CN219809311U - Be applied to electric switch machine electromagnetic friction coupling of (a) - Google Patents

Abstract

The utility model discloses an electromagnetic friction coupler applied to an electric switch machine, which comprises a coupler main body structure and an iron core; the main structure of the coupler comprises a coupler cover, a gear and a coupler shell which are connected in sequence; the center of the inner cavity of the main body structure of the connector is pivoted with a connector shaft; the cavity at the rear end of the connector shell is pivoted with an iron core; the inner cavity of the gear is provided with a gear groove; an armature is arranged in the gear groove; an inner friction plate and an outer friction plate are arranged behind the armature; the outer sides of the armature iron and the outer friction plate are in linkage connection with a gear groove of the gear in the circumferential direction; the left end of the coupler shaft is provided with a plurality of spline shaft shoulders; the inner side of the inner friction plate is in linkage connection with the outer side of the coupler shaft in the circumferential direction; front end inner cavity of iron core an electromagnetic coil is provided. The utility model can effectively solve the problems of abrasion and impact caused by the influence of inertia force after the motor of the electric switch machine is powered off, and improves the stability and reliability of the friction coupling.

Description

Electromagnetic friction coupler applied to electric switch machine

Technical Field

The utility model relates to the technical field of railway signal foundation, in particular to an electromagnetic friction coupler applied to an electric switch machine.

Background

The electric switch machine is an important signal basic device for railway operation, and has the main functions of changing the switch opening direction, ensuring the normal operation of the vehicle, correctly reflecting the switch position and ensuring the railway driving safety.

The friction coupler is an important transmission part of the electric switch machine, when the rotation torque required by the coupler shaft is smaller than the external gear torque, the transmission of the torque between the external gear and the coupler shaft is realized by the friction force of the internal and external friction plates in the friction coupler, and when the rotation torque required by the coupler shaft is larger than the gear torque, the internal and external friction plates in the friction coupler generate relative rotation motion, namely friction starts to play a role in protecting a motor.

The friction coupling is used for realizing the transmission connection between the motor gear box and the ball screw of the switch machine. In a switch machine, a ball screw is used to power the switch machine operation, and torque transmission from a motor to the ball screw can be controlled by a coupler shaft. The external gear of the friction coupler is matched with the gear of the motor gear box, the external gear is in transmission connection with the internal gear of the motor gear box, the motor gear box provides power, and the gear connection provides power for the friction coupler. And the coupler shaft is used for realizing the function of torque transmission of the external friction coupler gear and the ball screw.

The inner friction plate and the outer friction plate of the friction coupling of the existing point switch are usually combined by providing pressure through a spring and a pressure spring structure, the pressure provided by the spring and the pressure spring structure is constant, the pressure exists between the inner friction plate and the outer friction plate all the time, in the action process of the electric point switch, when a motor of the electric point switch is powered off, an external gear continues to rotate under the action of inertia force to drive a friction coupling shaft to continue rotating, when the required rotation torque of the coupling shaft is larger than that of the external gear, the friction force between the inner friction plate and the outer friction plate is constant, the inner friction plate and the outer friction plate in the friction coupling generate relative rotation movement, namely friction is started, and when the inner friction plate and the outer friction plate relatively rotate, the abrasion of the inner friction plate and the outer friction plate can reduce the compression amount of the spring in the friction coupling, so that the pressure of the spring is reduced, and the friction force between the inner friction plate and the outer friction plate is insufficient.

The motor of the electric switch machine provides power for the switch machine, and the motor is connected with a motor gear box to drive the motor gear box to rotate. And the motor gear box gear is in fit connection (i.e., meshed connection) with the external gear of the friction coupling.

Therefore, the structural design of the friction connector of the existing switch machine can lead key parts such as an inner friction plate, an outer friction plate and the like in the switch machine to be subjected to additional impact and abrasion after the motor of the electric switch machine is powered off, and the reliability and the stability of the switch machine are affected to a certain extent;

at present, there is an urgent need to develop a technology capable of solving the above-mentioned technical problems to improve the reliability and stability of the electric switch machine.

Disclosure of Invention

The utility model aims at overcoming the technical defects in the prior art and provides an electromagnetic friction coupler applied to an electric switch machine.

To this end, the present utility model provides an electromagnetic friction coupling applied to an electric switch machine, comprising a coupling body structure and an iron core;

the main body structure of the coupler comprises a coupler cover, a gear and a coupler shell which are sequentially connected from front to back;

the center of the inner cavity of the coupler cover, the gear and the coupler shell is pivoted with a longitudinally distributed coupler shaft;

an iron core is pivoted in the cavity at the rear end of the connector shell;

the front end of the coupler shell is provided with a plurality of return springs in a surrounding manner;

the inner cavity of the gear is provided with a gear groove;

An annular armature is arranged in the gear groove;

at least one outer friction plate and at least one inner friction plate are arranged right behind the armature;

the outer friction plate and the inner friction plate are alternately arranged front and back;

the outer side of the outer friction plate is in linkage connection with a gear groove of the gear in the circumferential direction;

the left end of the coupler shaft is circumferentially provided with a plurality of spline shaft shoulders protruding outwards;

the first bearing and the second bearing are arranged on the front side and the rear side of the spline shaft shoulder;

the armature, the inner friction plate and the outer friction plate are arranged outside the spline shaft shoulder of the coupler shaft;

the inner sides of the armature and each inner friction plate are respectively connected with the outer side of the coupler shaft in a linkage way in the circumferential direction;

the front ends of the plurality of return springs are contacted with the rear side of the inner friction plate or the outer friction plate at the rearmost part;

an electromagnetic coil is arranged in the inner cavity of the front end of the iron core.

Preferably, the coupler cover and the inner cavity wall of the coupler housing are provided with a first bearing and a second bearing, respectively;

the inner rings of the first bearing and the second bearing are connected with the left end and the middle part of the coupler shaft.

