Electromechanical brake cylinder and braking method
Technical Field
The invention relates to the technical field of railway vehicle braking, in particular to an electromechanical brake cylinder and a braking method.
Background
In the field of rail traffic braking, friction braking is an indispensable braking mode in a vehicle, and traditional friction braking modes comprise air braking and hydraulic braking, but the two braking systems are complex in composition, slow in system response, low in control precision, large in size and heavy in weight, noise pollution can be generated, and the problems of air leakage and oil leakage exist.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide an electromechanical brake cylinder and a braking method, which have high control precision and no leakage of air and oil.
In order to achieve the above purpose, an electromechanical brake cylinder is designed, the electromechanical brake cylinder comprises a connecting piece, a nut, a ball screw, a spline shaft and a shell, the connecting piece is fixedly connected with the nut, the inner side of the nut is in threaded fit with the ball screw, one end of the ball screw, which is far away from the nut, is fixedly connected with the spline shaft, a motor rotor is sleeved outside the ball screw, a resolver rotor is sleeved outside the spline shaft, the shell is correspondingly fixedly provided with the motor rotor matched with the motor stator and the resolver stator matched with the resolver rotor, a force transmission plate for bearing axial force is sleeved outside the spline shaft, the rear end of the force transmission plate is connected with a power-off brake, and an inner ring sleeve of the power-off brake is arranged outside the spline shaft.
The invention also has the following preferable technical scheme:
the nut keep away from the outside cover of connecting piece one end and be equipped with the direction shell, the casing front and back both sides all be equipped with the opening, the opening part detachably of one side links to each other with the direction shell, the opening part detachable of opposite side is connected with the apron.
The guide shell on install the dirt proof boot, the one end cover of dirt proof boot is located the guide shell outside, the other end cover is located the connecting piece outside.
One end of the spline shaft is provided with a groove for being matched and connected with the end part of the ball screw.
The spline shaft be close to the outside cover of ball one end and be equipped with the spline housing, motor rotor and spline housing outside be equipped with first breach and second breach respectively, first breach and second breach cooperate and constitute first recess, the casing inboard be equipped with the extension, extension one end detachable is connected with the bearing clamp plate, corresponding third breach and the fourth breach of being equipped with on bearing clamp plate and the extension, third breach and fourth breach cooperate and constitute the second recess that corresponds to the position of first recess, first recess and second recess between be connected with roller bearing.
The outer wall of the spline shaft is provided with a first step structure for limiting the spline housing.
The outer wall of the spline shaft is provided with a second step structure, two self-lubricating plates are clamped between the second step structure and the thrust plate, and a flat thrust bearing is clamped between the two self-lubricating plates.
The shell and the connecting piece are respectively provided with a mounting hole for being connected with an external device.
And the connecting piece and the mounting hole of the shell are internally provided with a wear-resistant sleeve.
The invention also designs a braking method, which comprises the following steps: the motor stator is electrified, so that the motor rotor rotates, the spline housing, the spline shaft and the ball screw are driven to rotate, the ball screw nut pair converts rotation into translation, the braking cylinder stretches out and draws back, the reaction force of the pushing force is transmitted to the force transmission plate through the connecting piece, the nut, the ball screw, the spline shaft and the plane thrust bearing when the braking cylinder stretches out, in the process, the rotary transformer measures angle data of the motor and feeds signals back to the controller of the motor, and accordingly the motor is controlled to enable the ball screw to stretch out and draw back.
Compared with the prior art, the invention has the advantages of simple and feasible combined structure, easy installation and disassembly, and the invention has the following advantages: the invention has compact structure, can directly replace an air brake cylinder in the original air brake system, has high response speed, high control precision, no noise, light weight and no leakage of air and oil, and can adapt to complex electromagnetic environment.
Drawings
Fig. 1 is a schematic structural view of an electromechanical brake cylinder of the present invention in one embodiment.
Fig. 2 is a cross-sectional view of an electromechanical brake cylinder of the present invention in one embodiment.
In the figure: 1. connector 2, dust cover 3, guide housing 4, motor stator 5, motor rotor 6, front end cap 7, second recess 8, thrust plate 9, housing 10, spanner bore 11, cover plate 12, resolver stator 13, inwardly disposed extension 14 of the housing, resolver rotor 15, flat thrust bearing 16, cross roller bearing 17, spline shaft 18, power loss brake 19, self-lubricating plate 20, first recess 21, spline housing 22, ball screw 23, nut 24, screw 25, socket 26, throat hoop 27, cable sheath.
