CN111319596B

CN111319596B - Electromechanical brake cylinder with parking function and brake system

Info

Publication number: CN111319596B
Application number: CN202010242810.3A
Authority: CN
Inventors: 杨磊; 刘帅; 马飞; 苗峰
Original assignee: CRRC Qingdao Sifang Rolling Stock Research Institute Co Ltd
Current assignee: CRRC Qingdao Sifang Rolling Stock Research Institute Co Ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-03-23
Anticipated expiration: 2040-03-31
Also published as: CN111319596A

Abstract

The invention provides an electromechanical brake cylinder with a parking function, comprising: a brake device, the brake device comprising: a first cylinder assembly; the first transmission assembly is positioned in the first cylinder body assembly and is provided with a first connecting part; parking brake apparatus, parking brake apparatus includes: a second cylinder block assembly; the second transmission assembly is positioned in the second cylinder body assembly, the connecting shaft is positioned in the second cylinder body assembly and positioned between the first transmission assembly and the second transmission assembly and connected with the second transmission assembly, the connecting shaft is provided with a first connecting matching portion, and the first connecting matching portion is transversely and separably connected with the first connecting portion. The electromechanical brake cylinder with the parking function provided by the invention realizes the parking function of the electromechanical brake cylinder, has a compact structure, and can ensure a smaller vehicle bottom occupation space. The invention further provides a brake system, and the electromechanical brake cylinder is applied.

Description

Electromechanical brake cylinder with parking function and brake system

Technical Field

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

Background

Due to the development trend of intellectualization, networking, light weight and miniaturization of the rail train at present, the demand on the electromechanical brake cylinder is more and more extensive. However, the existing electromechanical brake cylinder does not have a parking function, and the traditional parking brake cylinder cannot meet the requirements.

Next, referring to fig. 1, the conventional pneumatic or hydraulic brake cylinder with parking function includes a pneumatic or hydraulic brake device 1 ', a parking brake device 2', and a wedge 3 ', and a transmission structure of the pneumatic or hydraulic brake device 1' and a transmission structure of the parking brake device 2 'are vertically connected in a longitudinal direction by the wedge 3'. However, the parking brake device 2' vertically arranged in the longitudinal direction occupies a larger longitudinal space at the bottom of the vehicle, and cannot be directly applied to the existing electromechanical brake device.

Disclosure of Invention

Aiming at the technical problems that the existing electromechanical brake device does not have a parking function and cannot be applied to the electromechanical brake device, the invention provides the electromechanical brake cylinder with the parking function. The invention also provides a rail train applying the electromechanical brake cylinder with the parking function.

In order to achieve the purpose, the invention adopts the following technical scheme:

electromechanical brake cylinder with parking function, comprising:

a braking device, the braking device comprising:

a first cylinder assembly;

the first transmission assembly penetrates through the first cylinder body assembly, the first transmission assembly is connected with the first cylinder body assembly, and the first transmission assembly is provided with a first connecting part;

a parking brake device, the parking brake device comprising:

a second cylinder assembly transversely connected to the first cylinder assembly;

a second transmission assembly connected within the second cylinder assembly;

the connecting shaft is located in the second cylinder body assembly, the connecting shaft is located between the first transmission assembly and the second transmission assembly, the connecting shaft is connected with the second transmission assembly, the connecting shaft is provided with a first connecting matching portion, and the first connecting matching portion is transversely connected with the first connecting portion.

Further, the first transmission assembly includes:

the first transmission lead screw is in relative rotation connection with the first cylinder body assembly, and the first transmission lead screw is provided with the first connecting part;

the first transmission nut is connected with the first cylinder body assembly in a relatively moving mode, and the first transmission nut is in transmission connection with the first transmission screw rod.

The second transmission assembly includes:

the second transmission nut is connected with the second cylinder body assembly in a relative rotation mode;

the second transmission screw rod is in relative moving connection with the second cylinder body assembly, and the second transmission nut is in transmission connection with the second transmission screw rod;

the parking brake device further includes:

and the connecting shaft is connected with the second transmission nut through the overrunning clutch.

Further, first connecting portion are fan-shaped groove structure, first connection cooperation portion are fan-shaped protruding structure, fan-shaped protruding structure with fan-shaped groove structure is connected, fan-shaped groove structure's central angle is greater than fan-shaped protruding structure's central angle, when service brake with alleviate commonly used, fan-shaped groove structure with fan-shaped protruding structure's both sides face all contactless.

Further, after the common relief, the angle range of the side surface of the fan-shaped groove and the fan-shaped protrusion structure, which are close to each other, is 0-15 °.

Further, the parking brake device further includes:

the electromagnetic clutch is connected with the second cylinder body assembly and is connected with the second transmission nut;

the elastic component is sleeved on the second transmission lead screw, and the second transmission lead screw is abutted to the elastic component.

Further, the elastic assembly includes:

a first resilient member located within the second cylinder assembly;

the acting piece is sleeved on the outer side of the second transmission nut, the first elastic piece is sleeved on the outer side of the acting piece, and the acting piece is provided with:

the second transmission screw is provided with a first action matching part which is abutted against the first action matching part, and the second transmission screw drives the action piece to move through the first action matching part and the first action matching part;

the second action part is in contact connection with the first elastic piece, and the first elastic piece is in relative rotating connection with the second action part.

Further, the parking brake device further includes a locking device including:

the first stop piece is positioned in the second cylinder body assembly, the first stop piece is in relative rotation connection with the second cylinder body assembly, the first stop piece is in relative movement connection with the second transmission screw rod, and the first stop piece is provided with a stop matching part;

the second cylinder body assembly is provided with a first through hole, the second stop piece penetrates through the first through hole and extends into the second cylinder body assembly, one end, extending into the second cylinder body assembly, of the second stop piece is provided with a stop part, and the stop part and the stop matching part can be mutually clamped and connected.

Further, the locking device further includes:

the fixing piece is connected to the outer side of the second cylinder body assembly, an accommodating cavity is formed in the fixing piece, the second stop piece is located in the accommodating cavity, the fixing piece is provided with a second through hole which is communicated with the first through hole, the stop part penetrates through the second through hole and the first through hole and enters the second cylinder body assembly, and the fixing piece is further provided with a third through hole;

the second elastic piece is positioned in the accommodating cavity and sleeved on the second stop piece, and two ends of the elastic piece are respectively abutted against the second fixing piece and the inner wall of the accommodating cavity;

the second stop piece penetrates through the third through hole, and the pulling piece is connected with the second stop piece.

Further, the braking device further includes:

the motor, the motor connect in the first cylinder body subassembly, the motor with first transmission screw is connected.

Further, the braking device further includes:

and the rotary encoder is connected between the first transmission lead screw and the first cylinder body assembly.

Further, still include the load measurement subassembly, the load measurement subassembly includes:

the load sensor is sleeved on the outer side of the second cylinder body assembly;

the sliding part is sleeved on the outer side of the load sensor, and the sliding part and the second cylinder body assembly are connected in a relative one-way movement mode towards the first cylinder body assembly.

