CN113815592A - Electromechanical brake device for railway vehicle - Google Patents
Electromechanical brake device for railway vehicle Download PDFInfo
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- CN113815592A CN113815592A CN202111235812.0A CN202111235812A CN113815592A CN 113815592 A CN113815592 A CN 113815592A CN 202111235812 A CN202111235812 A CN 202111235812A CN 113815592 A CN113815592 A CN 113815592A
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- 239000010687 lubricating oil Substances 0.000 claims description 7
- 230000033001 locomotion Effects 0.000 abstract description 26
- 238000007789 sealing Methods 0.000 description 13
- 230000006698 induction Effects 0.000 description 10
- 230000009977 dual effect Effects 0.000 description 8
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- 230000007547 defect Effects 0.000 description 1
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- 238000010030 laminating Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/746—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive and mechanical transmission of the braking action
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Abstract
The invention provides an electromechanical braking device for a railway vehicle, which solves the problems of large size and low output efficiency of the conventional brake. The device comprises a driving motor, a fixed sleeve, a planetary roller mechanism, a front shell, an output shaft and a clutch lock locking mechanism; the front shell is connected with the fixed sleeve to form a cavity; the planetary roller mechanism comprises an input shaft, two positioning rings, a roller frame and a plurality of planetary rollers; the input shaft is arranged in the cavity, the rear end of the input shaft extends out of the cavity, and the front end of the input shaft is provided with an external thread or an annular groove; the roller frame is arranged between the fixed sleeve and the input shaft; the two positioning rings are axially limited at two ends of the roller frame; the plurality of planetary rollers are arranged on the two positioning rings; the output shaft is arranged in the cavity, and the front end of the output shaft extends out of the cavity; the output shaft can realize the forward and backward movement of the non-rotating shaft; the driving motor is used for driving the input shaft to rotate and driving the N planetary rollers to rotate and revolve, and the planetary rollers drive the output shaft to move back and forth along the axial direction of the input shaft; the clutch lock locking mechanism is used for separating and locking the input shaft.
Description
Technical Field
The invention relates to the technology of an electronic mechanical brake, in particular to an electronic mechanical brake device for a rail vehicle.
Background
With the rapid development of automobile technology, the traffic flow density is continuously increased and the speed is gradually increased, so that the requirements on the safety and the reliability of the automobile are higher and higher, and whether an automobile brake system can quickly and effectively realize the brake intention of a driver in real time becomes a key problem influencing the road traffic safety.
Because the traditional hydraulic braking system is complex, the braking force needs to pass through a vacuum booster, a hydraulic pipeline and the like, the reaction speed is low, the volume is large, the arrangement and assembly difficulty on the whole vehicle is large, an electric control system is complex, the manufacturing and maintenance cost is high, and the like. The electronic mechanical brake system (EMB) not only overcomes the inherent defects of the hydraulic brake system, but also has the outstanding advantages of simple system, high brake response speed, high efficiency and the like, and has the trend of replacing the traditional hydraulic brake system at present.
At present, an EMB electromechanical brake outputs braking power through a driving mechanism to drive a motion conversion mechanism to rotate, and the motion conversion mechanism pushes a braking force output element to do non-rotation axial translation motion, so that vehicle service braking is realized. However, the conventional brake has the following problems: 1) the axial size is large, and the mounting in a narrow space at the wheel of a railway vehicle is not suitable; 2) the braking force output efficiency is low.
Disclosure of Invention
The invention provides an electromechanical braking device for a railway vehicle, aiming at solving the technical problems of larger size and lower output efficiency of the existing brake.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an electromechanical brake device for a railway vehicle, characterized in that:
the planetary roller mechanism comprises a driving motor, a fixed sleeve, a planetary roller mechanism, a front shell, an output shaft and a clutch lock locking mechanism;
the front shell is connected with the front end of the fixed sleeve to form a cavity; the cavity is filled with lubricating oil or lubricating grease;
the planetary roller mechanism comprises an input shaft, two positioning rings, a roller frame and N planetary rollers, wherein N is an integer greater than 2;
the input shaft is arranged in the cavity and is coaxial with the fixed sleeve, the rear end of the input shaft extends out of the cavity, and the front end of the input shaft is provided with an external thread or an annular groove;
the roller frame is coaxial with the fixed sleeve and is arranged between the fixed sleeve and the external thread or the annular groove of the input shaft;
the two positioning rings are axially limited at two ends of the roller frame and can rotate around the input shaft;
the N planetary rollers are arranged on the two positioning rings and are arranged along the circumferential direction of the positioning rings; the middle part of each planetary roller is matched with the external thread or the annular groove of the input shaft, and the two end parts are matched with the roller frame;
the output shaft is arranged in the cavity, the rear end part of the output shaft is fixedly connected with the front end part of the roller frame, and the front end of the output shaft extends out of the cavity;
the output shaft can realize the forward and backward movement of the non-rotating shaft, the axis of the output shaft and the axis of the input shaft are eccentrically arranged, or an anti-rotation guide assembly is arranged between the input shaft and the front shell, or the input shaft and the front shell are matched by adopting a non-circular section, or the roller frame and the fixed sleeve are matched by adopting an anti-rotation key slot or a non-circular section;
the driving motor is connected with the rear end of the input shaft and used for driving the input shaft to rotate and drive the N planetary rollers to rotate and revolve, and the planetary roller driving roller frame and the output shaft move back and forth along the axial direction of the input shaft;
the clutch lock locking mechanism is used for separating and locking the input shaft.
