CN115042326A

CN115042326A - Upper-mounted driving device, assembling method thereof and mixer truck

Info

Publication number: CN115042326A
Application number: CN202210819444.2A
Authority: CN
Inventors: 杨帆; 张彦华; 李璞; 杨许刚
Original assignee: Zhejiang PanGood Power Technology Co Ltd
Current assignee: Zhejiang PanGood Power Technology Co Ltd
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2022-09-13
Also published as: WO2024011716A1

Abstract

The invention provides a top drive device, an assembling method thereof and a mixer truck, wherein the top drive device comprises a support frame, and the support frame is provided with a support surface; the motor comprises a stator and a rotor, the stator and the rotor are parallel, an air gap surface is formed between the stator and the rotor, and the motor is connected to the supporting surface in a mode that the air gap surface is approximately parallel to the supporting surface; and the stirring tank is connected to one side of the support frame away from the supporting surface and is driven by a motor to rotate around the rotating axis. The distance from the center of gravity of the motor to the support frame is shortened, the force arm is smaller, the generated bending moment is smaller, the stability and the reliability of the motor installation are improved, and the phenomena that the support frame cannot bear the dead weight of the motor, the motor breaks and the like are avoided. In addition, in the design process of increasing the motor torque by increasing the air gap surface, the moment arm is always kept in a smaller range, the load on the support frame is smaller, and the design space is enlarged.

Description

Upper-mounted driving device, assembling method thereof and mixer truck

Technical Field

The invention relates to the field of mixer trucks, in particular to an upper-mounted driving device, an assembling method thereof and a mixer truck.

Background

The mixer truck is a concrete mixer truck, which is a special truck for transporting concrete for construction, and a mixing tank is usually arranged on the truck, and the mixing tank needs to continuously mix the concrete at a low speed and a high torque to avoid concrete solidification in transportation, construction sites and the like.

The traditional mixing tank is driven by hydraulic pressure, and the hydraulic driving mode not only has low driving efficiency, but also needs an engine to continuously provide power. Therefore, the engine needs to be continuously started to provide power for the hydraulic system even after the mixer truck stops running.

The use of an electric motor to drive the agitator tank instead of a hydraulic system is the main flow direction, but because of the large mass of the agitator tank, a large driving force is required. In order to solve the problem, one scheme in the prior art is to select a high-speed-ratio reduction gearbox, and the single-speed-ratio reduction gearbox is high in cost and high in maintenance difficulty. The other type is that a large-torque motor is selected, but the large-torque motor is heavy in weight, an additional supporting structure is required to be arranged to support the motor, the manufacturing cost is increased, and otherwise the motor and the supporting frame mounting surface are easy to break.

Disclosure of Invention

In order to solve the problems, the invention provides the upper-mounted driving device with low cost and stable structure, the assembling method thereof and the mixer truck, and meanwhile, the load of the support frame is smaller due to the change of the motor model in the design process, so that the existing design space is enlarged.

According to an object of the present invention, there is provided a top loading driving apparatus including:

a support frame having a support surface;

a motor including a stator and a rotor, the stator and the rotor being parallel and forming an air gap surface therebetween, the motor being coupled to the support surface in a manner such that the air gap surface and the support surface are substantially parallel;

the stirring tank is connected to one side of the support frame far away from the support surface and is driven by the motor to rotate around the rotation axis.

In a preferred embodiment, the air gap surface is substantially perpendicular to the axis of rotation.

In a preferred embodiment, the air gap plane is substantially perpendicular to the horizontal plane.

As a preferred embodiment, the axis of rotation and the horizontal plane are substantially parallel.

As a preferred embodiment, the agitator tank, the motor, and the rotation axis are coaxially disposed.

In a preferred embodiment, the stator is located between the rotor and the support surface and is fixed to the support surface, and the rotor is connected to the agitator tank.

As a preferred embodiment, the support frame comprises:

a support leg;

the casing, the casing includes holding surface, connection face, and extend connect in the holding surface with lateral surface between the connection face, the lateral surface connect in on the stabilizer blade, the agitator tank connect in on the connection face.

As a preferred embodiment, the motor is a disc motor.

According to another object of the present invention, there is also provided an assembling method of a top drive apparatus, comprising the steps of:

(a) providing an electric machine comprising a stator and a rotor, the stator and the rotor being parallel to form an air gap surface therebetween;

(b) and connecting the motor to the supporting surface of the supporting frame in a manner that the air gap surface and the supporting surface are approximately parallel, and connecting the motor with the stirring tank in a transmission manner.