The invention also provides a brake system, which comprises the electromechanical brake cylinder with the parking function.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention provides an electromechanical brake cylinder with a parking function, which comprises a brake device and a parking brake device, wherein the brake device comprises a first cylinder body assembly and a first transmission assembly, the first transmission assembly is positioned in the first cylinder body assembly, and the first transmission assembly is provided with a first connecting part; the parking brake device comprises a second cylinder body assembly, a second transmission assembly and a connecting shaft, the second cylinder body assembly is transversely connected with the first cylinder body assembly, the second transmission assembly is located in the second cylinder body, the connecting shaft is connected with the second transmission assembly, a first connecting matching portion is arranged on the connecting shaft, and the first connecting matching portion is transversely clamped and connected with the first connecting portion. According to the electromechanical brake cylinder with the parking function, the brake device is horizontally and transversely connected with the parking brake device, the brake device drives the second transmission assembly which is transversely connected with the first transmission assembly through the first transmission assembly, the parking function of electromechanical braking is achieved, the structure is compact, the occupied space of the train bottom is small, and the requirements of light weight and miniaturization of a rail train are met.

2. The invention provides an electromechanical brake cylinder with a parking function.A first transmission assembly comprises a first transmission lead screw and a first transmission nut, the first transmission lead screw is relatively and rotatably connected with a first cylinder body assembly, the first transmission nut is relatively and movably connected with the first cylinder body assembly, the first transmission lead screw is mutually in transmission connection with the first transmission nut, and a first connecting part is arranged on a first transmission lead screw; the second transmission assembly comprises a second transmission lead screw, a second transmission nut, a connecting shaft and an overrunning clutch, the second transmission lead screw is connected with the second cylinder assembly in a relatively moving mode, the second transmission nut is connected with the second cylinder assembly in a relatively rotating mode, the second transmission lead screw is connected with the second transmission nut in an mutually transmission mode, the second transmission nut is connected with the connecting shaft through the overrunning clutch, the connecting shaft is provided with a first connecting matching portion, and the first connecting matching portion is connected with the first connecting portion of the first transmission lead screw in a mutually clamped mode.

According to the electromechanical brake cylinder with the parking function, when the brake device acts, the first transmission lead screw rotates towards the first direction, and the first transmission lead screw drives the first transmission nut to move towards the direction far away from the brake clamp, so that brake release is realized; meanwhile, the first transmission screw rod drives the connection shaft to rotate towards the first direction through the first connection part and the first connection matching part which are connected in a clamping mode, the overrunning clutch is in a connection state, the connection shaft drives the second transmission nut to rotate towards the first direction through the overrunning clutch, and the second transmission nut drives the second transmission screw rod to move, so that linkage of the braking device and the parking braking device is achieved. Conversely, the first transmission screw rod rotates towards a second direction opposite to the first direction, and the first transmission screw rod drives the first transmission nut to move towards the direction of the brake clamp, so that braking is realized; meanwhile, the first transmission screw rod drives the connection shaft to rotate towards the second direction through the first connection part and the first connection matching part which are connected in a clamping mode, the overrunning clutch is in an overrunning state, the connection shaft and the second transmission nut rotate relatively, the second transmission nut does not act, and the brake device and the parking brake device are separated.

When the parking brake device acts, the second transmission screw rod moves reversely, the second transmission screw rod drives the second transmission nut to rotate towards a second direction opposite to the first direction, the overrunning clutch is in a connection state, the second transmission nut drives the connection shaft to rotate towards the second direction, the connection shaft drives the first transmission screw rod to rotate towards the second direction through the first connection part and the first connection matching part which are clamped mutually, the first transmission screw rod drives the first transmission nut to move towards the direction of the brake clamp, the linkage of the parking brake device and the brake device is realized, and the parking brake is realized.

According to the brake cylinder with the parking function, the first transmission screw rod is connected with the second transmission screw rod through the connecting shaft and the overrunning clutch, and the braking function and the relieving function are realized through linkage between the braking device and the parking braking device; the parking brake function is realized through the linkage between the parking brake device and the brake device. The brake device has the advantages that the connection structure between the brake device and the parking brake device is simplified, the overall structure of the brake cylinder with the parking function is further reduced, the compact structure of the brake system is improved, and the light-weight and miniaturized requirements of the rail train are met.

3. According to the electromechanical brake cylinder with the parking function, the first connecting part of the first transmission lead screw is of a fan-shaped groove structure, the first connecting matching part of the connecting shaft is of a fan-shaped convex structure, and the central angle of the fan-shaped groove structure is larger than that of the fan-shaped convex structure.

When the electromechanical brake cylinder with the parking function provided by the embodiment is in a service braking state from a release state, namely when a train runs and a braking device acts to perform service braking, the first transmission screw rod rotates towards the second direction, at the moment, the surfaces of the fan-shaped groove structure, which are in contact with one side of the fan-shaped protrusion structure, are gradually separated from each other from a mutual contact state, and at the moment, the first transmission nut moves towards a brake clamp direction under the action of the first transmission screw rod; when the sector groove structure just contacts or does not contact with the surface of the other side of the sector protrusion structure, the moving distance of the first transmission screw rod just enables the brake clamp to clamp the brake disc, service braking is achieved, the rotation of the first transmission screw rod is cut off through the sector groove structure and the sector protrusion structure, and the transmission to the second transmission screw rod is prevented.

Further, in practical application, because the circumstances such as installation and adjustment reason or change braking clamp in the initial use stage for the displacement of first drive nut increases, then when requiring first drive lead screw to continue to rotate to the second direction, fan-shaped groove structure probably contacted with the face of fan-shaped protruding structure opposite side, the face that should contact can drive and connect the rotation of axial second direction, freewheel clutch is in the state of surging this moment, the relative rotation takes place for connecting axle and second drive nut, the rotation of first drive lead screw is through this fan-shaped groove structure, fan-shaped protruding structure and freewheel clutch excision, prevent to transmit the second drive lead screw, and then realize service brake.

On the contrary, the electromechanical brake cylinder of function is parked in area that this embodiment provided, by the service brake state when alleviating the state frequently, when the train moves promptly, the arresting gear action was alleviated frequently, first drive screw rotates to first direction, fan-shaped groove structure and fan-shaped protruding structure opposite side face of mutual contact throw off gradually this moment, first drive nut removes to the direction of keeping away from the braking clamp under first drive screw's effect this moment, alleviate in braking, the face of fan-shaped groove structure and fan-shaped protruding structure one side is close to each other, the distance that first drive nut removed this moment makes the displacement of braking clamp satisfy the specified value of alleviating the clearance, realize alleviating frequently. The rotation of the first drive screw is cut off by the fan-shaped groove structure and the fan-shaped bulge structure, and is prevented from being transmitted to the second drive screw.

The area that this embodiment provided parks electromechanical brake jar of function, carry out service brake and when alleviating with commonly using, do not take place the transmission between first drive screw and the second drive nut, only need arresting gear to carry out service brake and alleviate commonly using promptly, it need not the action to park arresting gear, and arresting gear's action can not carry out repeated energy storage to parking arresting gear, can not lead to the fact the influence to parking device, the reliability and the life of parking device have further been improved, the area that this embodiment provided parks electromechanical brake jar of function's braking operation's accuracy nature and stability have been improved.