Furthermore, the guide assembly comprises at least one linear groove formed in the output shaft along the axial direction of the output shaft and a guide column which is arranged on the front shell and matched with the linear groove;
or the guide assembly comprises at least one linear groove axially formed in the inner wall of the front shell along the fixing sleeve and a guide column arranged on the output shaft and matched with the linear groove.
Further, the driving motor is a single motor or double motors;
the double motors comprise double stators and single rotors matched with the double stators; or the double motors comprise double stators and double rotors matched with the double stators respectively.
Furthermore, a rotor of the driving motor is of a hollow structure, and the rotor is connected with the rear end of the input shaft through a hollow rotor shaft sleeved on the fixing sleeve; a gap is arranged between the fixed sleeve and the hollow rotor shaft;
the external thread at the front end of the input shaft is a first external thread, the middle part of the planetary roller is provided with a first external annular groove or a second external thread matched with the first external thread, the two end parts of the planetary roller are provided with second external annular grooves, and the inner surface of the roller frame is provided with an internal annular groove matched with the second external annular groove;
or the annular groove at the front end of the input shaft is a first annular groove, the middle part of the planetary roller is provided with external threads matched with the first annular groove, the two end parts of the planetary roller are provided with second outer annular grooves, and the inner surface of the roller frame is provided with an inner annular groove matched with the second outer annular groove.
Furthermore, a braking force transmission shaft is arranged at the front end of the output shaft and is coaxial with the axis of the input shaft;
n is 6, 6 planetary rollers are evenly distributed along the circumference of the positioning ring.
Meanwhile, the invention also provides another electromechanical braking device for the rail vehicle, which is characterized in that:
the planetary roller mechanism comprises a driving motor, a fixed sleeve, a planetary roller mechanism, a front shell and an output shaft;
the front shell is connected with the front end of the fixed sleeve to form a cavity; the cavity is filled with lubricating oil or lubricating grease;
the planetary roller mechanism comprises an input shaft, a roller frame and N planetary rollers, wherein N is an integer greater than 2;
the input shaft is arranged in the cavity and is coaxial with the fixed sleeve, the rear end of the input shaft extends out of the cavity, and the front end of the input shaft is provided with an external thread or an annular groove;
the roller frame is coaxial with the fixed sleeve and is arranged between the fixed sleeve and the external thread or the annular groove of the input shaft, and the inner wall of the roller frame is fixedly connected with two positioning rings which are arranged at intervals;
the N planetary rollers are arranged on the two positioning rings and are arranged along the circumferential direction of the positioning rings; the middle part of each planetary roller is matched with the external thread or the annular groove of the input shaft, and the two end parts are matched with the roller frame;
the output shaft is arranged in the cavity, the rear end part of the output shaft is fixedly connected with the front end part of the roller frame and/or the positioning ring, and the front end of the output shaft extends out of the cavity;
the output shaft can realize the forward and backward movement of the non-rotating shaft, the axis of the output shaft and the axis of the input shaft are eccentrically arranged, or an anti-rotation guide assembly is arranged between the input shaft and the front shell, or the input shaft and the front shell are matched by adopting a non-circular section, or the roller frame and the fixed sleeve are matched by adopting an anti-rotation key slot or a non-circular section;
the driving motor is connected with the rear end of the input shaft and used for driving the input shaft to rotate and drive the N planetary rollers to rotate and revolve, and the planetary rollers drive the roller frame and the output shaft to move back and forth along the axial direction of the input shaft.
Further, the guide assembly comprises at least one linear groove formed in the output shaft along the axial direction of the output shaft and a guide column which is arranged on the front shell and matched with the linear groove);
or, the guide assembly comprises at least one linear groove formed in the inner wall of the front shell along the axial direction of the fixing sleeve and a guide column arranged on the output shaft and matched with the linear groove.
Further, the driving motor is a single motor or a double motor;
the double motors comprise double stators and single rotors matched with the double stators; or the double motors comprise double stators and double rotors matched with the double stators respectively.
Furthermore, the rotor of the driving motor is of a hollow structure, and is connected with the rear end of the input shaft through a hollow rotor shaft sleeved on the fixed sleeve; a gap is arranged between the fixed sleeve and the hollow rotor shaft;
the external thread at the front end of the input shaft is a first external thread, the middle part of the planetary roller is provided with a first external annular groove or a second external thread matched with the first external thread, the two end parts of the planetary roller are provided with second external annular grooves, and the inner surface of the roller frame is provided with an internal annular groove matched with the second external annular groove;
or the annular groove at the front end of the input shaft is a first annular groove, the middle part of the planetary roller is provided with an external thread matched with the first annular groove, the two end parts of the planetary roller are provided with second external annular grooves, and the inner surface of the roller frame is provided with an inner annular groove matched with the second external annular groove.
Furthermore, the front end of the output shaft is provided with a braking force transmission shaft which is coaxial with the axis of the input shaft;
n is 6, 6 planetary rollers are evenly distributed along the circumference of the positioning ring.
