

According to the technical scheme, the brake assembly is arranged, the expansion and contraction of the output shaft of the brake part is controlled through the rotation of the control motor, and then the thrust shaft is driven to be in butt joint with the push disc, so that the push disc is pushed to move towards the clutch direction and locked, and the energy storage of the parking cylinder is realized.

The invention also provides a braking system comprising a clamp assembly and the electromechanical parking brake cylinder according to any one of the above claims, wherein the clamp assembly is connected with a push disc of the electromechanical parking brake cylinder.

Drawings

FIG. 1 is a schematic diagram of a brake system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an electromechanical parking brake cylinder according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the internal structure of an electromechanical parking brake cylinder in accordance with another embodiment of the present invention;

FIG. 4 is a schematic view of a cylinder according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a cylinder according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a driving screw according to an embodiment of the present invention;

FIG. 7 is a schematic view of a driving nut according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a turntable according to an embodiment of the present invention;

fig. 9 is a schematic structural view of an end cap according to an embodiment of the present invention.

Wherein: an electromechanical parking brake cylinder 100; a cylinder 1; an anti-rotation groove 11; a first keyway 12; a screw hole 121; a flange 13; mounting through holes 131; an end cap 2; a first spline 21; a threaded through hole 22; a transmission assembly 3; a drive nut 31; a transmission channel 311; an internal trapezoidal thread 312; a first planar cut surface 3121; a first transitional cambered surface 3122; a mounting portion 313; a bearing 314; a thrust bearing 315; a second keyway 316; a drive screw 32; a screw shaft 321; an external trapezoidal thread 3211; a second planar segment 32111; a second transitional cambered surface 32112; a push plate 322; an anti-rotation member 3221; a boss 323; an elastic component 4; a clutch 5; a rotating portion 51; a fixing portion 52; a turntable 6; a second spline 61; a mounting hole 62; a housing chamber 7; a first cavity 71; a second cavity 72; a third cavity 73; a brake assembly 8; a first supporting portion 81; a through hole 811; a braking section 82; a thrust shaft 821; a second support 83; a clamp assembly 9.

Detailed Description

The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

It should be noted that, for the understanding of the technical solution of the present invention, the transmission relation of the transmission assembly 3 in this embodiment is described by taking the left-hand driving screw 32 as an example, with reference to fig. 3, and the view angle of the rotation direction is taken as a right-left view. If the rotation direction of the driving screw 32 is changed, the rotation direction and the movement relation of the parts and components matched with the driving screw are correspondingly changed.

Referring to fig. 3, the present invention provides an electromechanical parking brake cylinder 100 comprising:

a cylinder 1 having a passage penetrating the cylinder 1 provided therein;

the end cover 2 is connected to one end of the cylinder body 1, and the end cover 2 and the cylinder body 1 form a containing cavity 7;

a transmission assembly 3, located in the housing chamber 7, comprising:

the transmission nut 31 is in relative rotation connection with the cylinder body 1, a transmission channel 311 is arranged in the transmission nut 31, and an internal thread is arranged on the upper part of the transmission channel 311;

the transmission screw rod 32 is connected with the cylinder body 1 in a relatively moving way, one end of the transmission screw rod 32 is provided with external threads matched with the internal threads, the other end of the transmission screw rod 32 is provided with a push disc 322, and the transmission screw rod 32 is partially positioned in the transmission channel 311;

the elastic component 4 is positioned in the accommodating cavity 7 and sleeved outside the screw shaft 321 and the transmission nut 31, one end of the elastic component 4 is connected with the push disc 322, and the elastic component 4 is connected with the transmission nut 31 in a relative rotation manner; preferably, the elastic component 4 is a disc spring set;

a clutch 5 connecting the drive nut 31 and the end cap 2;

wherein, according to the received energy storage instruction, the elastic component 4 is moved and extruded through the transmission screw rod 32 to store energy, and then the energy storage locking is carried out through the cooperation between the clutch 5 and the internal and external threads, and at the moment, the elastic component 4 is locked in a compressed state; according to the parking instruction, the locking of the elastic component 4 is released through the clutch 5, and after the elastic component 4 pushes the pushing disc 322 to separate the internal thread from the external thread, the pushing disc 322 is continuously pushed to directly output the parking braking force.