Drawings

FIG. 1 is a schematic structural diagram of a conventional pneumatic or hydraulic brake cylinder with a parking function;

FIG. 2 is a schematic cross-sectional structural diagram of an electromechanical brake cylinder with a parking function provided in this embodiment;

FIG. 3 is a schematic view of the first drive nut of FIG. 2;

FIG. 4 is a schematic view of the first lead screw drive provided in FIG. 2;

FIG. 5 is a schematic structural view of the connection shaft provided in FIG. 2;

FIG. 6 is a schematic structural view of a second lead screw drive provided in FIG. 2;

fig. 7 is a schematic structural view of the first stopper provided in fig. 2.

The reference numerals are explained in detail:

1. a braking device; 11. a first cylinder assembly; 111. a first cylinder body; 112. a first rear end cap; 113. a first front end cap; 1131. a first guide portion; 12. a motor; 121. a stator; 122. a rotor; 13. a first transmission assembly; 131. a first connecting member; 132. a first drive screw; 1321. a first connection portion; 1322. a first mating surface; 1323. a second mating surface; 133. a first drive nut; 1331. a first limiting part; 1332. a first guide portion fitting portion; 134. a nut end cap; 14. a rotary encoder; 141. encoding a static disc; 142. a coding moving disc;

2. a parking brake device; 21. a second cylinder block assembly; 211. a second cylinder body; 212. a second front end cap; 213. a second rear end cap; 2131. a first through hole; 22. an electromagnetic clutch; 221. an electromagnetic stationary disk; 222. an electromagnetic moving disk; 23. a second connecting member; 24. a connecting shaft; 241. a first connection fitting portion; 2411. a third mating surface; 2412. a fourth mating surface; 25. an overrunning clutch; 26. a second transmission member; 261. a second drive nut; 262. a second drive screw; 2621. a transmission section; 2622. a second guide portion; 2623. a first acting part; 27. an elastic component; 271. an acting element; 2711. a first function engagement portion; 2712. a second acting part; 272. a first elastic member; 28. a locking assembly; 281. a fixing member; 2811. a second through hole; 2812. a third through hole; 282. a first stopper; 2821. a stop engagement portion; 2822. a second guide fitting portion; 283. a second stopper; 2831. a stopper portion; 284. a second elastic member; 285. a pulling member;

3. a load measuring assembly; 31. a load sensor; 32. a slider.

Detailed Description

The technical solutions in the embodiments of the present invention will be fully described in detail below with reference to the accompanying drawings. It is obvious that the described embodiments are only some specific embodiments, not all embodiments, of the general technical solution of the present invention. All other embodiments, which can be derived by a person skilled in the art from the general idea of the invention, fall within the scope of protection of the invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to 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, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

It should be particularly noted that, for facilitating understanding of the technical solution of the present invention, in the present embodiment, referring to fig. 2, a rotation direction is viewed from right to left, and the external thread of the first driving screw is left-handed, and the second driving screw is right-handed, which are taken as examples for explanation. If the rotating directions of the first transmission screw rod and the second transmission screw rod are changed, the rotating directions and the motion relations of the parts and the components which are matched with the first transmission screw rod and the second transmission screw rod are correspondingly changed.

It should be further specifically noted that the parking brake state referred to in the present invention refers to that when the rail train stops running, the parking brake device drives the brake device to apply parking brake force to the brake caliper; the parking release state refers to that when the rail train stops running, the braking device drives the parking braking device to release the parking braking force applied to the braking clamp; the common braking state is that when the rail train runs, the parking braking device does not act, and the braking device applies braking force to the braking clamp; the common release state refers to that when the rail train runs, the parking brake device does not act, and the brake device releases the brake force applied to the brake clamp; the manual release state refers to that when the rail train stops running, the parking brake device is manually released to drive the brake device to apply parking brake force to the brake clamp; the failure braking state refers to that when the rail train fails or the braking device fails and loses power, the parking braking device drives the braking device to apply emergency braking force to the braking clamp.

Aiming at the technical problems that the existing electromechanical brake device does not have a parking function and cannot be applied to the electromechanical brake device, the invention provides the electromechanical brake cylinder with the parking function. The following describes the technical solution of the electromechanical brake cylinder with parking function according to the present invention with reference to specific embodiments.

The embodiment provides an electromechanical brake cylinder with parking function, which comprises

Braking device 1, braking device 1 includes:

a first cylinder block assembly 11;

the first transmission assembly 13 penetrates through the first cylinder assembly 11, the first transmission assembly 13 is connected with the first cylinder assembly 11, and the first transmission assembly 13 is provided with a first connecting part 1321;

parking brake device 2, parking brake device 2 includes:

the second cylinder body assembly 21, the second cylinder body assembly 21 is connected with the first cylinder body assembly 11 horizontally;

a second transmission assembly 26, wherein the second transmission assembly 26 is connected in the second cylinder assembly 21;

the connecting shaft 24 is located in the second cylinder assembly 21, the connecting shaft 24 is located between the first transmission assembly 13 and the second transmission assembly 26, the connecting shaft 24 is connected with the second transmission assembly 26, the connecting shaft 24 is provided with a first connecting matching portion 241, and the first connecting matching portion 241 is transversely connected with the first connecting portion 1321.

The electromechanical brake cylinder with the parking function provided by the embodiment comprises a brake device 1 and a parking brake device 2, wherein the brake device 1 comprises a first cylinder assembly 11 and a first transmission assembly 13, the first transmission assembly 13 is located in the first cylinder, and the first transmission assembly 13 is provided with a first connecting part 1321; the parking brake device 2 comprises a second cylinder assembly 21, a second transmission assembly 26 and a connecting shaft 24, the second cylinder assembly 21 is transversely connected with the first cylinder assembly 11, the second transmission assembly 26 is located in the second cylinder, the connecting shaft 24 is connected with the second transmission assembly 26, the connecting shaft 24 is provided with a first connecting matching portion 241, and the first connecting matching portion 241 is transversely clamped and connected with the first connecting portion 1321. The electromechanical brake jar of function is parked in area that this embodiment provided, with arresting gear 1 and the 2 horizontal transverse connection of parking arresting gear, arresting gear 1 drives the second drive assembly 26 with the mutual transverse connection of first drive assembly 13 through first drive assembly 13, realizes electromechanical braking's the function of parking, and compact structure can guarantee less vehicle bottom occupation space, satisfies the demand of rail train lightweight, miniaturization. Specifically, referring to fig. 2, the electromechanical brake cylinder with parking function provided in the present embodiment includes a brake device 1 and a parking brake device 2, and the brake device 1 and the parking brake device 2 are transversely connected.

The braking device 1 provides braking force for the rail train and can relieve the braking force. The brake device 1 of the present embodiment is preferably an electromechanical brake device 1. The braking device 1 provided by the embodiment comprises a first cylinder assembly 11, a motor 12, a first transmission assembly 13 and a rotary encoder 14 assembly, wherein the first cylinder assembly 11 is transversely connected with the parking braking device 2, the motor 12 is connected in the first cylinder assembly 11, the first transmission assembly 13 is in transmission connection with the motor 12, and the rotary encoder 14 assembly is connected between the first transmission assembly 13 and the first cylinder assembly 11.