Preferably, a plurality of outer protruding parts of the outer friction plate which are distributed at equal intervals are circumferentially arranged on the outer side of the periphery of the outer friction plate;

A plurality of limiting grooves distributed at equal intervals are circumferentially arranged on the inner side of the gear groove;

a plurality of outer protrusions of the outer friction plate, respectively corresponding to the positions of the plurality of limit grooves;

each outer friction plate outer protruding part is respectively and correspondingly positioned in one limiting groove;

the shape and the size of the outer protruding part of the outer friction plate are correspondingly matched with those of the limit groove.

Preferably, a plurality of armature inner protruding parts distributed at equal intervals are circumferentially arranged on the inner side of the central through hole of the armature;

an armature notch is respectively arranged between any two adjacent armature inner protruding parts;

a plurality of inner friction plate inner protruding parts distributed at equal intervals are circumferentially arranged on the inner side of the central through hole of the inner friction plate;

an inner friction plate notch is respectively arranged between any two adjacent inner protruding parts;

the spline shaft shoulders correspond to the gaps of the internal friction plates;

each spline shaft shoulder is respectively and correspondingly positioned in an inner friction plate notch and an armature notch;

the shape and the size of each spline shaft shoulder are correspondingly matched with the shape and the size of the notch of the inner friction plate and the notch of the armature iron.

Preferably, a coupler shaft spline hole is provided inside the front end of the coupler shaft;

A coupler shaft splined bore for connecting an external transmission mechanism;

the iron core is fixed on the bottom shell of the electric switch machine.

Preferably, the coupler cover is fixedly connected with the gear and the coupler housing by a plurality of screws;

the periphery of the coupler cover is provided with a plurality of first screw through holes at equal intervals;

the gear is provided with a second screw through hole at a position corresponding to each first screw through hole on the coupler cover;

the coupler shell is provided with a threaded connecting hole at a position corresponding to each first screw through hole on the coupler cover;

each screw penetrates through the corresponding first screw through hole and the corresponding second screw through hole in sequence and then is correspondingly connected with one threaded connecting hole.

Preferably, an annular spring pad and a flat pad are arranged between the nut of each screw and the front side surface of the coupler cover;

the elastic pad and the flat pad are sleeved on the screw rod of the screw;

the nuts of the plurality of screws and the front side surface of the coupler cover are provided with a first O-shaped sealing ring;

the first O-shaped sealing ring is provided with screw through holes at positions corresponding to the screws of each screw respectively;

a second O-shaped sealing ring is arranged between the rear side surface of the gear and the front side surface of the coupler shell;

The second O-shaped sealing ring is provided with screw through holes at positions corresponding to the screws of each screw respectively;

each screw penetrates through a first screw through hole on the coupler cover, a screw through hole on the first O-shaped sealing ring, a second screw through hole on the gear and a screw through hole on the second O-shaped sealing ring, which correspond to the positions, and then is correspondingly connected with a threaded connection hole on the coupler shell.

Preferably, the front end of the coupler housing is circumferentially provided with a plurality of return spring mounting holes of which front sides are open;

a reset spring is arranged in each reset spring mounting hole;

the inner cavity wall of the coupler cover is provided with a first bearing mounting step hole;

the inner cavity wall of the coupler shell is provided with a second bearing installation step hole;

the first bearing mounting step hole and the second bearing mounting step hole are respectively provided with a first bearing and a second bearing;

the front end of the inner cavity of the connector cover is provided with an annular framework sealing ring;

the framework sealing ring is positioned outside the front end of the coupler shaft;

the framework sealing ring is positioned in front of the first bearing.

Preferably, a cylindrical hollow iron core stepped shaft is arranged at the front end of the iron core;

the inner side of the iron core stepped shaft is provided with a cylindrical separation ring;

The inner side of the separation ring is a coupler shaft accommodating cavity;

the space between the separation ring and the iron core stepped shaft is a surrounding electromagnetic coil accommodating cavity;

an electromagnetic coil located in the electromagnetic coil receiving cavity of the core;

a rear end of the coupler shaft positioned in the coupler shaft receiving cavity;

the rear end cavity of the coupler shell is a cavity with an opening on the right side;

and the iron core stepped shaft extends into the rear end cavity of the coupler shell.

Preferably, the iron core stepped shaft at the front end of the iron core is in clearance fit with the cavity at the rear end of the coupler shell;

the coupler shaft accommodates the interior cavity in clearance fit with the rear end of the coupler shaft.

Compared with the prior art, the electromagnetic friction coupler applied to the electric switch machine has scientific structural design, can overcome the defects of the prior friction coupler, realizes electric control, effectively solves the problems of abrasion and impact caused by the influence of inertia force of transmission parts (such as an inner friction plate and an outer friction plate) after the motor of the electric switch machine is powered off, replaces the spring in the prior friction coupler with electromagnetic force to provide the pressure effect, effectively reduces the abrasion between the inner friction plate and the outer friction plate, is beneficial to improving the stability and the reliability of the friction coupler, meets the requirements of safety and high efficiency in the running process of the switch machine, and has great production practice significance.

The electromagnetic friction coupler applied to the electric switch machine has the advantages of stable structure, exquisite and ingenious appearance, convenience in operation and the like.

