CN220692945U - Transmission equipment for gear motor and gear motor - Google Patents

Abstract

The utility model discloses a transmission device for a gear motor and the gear motor. The transmission equipment for the gear motor comprises a worm transmission part, a shell, a multi-stage gear transmission mechanism and an output shaft, wherein the worm transmission part and the multi-stage gear transmission mechanism are arranged in an inner cavity of the shell, the multi-stage gear transmission mechanism is in meshed transmission connection with the worm transmission part, the output shaft is fixedly connected with the multi-stage gear transmission mechanism, the axial direction of the output shaft is vertical to the axial direction of the worm transmission part, the output shaft extends out of the inner cavity of the shell, one end of the worm transmission part is fixedly connected with a mandrel of the motor, the other end of the worm transmission part is connected with the shell through a supporting mechanism, and the extending direction of the supporting mechanism is crossed with the axial direction of the worm transmission part. According to the utility model, one end of the worm transmission part is connected with the shell through the supporting mechanism, so that the supporting capability of the worm transmission part is effectively improved, and the problem that the poor starting of the gear motor is influenced due to the fact that the rigidity of the shaft of the worm transmission part is insufficient to be subjected to stress bending is effectively solved.

Description

Transmission equipment for gear motor and gear motor

Technical Field

The utility model relates to transmission equipment for a gear motor and the gear motor, and belongs to the technical field of motor equipment.

Background

An electric motor is a device that converts electrical energy into mechanical energy. The magnetic power rotating torque is formed by generating a rotating magnetic field by using an electrified coil (namely a stator winding) and acting on a rotor (such as a squirrel-cage closed aluminum frame). Motors are classified into dc motors and ac motors according to the power source used. The DC motor is widely applied to electric traction due to the good speed regulation performance, and has the following characteristics: the term "speed regulation performance" means that the rotational speed of the motor is artificially changed as required under a certain load condition. The DC motor can realize uniform and smooth stepless speed regulation under the heavy load condition, and the speed regulation range is wider. The starting torque is large, and the rotation speed adjustment can be uniformly and economically realized.

Because the structure installation of motor is dismantled more conveniently, so by wide application in each big field, wherein often use worm formula direct current motor as gear motor on lampblack absorber, as the patent of application number as 20161056552. X, disclose a direct current gear motor, including direct current motor and connect the reduction gearbox in direct current motor output, wherein reduction gearbox includes the casing, the worm, multistage gear train and output shaft, the casing sets up in one side of direct current motor output, the worm sets up in the casing and overlaps the mandrel of locating direct current motor, multistage gear train connects in the worm, output shaft is in multistage gear train and exposes from the casing, output shaft and direct current motor's mandrel mutually perpendicular.

However, the direct current motor with the worm is easy to generate stress bending phenomenon due to insufficient rigidity of the worm shaft part, and finally, the problem of poor starting of the speed reducing motor is caused.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide a transmission device for a gear motor and the gear motor.

In order to achieve the purpose of the utility model, the technical scheme adopted by the utility model comprises the following steps:

the utility model provides transmission equipment for a gear motor, which comprises a worm transmission part, a shell, a multi-stage gear transmission mechanism and an output shaft, wherein the worm transmission part and the multi-stage gear transmission mechanism are arranged in an inner cavity of the shell, the multi-stage gear transmission mechanism is in meshed transmission connection with the worm transmission part, the output shaft is fixedly connected with the multi-stage gear transmission mechanism, the axial direction of the output shaft is perpendicular to the axial direction of the worm transmission part, the output shaft extends out of the inner cavity of the shell, one end of the worm transmission part is fixedly connected with a mandrel of the motor, the other end of the worm transmission part is connected with the shell through a supporting mechanism, and the extending direction of the supporting mechanism is crossed with the axial direction of the worm transmission part.

Further, one end of the supporting mechanism is fixedly connected to one side, extending out of the output shaft, of the shell, the other end of the supporting mechanism is detachably connected with one end of the worm transmission piece, and the extending direction of the supporting mechanism is perpendicular to the axial direction of the worm transmission piece.

Further, the supporting mechanism comprises a supporting rod and a supporting seat, the supporting seat is provided with a first notch, the supporting seat is sleeved at one end of the worm transmission part through the first notch, one side of the supporting seat is provided with a first connecting structure, one end of the supporting rod is fixedly connected with the shell, the other end of the supporting rod is provided with a second connecting structure, the first connecting structure is matched and connected with the second connecting structure, and the axial direction of the supporting rod is perpendicular to the axial direction of the worm transmission part.