In a preferred embodiment, the motor rotates the stirring tank around a rotation axis, and the air gap surface is approximately vertical to the rotation axis;

and/or the air gap surface is substantially perpendicular to the horizontal plane.

According to another object of the invention, the invention further provides a mixer truck, which comprises the upper-mounted driving device of the embodiment, and further comprises a chassis which is horizontally arranged, and the supporting frame is fixed on the chassis.

Compared with the prior art, the technical scheme has the following advantages:

the air gap surface is approximately parallel to the supporting surface, the air gap surface is approximately vertical to the horizontal plane, the air gap surface is approximately vertical to the rotating axis, the distance between the gravity center of the disc type motor and the supporting frame is shortened, the motor bending moment is smaller, the motor mounting stability is effectively improved, and the supporting frame load is reduced. In addition, because the air gap surface is approximately vertical to the horizontal plane, the load of the support frame is smaller when the motor model is changed (for example, the air gap surface is increased) in the design process, the air gap surface and the volume of the motor are only adjusted and changed in the vertical direction, the support frame does not need to be changed or added, the design space is favorably expanded, and the stability of motor installation is ensured.

The invention is further explained by the following combined with the drawings and the embodiments.

Drawings

FIG. 1 is a schematic structural diagram of an upper driving device of an embodiment of a conventional mixer truck;

FIG. 2 is a force diagram of the upper drive unit of FIG. 1;

FIG. 3 is a schematic structural diagram of an upper-mounted driving device of another embodiment of a prior mixer truck;

FIG. 4 is a force diagram of the upper drive unit of FIG. 3;

FIG. 5 is a schematic structural diagram of a first embodiment of the upper driving device according to the present invention;

FIG. 6 is a force diagram of the upper drive unit of FIG. 5;

FIG. 7 is a schematic structural diagram of a second embodiment of the upper mounting driving device according to the present invention;

fig. 8 is a force-bearing principle diagram of the upper-mounted driving device in fig. 7.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

As shown in fig. 5 to 8, the upper driving apparatus 100 includes:

a support 120, said support 120 having a support surface 1201;

the

motors

110a and 110b, the

motors

110a and 110b comprise

stators

111a and 111b and

rotors

112a and 112b, the

stators

111a and 111b and the

rotors

112a and 112b are parallel, and form air gap surfaces 113a and 113b between the stators 111a and the rotors 111b and the

rotors

112a and 112b, and the

motors

110a and 110b are connected to the supporting surface 1201 in a mode that the air gap surfaces 113a and 113b are approximately parallel to the supporting surface 1201;

the stirring tank 130 is connected to one side of the support frame 120 far away from the supporting surface 1201, and is driven by the

disc motors

110a and 110b to rotate around a rotation axis D.

Because the

motors

110a and 110b are connected to the supporting surface 1201 in a manner that the air gap surfaces 113a and 113b are approximately parallel to the supporting surface 1201, the distance from the gravity centers of the

motors

110a and 110b to the supporting frame 120 can be shortened, the moment arm is smaller, the generated bending moment is smaller, the mounting stability and reliability of the motors are improved, and the phenomenon that the supporting frame 120 cannot bear the self weight of the motors to break and the like is avoided. In the design process of increasing the motor torque by increasing the air gap surface, the moment arm is always kept in a smaller range, the load on the support frame 120 is smaller, and the design space is enlarged.

Compared with the prior art that a high-speed-ratio reduction gearbox is adopted, the defects of high cost, high maintenance difficulty and the like caused by the use of the high-speed-ratio reduction gearbox are overcome. And this application can directly with

motor

110a, 110b support in on the holding surface 1201, not only simple structure, the equipment is convenient, stable in structure moreover.

Compared with the prior art that a large-torque motor is adopted, the air gap surfaces 113a and 113b influencing the torque are arranged close to and parallel to the supporting surface 1201, so that the

motors

110a and 110b can be stably supported on the supporting surface 1201 no matter how the sizes of the air gap surfaces 113a and 113b are changed, an additional supporting structure is not needed to be added, and the cost is effectively reduced.

It should be noted that "approximately" in the present embodiment means close to or completely identical to each other. For example, the air gap surfaces 113a, 113b and the support surface 1201 are substantially parallel, wherein the air gap surfaces 113a, 113b and the support surface 1201 are completely parallel, or the air gap surfaces 113a, 113b and the support surface 1201 are nearly parallel. Herein, approximately parallel means that the angle between the two is less than 30 °, etc., i.e., negligible.