Drawings

Fig. 1 is a schematic perspective view of an electromagnetic friction coupling for an electric switch machine according to the present utility model;

fig. 2 is a side view of an electromagnetic friction coupling applied to an electric switch machine according to the present utility model;

fig. 3 is a front view of an electromagnetic friction coupling applied to an electric switch machine according to the present utility model;

fig. 4 shows an electric switch machine according to the present utility model a perspective exploded view of the electromagnetic friction coupling;

fig. 5 is a full sectional view of an electromagnetic friction coupling applied to an electric switch machine according to the present utility model;

fig. 6a is a front view of a friction coupling cover applied to an electromagnetic friction coupling of an electric switch machine according to the present utility model;

fig. 6b is a cross-sectional view of a friction coupling cover applied to an electromagnetic friction coupling of an electric switch machine according to the present utility model;

fig. 7a is a front view of a friction coupling housing applied to an electromagnetic friction coupling of an electric switch machine according to the present utility model;

Fig. 7b is a sectional view of a friction coupling housing applied to an electromagnetic friction coupling of an electric switch machine according to the present utility model;

FIG. 8a is a front view of a half gear structure of an electromagnetic friction coupling for an electric switch machine according to the present utility model;

FIG. 8b is a cross-sectional view taken along line A-A of FIG. 8 a;

fig. 9a is a front view of a coupler shaft in an electromagnetic friction coupler applied to an electric switch machine according to the present utility model;

FIG. 9B is a cross-sectional view taken along line B-B of FIG. 9 a;

fig. 10 is a front view of an outer friction plate in an electromagnetic friction coupling applied to an electric switch machine according to the present utility model;

FIG. 11 is a front view of an inner friction plate of an electromagnetic friction coupling for an electric switch machine according to the present utility model;

fig. 12a is a cross-sectional view of an electromagnetic coil applied to an electromagnetic friction coupling of an electric switch machine according to the present utility model;

fig. 12b is a side view of an electromagnetic coil used in an electromagnetic friction coupling of an electric switch machine according to the present utility model;

fig. 13 is a schematic perspective view of an electromagnetic coil used in an electromagnetic friction coupling of an electric switch machine according to the present utility model;

Fig. 14 is a schematic perspective view of an armature in an electromagnetic friction coupling for an electric switch machine according to the present utility model;

in the figures, 1-gear, 2-coupler housing, 3-coupler cover, 4-coupler shaft, 5-core;

6-electromagnetic coil, 7-outer friction plate, 8-inner friction plate, 9-armature, 1001-first bearing, 1002-second bearing;

11-reset spring, 121-first O-shaped sealing ring, 122-second O-shaped sealing ring, 13-screw, 14-spring pad and 15-flat pad;

16-skeleton sealing ring.

Detailed Description

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

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

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

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Referring to fig. 1 to 14, the present utility model provides an electromagnetic friction coupling applied to an electric switch machine, comprising a coupling body structure and an iron core 5;

the main body structure of the connector is provided with a plurality of connecting holes, comprises a coupler cover 3, a gear 1 and a coupler shell 2 which are sequentially connected from front to back;

a coupling cover 3, a gear 1, and a coupling housing 2, and a coupling shaft 4 longitudinally distributed (i.e., the coupling shaft 4 is rotatably provided at the coupling cover 3, the gear 1, and the coupling housing 2;

In the rear end cavity 203 of the coupler housing 2, an iron core 5 is pivotally connected (i.e., the coupler housing 2 is rotatably connected to the iron core 5);

a plurality of return springs 11 are circumferentially provided at the front end of the coupler housing 2;

the inner cavity of the gear 1 is provided with a gear groove 101;

an annular armature 9 is arranged in the gear groove 101;

directly behind the armature 9, at least one outer friction plate 7 and at least one inner friction plate 8 are arranged;

the outer friction plate 7 and the inner friction plate 8 are alternately arranged front and back;

the outer side of the outer friction plate 7 is in linkage connection with the gear groove 101 of the gear 1 in the circumferential direction, so that the outer friction plate 7 is in linkage connection with the gear 1 in the circumferential direction; the outer side of the outer friction plate 7 is also in limited connection with the gear groove 101 of the gear 1 in the axial direction, and is limited in the moving direction and position in the axial direction by the limiting groove 102 on the gear groove 101.

A plurality of spline shoulders 401 (for example, four spline shoulders 40 arranged at equal intervals) protruding outward are circumferentially provided at the left end of the coupler shaft 4;

a first bearing 1001 and a second bearing 1002 provided on both front and rear sides of the spline shaft shoulder 401;

the armature 9, the inner friction plate 8 and the outer friction plate 7 are arranged outside the spline shoulder 401 of the coupler shaft 4;

The coupling shaft 4 penetrates through the central holes of the armature 9, the inner friction plate 8 and the outer friction plate 7, wherein the shape and size of the central through holes of the armature 9 and the outer friction plate 7 are larger than those of the coupling shaft 4 with the spline shaft shoulder 401, so that the armature 9 and the outer friction plate 7 cannot rotate together when the coupling shaft 4 rotates. For example, referring to fig. 9a and 9b, the center through hole diameter of the armature 9 and the outer friction plate 7 is 2mm larger than the diameter of the outer circular arc edge of the spline shaft shoulder 401.

The armature 9 and the inner side of each inner friction plate 8 are respectively connected with the outer side of the coupler shaft 4 in a linkage way in the circumferential direction; the inner sides of the armature 9 and the inner friction plate 8 are also in limited connection with the spline shoulder 401 of the coupler shaft 4 in the axial direction, and the movement direction and position in the axial direction are limited by the spline shoulder 401.

The front ends of the plurality of return springs 11 are in contact with the rear side of the inner friction plate 8 or the outer friction plate 7 at the rearmost position (i.e., the rearmost position of the plurality of friction plates);

an electromagnetic coil 6 is arranged in the inner cavity of the front end of the iron core 5.

The friction coupling is used for realizing the transmission connection between the motor gear box and the ball screw of the switch machine. In a switch machine, a ball screw is used to power the switch machine operation, and torque transmission from a motor to the ball screw can be controlled by a coupler shaft. For the present utility model, the external gear of the friction coupling (i.e., gear 1) mates with the motor gear box gear of the switch machine, the external gear is in driving connection with the motor gear box internal gear, the motor gear box provides power, and the gear connection provides power for the friction coupling. The coupling shaft 4 is used for realizing the functions of the external friction coupling gear (namely, the gear 1) and the torque transmission of the ball screw.

In the present utility model, in particular, the first bearing 1001 and the second bearing 1002 are provided to the inner cavity walls of the coupler cover 3 and the coupler housing 2, respectively;

the inner rings of the first bearing 1001 and the second bearing 1002 are connected with the left end and the middle of the coupler shaft 4; therefore, the coupler shaft 4 can be rotated by the external force.

