CN114785038A - Direct current has brush gear motor - Google Patents

Abstract

The application relates to a direct-current brush speed reducing motor, which relates to the field of speed reducing motors and comprises a driving motor and a speed reducing mechanism, wherein the driving motor comprises a shell, a stator and a rotor, wherein the stator and the rotor are arranged in the shell; the speed reducing mechanism comprises a box body, a worm wheel and a worm, the shell is connected to one side of the box body, the worm wheel is rotationally connected in the box body, the worm is arranged in the box body in a penetrating mode, and the worm is meshed with the worm wheel and connected with the output end of the rotor; the worm is provided with an axial limiting structure, the axial limiting structure comprises a first limiting part and a second limiting part, the second limiting part and the second limiting part are both fixed relative to the worm, the first limiting part is abutted against the inner side wall of the box body, and the second limiting part is abutted against the outer side of the box body. This application effectively reduces the reduction gear at rotatory switching-over in-process, and the worm takes place the axial float under the effect of the rotatory inertia force of worm wheel, and then causes the condition of collision abnormal sound to take place, ensures reduction gear operating stability and reliability, improves life.

Description

Direct current has brush gear motor

Technical Field

The application relates to the field of speed reduction motors, in particular to a direct-current brush speed reduction motor.

Background

The electric power steering system controls the EPS motor to rotate based on the change condition of the ECU controller according to the acquired sensor torque signal and the acquired angle signal, and the EPS motor drives the worm and gear speed reducing mechanism to provide power required by vehicle steering, so that the steering performance of the vehicle is improved. That is, the EPS steering system is used to improve the motion stability of the vehicle by using a separate EPS motor to power assist the steering of the vehicle. Conventionally, an auxiliary Steering device uses hydraulic pressure, but recently, an Electric Power Steering (EPS) system adapted to transmit a rotational output of a motor to a Steering shaft via a speed reducer has been increasingly utilized from the viewpoints of reducing an engine load, reducing a weight, improving Steering stability, and a quick return force.

The speed reducer of the related electric power steering system comprises an EPS motor and a speed reducing mechanism connected with the EPS motor, and mainly comprises a speed reducing box body, a worm gear-worm mechanism, a speed reducing planetary gear set and the like, wherein the worm gear is rotatably arranged in the speed reducing box body and meshed with the worm, one end of the worm is connected with the output end of the EPS motor, the EPS motor is used for driving the worm to rotate and simultaneously driving the worm gear to rotate, and the worm gear drives the planetary gear set to rotate and then output through an output shaft after speed reduction.

In view of the above-mentioned related technologies, the inventor believes that, in the reversing process of the speed reducer of the related electric power steering system, when the EPS motor stops providing the driving force to the worm, the worm wheel exerts an inertial force along the axial direction of the worm on the worm under the action of the rotational inertia, the worm drives the rotor of the EPS motor to axially shift under the action of the inertial force, and the service life of the speed reducer is affected by the conditions of collision, abnormal sound and the like between the worm and the motor housing.

Disclosure of Invention

In order to improve the above problem, the present application provides a direct current brushed speed reduction motor.

The application provides a direct current has brush gear motor adopts following technical scheme:

a direct current brush speed reducing motor comprises a driving motor and a speed reducing mechanism, wherein the driving motor comprises a shell, a stator and a rotor, and the stator and the rotor are arranged in the shell; the speed reducing mechanism comprises a box body, a worm wheel and a worm, the shell is connected to one side of the box body, the worm wheel is rotationally connected into the box body, the worm is arranged in the box body in a penetrating mode, and the worm is meshed with the worm wheel and connected with the output end of the rotor; the axial limiting structure is arranged between the worm and the box body and comprises a first limiting part, the first limiting part is connected with the worm, the worm is abutted to the box body through the first limiting part, and the first limiting part is used for limiting the displacement of the worm in the axial direction along the worm.

Through adopting above-mentioned technical scheme, through installing first locating part on the worm, the worm passes through first locating part and box butt, when the reduction gear at rotatory switching-over, if the direction of the direction that the worm wheel applyed is opposite with the butt power between first locating part and the box, this first locating part can effectively restrict the worm and take place the axial float under the effect of the rotatory inertia force of worm wheel, then the difficult condition that causes the collision abnormal sound takes place, guarantee reduction gear operating stability and reliability, improve life.