The electromechanical parking brake cylinder 100 provided in this embodiment is simple and compact in structure. Preferably, the internal threads are internal trapezoidal threads 312 and the external threads are external trapezoidal threads 3211. When the energy storage is carried out, the transmission screw rod 32 moves to the right side to transmit braking force, the disc spring group is acted to compress the disc spring group under the stress, the boss 323 moves in the transmission channel 311, the external trapezoidal thread 3211 and the internal trapezoidal thread 312 are not screwed, and the transmission nut 31 does not rotate and does not limit the movement of the transmission screw rod 32. When the drive screw 32 moves to the station to be locked, the male and

female acme threads

3211, 312 begin to be screwed. The drive nut 31 is rotationally connected with the cylinder body 1, so that the drive nut 31 rotates to enable the drive screw 32 to continuously move to the right side and continuously compress the disc spring group, at the moment, the clutch 5 is controlled to be electrified, the drive nut 31 is fixedly connected with the cylinder body 1 to limit the rotation of the drive nut 31, and the drive screw 32 cannot continuously move to the right side or the left side to enable the disc spring group to be locked in a compressed state, so that parking energy storage is carried out.

The present embodiment provides an electromechanical parking brake cylinder 100 in which the clutch 5 is de-energized to release the lock of the locking disc spring set during parking braking. The transmission screw 32 moves leftwards under the action of the disc spring set to drive the transmission nut 31 to reversely rotate, after the transmission screw 32 moves leftwards for a certain distance, the outer trapezoidal nut of the transmission screw 32 is completely separated from the inner trapezoidal thread 312 of the transmission nut 31, the transmission nut 31 does not limit the movement of the transmission screw 32 any more, and the elastic force of the elastic component 4 directly generates parking braking force through the push disc 322 of the transmission screw 32, so that parking braking of a vehicle is realized. According to the embodiment, the parking force is output in a disc spring force direct pushing output mode, so that the loss of resistance is reduced, the output efficiency is improved, and the size of the disc spring force stored in energy storage is reduced; the disc spring force required to be stored in the process of energy storage is small, and the locking moment is reduced in a threaded locking mode, so that the performance requirement on the clutch 5 is reduced; simultaneously, the locking is performed in a mode of matching the clutch 5 through threads, and the labor-saving locking has the advantage of saving the labor. In other embodiments, the internal and external threads may be other non-self-locking threads.

In the above embodiment, referring to fig. 6 and 7, each thread cutting end of the internal trapezoidal thread 312 is provided with a first flat cutting surface 3121, the first flat cutting surface 3121 radially passes through the center line of the internal trapezoidal thread 312, and both ends thereof are provided with a first transitional cambered surface 3122; each thread cutting end of the external trapezoidal thread 3211 is provided with a second plane 32111, the second plane 32111 radially passes through the center line of the external trapezoidal thread 3211, and both ends thereof are provided with a second transitional cambered surface 32112. By arranging the first flat cutting surface 3121, the second flat cutting surface 32111, the first transition cambered surface 3122 and the chamfer of the second transition cambered surface 32112, the transmission screw 32 and the transmission nut 31 can start to be in threaded fit no matter what angle, and the external trapezoidal thread 3211 and the internal trapezoidal thread 312 can be normally screwed under the action of axial force, so that the energy storage locking can be accurately realized. In this embodiment, the male trapezoidal threads 3211 and the female trapezoidal threads 312 have the same nominal diameter so that they can be screwed together. Preferably, the nominal diameter is 20mm, the lead is 12mm, and the rounded corners of the first and second transition arcs 3122 and 32112 are 1mm. In this embodiment, the internal trapezoidal thread 312 and the external trapezoidal thread 3211 are preferably double-thread threads, and the double-thread threads enable the relative rotation angle required by the initial rotation of the external trapezoidal thread 3211 of the driving screw 32 and the internal trapezoidal thread 312 of the driving nut 31 to be smaller than 180 degrees, and compared with the single-thread threads, the screwing speed is faster and the required movement amount is smaller under the condition of the same thread pitch. It should be noted that the internal trapezoidal thread 312 and the external trapezoidal thread 3211 may be single-threaded or three-threaded.

