Pull-in stop structure of tractor

Abstract

The utility model discloses a pull-in stop structure of a tractor, which comprises a shell, a coil framework, a motor, a traction wheel mechanism and a stop mechanism, the coil framework and the motor are arranged in the shell, the traction wheel mechanism and the stop mechanism are arranged on the coil framework, and an output gear is arranged on the axis of motor magnetic steel. The traction wheel mechanism comprises a cam assembly parallel to the axis of the motor, a transmission assembly and a traction wheel assembly. The transmission assembly is connected with the output end of the motor in a matched mode. The cam assembly is used for controlling joint and separation of power transmission between the traction wheel assembly and the transmission assembly, the stopping mechanism comprises an electric suction element and a brake arm driven by the electric suction element to swing, and a stopping protruding part is arranged on the cam assembly and used for stopping the traction wheel assembly and the transmission assembly. The brake arm enters the rotating track of the stopping protruding part in the radial direction of the cam assembly and abuts against the stopping protruding part, and the transmission assembly is in transmission connection with the traction wheel assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of traction devices for washing machines, in particular to a suction stop structure of traction devices. Background Art

[0002] At present, the washing machine traction device on the market, such as the text disclosed in the invention patent application with publication number "CN116334888A", includes a traction wheel assembly and a driving motor providing output of the traction wheel assembly. The traction wheel assembly is connected with a wire rope, and the wire rope is driven by the rotation of the traction wheel, thereby pulling the load to realize the traction work of the traction device. The traction wheel assembly also includes a stop wheel, which is locked when the traction device is powered on, so that the action end of the planetary reduction gear set on one side of the stop wheel rotates, thereby driving the traction gear and the wire rope to wind.

[0003] A locking structure of a stop wheel for a washing machine tractor in the prior art locks the stop wheel by setting an action of a stop lever. However, the action direction of the stop lever is about vertical swing, and the mounting shaft of the stop wheel in the tractor housing is also vertically arranged, which will cause the stop wheel to abut against the end of the stop lever in the vertical direction. In this case, the stop lever cannot enter the rotation track of the stop wheel, resulting in the inability to lock the stop wheel, causing the function of the tractor to fail to be realized. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a suction stop structure for a tractor.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions: A pull-on stop structure of a tractor, comprising: a housing, a coil frame and a motor arranged in the housing, and a traction wheel mechanism and a stop mechanism arranged on the coil frame, an output gear is arranged on the axis of the motor magnetic steel, the traction wheel mechanism comprises a cam assembly, a transmission assembly and a traction wheel assembly arranged parallel to the motor axis, and the transmission assembly is matched and connected with the output end of the motor;

[0006] The cam assembly is used to control the engagement and disengagement of power transmission between the traction wheel assembly and the transmission assembly. The stop mechanism includes an electric suction element and a brake arm driven to swing by the electric suction element. A stop convex portion is provided on the cam assembly. The brake arm enters the rotation trajectory of the stop convex portion along the radial direction of the cam assembly and abuts against the stop convex portion. The transmission assembly and the traction wheel assembly form a transmission connection.

[0007] Furthermore, the transmission assembly includes a planetary wheel driven to rotate by an output gear, an outer gear ring meshed with the outer periphery of the planetary wheel, and a transmission wheel frame, the planetary wheel is arranged on the transmission wheel frame, the transmission wheel frame is provided with an output tooth portion, the cam assembly is locked with the outer gear ring, and forces the planetary wheel to rotate around the axis of the transmission wheel frame to rotate the transmission wheel frame.

[0008] Furthermore, the coil frame also defines a control area located on one side of the motor magnetic steel axis, the axes of the cam assembly, the transmission assembly and the traction wheel assembly are arranged away from the control area in sequence, and the stop mechanism is arranged in the control area.