Preferably, the axial limiting structure further includes a second limiting member, the second limiting member is disposed on the worm, the worm is abutted to the box body through the second limiting member, and the second limiting member is used for limiting displacement of the worm in a direction opposite to the limiting direction of the first limiting member.

By adopting the technical scheme, the first limiting piece and the second limiting piece are arranged on the worm, and the worm is abutted against the inner side wall of the box body through the first limiting piece so as to limit the worm to axially move in the direction far away from the box body; the worm is abutted against the outer side wall of the box body through a second limiting piece so as to limit the worm to axially move towards the direction close to the box body; thereby effectively reduce this reduction gear at rotatory switching-over in-process, the worm takes place the axial float under the effect of the rotatory inertia force of worm wheel, and then causes the condition of collision abnormal sound to take place, guarantee reduction gear operating stability and reliability, improve life.

Preferably, the first locating part and the second locating part both comprise limiting blocking pieces, the limiting blocking pieces are installed on the worm, and the two side walls, close to each other, of the limiting blocking pieces are abutted to the box body.

Preferably, the limiting blocking piece adopts a clamp spring, and an annular groove for installing the clamp spring is formed in the outer peripheral surface of the worm.

Through adopting above-mentioned technical scheme, the jump ring cover is established on the worm and the joint is in the annular, as first locating part and second locating part, and the dismouting of being convenient for is changed between jump ring and the worm, and the purchase production of being convenient for is good as the standard component to the jump ring, and the suitability is good.

Preferably, the limiting blocking piece is a convex block, and the convex block is fixed on the peripheral surface of the worm.

Through adopting above-mentioned technical scheme, when carrying out the production and processing of worm, can be with lug machine-shaping on the worm, need not additionally to purchase spacing separation blade and assemble, reduce cost and the packaging efficiency who improves this reduction gear.

Preferably, a sleeve is arranged between the first limiting part and the inner wall of the box body, the sleeve is sleeved outside the worm and is rotatably connected with the worm, and the first limiting part is abutted to the inner wall of the box body through the sleeve.

By adopting the technical scheme, the first limiting piece is abutted against the inner wall of the box body through the sleeve; the sleeve pipe has increased the interval between first locating part and the box inner wall, provides better operating space to the installation of first locating part and dismantlement, improves the convenience of operation.

Preferably, a mounting groove is formed in the outer wall of the box body and close to the worm, a first bearing is arranged in the mounting groove, the second limiting piece is abutted to the first bearing, one end, far away from the worm, of the rotor is rotatably connected with a second bearing, and the second bearing is connected to the casing.

Preferably, one side of the first bearing close to the box body is provided with a first elastic buffer piece, and the first bearing is abutted against the inner wall of the mounting groove through the first elastic buffer piece.

By adopting the technical scheme, the first bearing is abutted against the inner wall of the mounting groove through the first elastic buffer piece, the first elastic buffer piece plays a role in buffering and protecting the first bearing, and the impact of axial movement of the worm on the first bearing is reduced when the speed reducer is reversed; and the first elastic buffer piece exerts elastic force on the worm through the first limiting piece, so that the worm and the worm wheel can keep good meshing contact, the influence of manufacturing tolerance or meshing abrasion on a meshing gap between the worm and the worm wheel is reduced, the worm wheel and the worm have good self-adaptability, and the starting reaction speed is improved.

Preferably, one side of the second bearing, which is far away from the rotor, is provided with a second elastic buffer member, and the second bearing is abutted against the inner wall of the casing through the second elastic buffer member.

By adopting the technical scheme, the second bearing is abutted against the shell through the second elastic buffer part, the second elastic buffer part plays a role in buffering and protecting the second bearing, and the impact of axial movement of the worm on the second bearing when the speed reducer is reversed is reduced; and the second elastic buffer piece exerts elastic force on the worm, so that the worm and the worm wheel can keep good meshing contact, the influence of manufacturing tolerance or meshing abrasion on a meshing gap between the worm and the worm wheel is reduced, and the starting reaction speed is improved.