More specifically, the first cylinder assembly 11 serves to protect and support the brake device 1. In order to facilitate the adjustment of the brake device 1, the first cylinder assembly 11 is provided separately. The first cylinder assembly 11 includes a first cylinder body 111, a first rear end cap 112, and a first front end cap 113. For convenience of processing and adjustment, the first cylinder body 111 is integrally formed with the first rear end cap 112. The first transmission assembly 13 passes through the first rear end cover 112 and is connected with the second rear end cover in a relative rotation manner through a bearing. In order to improve the stability of the first transmission assembly 13 during rotation, there may be a plurality of bearings. First rear end housing 112 still is connected with parking arresting gear 2, and parking arresting gear 2 transversely sets up with first rear end housing 112, guarantees less vehicle bottom occupation space, improves compact structure nature.

The first front end cover 113 is connected with the first cylinder body 111, the first front end cover 113 is provided with a first guide portion 1131, the first transmission assembly 13 passes through the first front end cover 113, the first transmission assembly 13 is connected with the first front end cover 113 through the first guide portion 1131 in a relatively movable manner, and the first guide portion 1131 plays a role in guiding the movement of the first transmission assembly 13. The first guide portion 1131 may have a guide pin structure, a flat key structure, or a spline structure, and may also have other structures capable of performing a guiding function.

The motor 12 is used for providing braking and relieving power for the braking device 1. The motor 12 includes a stator 121 and a rotor 122, when the motor is powered on, the rotor 122 rotates or reversely rotates relative to the stator 121, the stator 121 is installed in the first cylinder body 111, the rotor 122 is connected with the first transmission assembly 13, and the rotor 122 drives the first transmission assembly 13 to move when moving.

The first transmission assembly 13 is used for transmitting the movement of the rotor 122 of the motor 12, and applying and relieving the braking force. Specifically, the first transmission assembly 13 includes a first transmission screw 132 and a first transmission nut 133, and the first transmission screw 132 is rotatably connected to the first rear end cover 112 through a bearing. The first transmission assembly 13 further includes a first connecting member 131, the first connecting member 131 is sleeved between the rotor 122 and the first transmission screw 132, and the rotor 122 drives the first transmission screw 132 to rotate through the first connecting member 131. In order to improve the transmission stability of the motor 12, one end of the first connecting piece 131 is rotatably connected with the first front end cover 113 through a bearing, and the other end of the first connecting piece 131 is rotatably connected with the first rear end cover 112 through a bearing, so that the rotation stability of the first connecting piece 131 is improved, the transmission stability of the first transmission screw 132 is improved, and the output stability of the braking force of the braking device 1 is further improved.

The first drive nut 133 is drivingly interconnected to the first drive screw 132, and illustratively, the first drive screw 132 is right-hand. Referring to fig. 3, the first transmission nut 133 passes through the first front end cover 113, the first transmission nut 133 is provided with a first guiding matching portion 1332, and the first guiding matching portion 1332 is matched with the first guiding portion 1131, so that the first front end cover 113 and the first transmission nut 133 are connected in a relatively movable manner. More specifically, the first guide engaging portion 1332 may be a guide pin structure, a flat key structure or a spline structure that engages with the first guide portion 1131, or may be other structures that can perform a guide engaging function. The first transmission nut 133 is further provided with a first limiting portion 1331, the first limiting portion 1331 is an annular protruding structure, and the first limiting portion 1331 is located on the outer side of the first front end cover 113 and used for limiting the position of the first transmission nut 133. In order to protect the first transmission screw 132, a nut end cover 134 is further arranged at the end of the first transmission screw 132, the first transmission screw 132 is located in the first transmission nut 133, and the nut end cover 134 covers the end of the first transmission nut 133 to protect the first transmission screw 132.

When the first transmission screw 132 rotates clockwise, the first transmission nut 133 moves towards the inner side of the first front end cover 113 under the action of the first guide portion 1131, that is, moves towards the direction away from the brake caliper, so that the release is realized; when the first transmission screw 132 rotates counterclockwise, the first transmission nut 133 moves outward of the first front end cap 113, i.e., in the direction of the brake caliper, by the first guide portion 1131, thereby achieving braking.

In order to realize the linkage between the brake apparatus 1 and the parking brake apparatus 2, referring to fig. 4, the first driving screw 132 is provided at an end thereof with a first connection portion 1321, and the first connection portion 1321 is used for connecting with the parking brake apparatus 2. Preferably, the first connection portion 1321 has a fan-shaped groove structure. This section will be described in detail later.

In the electromechanical brake cylinder with parking function provided in the present embodiment, the brake device 1 is further provided with a rotary encoder 14, and the rotary encoder 14 is connected between the first transmission screw 132 and the first cylinder assembly 11. Specifically, the rotary encoder 14 includes a code stationary plate 221 and a code movable plate 222, the code stationary plate 221 is connected to the inside of the first front end cover 113, and the code movable plate 222 is connected to the first transmission screw 132 through a first connecting member 131. When the first driving screw 132 rotates, the coding movable disk 222 is driven by the first connecting piece 131 to rotate relatively to the coding fixed disk 221, so as to code, record the rotation of the first driving screw 132, and further record the compression amount of the spring of the parking brake cylinder, which will be described in detail later.

The parking brake device 2 provides parking brake force for the electromechanical brake cylinder with parking function provided in the present embodiment. Referring to fig. 2, the parking brake apparatus 2 includes a second cylinder assembly 21, a second transmission assembly 26, an overrunning clutch 25, a connecting shaft 24, an electromagnetic clutch, an elastic assembly 27, and a locking assembly 28. The second cylinder body assembly 21 and the first rear end cover 112 are transversely connected with each other, the second transmission assembly 26 is connected in the second cylinder body assembly 21, the connecting shaft 24 is connected with the second transmission assembly 26 through the overrunning clutch 25, the electromagnetic clutch is connected between the second transmission assembly 26 and the second cylinder body assembly 21, the elastic assembly 27 is sleeved on the second transmission assembly 26, and the locking assembly 28 is connected with the second cylinder body assembly 21.

In particular, the second cylinder assembly 21 serves to protect and support the parking brake 2. To facilitate the adjustment of the brake apparatus 1, the second cylinder block assembly 21 is provided separately. The second cylinder assembly 21 includes a second cylinder body, a second front end cover, and a second rear end cover. The second transmission assembly 26 passes through the second cylinder body, and the second transmission assembly 26 is connected with the second rear end cover through a bearing, so that the second transmission assembly 26 can rotate relative to the second cylinder body, that is, the second cylinder assembly 21. The second front end housing is located between second cylinder body and first rear end cap 112, and second front end housing and first rear end cap 112 transverse connection have reduced the vertical size of the electromechanical brake cylinder of the function of parking in the area that this embodiment provided, and compact structure can guarantee less vehicle bottom occupation space. The second rear end cap is connected to the second cylinder body and is further provided with a first through hole for connection to the locking assembly 28.