[0009] Furthermore, the stop mechanism includes a bracket arranged on the end face of the coil skeleton, and an electromagnetic relay fixed on the bracket. The bracket is also provided with a connecting frame for the middle part of the brake arm to swing thereon. One end of the brake arm is connected to the electromagnetic relay, and the other end is arranged toward the cam assembly. The electromagnetic relay is arranged radially with respect to the cam assembly, and the brake arm is arranged parallel to the rotation plane of the cam assembly.

[0010] Furthermore, the coil frame is arranged in a ring shape, the output gear is arranged in the middle of the coil frame, and the brake arm is arranged above the end surface of the coil frame and on the outside of the cam assembly in the circumferential direction.

[0011] Furthermore, the connecting frame is provided with connecting parts spaced apart from each other in upper and lower directions, and the brake arm is provided with a movable groove corresponding to the connecting parts, so as to allow the brake arm to swing with the connecting parts as a fulcrum.

[0012] Furthermore, a torsion spring is connected to the brake arm, and one end of the torsion spring is connected to the end of the bracket, and the other end is connected to the brake arm and corresponds to between the connecting frame and the cam assembly.

[0013] Furthermore, a contact piece assembly is provided on the coil frame. The contact piece assembly is located on the side of the output gear axis away from the cam assembly. The contact piece assembly is adjacent to the end face of the coil frame and is arranged at the bottom of the traction wheel assembly.

[0014] Furthermore, the stop protrusion has a stop surface arranged opposite to the brake arm, and a guide inclined surface arranged away from the brake arm.

[0015] Furthermore, a clamping plate is provided on the coil frame, and the contact piece assembly and the stop mechanism are arranged on the clamping plate, and the clamping plate extends from the control area to the inner cavity end of the shell.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] In the utility model, the cam assembly is locked by a stop mechanism to realize power transmission between the subsequent transmission assembly and the traction wheel assembly, and the stop mechanism is configured to execute the locking action of the cam assembly when energized. During the action, the brake arm enters the rotation track of the stop convex portion from the radial outer side of the cam assembly, so that when the driving force of the motor is transmitted to the cam assembly and drives the cam assembly to rotate, and when the brake arm is driven to swing toward the cam assembly, no sliding occurs between the brake arm and the stop convex portion, thereby ensuring the normal operation of the traction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the plane layout of the utility model;

[0020] Figure 3 It is a schematic diagram of the cooperation between the stop mechanism and the cam assembly of the utility model;

[0021] Figure 4 It is an explosion diagram of the utility model;

[0022] Figure 5 It is an exploded schematic diagram of the transmission assembly of the utility model;

[0023] Figure 6 It is an exploded schematic diagram of the planetary gear, the transmission wheel carrier and the outer gear ring of the utility model;

[0024] Figure 7 It is a structural schematic diagram of the contact piece assembly of the utility model;

[0025] Figure 8 It is a partial exploded schematic diagram of the bracket and traction wheel assembly of the utility model;

[0026] In the figure: 1, housing; 2, coil frame; 2.1, control area; 3, motor magnet; 3.1, output gear; 4, cam assembly; 4.1, stop convex part; 4.11, stop surface; 4.12, guide slope;

[0027] 5. Transmission assembly; 5.1. Planetary gear; 5.2. Outer gear ring; 5.3. Transmission wheel frame; 5.4. Output gear; 5.5. Transmission wheel; 6. Traction wheel assembly; 6.1. Traction wheel; 6.2. Control wheel; 6.21. First action section; 6.22. Second action section; 6.23. Third action section; 6.3. Driving wheel;

[0028] 7. Stop mechanism; 7.1. Electric suction element; 7.2. Brake arm; 7.21. Movable groove; 7.3. Bracket; 7.4. Connecting frame; 7.5. Connecting part;

[0029] 8. Torsion spring; 9. Contact piece assembly; 9.1. First contact piece; 9.2. Second contact piece; 9.3. Third contact piece; 9.4. Positioning frame; 10. Clamp; 10.1. Limit seat; 11. Transition gear set; DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be understood that although the terms upper, middle, lower, top, end, etc. appear in this article to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for easy understanding, and are not used to define any direction or order limitation.