Compared with the prior art, the invention has the advantages that:
1. the braking device adopts the planetary roller mechanism, can realize the output of larger braking force by a smaller structure, and ensures the high-efficiency braking force output; when the input shaft is driven to rotate by the driving motor, the planetary roller is meshed with the input shaft and the roller frame at the same time, the input shaft can drive the roller frame to rotate, but the roller frame is coaxially and fixedly connected with the output shaft, the output shaft and the input shaft are eccentrically arranged, so that the roller frame cannot rotate, the roller frame and the output shaft are pushed to perform non-rotation front-back translational motion along the axis direction of the output shaft, a guide assembly can be arranged between the output shaft and a fixed sleeve, or the roller frame and the fixed sleeve are matched by adopting an anti-rotation key groove or a non-circular cross section to limit the rotation of the roller frame, so that the non-rotation front-back translational motion of the output shaft along the axis direction of the output shaft is realized, and the vehicle running braking is realized; the clutch lock locking mechanism realizes power-off self-locking to achieve the parking braking function, and integrates the service braking function and the parking braking function; and the fixed sleeve is connected with the front shell in a sealing way, so that oil lubrication sealing can be realized, and water or impurities can be prevented from entering the cavity to influence the force transmission effect.
2. The invention can adopt the roller frame to be fixedly connected with the two positioning rings, so that the planetary roller, the roller frame and the output shaft form an integrated structure, the planetary roller can only rotate but can not revolve, the threaded self-locking of the input shaft is realized, the parking braking function is realized, the service braking function and the parking braking function are integrated, the existing clutch is cancelled to realize locking, the manufacturing cost of the brake is reduced, and the volume is reduced.
3. The driving motor can be a single motor or double motors; the double motors can adopt a coaxial double-stator single-rotor or double-stator double-rotor structure, so that the redundancy of design is realized, and the reliability of the whole device is improved.
4. The rotor of the driving motor is designed to be a hollow structure, the driving motor is sleeved on the fixing sleeve, the space is fully utilized, the size of the electric electronic mechanical braking device is reduced, and miniaturization is achieved.
5. The planetary roller mechanism is used as the braking force transmission mechanism, the planetary roller adopts a ring groove structure, and the actual lead is increased, namely the equivalent lead is larger than the lead of the input shaft, so that the movement speed of the output shaft is accelerated, and the braking force is more favorably output; and can realize outputting larger braking force with a smaller structure, not only the installation is convenient, but also the high-efficiency braking force output can be ensured.
6. The electric brake device has the characteristics of compact structure, large output brake force, convenience in installation and high reliability.
7. According to the invention, the dynamic sealing structure is adopted for sealing between the output shaft and the front shell, so that the sealing property of the cavity is ensured, and the phenomenon that lubricating oil or lubricating grease in the cavity is exposed to influence the normal work of the device is avoided.
Drawings
FIG. 1 is a first schematic structural view (output shaft does not extend out of front housing) of a first embodiment of the electromechanical brake device for railway vehicles according to the present invention;
FIG. 2 is a schematic structural view of a first exemplary electromechanical brake device for railway vehicles according to the present invention (the front end of the output shaft extends out of the front housing);
FIG. 3 is an enlarged view of a portion of FIG. 1 at I;
FIG. 4 is a schematic structural view of a planetary roller mechanism (not shown) in an embodiment of the electromechanical brake device for a railway vehicle according to the present invention;
FIG. 5 is a schematic structural diagram of a driving motor in a second embodiment of the electromechanical brake device for a railway vehicle according to the present invention;
FIG. 6 is a first schematic structural view (output shaft does not extend out of front housing) of a fourth embodiment of the electromechanical brake device for railway vehicles according to the present invention;
FIG. 7 is a second schematic structural view (with the front end of the output shaft protruding out of the front housing) of a fourth exemplary embodiment of the electromechanical brake device for a railway vehicle according to the present invention;
FIG. 8 is an enlarged view of a portion of FIG. 6 at II;
FIG. 9 is a schematic structural view of a planetary roller mechanism (not shown) in the fourth embodiment of the electromechanical brake device for railway vehicles according to the present invention;
FIG. 10 is a schematic structural diagram of a drive motor in a fifth embodiment of the electromechanical brake device for a railway vehicle according to the present invention;
FIG. 11 is a schematic structural diagram of a seventh exemplary embodiment of an electromechanical brake device for a railway vehicle according to the present invention;
FIG. 12 is a schematic structural view of a planetary roller mechanism (not shown) in a seventh embodiment of the electromechanical brake device for a railway vehicle according to the present invention;
wherein the reference numbers are as follows:
1-fixed sleeve, 2-input shaft, 3-cone bearing, 4-planetary roller, 5-positioning ring, 6-roller frame, 7-output shaft, 8-front housing, 9-driving motor, 10-first screw, 11-hollow rotor shaft, 12-braking force transmission shaft, 13-rotary lip seal ring, 14-deep groove ball bearing, 15-electromagnetic brake, 16-dynamic pressure sheet, 17-sliding sleeve, 18-sensor connecting shaft, 19-stator, 20-rotor, 21-stud, 22-O-shaped ring, 23-seal ring, 24-round nut, 25-round nut locking washer, 26-friction plate, 27-shell, 28-rear chamber, 29-front chamber, 30-linear groove, 31-guide post.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
Example one
As shown in fig. 1 and 2, the electromechanical brake device for a railway vehicle according to the present embodiment includes a drive motor 9, a fixed sleeve 1, a planetary roller mechanism, a front housing 8, an output shaft 7, and a clutch lock mechanism.
The front shell 8 is connected with the front end of the fixed sleeve 1 to form a cavity, and an O-shaped ring 22 is arranged at the joint of the front shell 8 and the fixed sleeve 1; the cavity part is filled with lubricating oil or lubricating grease.