In the present utility model, the outer sides of the outer friction plates 7 are all connected with the gear groove 101 of the gear 1 in a linkage manner in the circumferential direction, and the specific structural design is as follows:

a plurality of outer friction plate outer protruding parts 701 (for example, four) distributed at equal intervals are circumferentially arranged on the outer side of the periphery of the outer friction plate 7;

a plurality of limiting grooves 102 distributed at equal intervals are circumferentially arranged on the inner side of the gear groove 101;

a plurality of outer friction plate outer protruding portions 701 respectively corresponding to the positions of the plurality of limit grooves 102;

each outer friction plate outer protruding part 701 is respectively and correspondingly positioned in one limiting groove 102;

in particular, the shape and size of the outer protruding part 701 of the outer friction plate are correspondingly matched with those of the limit groove 102.

In particular, the outer tab outer projection 701 is rectangular in shape.

In the present utility model, the inner sides of the armature 9 and each inner friction plate 8 are respectively connected with the outer side of the coupler shaft 4 in a linkage manner in the circumferential direction, and the specific structural design is as follows:

A plurality of armature inner protrusions 901 (for example, four) distributed at equal intervals are circumferentially arranged inside the central through hole of the armature 9;

an armature notch 902 is respectively arranged between any two adjacent armature inner protruding parts 901;

a plurality of inner friction plate inner protruding parts 801 (for example, four) distributed at equal intervals are circumferentially arranged inside the central through hole of the inner friction plate 8;

an inner friction plate notch 802 is respectively arranged between any two adjacent inner friction plate inner protruding parts 801;

the spline shaft shoulders 401 correspond in position to the inner friction plate notches 802 and the armature notches 902;

each spline shoulder 401 is located in an inner friction plate notch 802 and an armature notch 902, respectively.

In particular, the shape and size of each spline shoulder 401 are correspondingly matched with the shape and size of the inner friction plate notch 802 and the armature notch 902.

In particular, spline shoulder 401 is located inside the central through hole of armature 9 and outer friction plate 7.

In particular, the armature inner projection 901 and the inner friction plate inner projection 801 are rectangular in shape.

The armature 9, the inner friction plate 8, and the outer friction plate 7 can be freely moved, e.g., slid, axially (i.e., in the front-rear direction) on the spline shoulder 401 of the coupler shaft 4.

In the present utility model, the outer friction plate 7 is mounted on the coupler shaft 4, and the outer protrusion 701 of the outer friction plate 7 is engaged with the limit groove 102 of the gear groove 101 of the gear 1, so that the outer friction plate 7 can rotate together with the gear 1.

The inner friction plates 8 and the outer friction plates 7 are alternately mounted on the coupler shaft 4 together, and inner friction plate inner protruding portions 801 are arranged at inner holes of the inner friction plates 8 and are matched with spline shoulders 401 of the coupler shaft 4, so that the inner friction plates 8 can rotate together with the coupler shaft 4.

The coupling shaft 4 is provided with a spline shaft shoulder 401, and the spline shaft shoulder 401 is used for installing the outer friction plate 7, the inner friction plate 8 and the armature 9, and the outer friction plate 7 and the inner friction plate 8 are alternately installed;

the splined hole of the inner friction plate 8 (i.e. the inner friction plate notch 802) is matched with the splined shoulder 401 of the coupler shaft 4, so that the inner friction plate 8 rotates along with the coupler shaft 4, the outer friction plate 7, the inner friction plate 8 and the armature 9 can move freely axially on the splined shoulder 401 of the coupler shaft 4, and a first bearing 1001 and a second bearing 1002 are arranged at two ends of the coupler shaft 4;

it should be noted that, the outer edge protruding portion of the outer friction plate 7 (i.e., the outer protruding portion 701 of the outer friction plate) is limited in the limiting groove 102 of the gear 1, so that the outer friction plate 7 can rotate with the gear 1, and the outer friction plate 7 does not rotate when the coupling shaft 4 rotates (because the central through hole of the outer friction plate 7 is not clamped with the spline shoulder 401 of the coupling shaft 4);

A return spring 11 is arranged in the coupler shell 2, and the return spring 11 is kept in contact with the rearmost friction plate in the gear 1;

the first bearing 1001 and the second bearing 1002 are mounted on the coupler shaft 4.

By means of the spline shoulder 401, axial positioning of the gear 1, the coupling shaft 4 and the coupling housing 2 can be achieved.

The coupler cover 3 is mounted on the gear 1 to define the axial position of the first bearing 1001.

In the present utility model, it should be noted that the gear 1 rotates together with the outer friction plate 7, the coupler shaft 4 rotates together with the inner friction plate 8. Wherein, the edge of the bulge (namely the outer protruding part 701 of the outer friction plate) of the outer friction plate 7 can be clamped in the limit groove 102 of the gear groove 101 of the gear 1, and the outer friction plate 7 can rotate along with the gear 1; spline-type engagement is provided between the spline holes in the inner friction plates 8 (i.e. the inner friction plate notches 802) and the spline shoulders 401 on the coupler shaft 4, the inner friction plate 8 is rotatable with the coupler shaft 4.

In the utility model, the outer friction plate 7, the inner friction plate 8 and the armature 9 can move freely along the axial direction on the coupler shaft 4, the coupler shaft 4 is provided with a spline shaft shoulder 401, the axial positioning of the gear 1 is realized, and two sides of the spline shaft shoulder 401 are respectively provided with a bearing. The coupling shaft 4, the outer friction plate 7, the inner friction plate 8 and the gear 1 are matched with each other, so that the coupling shaft 4 and the gear 1 can freely rotate.

In the present utility model, in particular, a coupler shaft spline hole 402 is provided inside the front end of the coupler shaft 4;

a coupler shaft splined bore 402 for connecting an external transmission mechanism;

the coupler shaft is used for a key connection with a ball screw (i.e., an external transmission mechanism) of an externally located switch machine. In a switch machine, a ball screw is used to power the switch machine operation, and torque transmission from a motor to the ball screw can be controlled by a coupler shaft.