[0032] like Figure 1-8 As shown, a suction stop structure of a tractor comprises:

[0033] A housing 1, a coil frame 2 and a motor magnet 3 arranged in the housing 1, and a traction wheel mechanism and a stop mechanism 7 arranged on the coil frame 2, an output gear 3.1 is arranged on the axis of the motor magnet 3, and when the coil frame 2 is energized, the output gear 3.1 rotates. The above-mentioned coil frame 2, motor magnet 3 and output gear 3.1 together constitute a motor.

[0034] The coil frame 2 is arranged in a ring shape, and a control area 2.1 is arranged on the outer edge of the coil frame 2. The control area 2.1 is specifically located on the center line of the coil frame 2, so that the coil frame 2 is a substantially symmetrical structure;

[0035] The traction wheel mechanism includes a cam assembly 4, a transmission assembly 5 and a traction wheel assembly 6 which are arranged parallel to the axis of the output gear 3.1. The transmission assembly 5 is connected with the output gear 3.1. A steel wire rope is connected to the traction wheel assembly 6. The output gear 3.1 provides power to drive the traction wheel assembly 6 to drive the steel wire rope to apply load.

[0036] like Figure 3As shown, the cam assembly 4 is used to control the engagement and disengagement of the power transmission between the traction wheel assembly 6 and the transmission assembly 5. The stop mechanism 7 includes an electric suction element 7.1 and a brake arm 7.2 driven by the electric suction element 7.1 to swing. The cam assembly 4 is provided with a stop convex portion 4.1. When the coil skeleton 2 is energized, the stop mechanism 7 is energized synchronously, and the electric suction element 7.1 drives the brake arm 7.2 to swing, so that the brake arm 7.2 enters the rotation trajectory of the stop convex portion 4.1 along the radial direction of the cam assembly 4 and abuts against the stop convex portion 4.1. At this time, the transmission assembly 5 and the traction wheel assembly 6 form a transmission connection, that is, the engagement of power transmission.

[0037] Combination Figure 1 and Figure 2 As shown, the brake arm 7.2 is arranged above the end surface of the coil skeleton 2 and on the outside of the cam assembly 4 in the circumferential direction. The brake arm 7.2 swings from the radial outside of the cam assembly 4 into the rotation trajectory of the stop protrusion 4.1, and the swinging direction of the brake arm 7.2 is located on the circumferential surface of the cam assembly 4 and is parallel to the rotation plane of the cam assembly 4. Therefore, when the cam assembly 4 swings during the rotation process, the brake arm 7.2 can ensure that the brake arm 7.2 reaches the stop position to form a lock with the stop protrusion 4.1, thereby avoiding the brake arm 7.2 and the stop protrusion 4.1 sliding at the stop position and causing the traction device to fail.

[0038] It should be pointed out that the transmission assembly 5 specifically refers to a planetary reduction gear structure. Under the premise that the cam assembly 4 is stopped by the brake arm 7.2, the cam assembly 4 meshes with the outer ring gear 5.2 of the planetary reduction gear structure, thereby organizing the outer ring gear 5.2 to rotate, thereby forcing the planetary gear 5.1 inside the outer ring gear 5.2 to rotate around the center line of the planetary reduction gear structure, thereby increasing the reduction ratio of the tractor and achieving stable operation of the tractor. Therefore, it is necessary to set the cam assembly 4 and the brake arm 7.2 for stopping to achieve power transmission between the traction wheel assembly 6 and the transmission assembly 5, otherwise the power transmission of the tractor is separated. In other words, when the cam assembly 4 rotates, the power from the output gear 3.1 cannot be transmitted to the traction wheel assembly 6.