Preferably, the stator comprises two magnetic shoes which are oppositely arranged, the magnetic shoes are attached to the inner wall of the casing, and a fixing structure for fixing the magnetic shoes is arranged in the casing; the fixing structure comprises a positioning insertion piece and an elastic insertion piece, the positioning insertion piece and the elastic insertion piece are respectively positioned at the side walls of the two ends of the arc length direction of the magnetic shoe, and the two sides of the positioning insertion piece and the two sides of the elastic insertion piece are abutted to the magnetic shoe.

By adopting the technical scheme, the elastic insert applies elastic pressure to the magnetic shoes on the two sides, so that the magnetic shoes are abutted against the positioning insert, and the magnetic shoes are clamped and fixed on the inner wall of the shell; the magnetic shoe is detachably connected in the casing through a fixing structure, so that the driving motor is convenient to disassemble, assemble and maintain.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the axial play of the worm under the action of the rotating inertia force of the worm wheel in the rotating and reversing process of the speed reducer is effectively reduced, so that the condition of collision abnormal sound is caused, the running stability and reliability of the speed reducer are guaranteed, and the service life is prolonged;

2. the distance between the first limiting piece and the inner wall of the box body is increased by arranging the sleeve, so that a better operation space is provided for the installation and the disassembly of the first limiting piece, and the convenience of operation is improved;

3. through setting up first elastic buffer spare, not only play the buffering guard action to first bearing, and first elastic buffer spare's elastic force makes and can keep good meshing contact between worm and the worm wheel, reduces manufacturing tolerance or meshing wearing and tearing to the influence in the meshing clearance between worm and the worm wheel for have good self-adaptation nature between worm wheel and the worm, improve and start reaction rate.

Drawings

Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present application.

Fig. 2 is a schematic structural diagram of a matching relationship between a worm wheel and a worm in a box body in embodiment 1 of the present application.

Fig. 3 is a partial exploded view of embodiment 1 of the present application.

Fig. 4 is an exploded view of the axial stopper structure according to embodiment 1 of the present application.

Fig. 5 is a partial sectional view for embodying an axial stopper structure according to embodiment 1 of the present application.

Fig. 6 is a schematic structural diagram for embodying an internal structure of a drive motor according to embodiment 1 of the present application.

Fig. 7 is a schematic structural view of the positioning insert in embodiment 1 of the present application.

Fig. 8 is a schematic structural diagram of a chassis in embodiment 1 of the present application.

Fig. 9 is a partial sectional view for embodying a center distance fine adjustment mechanism in embodiment 2 of the present application.

Fig. 10 is an exploded view of the center-distance adjustment mechanism in embodiment 2 of the present application.

Fig. 11 is a partially enlarged view of a portion a in fig. 9.

Description of reference numerals: 1. a drive motor; 11. a housing; 12. a stator; 121. a magnetic shoe; 13. a rotor; 2. a speed reduction mechanism; 21. a box body; 211. a first mounting cavity; 212. a second mounting cavity; 213. mounting grooves; 214. connecting grooves; 22. a worm gear; 23. a worm; 231. a ring groove; 3. an axial limiting structure; 30. a limiting baffle sheet; 31. a first limit piece; 32. a second limiting member; 33. a first elastic buffer member; 34. a second elastic buffer member; 35. a sleeve; 36. a first bearing; 37. a second bearing; 4. a fixed structure; 41. positioning the insert sheet; 411. a flat plate; 412. a first side clamping plate; 413. positioning a plate; 414. a limiting block; 42. an elastic insert; 421. an elastic folded plate; 422. a second side clamping plate; 43. a support block; 5. a center distance fine adjustment mechanism; 51. a mounting seat; 52. a mounting ring; 53. a third bearing; 54. adjusting the bolt; 55. fine-tuning the gap; 56. an elastic connecting block; 57. a flexible gasket; 6. and an output shaft.

Detailed Description

The present application is described in further detail below with reference to figures 1-11.