Further, the first connecting structure comprises an I-shaped bulge, the second connecting structure comprises a T-shaped groove, and the I-shaped bulge is matched and inserted with the T-shaped groove.

Further, the supporting seat is an insulating supporting seat, and the shell is provided with a plurality of insulating bulges along the circumferential direction of the worm transmission piece.

Further, the multi-stage gear transmission mechanism comprises a first gear assembly meshed with the worm transmission member, a second gear assembly meshed with the first gear assembly, a third gear assembly meshed with the second gear assembly, a fourth gear assembly meshed with the third gear assembly, and the output shaft is fixedly connected with the fourth gear assembly.

Further, the first gear assembly comprises a first shaft body connected in the shell, a first large gear and a first small gear which are coaxially and fixedly connected to the first shaft body, the second gear assembly comprises a second shaft body connected in the shell, a second large gear and a second small gear which are coaxially and fixedly connected to the second shaft body, the third gear assembly comprises a third shaft body connected in the shell, a third large gear and a third small gear which are coaxially and fixedly connected to the third shaft body, the fourth gear assembly comprises a fourth shaft body connected in the shell, and a fourth large gear which is coaxially and fixedly connected to the fourth shaft body, the first large gear is meshed with the worm transmission piece, the first small gear is meshed with the second large gear, the second small gear is meshed with the third large gear, the third small gear is meshed with the fourth large gear, and the output shaft is fixedly connected to the fourth shaft body.

Further, the inner surface of the shell is provided with a plurality of shaft body grooves, shaft body protrusions are correspondingly formed on the outer surface of the shell, at least part of the first shaft body, the second shaft body, the third shaft body and the fourth shaft body are movably arranged in the shaft body grooves, and the shaft body protrusions are connected through reinforcing ribs.

The utility model also provides a gear motor, which comprises a direct current motor, a motor case and the transmission equipment for the gear motor, wherein the direct current motor is arranged in the motor case, and a mandrel of the direct current motor is fixedly connected with one end of the worm transmission piece.

Further, an insulating piece is arranged between the direct current motor and the inner wall of the motor box. Compared with the prior art, the utility model has the advantages that:

(1) According to the utility model, the supporting mechanism is arranged on the shell, one end of the worm transmission part is connected with the shell, so that the supporting capability of the worm transmission part can be effectively improved, and the problem that the starting failure of the speed reduction motor is influenced due to insufficient axial rigidity of the worm transmission part and forced bending is effectively solved.

(2) The utility model can achieve 5-level transmission by arranging the multi-level gear transmission mechanism to be meshed with the worm transmission part, and greatly provides the transmission ratio of the gear motor.

(3) The worm is meshed with the gear for transmission, so that the motor size is reduced, the installation size is compact, and the installation and the use are convenient.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the transmission apparatus in embodiment 1 of the present utility model;

fig. 2 is a schematic view of the internal structure of the case in embodiment 1;

fig. 3 is a schematic structural view of a multi-stage gear transmission mechanism in embodiment 1;

fig. 4 is a schematic structural view of the case in embodiment 1; …;

fig. 5 is a schematic diagram of the structure of a reduction motor in embodiment 2 of the present utility model;

fig. 6 is a partial sectional view of the reduction motor in embodiment 2;

reference numerals illustrate:

100. a housing; 110. an insulating protrusion; 120. a shaft body groove; 130. the shaft body is convex; 140. reinforcing ribs; 150. an interface bulge; 200. a worm drive; 310. a first gear assembly; 311. a first shaft body; 312. a first gearwheel; 313. a first pinion gear; 320. a second gear assembly; 321. a second shaft body; 322. a second gearwheel; 323. a second pinion gear; 330. a third gear assembly; 331. a third shaft body; 332. a third gearwheel; 333. a third pinion gear; 340. a fourth gear assembly; 341. a fourth shaft body; 342. a fourth large gear; 400. an output shaft; 500. a support structure; 510. a support rod; 511. a second connection structure; 520. a support base; 521. a first connection structure; 522. a first notch; 600. a DC motor; 700. a motor case; 710. an insulating member.