As shown in fig. 3 and 4, the planetary roller mechanism includes an input shaft 2, two positioning rings 5, a roller frame 6 and N planetary rollers 4, where N is an integer greater than 2, and N is 6 in this embodiment; the input shaft 2 is arranged in the cavity and is coaxial with the fixed sleeve 1, a conical bearing 3 is arranged between the output shaft 7 and the inner side wall of the fixed sleeve 1, the conical bearing 3 is positioned at the rear end of the cavity, a rotary lip-shaped sealing ring 13 is also arranged on the input shaft 2, and the rotary lip-shaped sealing ring 13 is positioned between the rear end surface of the conical bearing 3 and the rear end surface of the fixed sleeve 1; the rear end of the input shaft 2 extends out of the cavity and is connected with the output of the driving motor 9, and the front end of the input shaft 2 is provided with a first external thread; the roller frame 6 is coaxially arranged between the fixed sleeve 1 and the first external thread of the input shaft 2; the two positioning rings 5 are axially limited at two ends of the roller frame 6 and can rotate around the input shaft 2, specifically, the positioning ring 5 positioned at the rear end realizes axial limiting through an annular bulge on the input shaft 2, and the positioning ring 5 positioned at the front end realizes axial limiting through the rear end face of an output shaft 7 connected with the roller frame 6; the 6 planetary rollers 4 are movably connected to the two positioning rings 5 and are circumferentially arranged along the positioning rings 5, and preferably, the 6 planetary rollers 4 are uniformly distributed along the circumferences of the positioning rings 5; the middle part of each planetary roller 4 is provided with a first outer annular groove or a second outer thread matched with the first outer thread of the input shaft 2, and the inner surface of the roller frame 6 is provided with an inner annular groove matched with the second outer annular grooves at the two end parts of the planetary rollers 4; when the middle part of the planetary roller 4 is designed into a first outer annular groove, 6 planetary rollers 4 are uniformly distributed on the circumference, the difference between the adjacent planetary rollers 4 along the axial direction of the input shaft 2 is 1/N of the first external thread pitch of the input shaft 2, N is the number of the planetary rollers, the embodiment is 1/6, and the 6 planetary rollers are meshed with the first external thread of the spiral lead angle of the outer wall of the input shaft 2 in the axial direction, so that the actual lead is increased, namely the equivalent lead is greater than the lead of the input shaft, the movement speed of the output shaft is accelerated, and the output of braking force is facilitated; and a large braking force can be output with a small structure.
The output shaft 7 is arranged in the cavity, the rear end part of the output shaft is fixedly connected with the front end part of the roller frame 6 through a first screw 10, and the first screw 10 is an M3 screw; the front end of the output shaft 7 extends out of the cavity, the output shaft 7 and the axis of the input shaft 2 are eccentrically arranged, and the eccentric distance d can be designed to be 1-3 mm.
In order to ensure the sealing performance of the cavity, a dynamic sealing structure is arranged between the output shaft 7 and the front shell 8; the dynamic seal structure comprises a sliding sleeve 17 and a seal ring 23, the sliding sleeve 17 is arranged between the front shell body 8 and the output shaft 7, the seal ring 23 is arranged between the sliding sleeve 17 and the output shaft 7 and between the sliding sleeve 17 and the front shell body 8, and the influence on the normal work of the device caused by the fact that external impurities (water, dust and the like) enter the cavity is avoided. In addition, a stud 21 is provided on the front end surface of the front housing 8 to facilitate assembly with other devices.
Driving motor 9 is used for driving input shaft 2 and rotates, and then drives the 4 rotations of a N planet roller, 6 rotation driving roll frame 6 of a 6 planet roller 4 rotate, but roll frame 6 links firmly with output shaft 7 is coaxial, output shaft 7 is eccentric settings with input shaft 2, roll frame 6 is eccentric settings with input shaft 2 promptly, can make roll frame 6 unable rotate, and promote roll frame 6 and output shaft 7 along the non-rotatory back and forth translation motion of output shaft 7 axis direction, realize vehicle service braking. The translation movement of the roller frame 6 back and forth causes the chamber to be divided into a front volume 29 at the front side of the roller frame 6 and a rear volume 28 at the rear side of the roller frame 6.
The clutch lock locking mechanism is used for separating and locking the input shaft 2, and integrates the functions of service braking and parking braking.
The front end of the output shaft 7 is provided with a braking force transmission shaft 12, and the braking force transmission shaft 12 is arranged eccentrically to the axis of the output shaft 7 and is coaxial with the axis of the input shaft 2.
The braking device of the embodiment also comprises a shell 27 arranged outside the driving motor 9 and the fixed sleeve 1, and the front end of the shell 27 is connected with the front shell 8; the clutch lock locking mechanism is positioned in the shell 27 and arranged at the outer side part of the rear end of the hollow rotor shaft 11, the clutch lock locking mechanism mainly comprises an electromagnetic brake 15, a locking fixing ring, a locking outer ring, a friction plate 26 and a movable pressing plate 16, the electromagnetic brake 15 is fixed on the shell 27, one end of the movable pressing plate 16 is attached to or close to the electromagnetic brake 15, the other end of the movable pressing plate is attached to or close to the friction plate 26, a plurality of springs are arranged in the electromagnetic brake 15, one end of each spring is in contact with the electromagnetic brake 15, and the other end of each spring is in contact with the movable pressing plate 16; the other end laminating of friction disc 26 or be close to on the inner wall of locking outer lane, the outer lane and the inner circle of locking retainer plate all are provided with the spline, the inner circle spline with set up the spline meshing on hollow rotor shaft 11 outer wall, the outer lane spline meshes with the spline that sets up at the friction disc 26 inner circle, this separation and reunion lock locking mechanism accessible is to electromagnetic braking ware 15 circular telegram or outage, realizes the separation and the locking of input shaft 2 (hollow rotor shaft 11 links firmly with input shaft 2) respectively. In other embodiments, the clutch lock mechanism may also employ an existing conventional clutch.