The disc motors satisfy the structure of the

motors

110a and 110b, and the present embodiment provides two disc motors (i.e. a first disc motor 110a and a second disc motor 110b) with different air gap surface lengths to respectively describe the mounting manners on the supporting surface 1201, specifically as follows:

fig. 5 and 6 are schematic structural diagrams illustrating a first embodiment of the top-loading driving device according to the present invention, which employs a first disk motor 110a, where the first disk motor 110a includes a first stator 111a and a first rotor 112a, the first stator 111a is parallel to the first rotor 112a, and a first air gap surface 113a is formed therebetween, and the first disk motor 110a is connected to the supporting surface 1201 in a manner that the first air gap surface 113a is substantially parallel to the supporting surface 1201.

The first stator 111a is located between the first rotor 112a and the supporting surface 1201, the first stator 111a can be fixed on the supporting frame 120, that is, the first stator 111a and the supporting frame 120 are kept fixed, while the first rotor 112a rotates relative to the first stator 111a, and the first rotor 112a is connected with the stirring tank 130 to drive the stirring tank 130 to rotate, for example, the first rotor 112a is connected with a rotating shaft, the rotating shaft penetrates through the first stator 111a to be connected with the stirring tank 130, so that the first rotor 112a drives the stirring tank 130 to rotate around the rotating shaft axis, and it can be seen that the rotating shaft and the rotating axis D are coaxially arranged. In addition, in the motor structure, the mass of the stator is heavier than that of the rotor, and the present embodiment adopts the first stator 111a disposed between the first rotor 112a and the supporting surface 1201, so that the bending moment of the center of gravity of the first disc motor 110a is smaller. Specifically, the axis of the rotating shaft may be located on the center of the first stator 111a and the first rotor 112a, and it can be seen that the rotating shaft, the first stator 111a and the first rotor 112a are coaxially arranged, that is, the first disc motor 110a and the rotation axis D are coaxially arranged. Of course, the agitator tank 130 may be coaxially disposed with the rotation axis D so that the first disk motor 110a rotates the agitator tank 130 to agitate the concrete. The inside of the supporting frame 120 may be provided with a speed reducer, etc., which is respectively connected to the rotating shaft and the stirring tank 130.

The motor bending moment can be calculated by adopting the following formula: m ═ F × L.

Wherein M refers to motor bending moment; f refers to the gravity center stress of the motor, and the gravity center stress of the motor is related to the weight of the motor; l is the moment arm, which is the distance from the center of gravity of the motor to the bending point on the support surface 1201. According to the above calculation formula, the following is obtained by calculation:

the bending moment M of the first disc motor 110a is F1 × L1, refer to fig. 6;

the bending moment M of the third motor 110c is F3 × L3, refer to fig. 2;

the bending moment M of the fourth motor 110d is F4 × L4, refer to fig. 4.

Wherein, L4 is greater than L3 is greater than L1, F4 is greater than F3 is greater than or equal to F1, it can be seen that the bending moment of the fourth motor 110d is the largest, and under the same motor weight, the bending moment of the third motor 110c is obviously greater than that of the first disc motor 110 a. It can be seen that the distance between the center of gravity of the first disc motor 110a and the support frame 120 is relatively small, that is, the moment arm L1 is relatively small, so as to avoid the damage phenomenon caused by the fact that the support frame 120 cannot bear the bending moment and the shearing force caused by the self-weight of the motor, thereby ensuring the stability and the reliability of the motor installation.

Further, fig. 1 and 2 show an upper driving device of an embodiment of a conventional mixer truck, which is fixed on a horizontally disposed chassis 200, the upper driving device 100 includes a third motor 110c, a supporting frame 120 and a mixing tank 130, the supporting frame 120 is fixed on the chassis 200, and the third motor 110c is fixed on a supporting surface 1201 of the supporting frame 120 and is in transmission connection with the mixing tank 130, so that the third motor 110c drives the mixing tank 130 to rotate to mix concrete in the mixing tank 130. The third motor 110c includes a third rotor 112c and a third stator 111c, the third stator 111c of the third motor 110c is sleeved outside the third rotor 112c to form a third air gap surface 113c therebetween, at this time, the third air gap surface 113c is axially parallel to the third motor 110c and perpendicular to the supporting surface 1201 on the supporting frame 120, and as the third motor 110c and the stirring tank 130 are integrally disposed in an inclined manner with respect to the chassis 200, the third air gap surface 113c is substantially parallel to the horizontal plane, referring to fig. 2, at this time, the center of gravity of the third motor 110c extends along the third air gap surface 113c direction and is disposed far away from the supporting surface 1201, so that the moment arm L3 is long, and the motor bending moment is increased. At this time, the supporting frame 120 cannot bear the bending moment and the shearing force caused by the self weight of the third motor 110c, and is prone to cracking.