Detailed Description

In view of the shortcomings in the prior art, the inventor of the present utility model has long studied and practiced in a large number of ways to propose the technical scheme of the present utility model. The technical scheme, the implementation process, the principle and the like are further explained as follows. Unless specifically stated otherwise, the present utility model provides a gear motor comprising functional components and the like which are known to those skilled in the art and which are directly available from commercial sources, or which can be obtained by processing commercially available workpieces by conventional processes, and the structure, model, etc. thereof are not limited and described herein.

Example 1

Referring to fig. 1-4, a transmission device for a gear motor includes a worm driving member 200, a housing 100, a multi-stage gear driving mechanism and an output shaft 400, wherein the worm driving member 200 and the multi-stage gear driving mechanism are disposed in an inner cavity of the housing 100, the multi-stage gear driving mechanism is in meshed transmission connection with the worm driving member 200, the output shaft 400 is fixedly connected with the multi-stage gear driving mechanism, an axial direction of the output shaft 400 is perpendicular to an axial direction of the worm driving member 200, the output shaft 400 extends out from the inner cavity of the housing 100, one end of the worm driving member 200 is fixedly connected with a spindle of the motor, the other end of the worm driving member 200 is connected with the housing 100 through a supporting mechanism 500, and an extending direction of the supporting mechanism 500 is crossed with an axial direction of the worm driving member 200.

In the above structure, the worm driving member 200 and the multi-stage gear driving member mechanism are disposed in the inner cavity of the housing 100, wherein the worm driving member 200 is engaged with the multi-stage gear driving member, and the multi-stage gear driving member is fixedly connected with the output shaft 400, one end of the worm driving member 200 is fixedly connected with the spindle of the external motor, and the coupling can be selected for connection in the connection manner, so that the worm driving member 200 and the spindle of the external motor are ensured to coaxially rotate. During operation, the external motor drives the worm driving part 200 to rotate, so as to drive the multi-stage gear driving mechanism to correspondingly rotate, and under the cooperation of the multi-stage gear driving mechanism, the speed reduction effect of the speed reduction motor is realized, and the speed after speed reduction is output outwards through the output shaft 400.

In addition, the other end of the worm driving member 200 is connected to the housing 100 through the supporting mechanism 500, and in the operation of the gear motor, the output shaft 400 is connected to the working member, in this embodiment, the gear driving apparatus for a gear motor is used in a gear motor of a range hood, the output shaft 400 is used to connect corresponding components in the range hood, wherein the output shaft 400 receives the force of the range hood, the output shaft 400 transmits the force to the multi-stage gear driving mechanism and the worm driving member 200, the shaft rigidity of the general worm driving member 200 is small, the worm driving member 200 is easy to be stressed and bent under the action of the force for a long time, and thus the problem of poor starting of the gear motor is caused, therefore, the worm driving member 200 is connected to the housing 100 through the supporting mechanism 500, so that the housing 100 and the supporting mechanism 500 provide a certain supporting capability for the worm driving member 200, and the force can be transmitted to the supporting mechanism 500 and the housing 100 when the worm driving member 200 receives the force, thereby reducing the pressing force to the worm driving member 200, and reducing the bending phenomenon of the worm driving member 200. In addition, the extending direction of the supporting mechanism 500 is intersected with the axial direction of the worm transmission member 200, the supporting mechanism 500 provides the supporting force intersected with the axial direction of the worm transmission member 200, the supporting capability of the worm transmission member 200 is improved, and the problem that the shaft of the worm transmission member 200 is stressed and bent is effectively reduced.

Among them, in the mechanism of the housing 100, the housing 100 includes a first housing and a second housing, which are detachably connected, and enclose the multi-stage gear transmission mechanism and the worm transmission member 200 in the inner cavity thereof. The first housing and the second housing may be connected vertically or left and right, and in the connection manner, a connection manner known to those skilled in the art such as threaded connection or clamping connection may be selected, so that the housing 100 is configured to be detachably connected, and the engagement installation of the multi-stage gear transmission mechanism and the worm transmission is facilitated.

In this embodiment, the multi-stage gear transmission mechanism and the worm transmission member 200 are engaged to drive, so that the transmission ratio of the gear motor is improved, and the volume of the transmission device is more compact while the transmission ratio of the gear motor is ensured, so that the application range of the transmission device is improved.

A plurality of interface protrusions 150 are provided at one side of the housing 100, as shown in fig. 1, the interface protrusions 150 are provided with mounting interfaces, wherein in this embodiment, 4 interface protrusions 150 are provided, which are respectively provided at two symmetrical sides of the housing 100, and the size between the mounting interfaces is also smaller due to the smaller volume of the transmission device, thereby further improving the applicability of the transmission device in a smaller space.