In the present utility model, a key groove (i.e., a coupler shaft spline hole 402) is provided in the coupler shaft 4 for being keyed with a ball screw, which provides a switching force for the switch machine.

The friction coupling is used for realizing the transmission connection between the motor gear box and the ball screw of the switch machine. In a switch machine, a ball screw is used to power the switch machine operation, and torque transmission from a motor to the ball screw can be controlled by a coupler shaft.

By applying the utility model, the external gear (namely the gear 1) of the friction coupler is matched with the gear of the motor gear box of the switch machine, the external gear is connected with the external friction plate through a spline, the external friction plate, the internal friction plate and the armature are arranged on the friction coupler shaft, the internal friction plate is connected with the coupler shaft through a spline, and the coupler shaft is connected with the ball screw through a key. When the motor of the switch machine rotates, the gear of the motor gear box of the switch machine rotates to drive the external gear to rotate, the external gear (namely the gear 1) drives the coupler shaft 4 to rotate through friction force between friction plates, and the coupler shaft drives the ball screw positioned outside to rotate, so that the function of driving the ball screw by the motor is realized. The friction coupler receives the torque transmitted by the speed reducer of the switch machine, and transmits the torque to the ball screw group through adjustable friction force, so that the torque transmitted by the friction coupler is limited through the friction force, and meanwhile, the motor of the switch machine can be prevented from being damaged due to overlarge load.

In the present utility model, the coupler cover 3 is fixedly connected to the gear 1 and the coupler housing 2 by a plurality of screws 13.

During installation, the screws 13 are coated with a fastener anti-loosening sealant to prevent the gear 1, the coupler cover 3 and the coupler housing 2 from loosening in a vibration environment.

In particular, a plurality of first screw through holes 301 are formed at equal intervals on the peripheral edge of the coupler cover 3;

the gear 1 is provided with a second screw through hole at a position corresponding to each first screw through hole on the coupler cover 3;

the coupler housing 2 is provided at a position corresponding to each first screw through hole on the coupler cover 3, a threaded connecting hole is respectively arranged;

each screw 13 penetrates through the corresponding first screw through hole and the corresponding second screw through hole in sequence and then is correspondingly connected with one threaded connecting hole.

In particular, an annular spring pad 14 and a flat pad 15 are arranged between the nut of each screw 13 and the front side surface of the coupler cover 3;

the spring pad 14 and the flat pad 15 are sleeved on the shaft of the screw 13.

In particular, the nuts of the plurality of screws 13 and the front side surface of the coupler cover 3 are provided with a first O-shaped sealing ring 121;

The first O-ring 121 is provided with screw through holes at positions corresponding to the screws of each screw 13;

a second O-ring 122 is provided between the rear side of the gear 1 and the front side of the coupler housing 2;

the second O-ring 122 is provided with screw through holes at positions corresponding to the screws of each screw 13;

each screw 13 penetrates through a first screw through hole in the coupler cover 3, a screw through hole in the first O-ring 121, a second screw through hole in the gear 1 and a screw through hole in the second O-ring 122, which correspond to the positions, and then is correspondingly connected with a threaded connection hole in the coupler housing 2.

In the present utility model, in particular, the front end of the coupler housing 2 is circumferentially provided with a plurality of return spring mounting holes 202 whose front sides are open;

one return spring 11 is disposed in each return spring mounting hole 202.

In particular, four return spring mounting holes 202 open on the front side are circumferentially provided at the front end of the coupler housing 2.

The coupling housing 2 is provided with a return spring 11, when the coil 6 is powered off, electromagnetic force disappears, and the positions of the outer friction plate 7, the inner friction plate 8 and the armature 9 are restored under the action of the return spring 11, so that abrasion of the friction plates is reduced.

In the present utility model, in particular, the inner cavity wall of the coupler cover 3 is provided with a first bearing mounting stepped hole 302;

the inner cavity wall of the coupler housing 2 is provided with a second bearing mounting stepped hole 201;

the first bearing mounting stepped hole 302 and the second bearing mounting stepped hole 201 are provided with a first bearing 1001 and a second bearing 1002, respectively.

In the utility model, in particular implementation, two inner friction plates 8 and three outer friction plates 7 are arranged right behind the armature 9;

the outer friction plates 7 and the inner friction plates 8 are alternately arranged back and forth.

In the utility model, the front end of the inner cavity of the coupler cover 3 is provided with an annular framework sealing ring 16;

a skeleton seal ring 16 located outside the front end of the coupler shaft 4;

the skeletal seal ring 16 is located in front of the first bearing 1001. Thus, the sealing action of the whole mechanism is ensured.

In the present utility model, the electromagnetic coil 6 may be constructed as a conventional electromagnetic coil. For example, referring to fig. 12b, electromagnetic coil 6 includes laterally distributed wire loops (being insulated wire loops)) 600; the outer wall of the wire loop 600 is wound with a plurality of wires, which are insulated from each other;

In the present utility model, in particular, the electromagnetic coil 6 includes a bobbin 601, and the wire loop 600 of the electromagnetic coil 6 is placed in the bobbin 601;

the front end of the iron core 5 is provided with a cylindrical hollow iron core stepped shaft 500;

the inner side of the iron core stepped shaft 500, a spacer ring 501 having a cylindrical shape;

inside spacer ring 501 is coupler shaft receiving cavity 502;

the space between the spacer ring 501 and the iron core stepped shaft 500 is a circumferentially distributed electromagnetic coil accommodating cavity 503;

a solenoid 6 located in the solenoid accommodating cavity 503 of the iron core 5;

the rear end of the coupler shaft 4 is located in the coupler shaft receiving cavity 502;

the rear end cavity 203 of the coupler housing 2 is a cavity opened on the right side;

the iron core stepped shaft 500 protrudes into the rear end cavity 203 of the coupler housing 2.