Example 1:

the embodiment of the application discloses direct current has brush gear motor. Referring to fig. 1, 2 and 3, a direct current brushed speed reduction motor includes a driving motor 1, a speed reduction mechanism 2 and an output shaft 6. The driving motor 1 comprises a casing 11, a stator 12 and a rotor 13 which are arranged in the casing 11, and the speed reducing mechanism 2 comprises a box body 21, a worm wheel 22 and a worm 23; the casing 11 is fixedly connected to one side of the box 21 through bolts, a first mounting cavity 211 for mounting the worm 23 is formed in the box 21, a second mounting cavity 212 for mounting the worm 23 is formed in the box 21, and the first mounting cavity 211 is communicated with the second mounting cavity 212. The worm wheel 22 is positioned in the first mounting cavity 211 and is rotationally connected with the box body 21, the worm 23 penetrates through the second mounting cavity 212 of the box body 21, the worm wheel 22 is meshed with the worm 23, and one end of the worm 23 is connected with the output end of the rotor 13. The driving motor 1 drives the worm 23 to rotate, the worm 23 is meshed with the worm wheel 22 and drives the worm wheel 22 to rotate, and the worm wheel 22 drives a planetary gear set (not shown in the figure) in the box body 21 to rotate and decelerate, and then the output shaft 6 outputs the rotation outwards.

Referring to fig. 3 and 4, in the reversing process of the speed reducer, when the driving motor 1 stops providing driving force to the worm 23, the worm wheel 22 applies an inertial force along the axial direction of the worm 23 to the worm 23 under the action of rotational inertia, and the worm 23 drives the rotor 13 of the driving motor 1 to axially shift under the action of the inertial force, so that abnormal noise and the like occur between the rotor and the motor housing 1, which affects the service life of the speed reducer. Therefore, the worm 23 is provided with the axial limiting structure 3, the axial limiting structure 3 includes a first limiting member 31 and a second limiting member 32, the first limiting member 31 and the second limiting member 32 both include a limiting blocking piece 30, the limiting blocking piece 30 is mounted on the worm 23, and the mutually adjacent side walls of the two limiting blocking pieces 30 on the worm 23 are both abutted to the box body 21. The worm 23 is abutted against the inner wall of the box body 21 through the first limiting piece 31, and the worm 23 is abutted against the outer wall of the box body 21 through the second limiting piece 32, so that the movement of the worm 23 along the self axial direction is limited, the running stability and reliability of the speed reducer are guaranteed, and the service life is prolonged.

Referring to fig. 3 and 4, the first limiting member 31 and the second limiting member 32 may be snap springs or protruding blocks, and any structure may be used as long as it can limit the displacement of the worm 23 in the axial direction. In this embodiment, the first limiting member 31 and the second limiting member 32 both adopt snap springs, and an annular groove 231 for mounting the first limiting member 31 and the second limiting member 32 is formed on the outer circumferential surface of the worm 23. The snap spring is sleeved on the worm 23 and clamped in the annular groove 231 to serve as a first limiting piece 31 and a second limiting piece 32, and the snap spring and the worm 23 are convenient to disassemble, assemble and replace; and the clamp spring is used as a standard part, so that the purchase and production are convenient, and the applicability is good. In another embodiment, the first limiting member 31 and the second limiting member 32 are bumps integrally formed on the worm 23, and the bumps can be formed on the worm 23 during the processing of the worm 23, so that the first limiting member 31 and the second limiting member 32 do not need to be additionally assembled and configured, thereby effectively reducing the production cost.

Referring to fig. 4 and 5, a sleeve 35 is coaxially sleeved on the worm 23, the sleeve 35 is located in the second mounting cavity 212, the sleeve 35 is located on one side of the first limiting member 31 close to the inner wall of the box 21, and the first limiting member 31 abuts against the inner wall of the box 21 through the sleeve 35. The distance between the first limiting part 31 and the inner wall of the box body 21 is increased due to the arrangement of the sleeve 35, a better operation space is provided for the installation and the disassembly of the first limiting part 31, and the convenience of operation is improved. An installation groove 213 is formed in the outer wall of the box 21, the position of the outer wall of the box 21 is close to the worm 23, a first bearing 36 is fixed in the installation groove 213, the worm 23 penetrates through the first bearing 36, the second limiting member 32 is located on one side, away from the box 21, of the first bearing 36, and the second limiting member 32 is abutted to the first bearing 36.

Referring to fig. 3 and 4, the first elastic cushion 33 is disposed on the side of the first bearing 36 close to the case 21, the first elastic cushion 33 is located in the mounting groove 213, and the first bearing 36 abuts against the case 21 via the first elastic cushion 33. The first elastic buffer piece 33 plays a role in buffering and protecting the first bearing 36, and reduces the impact of the axial float of the worm 23 on the first bearing 36 when the speed reducer is reversed; and the first elastic buffer 33 applies elastic force to the worm 23 through the first limit piece 31, so that the worm 23 and the worm wheel 22 can keep good meshing contact, the influence of manufacturing tolerance or meshing abrasion on a meshing gap between the worm 23 and the worm wheel 22 is reduced, the worm wheel 22 and the worm 23 have good self-adaptability, and the starting reaction speed is improved.