In this embodiment, the driving motor 9 is a single motor, as shown in fig. 1, the stator 19 of the driving motor 9 is disposed on the front housing 8, in other embodiments, the stator 19 of the driving motor 9 may also be disposed on the housing 27, the rotor 20 of the driving motor 9 is a hollow structure, the rotor 20 is connected with the rear end of the input shaft 2 through the hollow rotor shaft 11 sleeved on the fixing sleeve 1, the hollow rotor shaft 11 is connected with the rear end of the input shaft 2 by a spline, and the rear end of the input shaft 2 extends out of the hollow rotor shaft 11, and is sleeved with a locking washer 25 for a round nut and a round nut 24 from front to back; a gap is provided between the fixing sleeve 1 and the hollow rotor shaft 11, and the hollow rotor shaft 11 is directly or indirectly fixed to the housing 27 by means of the deep groove ball bearing 14.
Arresting gear is still including setting up the control unit at shell 27 rear portion, control unit includes induction magnet and circuit board, the rear end tip of input shaft 2 is equipped with sensor connecting axle 18, be used for setting up induction magnet, the circuit board sets up on shell 27 and is located induction magnet 'S rear side, be equipped with the magnetism sensing element with induction magnet relative position on the circuit board, the distinguishable induction magnet of magnetism sensing element is at the power of the radial N/S level magnetic field of motion in-process, the circuit board is used for the analysis to calculate output shaft 7 translational motion' S stroke and carries out real time control.
The braking action process of the braking device of the embodiment is as follows:
during the driving process, when the driver steps on the brake pedal, driving motor 9 starts, rotor 20 drives input shaft 2 rotary motion through hollow rotor shaft 11, thereby input shaft 2 rotary motion drives a plurality of planet rollers 4 and carries out the rotation, because the roller frame 6 with a plurality of planet rollers 4 complex is connected with output shaft 7, and output shaft 7 sets up to the disalignment with the central axis of input shaft 2, then a plurality of planet rollers 4 rotate, promote roller frame 6 and output shaft 7 along the axis direction of output shaft 7 preceding translation motion, the braking force transmission shaft 12 and the vehicle braking piece fixed connection of output shaft 7 front end, thereby realize vehicle service braking.
Example two
The difference from the first embodiment is that: the driving motor 9 is a dual motor, and as shown in fig. 5, the dual motor of the present embodiment employs coaxial dual stators and single rotors, thereby achieving redundancy of design and improving reliability of the whole device. In other embodiments, the dual motor may also adopt a coaxial dual-stator and dual-rotor structure.
EXAMPLE III
The difference from the first embodiment is that: a plurality of first ring channels of equidistant are seted up to input shaft 2 front end, and the middle part of planet roller 4 is equipped with the external screw thread with first ring channel complex.
Example four
As shown in fig. 6 and 7, the electromechanical brake device for a railway vehicle according to the present embodiment includes a drive motor 9, a fixed sleeve 1, a planetary roller mechanism, a front housing 8, and an output shaft 7.
The front shell 8 is connected with the front end of the fixed sleeve 1 to form a cavity, and an O-shaped ring 22 is arranged at the joint of the front shell 8 and the fixed sleeve 1; the cavity part is filled with lubricating oil or lubricating grease.
As shown in fig. 8 and 9, the planetary roller mechanism includes an input shaft 2, a roller frame 6, and N planetary rollers 4, where N is an integer greater than 2, and N is 6 in this embodiment; the input shaft 2 is arranged in the cavity and is coaxial with the fixed sleeve 1, a conical bearing 3 is arranged between the output shaft 7 and the inner side wall of the fixed sleeve 1, the conical bearing 3 is positioned at the rear end of the cavity, a rotary lip-shaped sealing ring 13 is also arranged on the input shaft 2, and the rotary lip-shaped sealing ring 13 is positioned between the rear end surface of the conical bearing 3 and the rear end surface of the fixed sleeve 1; the rear end of the input shaft 2 extends out of the cavity and is connected with the output of the driving motor 9, and the front end of the input shaft 2 is provided with a first external thread; the roller frame 6 is coaxially arranged between the fixed sleeve 1 and the first external thread of the input shaft 2, and the inner wall of the roller frame 6 is fixedly connected with two positioning rings 5 which are arranged at intervals; the 6 planetary rollers 4 are movably connected to the two positioning rings 5 and are arranged along the circumferential directions of the positioning rings 5, so that the planetary rollers 4, the roller frame 6 and the output shaft 7 form an integrated structure, the planetary rollers 4 can only rotate and cannot revolve, the thread self-locking of the input shaft 2 is realized, and preferably, the 6 planetary rollers 4 are uniformly distributed along the circumferences of the positioning rings 5; the middle part of each planetary roller 4 is provided with a first outer annular groove or a second outer thread matched with the first outer thread of the input shaft 2, and the inner surface of the roller frame 6 is provided with an inner annular groove matched with the second outer annular grooves at the two end parts of the planetary rollers 4; when the middle part of the planetary roller 4 is designed into a first outer annular groove, 6 planetary rollers 4 are uniformly distributed on the circumference, the difference between the adjacent planetary rollers 4 along the axial direction of the input shaft 2 is 1/N of the first external thread pitch of the input shaft 2, N is the number of the planetary rollers, the embodiment is 1/6, and the 6 planetary rollers are meshed with the first external thread of the spiral lead angle of the outer wall of the input shaft 2 in the axial direction, so that the actual lead is increased, namely the equivalent lead is greater than the lead of the input shaft, the movement speed of the output shaft is accelerated, and the output of braking force is facilitated; and a large braking force can be output with a small structure.