Further, the accommodating cavity 7 includes three cavities with different inner diameters, namely a first cavity 71, a second cavity 72 and a third cavity 73, the elastic component 4 is located in the first cavity 71, the periphery of the transmission nut 31 is provided with a mounting portion 313, the mounting portion 313 is rotatably connected in the second cavity 72, two ends of the transmission nut 31 are located in the first cavity 71 and the third cavity 73, and the clutch 5 is located in the third cavity 73. The accommodating cavities 7 with different inner diameters are used for installing and accommodating the elastic components 4, the transmission nuts 31, the clutches 5, the end covers 2 and other components, so that the whole structure is compact and simple, the small occupied space of the bottom of the train can be ensured, and the light-weight and miniaturized requirements of the rail train are met. Preferably, the mounting portion 313 is a bearing housing.

Specifically, referring to fig. 5, the cylinder block 1 is used to protect and support the electromechanical parking brake cylinder 100 provided in the present embodiment, and the cylinder block 1 is integrally provided. The housing chamber 7 formed by the end cover 2 and the cylinder 1 includes a first cavity 71, a second cavity 72 and a third cavity 73, in this embodiment, the second cavity 72 is located between the third cavity 73 and the second cavity 72, and the inner diameter of the third cavity 73 is the largest, and the inner diameter of the second cavity 72 is the smallest.

Referring to fig. 3, 6 and 7, the driving screw 32 is located in the first cavity 71, the driving screw 32 includes a screw shaft 321 and a boss 323, wherein an external thread is provided at one end of the screw shaft 321, and the push plate 322 is provided at the other end; the boss 323 is fixedly arranged outside the screw shaft 321 and is in sliding connection with the transmission channel 311. The periphery of the transmission nut 31 is provided with a mounting part 313, the mounting part 313 is rotatably connected in the second cavity 72 through a bearing 314, a group of thrust bearings 315 are respectively arranged at the left side and the right side of the mounting part 313 for maintaining the position of the transmission nut 31, and the transmission nut 31 can only rotate and cannot move under the limitation of the bearing 314 and the thrust bearings 315. The two ends of the drive nut 31 are respectively positioned in the first cavity 71 and the third cavity 73, the drive screw 32 is positioned in the first cavity 71, and the boss 323 thereof is slidably connected in the drive channel 311.

Referring to fig. 3, the elastic component 4 is located in the first cavity 71, and is sleeved outside the screw shaft 321 and part of the transmission nut 31; the elastic assembly 4 is axially delimited at both ends by a thrust plate 322 and a thrust bearing 315, respectively. Further, referring to fig. 6, an anti-rotation member 3221 is provided on the push plate 322, and an anti-rotation groove 11 matched with the anti-rotation member 3221 is provided on the cylinder 1, which is axially slidably engaged with the anti-rotation member 3221. In this embodiment, the anti-rotation members 3221 are provided with two and are symmetrically arranged on the push disc 322, and the relative circular motion between the screw shaft 321 and the cylinder body 1 is effectively prevented through the axial sliding fit between the anti-rotation members 3221 and the anti-rotation grooves 11, so that the working stability of the electromechanical parking brake cylinder 100 is further improved.

Referring to fig. 3, the clutch 5 includes a fixed portion 52 and a rotating portion 51, a side of the fixed portion 52 away from the rotating portion 51 is connected to the end cap 2, and a side of the rotating portion 51 away from the fixed portion 52 is connected to the drive nut 31. In this embodiment, the clutch 5 is an electromagnetic clutch, and the rotating portion 51 is connected to the fixed portion 52 in an adsorption manner by the electromagnetic clutch, so that the clutch cannot rotate as a whole; the power-off rotating part 51 and the fixed part 52 are separated to realize rotation.