Fig. 3 and 4 show an upper driving device of another embodiment of a mixer truck in the prior art, which employs a fourth motor 110d, wherein the fourth motor 110d includes a fourth rotor 112d and a fourth stator 111d, and the fourth stator 111d is sleeved on the fourth rotor 112d to form a fourth air gap surface 113d therebetween. The fourth motor 110d is also disposed on the supporting frame 120 in a manner that the fourth air gap surface 113d is perpendicular to the supporting surface 1201, although the motor torque is increased due to the lengthening of the fourth air gap surface 113d, the center of gravity of the fourth motor 110d is farther from the supporting frame, the moment arm L4 is longer, referring to fig. 4, so that the motor bending moment is greatly increased, and the supporting frame load is larger, thereby further reducing the stability and reliability of the motor.

In contrast, the first disc motor 110a of the present embodiment is connected to the supporting surface 1201 in a manner that the air gap surface 113a and the supporting surface 1201 are substantially parallel, so that the distance from the center of gravity of the first disc motor 110a to the supporting frame 120 can be shortened, and the moment arm is smaller, so that the generated bending moment is smaller, the motor installation stability and reliability are improved, and the phenomenon that the supporting frame 120 cannot bear the self weight of the motor to break or the like is avoided.

Referring to fig. 6, the first disc motor 110a has a flat shape, that is, the axial dimension of the first disc motor 110a is small, and it can be seen that the axial dimensions of the first stator 111a and the first rotor 112a are also small. Due to the distance from the center of gravity of the first disc motor 110a to the supporting surface 1201, only one first stator 111a is spaced, and due to the smaller axial dimension of the first stator 111a, the moment arm of the first disc motor 110a is smaller. And the first air gap surface 113a and the supporting surface 1201 are substantially parallel, so that the first air gap surface 113a can be attached to the supporting frame 120, to further shorten the distance between the center of gravity of the first disc motor 110a and the supporting frame 120, so that the bending moment of the center of gravity of the first disc motor 110a is further reduced.

As shown in fig. 5 and 6, the first disc motor 110a, the support bracket 120 and the agitator tank 130 are arranged from left to right, the center of gravity of the first disc motor 110a, and the centers of the agitator tank 130 and the support bracket 120 may be located on the rotation axis D, respectively, wherein the center of gravity of the first disc motor 110a is located between the first stator 111a and the first rotor 112 a. So that the agitation tank 130, the

disk motors

110a, 110b, and the rotation axis D are coaxially disposed.

Referring to fig. 6, the axis of rotation D is substantially parallel to the horizontal plane, i.e. the angle between the two is small. When there is an angle between the rotation axis D and the horizontal plane, the rotation axis D is disposed obliquely to the horizontal plane in a left-low-right-high manner.

With continued reference to fig. 6, since the first stator 111a and the first rotor 112a are perpendicular to the rotation axis D, respectively, a first air gap surface 113a is seen between the first stator 111a and the first rotor 112a, which is substantially perpendicular to the rotation axis D.

In addition, since the first air gap surface 113a is substantially parallel to the support surface 1201, the first air gap surface 113a is substantially perpendicular to the horizontal plane.

As can be seen from the above description, the first air gap surface 113a is substantially parallel to the horizontal plane, the first air gap surface 113a is substantially perpendicular to the rotation axis D, and the first air gap surface 113a is substantially perpendicular to the horizontal plane, so that the distance between the center of gravity of the first disc motor 110a and the support frame 120 can be reduced, the motor bending moment is reduced, the motor mounting stability is effectively improved, and the load on the support frame 120 is reduced.

As shown in fig. 5, the support frame 120 includes:

a leg 122;

the housing 121 comprises a supporting surface 1201, a connecting surface 1202, and an outer side surface 1203 extending and connected between the supporting surface 1201 and the connecting surface 1202, wherein the outer side surface 1203 is connected to the supporting leg 122, and the stirring tank 130 is connected to the connecting surface 1202.