The output shaft 7 is arranged in the cavity, the rear end part of the output shaft is fixedly connected with the front end part of the roller frame 6 through a first screw 10, and the first screw 10 is an M3 screw; the front end of the output shaft 7 extends out of the cavity, the output shaft 7 and the axis of the input shaft 2 are eccentrically arranged, and the eccentric distance d can be designed to be 1-3 mm.
In order to ensure the sealing performance of the cavity, a dynamic sealing structure is arranged between the output shaft 7 and the front shell 8; the dynamic seal structure comprises a sliding sleeve 17 and a seal ring 23, the sliding sleeve 17 is arranged between the front shell body 8 and the output shaft 7, the seal ring 23 is arranged between the sliding sleeve 17 and the output shaft 7 and between the sliding sleeve 17 and the front shell body 8, and the influence on the normal work of the device caused by the fact that external impurities (water, dust and the like) enter the cavity is avoided. In addition, a stud 21 is provided on the front end surface of the front housing 8 to facilitate assembly with other devices.
Driving motor 9 is used for driving input shaft 2 and rotates, and then drives the 4 rotations of a N planet roller, 6 rotation driving roll frame 6 of a 6 planet roller 4 rotate, but roll frame 6 links firmly with output shaft 7 is coaxial, output shaft 7 is eccentric settings with input shaft 2, roll frame 6 is eccentric settings with input shaft 2 promptly, can make roll frame 6 unable rotate, and promote roll frame 6 and output shaft 7 along the non-rotatory back and forth translation motion of output shaft 7 axis direction, realize vehicle service braking. The translation movement of the roller frame 6 back and forth causes the chamber to be divided into a front volume 29 at the front side of the roller frame 6 and a rear volume 28 at the rear side of the roller frame 6.
The front end of the output shaft 7 is provided with a braking force transmission shaft 12, and the braking force transmission shaft 12 is arranged eccentrically to the axis of the output shaft 7 and is coaxial with the axis of the input shaft 2.
The braking device of the present embodiment further includes a housing 27 disposed outside the driving motor 9 and the fixing sleeve 1, and a front end of the housing 27 is connected to the front housing 8.
In this embodiment, the driving motor 9 is a single motor, as shown in fig. 6, the stator 19 of the driving motor 9 is disposed on the front housing 8, in other embodiments, the stator 19 of the driving motor 9 may also be disposed on the housing 27, the rotor 20 of the driving motor 9 is a hollow structure, the rotor 20 is connected with the rear end of the input shaft 2 through the hollow rotor shaft 11 sleeved on the fixing sleeve 1, the hollow rotor shaft 11 is connected with the rear end of the input shaft 2 by a spline, and the rear end of the input shaft 2 extends out of the hollow rotor shaft 11, and is sleeved with a locking washer 25 for a round nut and a round nut 24 from front to back; a gap is provided between the fixing sleeve 1 and the hollow rotor shaft 11, and the hollow rotor shaft 11 is directly or indirectly fixed to the housing 27 by means of the deep groove ball bearing 14.
Arresting gear is still including setting up the control unit at shell 27 rear portion, control unit includes induction magnet and circuit board, the rear end tip of input shaft 2 is equipped with sensor connecting axle 18, be used for setting up induction magnet, the circuit board sets up on shell 27 and is located induction magnet 'S rear side, be equipped with the magnetism sensing element with induction magnet relative position on the circuit board, the distinguishable induction magnet of magnetism sensing element is at the power of the radial N/S level magnetic field of motion in-process, the circuit board is used for the analysis to calculate output shaft 7 translational motion' S stroke and carries out real time control.
The braking action process of the braking device of the embodiment is as follows:
during the driving process, when the driver steps on the brake pedal, driving motor 9 starts, rotor 20 drives input shaft 2 rotary motion through hollow rotor shaft 11, thereby input shaft 2 rotary motion drives a plurality of planet rollers 4 and carries out the rotation, because the roller frame 6 with a plurality of planet rollers 4 complex is connected with output shaft 7, and output shaft 7 sets up to the disalignment with the central axis of input shaft 2, then a plurality of planet rollers 4 rotate, promote roller frame 6 and output shaft 7 along the axis direction of output shaft 7 preceding translation motion, the braking force transmission shaft 12 and the vehicle braking piece fixed connection of output shaft 7 front end, thereby realize vehicle service braking.
EXAMPLE five
The difference from the fourth embodiment is that: the driving motor 9 is a dual motor, and as shown in fig. 10, the dual motor of the present embodiment employs coaxial dual stators and single rotors, thereby achieving design redundancy and improving reliability of the entire apparatus. In other embodiments, the dual motor can also adopt a coaxial dual-stator and dual-rotor structure,
EXAMPLE six
The difference from the fourth embodiment is that: a plurality of first ring channels of equidistant are seted up to input shaft 2 front end, and the middle part of planet roller 4 is equipped with the external screw thread with first ring channel complex.