[0039] like Figure 2 and Figure 4As shown, specifically, the transmission assembly 5 also includes a transition gear set 11, and the axes of the cam assembly 4, the planetary reduction gear set, the transition gear set 11 and the traction wheel assembly 6 are vertically disposed on the end face of the coil skeleton 2, and are sequentially arranged in a circle around the central axis of the output gear 3.1 from one side of the control area 2.1 on the coil skeleton 2. The axes of the cam assembly 4, the transmission assembly 5 and the traction wheel assembly 6 are sequentially arranged away from the control area 2.1, wherein the stop mechanism 7 is specifically arranged on the control area 2.1, and a contact piece assembly 9 is also provided on the side of the coil skeleton 2 located at the central axis of the output gear 3.1 away from the cam assembly 4. The contact piece assembly 9 is used to control the opening and closing of the motor. Through the above improvements, the spatial arrangement inside the traction device is optimized, and the overall volume of the traction device is reduced while ensuring the compactness of the internal structure.

[0040] It is worth mentioning that the contact piece assembly 9 is arranged on the end face of the coil frame 2 and is arranged at the lower part of the traction wheel assembly 6. The traction wheel assembly 6 includes a traction wheel 6.1 located at the upper part of the axis, and a control wheel 6.2 located at the lower part of the axis and adjacent to the end face of the coil frame 2. The control wheel 6.2 rotates coaxially with the traction wheel 6.1 and controls the on and off of the contact piece assembly 9 under the drive of the output gear 3.1.

[0041] Reference Figure 4 , Figure 7 and Figure 8 Specifically, a clamping plate 10 is further provided on the coil skeleton 2, and the contact piece assembly 9 and the stop mechanism 7 are arranged on the clamping plate 10. The clamping plate 10 mainly provides an installation position for the electric suction element 7.1 and the contact piece assembly 9. The clamping plate 10 extends from the control area 2.1 to the inner cavity end of the shell 1, wherein the inner cavity contour of the shell 1 is larger than the projection surface of the coil skeleton 2, so that the above-mentioned gear component can extend on the outside of the coil skeleton 2, and the contact piece assembly 9 can be arranged using the space on the end surface of the coil skeleton 2 between the traction wheel assembly 6 and the control area 2.1.

[0042] The clamping plate 10 is fixed in the control area 2 . 1 of the coil frame 2 by buckling, and the shaft end of the traction wheel assembly 6 passes through the clamping plate 10 and is positioned on the coil frame 2 to further fix the clamping plate 10 .

[0043] In this embodiment, by adjusting the position of the contact assembly 9 and the clamping plate 10 to the end face of the coil skeleton 2, and horizontally setting the electric suction element 7.1 on the control area 2.1, and the brake arm 7.2 is a vertically set plate, so that the brake arm 7.2 only occupies the horizontal transverse space on the end face of the coil skeleton 2, and the electric suction element 7.1 occupies the horizontal longitudinal space on the end face of the coil skeleton 2 with the help of the extension part of the control area 2.1 on the coil skeleton 2, thereby solving the problem of the traction device's excessive height in the vertical direction, and effectively reducing the overall volume of the traction device to meet more assembly environments.

[0044] like Figures 4 to 6 As shown, as a further embodiment of the transmission assembly 5, the transmission assembly 5 includes a planetary gear 5.1 driven to rotate by the output gear 3.1, an outer gear ring 5.2 meshed with the outer periphery of the planetary gear 5.1, and a transmission wheel carrier 5.3, wherein the outer gear ring 5.2 includes an inner gear portion and an outer gear portion, the inner gear portion meshes with the planetary gear 5.1, and the outer gear portion remains meshed with the cam assembly 4, the transmission wheel carrier 5.3 is covered on the outer gear ring 5.2 and the planetary gear 5.1, and a connecting column for connecting the planetary gear 5.1 is provided at the bottom of the transmission wheel carrier 5.3, An output tooth portion 5.4 is provided at the upper end of the transmission wheel frame 5.3, and the output tooth portion 5.4 is used to output the transmission force of the motor to the traction wheel assembly 6. When the motor is energized, the electric suction element 7.1 is also energized. At this time, the cam assembly 4 is locked by the brake arm 7.2. At the same time, since the cam assembly 4 is meshed with the outer gear ring 5.2, the outer gear ring 5.2 is locked, thereby forcing the planetary gear 5.1 to rotate around the axis of the transmission wheel frame 5.3, so that the transmission wheel frame 5.3 rotates, and then the output tooth portion 5.4 transmits power to the traction wheel assembly 6.