The housing 121 is fixed to the horizontally disposed base plate 200 by the support legs 122, wherein the support surface 1201 and the connection surface 1202 are disposed substantially perpendicular to a horizontal plane, and the support surface 1201, the connection surface 1202 and the first air gap surface 113a are disposed substantially in parallel, so that the first disc motor 110a, the support frame 120 and the agitator tank 130 are attached more compactly.

Fig. 7 and 8 show a structural schematic diagram of a second embodiment of the top-mount driving apparatus according to the present invention, which employs a second disc motor 110b having a torque larger than that of the first disc motor 110a, the second disc motor 110b includes a second stator 111b and a second rotor 112b, the second stator 111b and the second rotor 112b are parallel to each other and form a second air gap surface 113b therebetween, the second disc motor 110b is connected to the supporting surface 1201 in a manner that the second air gap surface 113b and the supporting surface 1201 are substantially parallel to each other, the second air gap surface 113b is substantially perpendicular to the rotation axis D, and the second air gap surface 113b is substantially perpendicular to the horizontal plane.

The top mount drive of the second embodiment is different from the first embodiment in that the second air gap surface 113b is larger than the first air gap surface 113a, the second air gap surface 113b extends only in the vertical direction because the second air gap surface 113b is substantially perpendicular to the horizontal plane, it can be seen that the volume of the second disc motor 110b also extends in the vertical direction, while the center of gravity of the second disc motor 110b moves less in the horizontal direction, and the moment arm L2 is maintained at approximately the moment arm L1, see fig. 6 and 8.

Further, according to the calculation formula of the bending moment, the following calculation results are obtained: the bending moment M of the second disc motor 110b is F2 × L2, refer to fig. 8.

Since the second air gap surface 113b is substantially perpendicular to the horizontal plane, the volumes of the second air gap surface 113b and the second disc motor 110b extend only in the vertical direction, and the moment arms of the two are kept to be changed in a small range relative to the first disc motor 110a, thereby enlarging the design space.

In the existing motor redesign process, that is, when the third motor 110c is redesigned to be the fourth motor 110d with a larger air gap surface, referring to fig. 1 to 4, although the motor torque is increased due to the lengthening of the fourth air gap surface 113d, the center of gravity of the fourth motor 110d is farther from the support frame, the moment arm L4 is longer, referring to fig. 4, so that the motor bending moment is greatly increased, and the support frame load is larger, thereby further reducing the stability and reliability of the motor. Therefore, the bending moment of the motor is large at present, the motor is difficult to be supported by the support frame, and the installation stability of the motor is influenced. In the design process of motor torque conversion, the load on the support frame is large, and the design space is limited.

In summary, in the air gap surface enlarging design of the prior art, the motor and the air gap surface extend in the horizontal direction, so that the distance between the center of gravity of the motor and the support frame 120 is increased, and it can be seen that in the air gap surface adjusting design of the prior art, the adjusting range of the moment arm is large, and the design space is limited. In the present embodiment, the second air gap surface 113b and the supporting surface 1201 are substantially parallel, so that the moment arm changes in a small range regardless of the change of the air gap surface. In addition, in the prior art, once the motor and the air gap surface are extended along the horizontal direction, a fixing structure is required to be added to support the motor, and the motor and the air gap surface of the embodiment are always attached to the support frame, so that the structure is not required to be additionally arranged to fix, the cost is reduced, the installation stability of the motor can be ensured, and the design space can be enlarged.

As shown in fig. 5 to 8, the present invention also provides an assembling method of the upper driving device 100, including the steps of:

(a) providing a

motor

110a, 110b, said

motor

110a, 110b comprising a

stator

111a, 111b and a

rotor

112a, 112b, said

stator

111a, 111b and said

rotor

112a, 112b being parallel to form an

air gap surface

113a, 113b therebetween;

(b) the

motors

110a and 110b are connected to the supporting surface 1201 of the supporting frame 120 in a manner that the air gap surfaces 113a and 113b are substantially parallel to the supporting surface 1201, and are in transmission connection with the stirring tank 130, so as to drive the stirring tank 130 to rotate around the rotation axis D.