The second transmission assembly 26 is used for transmitting the force of the elastic assembly 27 of the parking brake cylinder and the second transmission assembly 26 of the brake cylinder, so that parking braking, relieving and the like are realized. Specifically, the second transmission assembly 26 includes a second transmission nut 261 and a second transmission screw 262, the second transmission nut 261 is rotatably connected to the second cylinder body through a bearing, the parking brake device 2 further includes a second connector 23, one end of the second transmission nut 261 is connected to the electromagnetic clutch through the second connector 23, and the other end of the second transmission nut 261 is rotatably connected to the elastic assembly 27 through a bearing.

The second drive nut 261 is drivingly interconnected to the second drive screw 262. Preferably, the second drive screw 262 is opposite to the first drive screw 132. By way of illustration, the first drive screw 132 is left-handed in this embodiment. The second lead screw 262 is movably connected to the second rear end cap, and more specifically, the second lead screw 262 is movably connected to the locking assembly 28, and the locking assembly 28 is connected to the second rear end cap. Referring to fig. 6, the second driving screw 262 is provided with a driving portion 2621, the driving portion 2621 is an external thread structure, and the driving portion 2621 is connected with the second driving nut 261 in a driving manner, so as to realize the motion transmission. The second lead screw 262 is further provided with a second guide 2622, and the second lead screw 262 is movably connected to the locking assembly 28 via the second guide 2622. Preferably, the second guide portion 2622 is an end surface disposed parallel to the second lead screw 262. The second guiding portion 2622 may also be other guiding structures, such as a guide pin structure, a flat key structure, or a spline structure. The second driving screw 262 is further provided with a first acting portion 2623, the first acting portion 2623 is an annular protrusion structure, the first acting portion 2623 is in contact with the elastic component 27, the second driving screw 262 drives the elastic component 27 to move through the first acting portion 2623, and this will be described in detail later.

The connecting shaft 24 is used for connecting the braking device 1 and the parking braking device 2, and realizes linkage of the braking device 1 and the parking braking device 2. Specifically, the connecting shaft 24 is for connection with the first connecting portion 1321 of the first transmission screw 132 and for connection with the second transmission nut 261. More specifically, referring to fig. 2 and 5, the parking brake apparatus 2 further includes a second coupling member 23, a connecting shaft 24 is disposed in the second cylinder body, the connecting shaft 24 is disposed between the first driving screw 132 and the second driving nut 261, and the connecting shaft 24 is coupled to the second driving nut 261 via the overrunning clutch 25 and the second coupling member 23. The connecting shaft 24 is provided with a first connection fitting portion 241, and the first connection fitting portion 241 is transversely connected with the first connection portion 1321 of the first transmission screw 132, so that the first transmission screw 132 and the connecting shaft 24 can be coaxially connected.

In the electromechanical brake cylinder with a parking function provided by this embodiment, when the braking device 1 operates, the stator 121 of the motor 12 is powered on, the rotor 122 rotates clockwise, the first connecting piece 131 drives the first transmission screw 132 to rotate clockwise, and the first transmission screw 132 drives the first transmission nut 133 to move in a direction away from the brake caliper under the action of the first guiding portion 1131 and the first guiding matching portion 1332, so that brake release is realized; meanwhile, the first transmission screw 132 drives the connecting shaft 24 to rotate clockwise through the first connecting portion 1321 and the first connecting matching portion 241 which are clamped and connected with each other, at this time, the overrunning clutch 25 is in a connecting state, the connecting shaft 24 drives the second transmission nut 261 to rotate clockwise through the overrunning clutch 25, the second transmission nut 261 drives the second transmission screw 262 to move, and linkage between the first transmission assembly 13 of the braking device 1 and the second transmission assembly 26 of the parking braking assembly is achieved. Conversely, when the stator 121 of the motor 12 is powered on, the rotor 122 rotates counterclockwise, the first connecting piece 131 drives the first transmission screw 132 to rotate counterclockwise, and the first transmission screw 132 drives the first transmission nut 133 to move towards the braking clamp, so as to achieve braking; meanwhile, the first transmission screw 132 drives the connecting shaft 24 to rotate counterclockwise through the first connecting portion 1321 and the first connecting matching portion 241 which are connected with each other, the overrunning clutch 25 is in an overrunning state, the connecting shaft 24 and the second transmission nut 261 rotate relatively, the second transmission nut 261 does not move, the first transmission assembly 13 of the braking device 1 is separated from the second transmission assembly 26 of the parking braking assembly, and the parking brake cylinder is not affected by the movement of the braking device 1.

When parking brake device 2 moves, when second drive screw 262 moves to keeping away from the braking clamp direction, second drive screw 262 drives second drive nut 261 and rotates to the anticlockwise emergence, freewheel clutch 25 is in connected state, second drive nut 261 drives connecting axle 24 anticlockwise rotation, connecting axle 24 drives first drive screw 132 anticlockwise rotation through first connecting portion 1321 and the first connection cooperation portion 241 of mutual block, first drive screw 132 drives first drive nut 133 and moves to the braking clamp direction, realize parking braking.

In the brake cylinder with a parking function provided by this embodiment, the first driving screw 132 is connected to the second driving screw 262 through the connecting shaft 24 and the overrunning clutch 25, so that linkage between the braking device 1 and the parking braking device 2 is realized, and meanwhile, the connection structure between the braking device 1 and the parking braking device 2 is simplified, thereby further reducing the overall structure of the brake cylinder with a parking function, and improving the structural compactness of the braking system.

Preferably, referring to fig. 4 and 5, the first connecting portion 1321 of the first driving screw 132 is a fan-shaped groove structure, the first connecting matching portion 241 of the connecting shaft 24 is a fan-shaped protrusion structure, the fan-shaped protrusion structure is connected with the fan-shaped groove structure, a central angle of the fan-shaped groove structure is greater than a central angle of the fan-shaped protrusion structure, and both side surfaces of the fan-shaped groove structure and both side surfaces of the fan-shaped protrusion structure are not in contact with each other during service braking and service release. Specifically, the central angle of the fan-shaped groove structure of the first connecting portion 1321 is α, and both side surfaces of the fan-shaped groove structure are a first mating surface 1322 and a second mating surface 1323; the central angle of the fan-shaped protrusion structure of the second connection portion is β, β < α, γ ═ α - β, and both side surfaces of the fan-shaped protrusion structure are a third mating surface 2411 and a fourth mating surface 2412.

The electromechanical brake cylinder with the parking function provided by the embodiment is released from parking to a service braking state, namely when a train runs, the brake device 1 acts, when service braking is performed, the motor 12 is powered on, the rotor 122 rotates counterclockwise, the rotor 122 drives the first transmission screw 132 to rotate counterclockwise through the first connecting piece 131, at the moment, the first matching surface 1322 of the fan-shaped groove structure and the third matching surface 2411 of the fan-shaped protrusion structure are gradually separated from each other by a mutual contact state, the separation angle is delta, the delta angle is gradually increased, and at the moment, the first transmission nut 133 moves towards a brake clamp direction under the action of the first transmission screw 132. The moving distance of the first transmission screw 132 is just enough to enable the moving distance of the braking clamp to meet the specified braking distance value, so that service braking is realized, and at the time delta < gamma, the second matching surface 1323 of the fan-shaped groove structure is not in contact with the fourth matching surface 2412 of the fan-shaped protrusion structure. That is to say, when service braking is carried out, fan-shaped groove structure and fan-shaped protruding structure's both sides all contactless for first drive screw 132 and connecting axle 24 do not take place the transmission, and the rotation of first drive screw 132 is amputated through fan-shaped groove structure and fan-shaped protruding structure, prevents to transmit second drive screw 262.