[0045] The transmission assembly 5 further comprises a transmission wheel 5.5, which has a large tooth portion and a small tooth portion extending between the planetary gears 5.1 along the axis of the transmission wheel frame 5.3. The large tooth portion extends to one side of the output gear 3.1 and meshes with the output gear 3.1, and the small tooth portion meshes with the planetary gears.

[0046] Specifically, the transition gear set 11 specifically refers to a double gear. The traction wheel assembly 6 also includes a driving wheel 6.3 located between the traction wheel 6.1 and the control wheel 6.2. The driving wheel 6.3 is axially connected to the traction wheel 6.1 and the control wheel 6.2. The upper gear portion of the double gear is meshed with the output gear portion 5.4 of the transmission wheel frame 5.3, and the lower gear of the double gear is meshed with the driving wheel 6.3 in the traction wheel assembly 6, thereby driving the coaxial traction wheel 6.1 to rotate and drive the wire rope.

[0047] like Figure 7As shown, as a further explanation of the contact piece assembly 9, the contact piece assembly 9 includes a positioning frame 9.4, and a first contact piece 9.1, a second contact piece 9.2 and a third contact piece 9.3 which are sequentially arranged on the positioning frame 9.4 at intervals. The control wheel 6.2 is arranged opposite to the above-mentioned contact pieces, and the first contact piece 9.1, the second contact piece 9.2 and the third contact piece 9.3 are sequentially arranged close to the control wheel 6.2. In addition, the control wheel 6.2 is provided with a first action segment 6.21, a second action segment 6.22 and a third action segment 6.23 with outer diameters increasing sequentially. In the initial state, the third action segment 6.23 abuts against the third contact piece 9.3 and forces the first to third contact pieces 9.3 to engage with each other. When the traction wheel assembly 6 is driven to rotate, the second action segment 6.22 abuts against the third contact piece 9.3. At this time, the third contact piece 9.3 is pressed to the first The two contact pieces 9.2 are engaged, and due to the reduction in the outer diameter of the corresponding control wheel 6.2, the first contact piece 9.1 is disconnected from the second contact piece 9.2. With the further rotation of the traction wheel assembly 6, the first action section 6.21 abuts against the third contact piece 9.3. Due to the reduction in the outer diameter of the corresponding control wheel 6.2 again, the third contact piece 9.3 is disengaged from the second contact piece 9.2. At this time, the traction wheel assembly 6 has completed its stroke and the motor is disconnected. The mutual disconnection and engagement between the first contact piece 9.1, the second contact piece 9.2 and the third contact piece 9.3 is actually to give a control signal to control the rotation stroke of the motor to correspond to the traction stroke of the wire rope, and to further control the traction stroke and traction time in combination with the arc length of different action sections on the control wheel 6.2. The control signal of the contact piece assembly 9 corresponding to the rotation of the motor is a prior art and will not be elaborated here.

[0048] One end of the first action segment 6.21 is connected to the second action segment 6.22, and the other end is connected to the third action segment 6.23, so that the third action segment 6.23, the second action segment 6.22 and the first action segment 6.21 on the control wheel 6.2 can abut against the contact piece assembly 9 again.