EXAMPLE seven
The difference from the first embodiment is that: as shown in fig. 11, the output shaft 7 is provided coaxially with the input shaft 2, and a guide member is provided between the input shaft 2 and the front housing 8, so that the input shaft 2 can move forward and backward in a non-rotational axial direction. As shown in fig. 12, the guide assembly of the present embodiment includes at least one linear groove 30 opened on the output shaft 7 in the axial direction thereof and a guide post 31 provided on the fixed sleeve 1 and adapted to the linear groove 30. In other embodiments, the guide assembly comprises at least one linear groove formed in the inner wall of the fixed sleeve along the axial direction of the fixed sleeve and a guide post arranged on the output shaft and matched with the linear groove; it is also possible to use a non-circular cross-sectional fit of the input shaft 2 with the front housing 8.
Example eight
The difference from the first embodiment and the fourth embodiment is that: in order to realize miniaturization, the radial section of the roller frame 6 is non-circular, preferably, the radial section of the roller frame 6 is polygonal, the central hole of the fixed sleeve 1 is polygonal matched with the roller frame 6, and the non-rotary axial forward and backward movement of the output shaft 7 is realized. In other embodiments, at least one anti-rotation guide key may be provided on the roller frame 6, and the fixing sleeve 1 is provided with a guide groove matched with the guide key, or the roller frame 6 and the fixing sleeve 1 are in spline fit, so that the roller frame can only move linearly along the axis and cannot rotate; in order to achieve a better anti-rotation effect of the output shaft 7, the output shaft 7 and the input shaft 2 can be designed to be eccentrically arranged, and meanwhile, the roller frame 6 and the fixing sleeve 1 are matched through anti-rotation key grooves or non-circular cross sections.
The above description is only for the preferred embodiment of the present invention and does not limit the technical solution of the present invention, and any modifications made by those skilled in the art based on the main technical idea of the present invention belong to the technical scope of the present invention.
Claims (10)
1. An electromechanical brake device for a railway vehicle, characterized in that:
the planetary roller mechanism comprises a driving motor (9), a fixed sleeve (1), a planetary roller mechanism, a front shell (8), an output shaft (7) and a clutch lock locking mechanism;
the front shell (8) is connected with the front end of the fixed sleeve (1) to form a cavity; the cavity is filled with lubricating oil or lubricating grease;
the planetary roller mechanism comprises an input shaft (2), two positioning rings (5), a roller frame (6) and N planetary rollers (4), wherein N is an integer greater than 2;
the input shaft (2) is arranged in the cavity and is coaxial with the fixed sleeve (1), the rear end of the input shaft extends out of the cavity, and the front end of the input shaft is provided with an external thread or an annular groove;
the roller frame (6) is coaxial with the fixed sleeve (1) and is arranged between the fixed sleeve (1) and the external thread or the annular groove of the input shaft (2);
the two positioning rings (5) are axially limited at two ends of the roller frame (6) and can rotate around the input shaft (2);
the N planetary rollers (4) are arranged on the two positioning rings (5) and are circumferentially arranged along the positioning rings (5); the middle part of each planetary roller (4) is matched with the external thread or the annular groove of the input shaft (2), and the two end parts are matched with the roller frame (6);
the output shaft (7) is arranged in the cavity, the rear end part of the output shaft is fixedly connected with the front end part of the roller frame (6), and the front end of the output shaft extends out of the cavity;
the output shaft (7) can move back and forth in a non-rotating axial direction, the output shaft (7) and the axis of the input shaft (2) are eccentrically arranged, or an anti-rotating guide assembly is arranged between the input shaft (2) and the front shell (8), or the input shaft (2) and the front shell (8) are matched by adopting a non-circular section, or the roller frame (6) and the fixed sleeve (1) are matched by adopting an anti-rotating key groove or a non-circular section;
the driving motor (9) is connected with the rear end of the input shaft (2) and is used for driving the input shaft (2) to rotate and drive the N planetary rollers (4) to rotate and revolve, and the planetary rollers (4) drive the roller frame (6) and the output shaft (7) to move back and forth along the axial direction of the input shaft (2);
the clutch lock locking mechanism is used for separating and locking the input shaft (2).
2. The electromechanical brake device for a railway vehicle according to claim 1, wherein: the guide assembly comprises at least one linear groove (30) formed in the output shaft (7) along the axial direction of the output shaft (7) and a guide column (31) which is arranged on the front shell (8) and matched with the linear groove;
or the guide assembly comprises at least one linear groove formed in the inner wall of the front shell (8) along the axial direction of the fixing sleeve (1) and a guide column arranged on the output shaft (7) and matched with the linear groove.
3. The rail vehicle electromechanical brake device according to claim 1 or 2, characterized in that: the driving motor (9) is a single motor or double motors;
the double motors comprise double stators and single rotors matched with the double stators; or the double motors comprise double stators and double rotors matched with the double stators respectively.