In practical application, in an initial use stage, due to the conditions of installation and adjustment reasons or brake clamp replacement and the like, the relief gap is too large, and the moving distance of the first transmission nut 133 is increased, the first transmission screw 132 is required to continue to rotate counterclockwise, that is, δ > γ is required, the second matching surface 1323 of the fan-shaped groove structure drives the connecting shaft 24 to continue to rotate counterclockwise through the fourth matching surface 2412 in contact with the second matching surface, at this time, the overrunning clutch 25 is in an overrunning state, the connecting shaft 24 and the second connecting member 23 rotate relatively, δ ═ γ is caused again, and common braking is realized.

On the contrary, when the electromechanical brake cylinder with a parking function provided by this embodiment is changed from a service braking state to a service relieving state, that is, when the brake apparatus 1 is in operation to relieve service, the motor 12 is powered on, the rotor 122 rotates clockwise, the rotor 122 drives the first transmission screw 132 to rotate clockwise through the first connecting member 131, at this time, the second fitting surface 1323 of the fan-shaped groove structure and the fourth fitting surface 2412 of the fan-shaped protrusion structure are away from each other, the first fitting surface 1322 of the fan-shaped groove structure and the third fitting surface 2411 of the fan-shaped protrusion structure approach each other, the disengagement angle δ is gradually reduced, at this time, the first transmission nut 133 moves in a direction away from the brake caliper under the action of the first transmission screw 132 to relieve braking, the movement distance of the brake caliper meets the release clearance specified value, and release is realized, when δ >0, the first mating surface 1322 is not in contact with the third mating surface 2411.

Further, in order to increase the response speed of parking brake, after the conventional relief, the angle range of the side surface where the fan-shaped groove and the fan-shaped protrusion structure approach each other is 0 ° to 15 °, and the angle range where the first engaging surface 1322 and the third engaging surface 2411 are disengaged from each other is 0< δ <15 °. Specifically, after normal relief, first mating surface 1322 and third mating surface 2411 are brought into proximity with one another; when parking braking is performed, the connecting shaft 24 is driven by the second transmission nut 261 to rotate counterclockwise, and the third fitting surface 2411 and the first fitting surface 1322 gradually approach and contact with each other, so that rotation is transmitted to the first transmission screw 132. Therefore, after normal mitigation, when the angle at which the first engaging surface 1322 and the third engaging surface 2411 are disengaged from each other is small, the response speed of parking brake can be increased.

The electromechanical brake cylinder of function is parked in area that this embodiment provided, carry out service brake and when alleviating with commonly using, do not take place the transmission between first transmission lead screw 132 and the second drive nut 261, only need arresting gear 1 to carry out service brake and alleviate commonly used promptly, parking arresting gear 2 need not the action, and arresting gear 1's action can not carry out repeated energy storage to parking arresting gear 2, can not lead to the fact the influence to parking device, the reliability and the life of parking device have further been improved, the accuracy nature and the stability of the braking operation of the electromechanical brake cylinder of function are parked in area that this embodiment provided have been improved.

In the brake cylinder with parking function provided in the present embodiment, the parking brake device 2 further includes an electromagnetic clutch for locking and releasing the movement of the second transmission assembly 26, and specifically, the electromagnetic clutch for locking and releasing the movement of the second transmission nut 261. More specifically, the electromagnetic clutch comprises an electromagnetic static disc and an electromagnetic movable disc, and the electromagnetic static disc and the electromagnetic movable disc can be closed and separated through electric control. Preferably, the electromagnetic clutch provided by the present embodiment is a normally open electromagnetic clutch. Referring to fig. 2, the electromagnetic stationary disk is connected to the second front end cover, and the electromagnetic movable disk is connected to the second driving nut 261 through the second connector 23. When the electromagnetic clutch is de-energized, the electromagnetic static disc and the electromagnetic movable disc are separated from each other, and the second transmission nut 261 can rotate; when the magnetic clutch is energized, the electromagnetic static disc and the electromagnetic dynamic disc are closed with each other, and the second transmission nut 261 is fixed and cannot rotate.

The electromechanical brake cylinder with parking function provided by the present embodiment further comprises an elastic assembly 27. The resilient assembly 27 is used to power the parking brake 2. The elastic component 27 is sleeved on the second driving screw 262, and the second driving screw 262 is abutted against the elastic component 27 through the first acting portion 2623. Specifically, referring to fig. 2, the elastic member 27 includes a first elastic member 272 and an acting member 271. The first elastic member 272 is located in the second cylinder body, and the first elastic member 272 and the second transmission nut 261 are relatively rotatably connected through a bearing. Preferably, the first elastic member 272 is a disc spring. The acting member 271 is used for interaction between the first elastic member 272 and the second driving screw 262. More specifically, the acting element 271 is a cylindrical structure, the acting element 271 is sleeved on the outer side of the second driving nut 261, and the first elastic element 272 is sleeved on the outer side of the acting element 271. The acting element 271 is provided with a first acting matching part 2711 and a second acting part 2712, the second lead screw 262 drives the acting element 271 to move through the first acting matching part 2711, and the second acting part 2712 is used for interacting with the first elastic element 272. The first acting matching part 2711 is an inward annular convex structure, the acting piece 271 is sleeved outside the second transmission screw 262, the second transmission screw 262 penetrates through the acting piece 271, the first acting matching part 2711 is in contact connection with the first acting part 2623 of the second transmission screw 262, and the second transmission screw 262 drives the acting piece 271 to further drive the first elastic piece 272 to move through the first acting part 2623 and the first acting matching part 2711. The second acting portion 2712 is an outward annular protrusion structure, the second acting portion 2712 contacts the first elastic member 272 through a bearing, the acting member 271 can drive the first elastic member 272 to move through the second acting portion 2712, and the first elastic member 272 can rotate relative to the second acting portion 2712 through the bearing.

In the electromechanical brake cylinder with a parking function provided by this embodiment, when the first driving screw 132 of the brake device 1 drives the second driving nut 261 to rotate clockwise through the connecting shaft 24, the second driving screw 262 is driven by the second driving nut 261 to move towards the direction of the brake caliper, the second driving screw 262 pulls the acting element 271 through the first acting portion 2623 and the first acting matching portion 2711 to move, the acting element 271 pulls the first elastic element 272 through the second acting portion 2712 to move, and compresses the first elastic element 272 to perform the energy storage operation of the parking brake device 2.