[0049] like Figure 3 As shown, as a further implementation of the stop mechanism 7, the stop mechanism 7 includes a bracket 7.3 arranged on the end surface of the coil skeleton 2, and an electromagnetic relay fixed on the bracket 7.3. The electromagnetic relay serves as an electric suction element 7.1. The bracket 7.3 is also provided with a connecting frame 7.4 for the middle part of the brake arm 7.2 to swing thereon. One end of the brake arm 7.2 is connected to the electromagnetic relay, and the other end is arranged toward the cam assembly 4. The electromagnetic relay is arranged radially with respect to the cam assembly 4, and the brake arm 7.2 is arranged parallel to the rotation plane of the cam assembly 4. When the electromagnetic relay is energized, one end of the brake arm 7.2 is adsorbed, and the other end swings toward the stop protrusion 4.1 with the connecting frame 7.4 as a fulcrum, and the other end of the brake arm 7.2 swings in from the circumferential outer side of the rotation trajectory of the cam assembly 4 to ensure that the brake arm 7.2 and the stop protrusion 4.1 remain in the stop position.

[0050] like Figure 8 As shown, a limit seat 10.1 is provided on the clamping plate 10 for the bottom of the bracket 7.3 to be placed in order to limit the left and right movement of the bracket 7.3.

[0051] The brake arm 7.2 extends from one side of the center of the coil frame 2 to the cam assembly 4 on the other side.

[0052] In the utility model, the electric suction element 7.1 is horizontally arranged on the control area 2.1, which effectively solves the problem that the height of the electric suction element 7.1 itself causes the volume of the tractor to be too large, so that the overall height of the gear component in the tractor is reduced, and the contact assembly 9 is arranged on the side of the coil frame 2 away from the cam assembly 4, which also relatively reduces the setting height of the contact assembly 9, and the contact assembly 9 is able to extend the wire through the space between the inner cavity of the shell 1 and the outer side of the coil frame 2, and connect to the control area 2.1, so that the internal space of the shell 1 is more compact.

[0053] Specifically, the connecting frame 7.4 is provided with connecting parts 7.5 which are arranged at intervals in the upper and lower parts, and the brake arm 7.2 is provided with a movable groove 7.21 corresponding to the connecting part 7.5. The movable groove 7.21 is specifically arranged in a T-shape. The connecting part 7.5 is limited in the vertical section of the movable groove 7.21, and the horizontal section of the movable groove 7.21 allows the brake arm 7.2 to swing with the connecting part 7.5 as a fulcrum. The upper and lower connecting parts 7.5 constrain the brake arm 7.2, which is conducive to maintaining the position stability of the brake arm 7.2 when it is away from the cam assembly 4, and preventing the brake arm 7.2 from entering the rotation trajectory of the stop protrusion 4.1 when the electromagnetic relay is not energized.

[0054] Specifically, the brake arm 7.2 is also connected to a torsion spring 8, and one end of the torsion spring 8 is connected to the end of the bracket 7.3, and the other end is connected to the brake arm 7.2 and corresponds to between the connecting frame 7.4 and the cam assembly 4. The torsion spring 8 is used to provide a force to move the brake arm 7.2 away from the cam assembly 4, so that the brake arm 7.2 can be quickly reset when the electromagnetic relay is powered off.

[0055] Specifically, the stop protrusion 4.1 has a stop surface 4.11 arranged opposite to the brake arm 7.2, and a guide inclined surface 4.12 arranged away from the brake arm 7.2.

[0056] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A suction stop structure of a tractor, characterized in that: include: A housing (1), a coil frame (2) and a motor magnet (3) arranged in the housing (1), and a traction wheel mechanism and a stopper mechanism (7) arranged on the coil frame (2), an output gear (3.1) being arranged on the axis of the motor magnet (3), the traction wheel mechanism comprising a cam assembly (4) arranged parallel to the axis of the motor magnet (3), a transmission assembly (5) and a traction wheel assembly (6), the transmission assembly (5) being cooperatively connected to the output end of the motor magnet (3); The cam assembly (4) is used to control the engagement and disengagement of power transmission between the traction wheel assembly (6) and the transmission assembly (5); the stop mechanism (7) comprises an electric suction element (7.1) and a brake arm (7.2) driven by the electric suction element (7.1) to swing; a stop convex portion (4.1) is provided on the cam assembly (4); the brake arm (7.2) swings parallel to the rotation plane of the cam assembly (4) and enters the rotation track of the stop convex portion (4.1); and the brake arm (7.2) abuts against the stop convex portion (4.1) so that the transmission assembly (5) and the traction wheel assembly (6) form a transmission connection.