In particular, the iron core stepped shaft 500 at the front end of the iron core 5 extends into the rear end cavity 203 of the coupler housing 2 and is in clearance fit with the rear end cavity 203 of the coupler housing 2.

In particular, the coupler shaft receiving cavity 502 is a clearance fit with the rear end of the coupler shaft 4, i.e., the coupler shaft receiving cavity 502 has an inner diameter that is larger than the diameter of the rear end of the coupler shaft 4.

The electromagnetic coil 6 is fixed in the iron core 5 by a coil frame, the parameters of the electromagnetic coil are determined by the required electromagnetic force, and the lead-out wire end of the electromagnetic coil 6 adopts a winding ring mode to wind a wire ring.

For the electromagnetic coil 6, the wound coil is placed in a coil frame, the number of turns and the conductivity of the coil are determined by electromagnetic force, the coil is sealed by a polyester film after the head and the tail ends of the coil are welded, the coil is wrapped by a piece of isolating paper and a piece of varnished cloth, the outermost layer is wound with a coil of cable wire, the coil outgoing wire adopts a coil ring, and the coil frame is integrally fixed in an iron core, so that good insulation between the coil and the iron core is ensured; the structure of the electromagnetic coil 6 is a conventional electromagnetic coil structure, and will not be described herein.

The diameter of the iron core stepped shaft 500 of the iron core 5 is slightly smaller than the diameter of the rear end cavity 203 (i.e., the hollow hole) of the coupler housing 2 (e.g., a gap of 2mm is reserved), the iron core stepped shaft 500 partially extends into the coupler housing 2, and the iron core 5 and the iron core stepped shaft 500 do not rotate together with the coupler housing 2; the outer edge of the iron core 5 is provided with a wiring groove for energizing the electromagnetic coil.

The electromagnetic coil 6 is installed in the iron core 5, the electromagnetic coil is fixed in the iron core 5 through the cover plate, the iron core 5 stretches into the coupler housing 2 and does not rotate with the coupler shaft 4 (i.e. does not rotate with the friction coupler main body structure), and the iron core 5 is fixed in the electric switch machine.

In the present utility model, the iron core 5 is fixed to the bottom case of the electric switch machine so as not to rotate together with the friction coupling main body structure.

In the present utility model, the iron core 5 is engaged with the electromagnetic coil 6 to generate electromagnetic force, and the iron core 5 is made of electromagnetic pure iron.

In particular, the iron core 5 and the electric switch machine (for example, the bottom shell of the electric switch machine) are connected through a protective cover, in particular, the iron core is installed in a hollow protective cover, and then the protective cover and the switch machine are connected through bolts.

The electromagnetic coil 6 is energized with direct current, and the iron core 5 generates electromagnetic force in the electromagnetic coil 6. The electromagnetic coil generates a magnetic field, is made of copper, and is matched with the iron core to generate electromagnetic force after being electrified. The technical principle of generating electromagnetic force is a known principle, and is not described herein.

In the utility model, after the electromagnetic coil is electrified, the iron core 5 generates electromagnetic force, the electromagnetic force generates attraction force to the armature 9, and the armature 9 provides positive pressure for the outer friction plate and the inner friction plate (namely, the outer friction plate 7 and the inner friction plate 8 generate pressure for pressing towards the direction of the electromagnetic coil 6) through the electromagnetic force of the iron core 5.

In the present utility model, in particular, the iron core 5 is provided with a wiring hole (i.e., wiring slot) for energizing the electromagnetic coil 6;

In the utility model, the electromagnetic coil 6 is connected in series with the power supply circuit of the motor of the electric switch machine, thereby ensuring that the electromagnetic coil and the motor of the electric switch machine are simultaneously electrified and simultaneously powered off.

In the present utility model, when the electromagnetic coil 6 is energized, the iron core 5 generates electromagnetic force, so that the armature 9, the outer friction plate 7 and the inner friction plate 8 are tightly attracted together, that is, the armature 9 on the coupler shaft 4 and the inner and outer friction plates are tightly pressed together, so that positive pressure is provided between the outer friction plate 7 and the inner friction plate 8, and friction force is generated;

at this time, when the resistance to rotation of the coupler shaft 4 is smaller than the friction force between the inner friction plate and the outer friction plate, the gear 1 rotates, and the coupler shaft 4 rotates accordingly by virtue of the friction force between the inner friction plate and the outer friction plate; when the resistance of the rotation of the coupler shaft 4 is larger than the friction force between the inner friction plate and the outer friction plate, the gear 1 rotates, the coupler shaft 4 is not moved (namely, the coupler shaft 4 cannot rotate along with the inner friction plate due to insufficient friction force, namely, the coupler shaft 4 cannot be further driven by the friction force of the outer friction plate 7 and the inner friction plate 8), and the inner friction plate and the outer friction plate start to rub at the moment (namely, the inner friction plate and the outer friction plate generate relative rotation movement), so that the motor of the electric switch machine is protected;

In addition, because the coil and the electric switch machine are simultaneously electrified and powered off, electromagnetic force disappears when the motor is powered off, friction force between the inner friction plate and the outer friction plate is not generated, and at the moment, the gear 1 cannot drive the coupler shaft 4 to rotate under the inertia action of the motor (namely, the coupler shaft 4 cannot rotate along with the inner friction plate due to insufficient friction force), so that the influence of the inertia rotation of the motor on a mechanism is eliminated, and the reliability and the safety of a transmission part of the electric switch machine are improved.

In the present utility model, the outer friction plate is provided with a center hole for being mounted on the coupler shaft so as to be movable back and forth; the armature 9 is a circular iron ring and is arranged on the coupler shaft in a back-and-forth movable way, and an armature notch 902 on the armature 9 is in clearance fit with a spline shaft shoulder 401 on the coupler shaft 4.

In order to more clearly understand the technical scheme of the present utility model, the working principle of the present utility model is described below.