Detailed Description
The construction and principles of such a device will be apparent to those skilled in the art from the following description of the invention taken in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, the connecting piece includes a straight section and a transverse section arranged at two ends of the straight section towards the same side of the straight section, and the transverse section is provided with a mounting hole for connecting with an external device. The straight section is equipped with annular convex spacing section in the middle part to the one side direction that is equipped with the transverse section, and spacing section inboard is used for coupling nut's one end to still be equipped with the screw hole in circumference in spacing section inboard. The nut is hollow cylinder section, and the both ends of cylinder section are equipped with circumference extension, are equipped with the screw hole near circumference extension department of connecting piece one end for link to each other with the connecting piece through the screw. And a groove is also arranged at the connecting section of the connecting piece and the nut, and an O-shaped ring is arranged in the groove. The nut is internally matched with the ball screw to form a ball nut screw pair. The nut outside cover be equipped with both ends open-ended direction shell, the opening that the direction shell is close to connecting piece one end has the front end housing through the screw connection in order to realize sealing. The middle part of the guide shell is provided with an extension section outwards in the circumferential direction, and the outer end of the extension section is provided with threads which are used for being connected with the shell through threaded fit and compressing a motor stator sleeved on the outer side of the ball screw. The extension section that is equipped with outward in circumference at the direction shell middle part is close to one side of connecting piece and is connected with the one end of dirt proof boot, and the outside at the spacing section of connecting piece is connected to the other end of dirt proof boot, and the both ends of dirt proof boot are fixed through the throat hoop.
The ball screw is characterized in that the outer end of the ball screw is connected with the spline shaft, a groove is formed in one end of the spline shaft, the outer end of the ball screw can be connected in the groove through key fit, a threaded hole is formed in the end portion of the outer end of the ball screw, and the groove is formed in the other end of the spline shaft so that the connection between the spline shaft and the ball screw can be further reinforced through a screw.
The spline housing is sleeved on the outer side of the spline shaft, which is close to one end of the ball screw, and a first step structure is arranged on the outer wall of the ball screw and used for limiting the spline housing. The ball screw is characterized in that a motor rotor is sleeved outside the ball screw and is adjacent to the spline housing, the motor rotor comprises a connecting section sleeved outside the ball screw and a matching section matched with the motor stator after the connecting section extends to the outer side in the axial direction, a first notch and a second notch are correspondingly arranged outside the connecting section of the motor rotor and outside the spline housing, the first notch and the second notch are matched to form a first groove, an extending section is arranged on the inner side of the shell, one end of the extending section is detachably connected with a bearing pressing plate, a third notch and a fourth notch are correspondingly arranged on the bearing pressing plate and the extending section, the third notch and the fourth notch are matched to form a second groove corresponding to the position of the first groove, and a cross roller bearing is connected between the first groove and the second groove.
The spline shaft is sleeved with a force transfer plate, a bearing is arranged between the force transfer plate and the spline shaft, a second step structure is arranged on the outer wall of the spline shaft, two self-lubricating plates are clamped between the second step structure and the thrust plate, and a flat thrust bearing is clamped between the two self-lubricating plates. The thrust plate is fixedly connected with a power-off brake sleeved at the outer end part of the spline shaft through screw connection, namely, the outer ring of the power-off brake is fixed on the force transmission plate through screws, the inner ring is installed on the spline shaft through keys, and a retainer ring is installed at the end part of the spline shaft.
The spline shaft is characterized in that a rotary transformer rotor is further arranged on the outer side of the spline shaft, and a motor rotor matched with the motor stator and a rotary transformer stator matched with the rotary transformer rotor are correspondingly and fixedly arranged on the shell. The shell is slidably and rotatably connected with the force transmission plate. The rear end of the shell is detachably connected with a cover plate through threads, a spanner hole is drilled in the surface of the cover plate, and a rubber plug is plugged in the spanner hole. And a socket is also arranged on the shell and is used for supplying power for the rotary transformer and the motor power-off brake. The shell is also provided with a mounting hole for being connected with an external device.
In a preferred embodiment, the motor is a direct torque motor.
In a preferred embodiment, the connector and the housing have a wear sleeve mounted therein in the mounting hole.
In a preferred embodiment, the dust boot is made of rubber or synthetic material.
In a preferred embodiment, the force transfer plate and the housing are provided with a threading hole, and the threading hole is internally provided with a cable jacket.
During operation, the motor stator is electrified, so that the motor rotor rotates to drive the spline housing, the spline shaft and the ball screw to rotate, the ball screw nut pair converts rotation into translation, and accordingly the braking cylinder stretches out and draws back, in the process, the rotary transformer measures angle data of the motor and feeds signals back to the controller of the motor, and accordingly the motor is controlled to enable the ball screw to stretch out and draw back.
The brake cylinder extends out, and the reaction force of the pushing force is transmitted to the force transmission plate through the connecting piece, the nut, the ball screw, the spline shaft and the plane thrust bearing.
When the electrons are cut off, the power-off brake is also cut off at the same time, so that the transmission shaft is forced to stop rotating rapidly.
The brake cylinder of the embodiment has compact structure, light weight, good protection and high brake efficiency, and the built-in structure can adapt to complex electromagnetic environment.