2. The suction stop structure of a tractor according to claim 1, characterized in that: The transmission assembly (5) comprises a planetary wheel (5.1) driven to rotate by an output gear (3.1), an outer gear ring (5.2) meshed with the outer periphery of the planetary wheel (5.1), and a transmission wheel frame (5.3), wherein the planetary wheel (5.1) is arranged on the transmission wheel frame (5.3), and the transmission wheel frame (5.3) is provided with an output tooth portion (5.4), and the cam assembly (4) is locked with the outer gear ring (5.2) and forces the planetary wheel (5.1) to rotate around the axis of the transmission wheel frame (5.3), so that the transmission wheel frame (5.3) rotates.

3. The suction stop structure of a tractor according to claim 1, characterized in that: The coil frame (2) also defines a control area (2.1) located on one side of the axis of the motor magnetic steel (3); the axes of the cam assembly (4), the transmission assembly (5) and the traction wheel assembly (6) are arranged in sequence away from the control area (2.1); and the stop mechanism (7) is arranged in the control area (2.1).

4. The suction stop structure of a tractor according to claim 1, characterized in that: The stop mechanism (7) comprises a bracket (7.3) arranged on the end surface of the coil frame (2), and an electromagnetic relay fixed on the bracket (7.3); the bracket (7.3) is also provided with a connecting frame (7.4) for the middle part of the brake arm (7.2) to swing thereon; one end of the brake arm (7.2) is connected to the electromagnetic relay, and the other end is arranged toward the cam assembly (4); the electromagnetic relay is arranged radially with respect to the cam assembly (4).

5. The suction stop structure of a tractor according to claim 1, characterized in that: The coil frame (2) is arranged in a ring shape, the output gear (3.1) is arranged in the middle of the coil frame (2), the brake arm (7.2) is arranged above the end surface of the coil frame (2) and outside the circumferential direction of the cam assembly (4), and the brake arm (7.2) is arranged parallel to the rotation plane of the cam assembly (4).

6. The suction stop structure of a tractor according to claim 4, characterized in that: The connecting frame (7.4) is provided with connecting parts (7.5) arranged at intervals up and down, and the brake arm (7.2) is provided with a movable groove (7.21) arranged corresponding to the connecting part (7.5) to allow the brake arm (7.2) to swing with the connecting part (7.5) as a fulcrum.

7. The suction stop structure of a tractor according to claim 4, characterized in that: The brake arm (7.2) is also connected to a torsion spring (8), one end of which is connected to the end of the bracket (7.3), and the other end of which is connected to the brake arm (7.2) and corresponds to between the connecting frame (7.4) and the cam assembly (4).

8. The suction stop structure of a tractor according to claim 1, characterized in that: The coil frame (2) is also provided with a contact piece assembly (9), the contact piece assembly (9) is located on the side of the output gear (3.1) axis away from the cam assembly (4), the contact piece assembly (9) is adjacent to the end surface of the coil frame (2), and is arranged at the bottom of the traction wheel assembly (6).

9. The suction stop structure of a tractor according to claim 1, characterized in that: The stop convex portion (4.1) comprises a stop surface (4.11) arranged opposite to the brake arm (7.2), and a guide inclined surface (4.12) arranged away from the brake arm (7.2).

10. The suction stop structure of a tractor according to claim 8, characterized in that: The coil frame (2) is also provided with a clamping plate (10), the contact piece assembly (9) and the stop mechanism (7) are arranged on the clamping plate (10), and the clamping plate (10) extends from the control area (2.1) to the inner cavity end of the shell (1).

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