The electromechanical brake cylinder with parking function provided in the present embodiment can measure the compression amount of the first elastic member 272. Specifically, during the energy storage process of the parking brake apparatus 2, the first driving screw 132 rotates clockwise to drive the connecting shaft 24 and the second driving nut 261 to rotate, so as to drive the second driving screw 262 to pull the first elastic member 272. In the transmission process, the rotary encoder 14 records the rotation of the first transmission screw 132, i.e., can measure the rotation of the second transmission nut 261, and further reflects the displacement of the second transmission screw 262, i.e., the compression amount of the first elastic member 272, thereby facilitating the subsequent intelligent control of the energy storage of the parking brake device 2.

On the contrary, after compression, the first elastic member 272 applies a force to the acting member 271 through the second acting portion 2712, the acting member 271 applies a force to the second driving screw 262 through the first acting portion 2711 and the first acting portion 2623, the force is in a direction away from the brake caliper, the second driving screw 262 moves in a direction away from the brake caliper, the second driving nut 261 rotates counterclockwise under the action of the second driving screw 262, and the connecting shaft 24 drives the first driving screw 132 to rotate counterclockwise, so that the parking brake operation of the parking brake device 2 is performed.

In order to provide the parking-function electromechanical brake cylinder of the present embodiment with a manual release function in the parking brake state, the parking brake device 2 is further provided with a locking assembly 28. Specifically, the locking assembly 28 includes a fixing member 281, a first stopper 282, a second stopper 283, a second elastic member 284 and a pulling member 285, the first stopper 282 is located in the second cylinder body, the fixing member 281 is connected to the outside of the second rear cylinder head, the second stopper 283 and the second elastic member 284 are located in the fixing member 281, the second elastic member 284 is sleeved on the outside of the second stopper 283, the second stopper 283 is snap-coupled with the first stopper 282 through the fixing member 281 and the second rear cylinder head, and the pulling member 285 is connected with the second stopper 283 through the fixing member 281.

More specifically, referring to fig. 2, the first stop member 282 is located within the second cylinder body, and the first stop member 282 is relatively rotatably coupled to the second rear end cap via a bearing. The first stopper 282 has a ratchet structure, the teeth of the ratchet structure are used as the stopper-engaging portion 2821 of the first stopper 282, and the stopper-engaging portion 2821 and the second stopper 283 are engaged with each other. The ratchet shaft is hollow, a second guide matching part 2822 is arranged in the ratchet shaft, and the second guide matching part 2822 is matched with the second guide part 2622 of the second drive screw 262, preferably, the end faces are parallel to each other. The acting piece 271 is sleeved on the ratchet shaft, and the acting piece 271 can move relative to the first rotating piece and also can rotate relative to the first rotating piece.

The fixing member 281 provides a supporting and stabilizing effect for the second fixing member 281 and the second elastic member 284, and in order to further improve the convenience of installation and adjustment, preferably, the fixing member 281 may be separately disposed. The fixing piece 281 is provided with a receiving cavity therein, the fixing piece 281 is connected to the outer side of the second rear cylinder head, the fixing piece 281 is provided with a second through hole 2811, the second through hole 2811 is communicated with the first through hole, and the second stopper 283 passes through the mutually communicated first through hole and second through hole 2811 to be mutually clamped and connected with the first stopper 282 in the second cylinder block assembly 21. The fixing member 281 is further provided with a third through hole 2812, and the pulling member 285 is connected to the second stopper 283 through the third through hole 2812.

The second stopper 283 is located in the receiving cavity of the fixing member 281, the second stopper 283 abuts against the bottom of the receiving cavity, the second stopper 283 passes through the second through hole 2811 and the first through hole and extends into the second cylinder body, one end of the second stopper 283 extending into the second cylinder body assembly 21 is provided with a stopper 2831, and the stopper 2831 and the stopper matching part 2821 are mutually connected in a clamping manner to realize the stopping of the first stopper 282.

After manual release, in order to enable the second stop 283 and the first stop 282 to automatically reset and provide convenience for operation, in the electromechanical brake cylinder with parking function provided by this embodiment, the locking device further includes a second elastic member 284 and a pulling member 285, the second elastic member 284 is located in the accommodating cavity, the second elastic member 284 is sleeved on the second stop 283, and two ends of the second elastic member 284 are respectively abutted to the second stop 283 and the fixing member 281. The second stopper 283 passes through the third through hole 2812, and the pulling member 285 is connected to the second stopper 283.

When manual release is performed after parking brake, the first elastic member 272 applies parking brake force, the motor 12 is de-energized, and the electromagnetic clutch is de-energized. At this time, the pulling element 285 is pulled manually, the pulling element 285 drives the first stopper 282 to move outwards from the first through hole and the second through hole 2811, the stopper 2831 and the stopper matching part 2821 are disengaged from each other, the acting element 271, the second transmission screw 262 and the first stopper 282 simultaneously rotate clockwise under the action of the first elastic element 272, the second transmission screw 262 and the acting element 271 generate displacement in the direction away from the brake caliper, the compression amount of the first elastic element 272 is reduced, the output torque of the connecting shaft 24 is further reduced until the acting element 271 abuts against the first stopper 282, and the elastic force of the first elastic element 272 is completely borne by the first stopper 282 and the second rear end cap. Further, the output torque of the connecting shaft 24 is zero, the force applied by the first transmission lead screw 132 to the brake caliper is zero, and the brake caliper is relieved. Further, when the pulling member 285 is released, the second elastic member 284 pushes the second stopper 283 to extend into the second cylinder body through the second through hole 2811 and the first through hole, and the stopper 2831 and the stopper matching part 2821 are engaged with each other and return to the initial state.

The electromechanical brake cylinder with the parking function provided by the embodiment is further provided with a load measuring assembly 3, the load measuring assembly 3 comprises a load sensor 31 and a sliding part 32, the load sensor 31 is sleeved on the outer side of the second cylinder body 211, the sliding part 32 is sleeved on the outer side of the load sensor 31, and the sliding part 32 and the second cylinder body 211 are connected in a relative one-way moving manner towards the direction of the first cylinder body assembly 11. When the braking operation is carried out, the load sensor 31 and the sliding piece 32 are directly contacted with the supporting beam, the load applied to the brake disc by the brake clamp can be measured, and the intelligent rail train braking device has higher measurement precision and is beneficial to the intellectualization of a rail train.

The embodiment also provides a brake system, which comprises the electromechanical brake cylinder with the parking function provided by the embodiment.

In order to facilitate understanding of the technical solution of the present invention, the operation of the electromechanical brake cylinder with parking function provided in this embodiment will be further described below.

The first normal working condition is as follows: from parking brake state to release state

When the motor 12 is powered on, the rotor 122 rotates clockwise, the rotor 122 drives the first transmission screw 132 to rotate clockwise through the first connecting piece 131, and the first transmission nut 133 moves towards the direction far away from the braking clamp, so that the release is realized; meanwhile, when the first driving screw 132 drives the second driving nut 261 to rotate clockwise through the connecting shaft 24, the second driving screw 262 is driven by the second driving nut 261 to move towards the direction of the brake caliper, the second driving screw 262 pulls the acting element 271 through the first acting portion 2623 and the first acting matching portion 2711 to move, the acting element 271 pulls the first elastic element 272 through the second acting portion 2712 to move, and the first elastic element 272 is compressed, at this time, the electromagnetic clutch is powered on, and the second driving nut 261 is fixed, so that the energy storage operation of the parking brake device 2 is performed.