Referring to fig. 3 and 4, a second bearing 37 is rotatably connected to one end of the rotor 13 away from the worm 23, the second bearing 37 is fixedly connected to the housing 11, a second elastic buffer 34 is disposed on one side of the second bearing 37 away from the rotor 13, and the second bearing 37 abuts against the inner wall of the housing 11 through the second elastic buffer 34. The first elastic buffer member 33 and the second elastic buffer member 33 both adopt corrugated ring elastic sheets; the second elastic buffer piece 34 plays a role in buffering and protecting the second bearing 37, the second elastic buffer piece 34 applies elastic force to the worm 23 through the rotor 13, so that the worm 23 can keep good meshing contact with the worm wheel 22, the influence of manufacturing tolerance or meshing abrasion on a meshing gap between the worm 23 and the worm wheel 22 is reduced, good adaptability between the worm wheel 22 and the worm 23 is achieved, and the starting reaction speed is improved.

Referring to fig. 3 and 6, the stator 12 includes two magnetic shoes 121 disposed opposite to each other, the magnetic shoes 121 are attached to an inner wall of the casing 11, and a fixing structure 4 for fixing the magnetic shoes 121 is disposed in the casing 11. The fixing structure 4 comprises a positioning insertion sheet 41 and an elastic insertion sheet 42, the positioning insertion sheet 41 and the elastic insertion sheet 42 are respectively located at the side walls of the two ends of the magnetic shoe 121 in the arc length direction, and the two sides of the positioning insertion sheet 41 and the two sides of the elastic insertion sheet 42 are respectively abutted to the magnetic shoe 121. The elastic inserting sheet 42 applies elastic pressure to the magnetic shoes 121 on the two sides, so that the magnetic shoes 121 are abutted against the positioning inserting sheet 41, and the magnetic shoes 121 are clamped and fixed on the inner wall of the machine shell 11; and the magnetic shoe 121 is detachably connected in the casing 11 through the fixing structure 4, so that the subsequent disassembly, assembly and maintenance of the driving motor 1 are facilitated.

Referring to fig. 6 and 7, the positioning insertion sheet 41 includes a flat plate 411 and first side clamping plates 412 integrally formed on two sides of the flat plate 411, the first side clamping plates 412 are matched with the end surface profile of the magnetic shoe 121 in the arc length direction, the first side clamping plates 412 on two sides of the flat plate 411 are provided with two, and the two first side clamping plates 412 are abutted to the side wall of the magnetic shoe 121 in an attaching manner. A positioning plate 413 is integrally formed on one side of the flat plate 411, which is close to each magnetic shoe 121, and the positioning plate 413 is bent towards the direction close to the machine shell 11; casing 11's inner wall stamping forming has two stopper 414, stopper 414 is located between two locating plates 413, one-to-one between stopper 414 and the locating plate 413, stopper 414 and locating plate 413's inside wall butt, then play installation location and spacing effect to location inserted sheet 41, and location inserted sheet 41 again with magnetic shoe 121 butt, carry out the installation to magnetic shoe 121 and also play good installation location effect, guarantee magnetic shoe 121 stability in casing 11.

Referring to fig. 6, the elastic inserting sheet 42 includes an elastic folding sheet 421 and second side clamping sheets 422 integrally formed on two sides of the elastic folding sheet 421, the second side clamping sheets 422 are adapted to the end surface profile of the magnetic shoe 121 in the arc length direction, the second side clamping sheets 422 are attached to and abutted against the magnetic shoe 121, the elastic folding sheet 421 is in a compressed state, the elastic folding sheet 421 applies a pressure to the magnetic shoe 121 to move towards the positioning inserting sheet 41 through the second side clamping sheets 422, so that the magnetic shoe 121 is clamped and fixed between the elastic inserting sheet 42 and the fixing inserting sheet.