Further, referring to fig. 3 and 8, the transmission assembly 3 further includes a turntable 6, one side of the turntable 6 is connected to the transmission nut 31, and the other side thereof is connected to the rotating portion 51. Specifically, a second spline 61 is arranged in the middle of the turntable 6, a second key groove 316 matched with the second spline 61 is arranged at one end of the transmission nut 31, and the second spline 61 is matched with the second key groove 316 so that the turntable 6 is fixedly connected with the transmission nut 31; preferably, two second splines 61 are symmetrically provided in the present embodiment. Further, a plurality of mounting holes 62 are formed in the turntable 6, a plurality of mounting pieces corresponding to the plurality of mounting holes 62 are arranged on the rotating portion 51, and the plurality of mounting pieces are respectively mounted in the mounting holes 62 so that the rotating portion 51 is fixedly connected with the turntable 6; preferably, the turntable 6 has a disk structure, three mounting holes 62 are provided along the circumferential direction thereof, and the mounting holes 62 are screw holes.

Referring to fig. 4, a first key groove 12 is formed at one end of the cylinder body 1 connected to the end cover 2, and a threaded hole 121 is formed in the first key groove 12; the end cover 2 is provided with a first spline 21 matched with the first key groove 12, the first spline 21 is provided with a threaded through hole 22, and the end cover 2 is connected in the threaded hole 121 through the threaded through hole 22 by a connecting piece, so that the end cover 2 is fixedly connected with the cylinder body 1. In this embodiment, the first key groove 12 is preferably provided with four connecting pieces, preferably bolts, and the above connection mode is adopted to realize the fixed connection between the end cover 2 and the cylinder 1, so that the structure is simple and the operation is convenient.

Further, referring to fig. 2, the electromechanical parking brake cylinder 100 further includes a brake assembly 8, and the brake assembly 8 includes a brake portion 82, a first support portion 81, and a second support portion 83. The motor is disposed in the brake portion 82, and a thrust shaft 821 is disposed on one side of the brake portion 82, and the thrust shaft 821 is fixedly disposed on a housing of the motor. The first support portion 81 is disposed at an interval from the braking portion 82, the first support portion 81 is connected to the other end of the cylinder and abuts against the push plate 322, a through hole 811 through which the thrust shaft 821 passes is formed in the middle of the first support portion 81, and the braking portion 82 is connected to the first support portion 81 in a relatively movable manner. The second supporting portion 83 is located at the other side of the braking portion 82, and the second supporting portion 83 is fixedly arranged on an output shaft of the motor, and the output shaft stretches and contracts to enable the braking portion 82 to be connected with the second supporting portion 83 in a relatively moving mode. Specifically, a motor is disposed in the brake portion 82, a housing of the motor is fixedly connected with the motor, the second support portion 83 is fixedly disposed on an output shaft of the motor, the brake portion 82 and the second support portion 83 are associated with each other through the motor, and the brake portion and the second support portion can be moved relatively through the motor.

Specifically, the second supporting portion 83 is fixedly disposed on an output shaft of the motor, and the motor is fixedly disposed in the braking portion 82. The motor rotates to enable the motor output shaft in the braking part 82 to extend leftwards, and drives the second supporting part 83 to move leftwards, so that the gap between the clamp brake disc and the brake disc is gradually reduced. When the gap between the clamp brake pad and the brake disc is 0, the brake portion 82 moves towards the first supporting portion 81 along with the continuous extension of the motor output shaft, and then the thrust shaft 821 is driven to move, the thrust shaft 821 passes through the through hole 811 and abuts against the push disc 322, the thrust shaft 821 moves to push the transmission screw 32 to move towards the direction of the clutch 5 to squeeze the elastic assembly 4, and the clutch 5 is electrified and locked, so that the energy storage of the parking cylinder is completed. Referring to fig. 2 and 4, a flange 13 is provided at the outer circumference of one end of the cylinder 1 far from the end cover 2, and a plurality of mounting through holes 131 are provided on the flange 13, and the connection of the cylinder 1 and the first support 81 is achieved through the mounting member and the mounting through holes 131. In this embodiment, the brake assembly 8 is provided, and the rotation of the control motor controls the expansion and contraction of the left output shaft of the brake portion 82, so as to drive the thrust shaft 821 to abut against the push disc 322, thereby pushing the push disc 322 to move towards the direction of the clutch 5, and the clutch 5 is locked to store energy of the parking cylinder.