4. The electromechanical brake device for a railway vehicle according to claim 3, wherein: a rotor (20) of the driving motor (9) is of a hollow structure, and the rotor (20) is connected with the rear end of the input shaft (2) through a hollow rotor shaft (11) sleeved on the fixed sleeve (1); a gap is arranged between the fixed sleeve (1) and the hollow rotor shaft (11);
the external thread at the front end of the input shaft (2) is a first external thread, the middle part of the planetary roller (4) is provided with a first external annular groove or a second external thread matched with the first external thread, the two end parts of the planetary roller (4) are provided with second external annular grooves, and the inner surface of the roller frame (6) is provided with an inner annular groove matched with the second external annular groove;
or the annular groove at the front end of the input shaft (2) is a first annular groove, the middle part of the planetary roller (4) is provided with an external thread matched with the first annular groove, the two end parts of the planetary roller (4) are provided with second external annular grooves, and the inner surface of the roller frame (6) is provided with an inner annular groove matched with the second external annular groove.
5. The electromechanical brake device for a railway vehicle according to claim 4, wherein: the front end of the output shaft (7) is provided with a braking force transmission shaft (12), and the braking force transmission shaft (12) is coaxial with the axis of the input shaft (2);
n is 6, 6 planetary rollers (4) are uniformly distributed along the circumference of the positioning ring (5).
6. An electromechanical brake device for a railway vehicle, characterized in that:
comprises a driving motor (9), a fixed sleeve (1), a planetary roller mechanism, a front shell (8) and an output shaft (7);
the front shell (8) is connected with the front end of the fixed sleeve (1) to form a cavity; the cavity is filled with lubricating oil or lubricating grease;
the planetary roller mechanism comprises an input shaft (2), a roller frame (6) and N planetary rollers (4), wherein N is an integer larger than 2;
the input shaft (2) is arranged in the cavity and is coaxial with the fixed sleeve (1), the rear end of the input shaft extends out of the cavity, and the front end of the input shaft is provided with an external thread or an annular groove;
the roller frame (6) is coaxial with the fixed sleeve (1) and is arranged between the fixed sleeve (1) and the external thread or the annular groove of the input shaft (2), and the inner wall of the roller frame (6) is fixedly connected with two positioning rings (5) which are arranged at intervals;
the N planetary rollers (4) are arranged on the two positioning rings (5) and are circumferentially arranged along the positioning rings (5); the middle part of each planetary roller (4) is matched with the external thread or the annular groove of the input shaft (2), and the two end parts are matched with the roller frame (6);
the output shaft (7) is arranged in the cavity, the rear end part of the output shaft is fixedly connected with the front end part of the roller frame (6) and/or the positioning ring (5), and the front end of the output shaft extends out of the cavity;
the output shaft (7) can move back and forth in a non-rotating axial direction, the output shaft (7) and the axis of the input shaft (2) are eccentrically arranged, or an anti-rotating guide assembly is arranged between the input shaft (2) and the front shell (8), or the input shaft (2) and the front shell (8) are matched by adopting a non-circular section, or the roller frame (6) and the fixed sleeve (1) are matched by adopting an anti-rotating key groove or a non-circular section;
the driving motor (9) is connected with the rear end of the input shaft (2) and used for driving the input shaft (2) to rotate and drive the N planetary rollers (4) to rotate and revolve, and the planetary rollers (4) drive the roller frame (6) and the output shaft (7) to move back and forth along the axial direction of the input shaft (2).
7. The electromechanical brake device for a railway vehicle according to claim 6, wherein: the guide assembly comprises at least one linear groove (30) formed in the output shaft (7) along the axial direction of the output shaft (7) and a guide column (31) which is arranged on the front shell (8) and matched with the linear groove;
or the guide assembly comprises at least one linear groove formed in the inner wall of the front shell (8) along the axial direction of the fixing sleeve (1) and a guide column arranged on the output shaft (7) and matched with the linear groove.
8. The rail vehicle electromechanical brake apparatus according to claim 6 or 7, wherein: the driving motor (9) is a single motor or double motors;
the double motors comprise double stators and single rotors matched with the double stators; or the double motors comprise double stators and double rotors matched with the double stators respectively.
9. The electromechanical brake device for a railway vehicle according to claim 8, wherein: a rotor (20) of the driving motor (9) is of a hollow structure, and the rotor (20) is connected with the rear end of the input shaft (2) through a hollow rotor shaft (11) sleeved on the fixed sleeve (1); a gap is arranged between the fixed sleeve (1) and the hollow rotor shaft (11);
the external thread at the front end of the input shaft (2) is a first external thread, the middle part of the planetary roller (4) is provided with a first external annular groove or a second external thread matched with the first external thread, the two end parts of the planetary roller (4) are provided with second external annular grooves, and the inner surface of the roller frame (6) is provided with an inner annular groove matched with the second external annular groove;
or the annular groove at the front end of the input shaft (2) is a first annular groove, the middle part of the planetary roller (4) is provided with an external thread matched with the first annular groove, the two end parts of the planetary roller (4) are provided with second external annular grooves, and the inner surface of the roller frame (6) is provided with an inner annular groove matched with the second external annular groove.
10. The electromechanical brake device for a railway vehicle according to claim 9, wherein: the front end of the output shaft (7) is provided with a braking force transmission shaft (12), and the braking force transmission shaft (12) is coaxial with the axis of the input shaft (2);
n is 6, 6 planetary rollers (4) are uniformly distributed along the circumference of the positioning ring (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111235812.0A CN113815592A (en) | 2021-10-22 | 2021-10-22 | Electromechanical brake device for railway vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111235812.0A CN113815592A (en) | 2021-10-22 | 2021-10-22 | Electromechanical brake device for railway vehicle |
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| CN113815592A true CN113815592A (en) | 2021-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111235812.0A Pending CN113815592A (en) | 2021-10-22 | 2021-10-22 | Electromechanical brake device for railway vehicle |
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