Referring to fig. 6 and 8, four supporting blocks 43 are stamped and formed on the inner wall of the housing 11, the supporting blocks 43 are located at the bottom of the magnetic shoes 121, two supporting blocks 43 are arranged on the bottom surface of each magnetic shoe 121, and the supporting blocks 43 abut against the bottom surface of the magnetic shoes 121 to support the magnetic shoes 121.

The implementation principle of the embodiment 1 of the application is as follows: by mounting the first stopper 31 and the second stopper 32 on the worm 23, the worm 23 abuts against the inner side wall of the case 21 through the first stopper 31 to restrict the axial movement of the worm 23 in a direction away from the case 21; the worm 23 abuts against the outer side wall of the case 21 through the second stopper 32 to restrict the axial movement of the worm 23 in the direction approaching the case 21; therefore, the axial play of the worm 23 under the action of the rotating inertia force of the worm wheel 22 in the rotating reversing process of the speed reducer is effectively reduced, the condition of collision abnormal sound is further caused, the running stability and reliability of the speed reducer are guaranteed, and the service life is prolonged.

Example 2:

referring to fig. 9 and 10, the embodiment of the present application differs from embodiment 1 in that: the box body 21 is provided with a center distance fine adjustment mechanism 5, the center distance fine adjustment mechanism 5 comprises an installation seat 51, an installation ring 52, a third bearing 53 and an adjusting bolt 54, the inner wall of the second installation cavity 212 is provided with a connection groove 214, the installation seat 51 is fixed in the connection groove 214, and the center of the installation seat 51 is provided with a circular through hole. The mounting ring 52 is located in the through hole, the mounting ring 52 is coaxially arranged with the through hole, a fine adjustment gap 55 is formed between the outer wall of the mounting ring 52 and the inner wall of the through hole, the fine adjustment gap 55 is 1.5mm-2.5mm, and in this embodiment, the fine adjustment gap 55 is set to be 2 mm. An elastic connecting block 56 is connected between the mounting ring 52 and the mounting seat 51, the mounting ring 52 and the mounting seat 51 are connected through the elastic connecting block 56, and the mounting seat 51, the mounting ring 52 and the elastic connecting block 56 are integrally formed. The third bearing 53 is installed in the mounting ring 52, and one end of the worm 23 far away from the driving motor 1 is rotatably connected with the third bearing 53. The adjusting bolt 54 is inserted into the case 21, the adjusting bolt 54 is screwed with the case 21, and one end of the adjusting bolt 54 inserted into the case 21 penetrates through the mounting seat 51 and abuts against the outer wall of the mounting ring 52.

Referring to fig. 10 and 11, due to the existence of machining errors and assembly errors of the worm 23 and the worm wheel 22, and the abrasion between the worm 23 and the worm wheel 22 during the meshing transmission of the worm wheel 22 and the worm 23 for a long time, the meshing clearance between the worm 23 and the worm wheel 22 becomes large, and the transmission stability is affected. By rotating the fine adjustment mechanism 5, the adjustment bolt 54 is rotated, and the adjustment bolt 54 abuts against the mounting ring 52, so that the mounting ring 52 is displaced in a direction approaching the worm wheel 22, and the meshing gap between the worm wheel 22 and the worm 23 is reduced, so that the worm wheel 22 and the worm 23 can maintain good meshing contact.

Referring to fig. 9 and 10, in order to improve the situation that the worm 23 is deflected by centrifugal force when the worm 23 rotates and the end of the worm 23 is close to the center distance fine adjustment mechanism 5, a flexible gasket 57 made of rubber is provided in the fine adjustment gap 55, and the flexible gasket 57 is attached to the inner wall of the mounting seat 51 and the inner wall of the mounting ring 52. After the position of the mounting ring 52 is adjusted, the flexible gasket 57 provides a good supporting and stabilizing effect for the mounting ring 52, and the elastic force applied by the flexible gasket 57 to the mounting ring 52 acts on the adjusting bolt 54 to pre-tighten the adjusting bolt 54, so that the adjusting bolt 54 is not easy to loosen.