And (2) under a normal working condition: from a relaxed state to a service braking state

The motor 12 is powered on, the electromagnetic clutch is powered on, the rotor 122 rotates counterclockwise, the rotor 122 drives the first transmission screw 132 to rotate counterclockwise through the first connecting piece 131, at the moment, the first matching surface 1322 of the fan-shaped groove structure and the third matching surface 2411 of the fan-shaped protrusion structure are gradually separated from each other in a mutual contact state, the separation angle is delta, the delta angle is gradually increased, and at the moment, the first transmission nut 133 moves towards the direction of the brake clamp under the action of the first transmission screw 132. The travel distance of the first lead screw 132 is such that the travel distance of the brake caliper satisfies the brake distance specification value, and service braking is achieved, where δ < γ, and the second mating surface 1323 of the fan-shaped groove structure is not in contact with the fourth mating surface 2412 of the fan-shaped protrusion structure.

And (3) normal working conditions are as follows: from service braking state to service relieving state

The motor 12 is powered on, the electromagnetic clutch is powered on, the rotor 122 rotates clockwise, the rotor 122 drives the first transmission screw 132 to rotate clockwise through the first connecting piece 131, at the moment, an included angle between the second matching surface 1323 of the fan-shaped groove structure and the fourth matching surface 2412 of the fan-shaped protrusion structure is enlarged or gradually separated from each other in a contact state, the first matching surface 1322 of the fan-shaped groove structure and the third matching surface 2411 of the fan-shaped protrusion structure are close to each other, the separation angle δ is gradually reduced, at the moment, the first transmission nut 133 moves towards the direction far away from the brake caliper under the effect of the first transmission screw 132, the brake is released, the moving distance of the first transmission nut 133 enables the moving distance of the brake caliper to meet the release clearance specified value, the common release is realized, δ >0 at the moment, namely, the first matching surface 1322 is not in contact with.

And (4) under a normal working condition: from service release state to parking brake state

The motor 12 is powered off, the electromagnetic clutch is powered off, after compression, the first elastic element 272 applies a force far away from the braking clamp to the acting element 271 through the second acting part 2712, the acting element 271 applies a force far away from the direction of the braking clamp to the second transmission screw 262 through the first acting part 2711 and the first acting part 2623, the second transmission screw 262 moves far away from the direction of the braking clamp, the second transmission nut 261 rotates anticlockwise under the action of the second transmission screw 262, the third matching surface 2411 is in contact with the first matching surface 1322, the connecting shaft 24 drives the first transmission screw 132 to rotate anticlockwise, the first transmission nut 133 moves towards the direction of the braking clamp, and parking braking is realized.

The first fault condition is as follows: from parking brake state to manual release state

The motor 12 is de-energized and the electromagnetic clutch is de-energized. At this time, the pulling element 285 is pulled manually, the pulling element 285 drives the first stopper 282 to move outwards from the first through hole and the second through hole 2811, the stopper 2831 and the stopper matching part 2821 are disengaged from each other, the acting element 271, the second transmission screw 262 and the first stopper 282 simultaneously rotate clockwise under the action of the first elastic element 272, the second transmission screw 262 and the acting element 271 generate displacement in the direction away from the brake caliper, the compression amount of the first elastic element 272 is reduced, the output torque of the connecting shaft 24 is further reduced until the acting element 271 abuts against the first stopper 282, and the elastic force of the first elastic element 272 is completely borne by the first stopper 282 and the second rear end cap. Further, the output torque of the connecting shaft 24 is zero, the force applied by the first transmission lead screw 132 to the brake caliper is zero, and the brake caliper is relieved. Further, when the pulling member 285 is released, the second elastic member 284 pushes the second stopper 283 to extend into the second cylinder body through the second through hole 2811 and the first through hole, and the stopper 2831 and the stopper matching part 2821 are engaged with each other and return to the initial state.

And (4) fault working condition two: from a released state to a fault-braked state

At this time, the rail train issues a service brake command and the rotor 122 of the motor 12 is not actuated. And controlling the electromagnetic clutch to lose power, and realizing fault braking under the same action process as the normal working condition four.

Claims

1. An electromechanical brake cylinder with parking function, comprising:

a braking device, the braking device comprising:

a first cylinder assembly;

the first transmission assembly penetrates through the first cylinder body assembly, the first transmission assembly is connected with the first cylinder body assembly, and the first transmission assembly is provided with a first connecting part; the first transmission assembly includes:

the first transmission nut is connected with the first cylinder body assembly in a relatively moving mode, and the first transmission nut is in transmission connection with the first transmission screw rod;

a parking brake device, the parking brake device comprising:

a second transmission assembly connected within the second cylinder assembly; the second transmission assembly includes:

the connecting shaft is positioned in the second cylinder body assembly, positioned between the first transmission assembly and the second transmission assembly and connected with the second transmission assembly, and provided with a first connecting matching part which is transversely connected with the first connecting part; the first connecting part is of a fan-shaped groove structure, the first connecting matching part is of a fan-shaped protruding structure, the fan-shaped protruding structure is connected with the fan-shaped groove structure, the central angle of the fan-shaped groove structure is larger than that of the fan-shaped protruding structure, and the fan-shaped groove structure is not in contact with two side faces of the fan-shaped protruding structure during common braking and common relieving;

the connecting shaft is connected with the second transmission nut through the overrunning clutch;

the elastic component is sleeved on the second transmission screw rod, and the second transmission screw rod is mutually abutted with the elastic component;

a locking device, the locking device comprising:

2. Electro-mechanical brake cylinder with parking function according to claim 1, characterized in that the angular extent of the side of the scalloped groove and the scalloped protuberance structure that are adjacent to each other after normal alleviation is in the range of 0 ° to 15 °.

3. Electro-mechanical brake cylinder with parking function according to claim 1, characterized in that the elastic assembly comprises:

a first resilient member located within the second cylinder assembly;

4. Electro-mechanical brake cylinder with parking function according to claim 1, characterized in that the locking device further comprises:

the fixing piece is connected to the outer side of the second cylinder body assembly, an accommodating cavity is formed in the fixing piece, the second stop piece is located in the accommodating cavity, the fixing piece is provided with a second through hole, the second through hole is communicated with the first through hole, the second stop piece penetrates through the second through hole and the first through hole and enters the second cylinder body assembly, and the fixing piece is further provided with a third through hole;

the second elastic piece is positioned in the accommodating cavity and sleeved on the second stop piece, and two ends of the second elastic piece are respectively abutted against the second stop piece and the inner wall of the accommodating cavity;

5. Electromechanical brake cylinder with parking function according to claim 1 or 2, characterized in that the braking device further comprises:

6. Electromechanical brake cylinder with parking function according to claim 1 or 2, characterized in that the braking device further comprises:

7. Electro-mechanical brake cylinder with parking function according to claim 1 or 2, characterized by further comprising a load measuring assembly comprising:

8. A brake system comprising the parking-function-equipped electromechanical brake cylinder according to any one of claims 1 to 7.