The air gap surfaces 113a and 113b are approximately parallel to the supporting surface 1201, the air gap surfaces 113a and 113b are approximately vertical to the horizontal plane, and the air gap surfaces 113a and 113b are approximately vertical to the rotation axis D, so that the distance between the gravity centers of the

motors

110a and 110b and the supporting frame 120 is reduced, the motor bending moment is smaller, the motor mounting stability is effectively improved, and the load of the supporting frame 120 is reduced. In addition, because the air gap surfaces 113a and 113b are approximately vertical to the horizontal plane, the load on the support frame 120 caused by the change of the motor model (for example, the air gap surface is increased) in the design process is smaller, the air gap surface and the volume of the motor are adjusted and changed only in the vertical direction, the support frame does not need to be changed or added, the design space is favorably expanded, and the stability of the motor installation is ensured.

The disc motor satisfies the structure of the

motors

110a and 110b, and specific contents can refer to the description in the upper driving device 100, which is not repeated herein.

As shown in fig. 5 to 8, the present invention further provides a mixer truck, which includes the upper driving device 100 of the above embodiment, and further includes a chassis 200 horizontally disposed, and the supporting frame 120 is fixed on the chassis 200.

Since the mixer truck adopts the upper driving device 100, the mixer truck can refer to the upper driving device 100 of the above embodiment.

The above-mentioned embodiments are only for illustrating the technical idea and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the scope of the present invention is not limited by the embodiments, i.e. all equivalent changes or modifications made according to the spirit of the present invention will still fall within the scope of the present invention.

Claims

1. A top loading drive device (100), comprising:

a support frame (120), the support frame (120) having a support surface (1201);

a motor (110a, 110b), the motor (110a, 110b) comprising a stator (111a, 111b) and a rotor (112a, 112b), the stator (111a, 111b) and the rotor (112a, 112b) being parallel and forming an air gap surface (113a, 113b) therebetween, the motor (110a, 110b) being connected to the support surface (1201) in such a manner that the air gap surface (113a, 113b) and the support surface (1201) are substantially parallel;

a stirring tank (130), wherein the stirring tank (130) is connected to one side of the support frame (120) far away from the support surface (1201) and is driven by the motors (110a, 110b) to rotate around a rotation axis (D).

2. The upper assembly drive (100) according to claim 1, wherein the air gap surfaces (113a, 113b) are substantially perpendicular to the axis of rotation (D);

and/or the air gap surfaces (113a, 113b) are substantially perpendicular to the horizontal plane.

3. The upper assembly drive (100) according to claim 1, wherein said rotation axis (D) is substantially parallel to a horizontal plane.

4. The top loading drive device (100) according to any of the claims 1 to 4, wherein the agitator tank (130), the motor (110a, 110b) and the rotation axis (D) are coaxially arranged.

5. The upper assembly drive (100) according to claim 1, wherein the stator (111a, 111b) is positioned between the rotor (112a, 112b) and the support surface (1201) and is fixed to the support surface (1201), the rotor (112a, 112b) being connected to a stirring tank (130).

6. The upper mount drive (100) of claim 1, wherein the support bracket (120) comprises:

a foot (122);

the stirring tank comprises a shell (121), wherein the shell (121) comprises a supporting surface (1201), a connecting surface (1202) and an outer side surface (1203) which extends and is connected between the supporting surface (1201) and the connecting surface (1202), the outer side surface (1203) is connected to the supporting leg (122), and the stirring tank (130) is connected to the connecting surface (1202).

7. The upper assembly drive (100) according to any one of claims 1 to 6, wherein the motor (110a, 110b) is a disc motor.

8. A method of assembling a top drive (100), comprising the steps of:

(a) providing an electric machine (110a, 110b), said electric machine (110a, 110b) comprising a stator (111a, 111b) and a rotor (112a, 112b), said stator (111a, 111b) and said rotor (112a, 112b) being parallel to form an air gap face (113a, 113b) therebetween;

(b) and connecting the motors (110a, 110b) to the supporting surface (1201) of the supporting frame (120) in a manner that the air gap surfaces (113a, 113b) are approximately parallel to the supporting surface (1201), and connecting the motors with the stirring tank (130) in a transmission manner.

9. The assembly method according to claim 8, wherein the motor (110a, 110b) rotates the agitator tank (130) about a rotation axis (D), the air gap surface (113a, 113b) and the rotation axis (D) being substantially perpendicular;

10. A mixer truck, characterized in that it comprises an upper-mounted drive (100) according to any one of claims 1 to 7, and in that it further comprises a horizontally arranged chassis (200), said support frame (120) being fixed to said chassis (200).