When the electric switch machine works, the motor of the electric switch machine is electrified, the electromagnetic coil 6 and the motor are electrified simultaneously to generate electromagnetic force, the armature 9 on the coupler shaft 4 generates positive pressure on the outer friction plate 7 and the inner friction plate 8 under the action of the electromagnetic force, the outer friction plate 7 and the inner friction plate 8 are extruded towards the electromagnetic coil 6, when the torque required by the rotation of the coupler shaft 4 is smaller than the torque obtained by the gear 1 (namely, the resistance of the rotation of the coupler shaft 4 is smaller than the friction force between the inner friction plate and the outer friction plate), the gear 1 rotates, friction force is generated between the outer friction plate 7 and the inner friction plate 8, the coupler shaft 4 obtains torque rotation, and the coupler shaft 4 drives other transmission parts to rotate through key connection to transmit torque; when the rotation torque required by the coupler shaft is larger than the torque obtained by the gear 1 (namely, when the resistance of the rotation of the coupler shaft 4 is larger than the friction force between the inner friction plate and the outer friction plate), the gear 1 rotates, the coupler shaft 4 is not moved, the outer friction plate 7 and the inner friction plate 8 rub against each other (namely, the inner friction plate and the outer friction plate generate relative rotation movement), and overload operation of the motor is not caused, so that the motor is protected;

In addition, when the operation of the switch machine is stopped, the motor of the electric switch machine is powered off, the electromagnetic coil 6 is powered off at the same time, the electromagnetic force disappears, the outer friction plate 7 and the inner friction plate 8 are restored to the original state, the friction force is reduced, the inertial motion of the motor only drives the gear 1 to rotate, the coupler shaft 4 is not driven to rotate (namely, the coupler shaft 4 is not further driven by the friction force of the outer friction plate 7 and the inner friction plate 8), and therefore the influence of the inertial motion is eliminated.

In the utility model, the coupler cover 2 and the coupler shell 3 are made of aluminum; the iron core 5 can be additionally provided with a base for better fixing in the switch machine;

in particular, the armature 9 is a circular iron ring, and is arranged in the gear groove 101 of the gear 1, and compresses the inner friction plate and the outer friction plate under the action of electromagnetic force.

In particular, the armature 9 is made of a material with good magnetic permeability and high density, such as an electric iron;

in particular, according to the magnitude of the conversion moment, the inner friction plate 7 and the outer friction plate 8 can be made of materials with good magnetic conductivity and wear resistance, so that attractive force can be generated, and the service life of the friction plate can be prolonged.

Compared with the prior art, the electromagnetic friction coupler applied to the electric switch machine has the following beneficial effects:

1. The electromagnetic friction coupler can replace the existing friction coupler of the switch machine, the coil of the electromagnetic friction coupler and the switch machine are simultaneously electrified and powered off, so that friction force is ensured to exist between friction plates when a motor is started, torque is transmitted, friction force is not generated between the friction plates when the motor is powered off, the rotation of a coupler shaft is not influenced by the inertia torque of the motor, the inertia influence of the motor is eliminated, and the reliability and the safety of equipment are greatly improved.

The electromagnetic friction connector has the advantages of high controllability and accuracy of friction force, high reliability, low maintenance amount, simple structure and the like, and the influence of insufficient pressure caused by the fact that gaps are generated between the inner friction plate and the outer friction plate due to abrasion is avoided because the friction force between the inner friction plate and the outer friction plate is controlled by electromagnetic force.

In summary, compared with the prior art, the electromagnetic friction coupler applied to the electric switch machine provided by the utility model has scientific structural design, can overcome the defects of the traditional friction coupler, realizes electric control, effectively solves the problems of abrasion and impact caused by the influence of inertia force of transmission parts (such as an inner friction plate and an outer friction plate) after the motor of the electric switch machine is powered off, replaces the spring in the traditional friction coupler with electromagnetic force to provide the pressure effect, effectively reduces the abrasion between the inner friction plate and the outer friction plate, is beneficial to improving the stability and the reliability of the friction coupler, meets the requirements of safety and high efficiency in the running process of the switch machine, and has great production practice significance.

The electromagnetic friction coupler applied to the electric switch machine has the advantages of stable structure, exquisite and ingenious appearance, convenience in operation and the like.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims (10)

1. An electromagnetic friction coupling for electric switches, characterized in that it comprises a coupling body structure and an iron core (5);

the main structure of the coupler comprises a coupler cover (3), a gear (1) and a coupler shell (2) which are sequentially connected from front to back;

the center of the inner cavity of the coupler cover (3), the gear (1) and the coupler shell (2) is pivoted with a longitudinally distributed coupler shaft (4);

an iron core (5) is pivoted in the rear end cavity (203) of the connector shell (2);

the front end of the coupler shell (2) is provided with a plurality of return springs (11) in a surrounding manner;

the inner cavity of the gear (1) is provided with a gear groove (101);

an annular armature (9) is arranged in the gear groove (101);

at least one outer friction plate (7) and at least one inner friction plate (8) are arranged right behind the armature (9);

The outer friction plate (7) and the inner friction plate (8) are alternately arranged front and back;

the outer side of the outer friction plate (7) is in linkage connection with a gear groove (101) of the gear (1) in the circumferential direction;

the left end of the coupler shaft (4) is circumferentially provided with a plurality of spline shaft shoulders (401) protruding outwards;

a first bearing (1001) and a second bearing (1002) which are arranged on the front side and the rear side of the spline shaft shoulder (401);

the armature (9), the inner friction plate (8) and the outer friction plate (7) are arranged outside a spline shaft shoulder (401) of the coupler shaft (4);

the inner sides of the armature (9) and each inner friction plate (8) are respectively connected with the outer side of the coupler shaft (4) in a linkage way in the circumferential direction;

the front ends of the plurality of return springs (11) are contacted with the rear side of the inner friction plate (8) or the outer friction plate (7) positioned at the rearmost;

an electromagnetic coil (6) is arranged in the inner cavity of the front end of the iron core (5).