Further, one end of the supporting mechanism 500 is fixedly connected to one side of the housing 100 from which the output shaft 400 extends, the other end of the supporting mechanism 500 is detachably connected to one end of the worm driving member 200, and the extending direction of the supporting mechanism 500 is perpendicular to the axial direction of the worm driving member 200. The worm drive 200 is mainly acted by the force transmitted by the output shaft 400, and the supporting mechanism 500 is connected to the housing 100 on the same side as the output shaft 400, so that the worm drive 200 can be better supported, and the force applied by the output shaft 400 to the worm drive 200 is relieved. The extending direction of the supporting mechanism 500 is perpendicular to the axial direction of the worm driving member 200, so that the extending direction of the supporting mechanism 500 is consistent with the axial direction of the output shaft 400, and when the output shaft 400 transmits force to the worm driving member 200, the supporting mechanism 500 and the housing 100 can provide supporting force to the worm driving member 200 in the same direction to counteract or reduce the force applied by the output shaft 400 and the worm driving member 200.

In addition, the supporting mechanism 500 is detachably connected with the worm transmission member 200, so that the installation and the debugging of the shell 100 and the worm transmission member 200 are facilitated, and the supporting mechanism 500 is prevented from influencing the adjustment change on the position of the worm transmission member 200; in addition, the worm driving member 200 and the supporting mechanism 500 can be manufactured separately, so that the existing equipment can be used for production conveniently, and the cost is reduced.

In the structure of the supporting mechanism 500, as shown in fig. 4, the supporting mechanism 500 includes a supporting rod 510 and a supporting seat 520, the supporting seat 520 is provided with a first notch 522, the supporting seat 520 is sleeved at one end of the worm driving member 200 through the first notch 522, one side of the supporting seat 520 is provided with a first connecting structure 521, one end of the supporting rod 510 is fixedly connected with the housing 100, the other end of the supporting rod 510 is provided with a second connecting structure 511, the first connecting structure 521 and the second connecting structure 511 are cooperatively connected, and the axial direction of the supporting rod 510 is perpendicular to the axial direction of the worm driving member 200. The first connection structure 521 includes an i-shaped protrusion, and the second connection structure 511 includes a T-shaped slot, where the i-shaped protrusion is inserted into the T-shaped slot.

In the above-mentioned structure, the supporting seat 520 is connected with one end of the worm driving member 200, one end of the supporting rod 510 is fixedly connected to the housing 100, the connection may be detachable connection or integrally formed, and then the other end of the supporting rod 510 is connected with the supporting seat 520, so that the worm driving member 200 is connected with the housing 100, on the connection between the supporting seat 520 and the supporting rod 510, the first connection structure 521 comprises an "I" shaped protrusion arranged on one side of the supporting seat 520, the second connection structure 511 comprises a T-shaped groove, and when the connection is performed, the "I" shaped protrusion is inserted into the T-shaped groove to complete the connection, and the connection mode is convenient and fast, and meanwhile, the connection strength can be improved, and the separation of the supporting rod 510 and the supporting seat 520 is effectively avoided.

The extending direction of the "i" shaped protrusions and the T-shaped grooves is related to the structure of the housing 100, and when the housing 100 is divided into an up-down structure, the extending direction of the "i" shaped protrusions and the T-shaped grooves may be identical to the axial direction of the worm driving member 200, and when the upper housing 100 and the lower housing 100 are connected, the "i" shaped protrusions are inserted into the T-shaped grooves accordingly, thereby completing the connection. When the housing 100 is divided into a left-right structure, the extending direction of the i-shaped protrusion and the T-shaped groove may be perpendicular to the axial direction of the worm driving member 200, and when the left housing 100 and the right housing 100 are connected, the i-shaped protrusion is inserted into the T-shaped groove, thereby completing the connection.

In addition, in this embodiment, a slotted structure is provided at a middle position of the i-shaped protrusion to form a first slot 522, and when the support base 520 is connected to the worm driving member 200, the support base 520 is sleeved at one end of the worm driving member 200 through the first slot 522, thereby completing the connection.

It should be noted that, the connection manner of the first connection structure 521 and the second connection structure 511 is not limited to the above connection manner, and may be a common connection manner by those skilled in the art, such as a threaded connection, a clamping connection, a mortise-tenon connection, and the like.