Specifically, the brake 82 is configured to extend and retract the left motor output shaft of the brake 82 by controlling the rotation of the motor and the movement conversion of the internal mechanism, and the thrust shaft 821 of the brake 82 is brought into contact with the drive screw 32 through the through hole 811 in the middle of the first support 81. The first support portion 81 is flexibly connected to the braking portion 82 by a spring or the like, preferably, the mounting member is a bolt, and the cylinder 1 is fixed to the first support portion 81 by a plurality of screws through the mounting through holes 131.

Referring to fig. 1 and 2, the present invention further provides a braking system, including a clamp assembly 9 and an electromechanical parking brake cylinder 100 according to any one of the above-mentioned embodiments, wherein the clamp assembly 9 is connected to a push plate 322 of the electromechanical parking brake cylinder 100. In this embodiment, the clamp assembly 9 includes two clamp arms, wherein the left clamp arm is fixedly connected to the second support portion 83, and the right clamp arm is fixedly connected to the first support portion 81.

In order to facilitate understanding of the technical solution of the present invention, the working process of the braking system provided in an embodiment is further described below.

And (3) parking energy storage: after the braking system receives the vehicle energy storage instruction, the braking part 82 extends out of the output shaft through controlling the motor to rotate, and the clamp assembly 9 gradually clamps the brake disc. The distance between the supporting surface of the braking portion 82 and the first supporting portion 81 is the largest when the brake disc is initially clamped, the acting force of the thrust shaft 821 on the driving screw 32 is zero, the distance between the supporting surface of the braking portion 82 and the supporting surface of the first supporting portion 81 is smaller as the clamping braking force is continuously extended out of the output shaft of the braking portion 82, the acting force of the braking reaction force of the thrust shaft 821 on the driving screw 32 is gradually increased, meanwhile, the driving screw 32 acts on the elastic component 4 to compress the force, the driving screw 32 moves to the right, at this time, the boss 323 moves in the driving channel 311, the external trapezoidal thread 3211 and the internal trapezoidal thread 312 are not screwed, and the driving nut 31 does not rotate and does not limit the movement of the driving screw 32. When the clamping force rises to a certain extent, the driving screw 32 moves to the right to the station to be locked, the external trapezoidal thread 3211 and the internal trapezoidal thread 312 start to be screwed, the reaction force of braking acts on the elastic assembly 4 through the driving screw 32 and acts on the driving screw 31 at the same time, and the driving screw 32 continues to move to the right because the driving screw 31 can only rotate under the limitation of the bearing 314 and the thrust bearing 315, and at this time the driving screw 31 rotates. The transmission nut 31 rotates to drive the rotating part 51 of the clutch 5 fixed on the turntable 6 to rotate, and the fixed part 52 of the clutch 5 is fixed on the cylinder 1 through the rear cover. When the distance between the supporting surface of the braking portion 82 and the first supporting portion 81 becomes 0, the electrically powered rotating portion 51 of the clutch 5 is absorbed by the fixing portion 52 to be integrally unable to rotate, at this time, the driving nut 31 is unable to rotate, the driving screw 32 is unable to move, the elastic assembly 4 is locked in a compressed state, and energy storage is completed. In this case, even if the clamping force of the brake system continues to rise or fall, the entire parking brake cylinder cannot be influenced.

Parking brake: after the braking system receives the parking brake command, the braking portion 82 stops outputting the braking force or keeps the released state, the power-off rotating portion 51 of the clutch 5 is separated from the fixed portion 52, and the lock of the elastic member 4 is released. The transmission screw 32 moves leftwards under the action of the elastic component 4, and then drives the transmission nut 31 to reversely rotate, at this time, the transmission screw 32 outputs acting force to the thrust shaft 821, so that the braking part 82 is contracted by a certain fixed length (the length is related to the motor back-off amount when the braking system is released), meanwhile, the external trapezoidal thread 3211 of the transmission screw 32 and the internal trapezoidal thread 312 of the transmission nut 31 are completely separated, the transmission nut 31 does not limit the movement of the transmission screw 32, and the elastic force of the elastic component 4 directly acts on the braking part 82 through the push disc 322 of the transmission screw 32, and further acts on the clamp arm to generate system parking braking force, so that the parking braking of the vehicle is realized.