2. An electromagnetic friction coupling for electric switches according to claim 1, characterized in that the coupling cover (3) and the inner cavity wall of the coupling housing (2) are provided with a first bearing (1001) and a second bearing (1002), respectively;

the inner rings of the first bearing (1001) and the second bearing (1002) are connected with the left end and the middle part of the coupler shaft (4).

3. The electromagnetic friction coupling for an electric switch machine according to claim 1, characterized in that a plurality of equally spaced outer friction plate protrusions (701) are circumferentially provided on the outer circumferential side of the outer friction plate (7);

A plurality of limiting grooves (102) distributed at equal intervals are circumferentially arranged on the inner side of the gear groove (101);

a plurality of outer friction plate outer protruding parts (701) respectively corresponding to the positions of the plurality of limit grooves (102);

each outer friction plate outer protruding part (701) is respectively and correspondingly positioned in one limit groove (102);

the shape and the size of the outer protruding part (701) of the outer friction plate are correspondingly matched with those of the limit groove (102).

4. An electromagnetic friction coupling for electric switches according to claim 1, characterized in that a plurality of equally spaced armature inner projections (901) are circumferentially provided inside the central through hole of the armature (9);

an armature notch (902) is respectively arranged between any two adjacent armature inner protruding parts (901);

a plurality of inner friction plate inner protruding parts (801) distributed at equal intervals are circumferentially arranged on the inner side of the central through hole of the inner friction plate (8);

an inner friction plate notch (802) is respectively arranged between any two adjacent inner protruding parts (801);

the spline shaft shoulders (401) correspond to the inner friction plate notches (802);

each spline shaft shoulder (401) is respectively and correspondingly positioned in an inner friction plate notch (802) and an armature notch (902);

The shape and the size of each spline shaft shoulder (401) are correspondingly matched with the shape and the size of the inner friction plate notch (802) and the armature notch (902).

5. An electromagnetic friction coupling for electric switch machine according to claim 1, characterized in that the inside of the front end of the coupling shaft (4) is provided with a coupling shaft splined hole (402);

a coupler shaft splined bore (402) for connecting an external transmission mechanism;

the iron core (5) is fixed on the bottom shell of the electric switch machine.

6. An electromagnetic friction coupling for electric switches, according to claim 1, characterized in that the coupling cover (3) is fixedly connected to the gear (1) and to the coupling housing (2) by means of a plurality of screws (13);

the periphery of the coupler cover (3) is provided with a plurality of first screw through holes (301) at equal intervals;

the gear (1) is provided with a second screw through hole at a position corresponding to each first screw through hole on the coupler cover (3);

the connector shell (2) is respectively provided with a threaded connection hole at a position corresponding to each first screw through hole on the connector cover (3);

each screw (13) penetrates through the corresponding first screw through hole and the corresponding second screw through hole in sequence and then is correspondingly connected with one threaded connecting hole.

7. An electromagnetic friction coupling for electric switches, according to claim 6, characterized in that between the nut of each screw (13) and the front side of the coupling cover (3) there are provided an annular spring pad (14) and a flat pad (15);

the elastic pad (14) and the flat pad (15) are sleeved on the screw rod of the screw (13);

the nuts of the plurality of screws (13) and the front side surface of the coupler cover (3) are provided with a first O-shaped sealing ring (121);

the first O-shaped sealing rings (121) are respectively provided with screw through holes at positions corresponding to the screws of the screws (13);

a second O-shaped sealing ring (122) is arranged between the rear side surface of the gear (1) and the front side surface of the coupler shell (2);

the second O-shaped sealing rings (122) are respectively provided with screw through holes at positions corresponding to the screws of the screws (13);

each screw (13) sequentially penetrates through a first screw through hole in the coupler cover (3), a screw through hole in the first O-shaped sealing ring (121), a second screw through hole in the gear (1) and a screw through hole in the second O-shaped sealing ring (122) corresponding to the positions and then is correspondingly connected with a threaded connection hole in the coupler shell (2).

8. An electromagnetic friction coupling applied to an electric switch machine according to claim 1, characterized in that the front end of the coupling housing (2) is circumferentially provided with a plurality of front-side open return spring mounting holes (202);

A return spring (11) is arranged in each return spring mounting hole (202);

the inner cavity wall of the coupler cover (3) is provided with a first bearing mounting step hole (302);

the inner cavity wall of the coupler shell (2) is provided with a second bearing installation step hole (201);

a first bearing (1001) and a second bearing (1002) are respectively arranged on the first bearing mounting step hole (302) and the second bearing mounting step hole (201);

the front end of the inner cavity of the connector cover (3) is provided with an annular framework sealing ring (16);

a framework sealing ring (16) positioned outside the front end of the coupler shaft (4);

the skeleton seal ring (16) is positioned in front of the first bearing (1001).

9. -electromagnetic friction coupling for electric switches, according to any one of claims 1 to 8, characterized in that the front end of the iron core (5) is provided with a cylindrical, hollow iron core stepped shaft (500);

the inner side of the iron core stepped shaft (500) is provided with a cylindrical separation ring (501);

inside the spacer ring (501) is a coupler shaft receiving cavity (502);

the space between the separation ring (501) and the iron core stepped shaft (500) is a surrounding electromagnetic coil accommodating cavity (503);

an electromagnetic coil (6) located in an electromagnetic coil accommodation cavity (503) of the iron core (5);

The rear end of the coupler shaft (4) is positioned in the coupler shaft accommodating cavity (502);

the rear end cavity (203) of the coupler housing (2) is a cavity with an opening on the right side;

and a core stepped shaft (500) extending into a rear end cavity (203) of the coupler housing (2).

10. An electromagnetic friction coupling for electric switches as claimed in claim 9, characterized in that the core stepped shaft (500) at the front end of the core (5) is in clearance fit with the rear end cavity (203) of the coupling housing (2);

the coupler shaft receiving cavity (502) is in clearance fit with the rear end of the coupler shaft (4).