Further, as shown in fig. 4, the support base 520 is an insulating support base 520, and the housing 100 is provided with a plurality of insulating protrusions 110 along the circumferential direction of the worm drive 200. The supporting seat 520 is of an insulating structure, and the insulating protrusions 110 are arranged around the worm driving member 200, so that the electric contact between the worm driving member 200 and the housing 100 can be effectively avoided, the insulating effect of the worm driving member when being connected with an external motor is improved, and the worm driving member can pass a voltage withstanding test.

The material of the supporting seat 520 and the insulating protrusion 110 may be selected from insulating materials such as nylon and glass fiber.

Further, the multi-stage gear transmission mechanism includes a first gear assembly 310 engaged with the worm transmission member 200, a second gear assembly 320 engaged with the first gear assembly 310, a third gear assembly 330 engaged with the second gear assembly 320, a fourth gear assembly 340 engaged with the third gear assembly 330, and an output shaft 400 fixedly connected with the fourth gear assembly 340. Specifically, the first gear assembly 310 includes a first shaft 311 connected to the housing 100, a first large gear 312 and a first small gear 313 coaxially and fixedly connected to the first shaft 311, the second gear assembly 320 includes a second shaft 321 connected to the housing 100, a second large gear 322 and a second small gear 323 coaxially and fixedly connected to the second shaft 321, the third gear assembly 330 includes a third shaft 331 connected to the housing 100, a third large gear 332 and a third small gear 333 coaxially and fixedly connected to the third shaft 331, the fourth gear assembly 340 includes a fourth shaft 341 connected to the housing 100, and a fourth large gear 342 coaxially and fixedly connected to the fourth shaft 341, the first large gear 312 is meshed with the worm gear 200, the first small gear 313 is meshed with the second large gear 322, the second small gear 323 is meshed with the third large gear 332, the third small gear 333 is meshed with the fourth large gear 342, and the output shaft 400 is fixedly connected to the fourth shaft 341.

In the above structure, as shown in fig. 3, by providing the first gear assembly 310, the second gear assembly 320, the third gear assembly 330 and the fourth gear assembly 340, which are engaged with the worm driving member 200, a 5-stage transmission is formed, and a reduction gear ratio is improved, which in this embodiment can reach 549.

In addition, the inner surface of the housing 100 is provided with a plurality of shaft grooves 120, and corresponding shaft protrusions 130 are formed on the outer surface of the housing 100, at least part of the first shaft 311, the second shaft 321, the third shaft 331 and the fourth shaft 341 are movably disposed in the shaft grooves 120, and the plurality of shaft protrusions 130 are connected through the reinforcing ribs 140.

The multi-stage gear transmission mechanism is placed in the shell 100, a first shaft body 311, a second shaft body 321, a third shaft body 331 and a fourth shaft body 341 in the multi-stage gear transmission mechanism are movably connected in the shell 100, a plurality of shaft body grooves 120 are formed in the inner surface of the shell 100 for realizing normal rotation of each shaft body, each shaft body is movably configured in each shaft body groove 120, in addition, shaft body protrusions 130 are correspondingly formed on the outer surface of the shell 100 at the positions of the shaft body grooves 120, the insertion depth of each shaft body into the shaft body grooves 120 is ensured, and the shaft body is prevented from being separated from the shell 100 in the rotation process, so that the normal use of a speed reduction motor is influenced. In addition, the reinforcing ribs 140 are disposed between the plurality of shaft protrusions 130 on the outer surface of the housing 100, so that the structural strength of the housing 100 is further improved, and the force applied to the housing 100 during the rotation of the shaft is prevented, thereby breaking or damaging the housing 100 due to the force.

In addition, a shaft sleeve can be arranged in the shaft body groove 120, and the shaft body is placed in the shaft sleeve, so that friction between the shaft body and the shell 100 is reduced, and the shell 100 and the shaft body are better protected.

Example 2

Referring to fig. 5-6, the present utility model further provides a gear motor, which includes a dc motor 600, a motor box 700, and a transmission device for any one of the above gear motors, wherein the dc motor 600 is disposed in the motor box 700, and a spindle of the dc motor 600 is fixedly connected with one end of the worm driving member 200.

In this embodiment, the dc motor 600 is installed in the motor case 700, wherein the motor case 700 is installed at one side of the housing 100, and then the spindle of the dc motor 600 is fixedly connected to one end of the worm driving member 200, so that the dc motor 600 drives the worm driving member 200 to rotate normally.