The principle of the embodiment of the application 2 is as follows: by rotating the center distance fine adjustment mechanism 5, the adjustment bolt 54 is rotated, and the adjustment bolt 54 abuts against the mounting ring 52, so that the mounting ring 52 is shifted in a direction approaching the worm wheel 22, and then the meshing gap between the worm wheel 22 and the worm 23 is reduced, so that the worm wheel 22 and the worm 23 can be kept in good meshing contact. After the position of the mounting ring 52 is adjusted, the flexible elasticity provides a good supporting and stabilizing effect for the mounting ring 52, and the centrifugal deflection condition of the worm 23 during rotation is reduced; and the elastic force applied to the mounting ring 52 by the flexible gasket 57 acts on the adjusting bolt 54 to pre-tighten the adjusting bolt 54, so that the adjusting bolt 54 is not easy to loosen.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A direct-current brush speed reducing motor comprises a driving motor (1) and a speed reducing mechanism (2), wherein the driving motor (1) comprises a machine shell (11), and a stator (12) and a rotor (13) which are arranged in the machine shell (11); the speed reducing mechanism (2) comprises a box body (21), a worm wheel (22) and a worm (23), the shell (11) is connected to one side of the box body (21), the worm wheel (22) is rotatably connected into the box body (21), the worm (23) penetrates through the box body (21), and the worm (23) is meshed with the worm wheel (22) and is connected with the output end of the rotor (13); the method is characterized in that: set up between worm (23) and box (21) and be equipped with axial limit structure (3), axial limit structure (3) include first locating part (31), first locating part (31) are connected with worm (23), worm (23) are through first locating part (31) and box (21) butt, first locating part (31) are used for limiting worm (23) along the arbitrary ascending displacement of axial of self.

2. The direct-current brushed speed reduction motor according to claim 1, characterized in that: the axial limiting structure (3) further comprises a second limiting part (32), the second limiting part (32) is arranged on the worm (23), the worm (23) is abutted to the box body (21) through the second limiting part (32), and the second limiting part (32) is used for limiting the displacement of the worm (23) in the direction opposite to the limiting direction of the first limiting part (31).

3. The direct-current brushed speed reduction motor according to claim 2, characterized in that: the first limiting part (31) and the second limiting part (32) comprise limiting blocking pieces (30), the limiting blocking pieces (30) are installed on the worm (23), and the side walls, close to each other, of the limiting blocking pieces (30) are abutted to the box body (21).

4. A dc brushed speed reduction motor according to claim 3, wherein: spacing separation blade (30) adopt the jump ring, annular (231) that supply the jump ring installation have been seted up on worm (23) outer peripheral face.

5. A direct current brushed gear motor according to claim 3, characterized in that: the limiting blocking piece (30) adopts a convex block, and the convex block is fixed on the outer peripheral surface of the worm (23).

6. A direct current brushed gear motor according to claim 3, characterized in that: be provided with sleeve pipe (35) between the inner wall of first locating part (31) and box (21), sleeve pipe (35) cover be located with worm (23) outside and with worm (23) rotation connection, first locating part (31) pass through the inner wall butt of sleeve pipe (35) and box (21).

7. The direct-current brushed speed reduction motor according to claim 2, characterized in that: the outer wall of box (21) is close to worm (23) and has been seted up mounting groove (213), be provided with first bearing (36) in mounting groove (213), second locating part (32) and first bearing (36) butt, the one end rotation that worm (23) were kept away from in rotor (13) is connected with second bearing (37), second bearing (37) are connected on casing (11).

8. The direct-current brushed speed reduction motor according to claim 7, characterized in that: one side that first bearing (36) are close to box (21) is provided with first springy cushioning spare (33), first bearing (36) are through first springy cushioning spare (33) and mounting groove (213) inner wall butt.

9. The direct-current brushed speed reduction motor according to claim 8, characterized in that: one side that rotor (13) was kept away from in second bearing (37) is provided with second elastic buffer piece (34), second bearing (37) are through second elastic buffer piece (34) and casing (11) inner wall butt.

10. The direct-current brushed speed reduction motor according to claim 1, characterized in that: the stator (12) comprises two magnetic shoes (121) which are oppositely arranged, the magnetic shoes (121) are attached to the inner wall of the casing (11), and a fixing structure (4) for fixing the magnetic shoes (121) is arranged in the casing (11); fixed knot constructs (4) including location inserted sheet (41) and elasticity inserted sheet (42), location inserted sheet (41) and elasticity inserted sheet (42) are located the lateral wall department at magnetic shoe (121) arc length direction both ends respectively, the both sides of location inserted sheet (41) and elasticity inserted sheet (42) all with magnetic shoe (121) butt.

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