In summary, the electromechanical parking brake cylinder 100 and the brake system provided by the invention adopt the mode of directly pushing and outputting the elastic force of the elastic component 4, thereby reducing the loss of resistance, improving the output efficiency of parking force, and reducing the elastic force of the elastic component 4 stored during energy storage. And the elastic force of the elastic component 4 which needs to be stored in the process of energy storage is smaller, and the locking moment is reduced in a threaded locking mode, so that the performance requirement on the clutch 5 is reduced. Meanwhile, the structure is simple and compact, and the occupied space is small.

The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.

Claims

1. An electromechanical parking brake cylinder, comprising:

a drive assembly located within the receiving cavity, comprising:

the elastic component is positioned in the accommodating cavity and is in relative rotation connection with the transmission nut; the elastic component is sleeved on the outer sides of the transmission screw rod and the transmission nut, and one end of the elastic component is connected with the push disc;

a clutch connecting the drive nut and the end cap;

the elastic component is locked in a compressed state at the moment; releasing the locking of the elastic component through the clutch according to the parking instruction, wherein the elastic component pushes the pushing disc to enable the internal thread and the external thread to be separated, and then continuously pushes the pushing disc to directly output parking braking force;

the internal thread is an internal trapezoidal thread, and the external thread is an external trapezoidal thread;

each thread cutting end of the external trapezoidal thread is provided with a second plane, the second plane radially passes through the central line of the external trapezoidal thread, and two ends of the second plane are provided with second transitional cambered surfaces.

2. The electromechanical parking brake cylinder of claim 1, wherein the rounded corners of the first transition cambered surface and the second transition cambered surface are 1mm, and the internal trapezoidal thread and the external trapezoidal thread are double-thread threads.

3. The electromechanical parking brake cylinder of claim 1, wherein the receiving chamber includes three cavities of different inner diameters, a first cavity, a second cavity, and a third cavity, respectively; the elastic component is positioned in the first cavity, the periphery of the transmission nut is provided with a mounting part, the mounting part is rotationally connected in the second cavity, and two ends of the transmission nut are respectively positioned in the first cavity and the third cavity; the clutch is arranged in the third cavity and comprises a fixed part and a rotating part, one side, away from the rotating part, of the fixed part is connected with the end cover, and one side, away from the fixed part, of the rotating part is connected with the transmission nut.

4. The electromechanical parking brake cylinder of claim 3, wherein the drive lead screw is located within a first cavity, comprising:

the boss is fixedly arranged outside the screw shaft and is in sliding connection with the transmission channel.

5. The electromechanical parking brake cylinder of claim 3, wherein said drive assembly further includes a turntable having one side connected to said drive nut and another side connected to said rotating portion.

6. The electromechanical parking brake cylinder according to claim 1, wherein an anti-rotation member is provided on the push plate, and the cylinder body is provided with an anti-rotation groove matching the anti-rotation member, which is axially slidably fitted with the anti-rotation member.

7. The electromechanical parking brake cylinder of claim 1, wherein a first keyway is provided at an end of the cylinder body connected to the end cap, the first keyway having a threaded bore therein; the end cover is provided with a first spline matched with the first key groove, the first spline is provided with a threaded through hole, and the end cover penetrates through the threaded through hole through a connecting piece to be connected in a threaded hole, so that the end cover is fixedly connected with the cylinder body.

8. The electromechanical parking brake cylinder of claim 1, further comprising a brake assembly, the brake assembly comprising:

the first supporting part is arranged at intervals with the braking part, is connected to the other end of the cylinder body and is in butt joint with the push disc, a through hole for the thrust shaft to pass through is formed in the middle of the first supporting part, and the braking part is connected with the first supporting part in a relatively movable mode;

9. A brake system comprising a caliper assembly and an electromechanical parking brake cylinder as claimed in any one of claims 1 to 8, the caliper assembly being connected to a push disc of the electromechanical parking brake cylinder.