Further, an insulating member 710 is provided between the dc motor 600 and the inner wall of the motor case 700. By providing the insulator 710 to block direct electrical contact between the dc motor 600 and the motor case 700, the overall insulation of the motor is improved.

It should be understood that the above embodiments are merely for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the present utility model and implement the same according to the present utility model without limiting the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims (10)

1. A transmission device for a gear motor, characterized by comprising: the device comprises a worm transmission part, a shell, a multi-stage gear transmission mechanism and an output shaft, wherein the worm transmission part and the multi-stage gear transmission mechanism are arranged in an inner cavity of the shell, the multi-stage gear transmission mechanism is in meshed transmission connection with the worm transmission part, the output shaft is fixedly connected with the multi-stage gear transmission mechanism, the axial direction of the output shaft is perpendicular to the axial direction of the worm transmission part, the output shaft extends out of the inner cavity of the shell, one end of the worm transmission part is fixedly connected with a mandrel of a motor, the other end of the worm transmission part is connected with the shell through a supporting mechanism, and the extending direction of the supporting mechanism is crossed with the axial direction of the worm transmission part.

2. A transmission device for a gear motor according to claim 1, characterized in that: one end of the supporting mechanism is fixedly connected to one side of the shell, which is used for the output shaft to extend out, the other end of the supporting mechanism is detachably connected with one end of the worm transmission piece, and the extending direction of the supporting mechanism is perpendicular to the axial direction of the worm transmission piece.

3. A transmission device for a gear motor according to claim 2, characterized in that: the supporting mechanism comprises a supporting rod and a supporting seat, wherein the supporting seat is provided with a first notch, the supporting seat is sleeved at one end of the worm transmission part through the first notch, one side of the supporting seat is provided with a first connecting structure, one end of the supporting rod is fixedly connected with the shell, the other end of the supporting rod is provided with a second connecting structure, the first connecting structure is matched and connected with the second connecting structure, and the axial direction of the supporting rod is perpendicular to the axial direction of the worm transmission part.

4. A transmission apparatus for a gear motor according to claim 3, wherein: the first connecting structure comprises an I-shaped bulge, the second connecting structure comprises a T-shaped groove, and the I-shaped bulge is matched and spliced with the T-shaped groove.

5. A transmission apparatus for a gear motor according to claim 3, wherein: the supporting seat is an insulating supporting seat, and the shell is provided with a plurality of insulating bulges along the circumferential direction of the worm transmission piece.

6. A transmission device for a gear motor according to claim 1, characterized in that: the multi-stage gear transmission mechanism comprises a first gear assembly meshed with the worm transmission piece, a second gear assembly meshed with the first gear assembly, a third gear assembly meshed with the second gear assembly, a fourth gear assembly meshed with the third gear assembly, and the output shaft is fixedly connected with the fourth gear assembly.

7. The transmission apparatus for a gear motor according to claim 6, wherein: the first gear assembly comprises a first shaft body connected in the shell, a first large gear and a first small gear which are coaxially and fixedly connected to the first shaft body, the second gear assembly comprises a second shaft body connected in the shell, a second large gear and a second small gear which are coaxially and fixedly connected to the second shaft body, the third gear assembly comprises a third shaft body connected in the shell, a third large gear and a third small gear which are coaxially and fixedly connected to the third shaft body, the fourth gear assembly comprises a fourth shaft body connected in the shell, and a fourth large gear which is coaxially and fixedly connected to the fourth shaft body, the first large gear is meshed with the worm transmission piece, the first small gear is meshed with the second large gear, the second small gear is meshed with the third large gear, the third small gear is meshed with the fourth large gear, and the output shaft is fixedly connected to the fourth shaft body.

8. The transmission apparatus for a gear motor according to claim 7, wherein: the inner surface of the shell is provided with a plurality of shaft body grooves, shaft body bulges are correspondingly formed on the outer surface of the shell, at least part of the first shaft body, the second shaft body, the third shaft body and the fourth shaft body are movably arranged in the shaft body grooves, and the shaft body bulges are connected through reinforcing ribs.

9. A gear motor, comprising: the transmission device for the gear motor of any one of claims 1 to 8, the motor housing and the direct current motor are arranged in the motor housing, and a spindle of the direct current motor is fixedly connected with one end of the worm transmission member.

10. A gear motor according to claim 9, wherein: an insulating piece is arranged between the direct current motor and the inner wall of the motor box.