Tractor

Abstract

The utility model provides a tractor which comprises a tractor body, two walking mechanisms and two driving mechanisms. The two walking mechanisms are connected to the left side and the right side of the vehicle body correspondingly, the two driving mechanisms are connected to the inner side of the vehicle body, and the two walking mechanisms are in transmission connection with one driving mechanism correspondingly. Each walking mechanism comprises a side frame, a crawler belt and two rotating wheel sets which are distributed front and back in a spaced mode. Each driving mechanism comprises a motor and a transmission chain wheel assembly; each driving mechanism further comprises a supporting shaft, the two ends of each supporting shaft are rotationally connected with the side vehicle frames on the corresponding sides, and the inner end of each side vehicle frame is coaxially connected with an output shaft of the motor on the corresponding side and limited in the circumferential direction. Reliability and stability of transmission connection among the motor, the transmission chain wheel assembly and the rotating wheel set can be guaranteed, and tooth skipping or noise of the transmission chain wheel assembly can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of traction device technology, and more specifically, to a tractor vehicle. Background Technology

[0002] A tractor is a traction device used to pull or move objects. Currently, Chinese Patent Publication No. CN117565985B discloses an intelligent traction robot. In the structure of this intelligent traction robot, the internal rotating wheel is connected to the output shaft of the drive motor through a driven sprocket, a transmission chain, and a driving sprocket. However, since the output shaft of the internal drive motor is a single-sided support structure, when the intelligent traction robot is subjected to a large load, the output shaft of the drive motor will deviate, which will cause the driving sprocket to become eccentric. This will cause tooth skipping and noise between the transmission chain and the driving sprocket, thus affecting the reliability and stability of the drive motor driving the rotating wheel. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a tractor that can ensure the reliability and stability of the transmission connection between the motor, the transmission sprocket assembly and the wheel assembly, and can avoid tooth skipping or noise in the transmission sprocket assembly.

[0004] This utility model provides a tractor unit, including a vehicle body, two traveling mechanisms, and two drive mechanisms. The two traveling mechanisms are respectively connected to the left and right sides of the vehicle body, and the two drive mechanisms are each connected to the inner side of the vehicle body. Each traveling mechanism is drively connected to one of the drive mechanisms. Each traveling mechanism includes a side frame, a track, and two wheel sets distributed at a front-to-back interval. The two side frames are respectively fixed to the left and right sides of the vehicle body. The two wheel sets in each traveling mechanism are rotatably connected to the corresponding side frame at a front-to-back interval. The track in each traveling mechanism is sleeved on the corresponding traveling mechanism. The two wheel sets in the structure are external; each drive mechanism includes a motor and a transmission sprocket assembly; the motor is fixed inside the body body, the wheel set located on the front side of one of the travel mechanisms is connected to the output shaft of the motor on the corresponding side through the transmission sprocket assembly on the corresponding side, and the wheel set located on the rear side of the other travel mechanism is connected to the output shaft of the motor on the corresponding side through the transmission sprocket assembly on the corresponding side; each drive mechanism also includes a support shaft, both ends of each support shaft are rotatably connected to the side frame on the corresponding side, and the inner end of each side frame is coaxially connected to the output shaft of the motor on the corresponding side and circumferentially limited.

[0005] By adopting the above structure, this utility model enables the support shaft to support the outer end of the motor's output shaft under the action of the support shaft, thus enabling the motor's output shaft to achieve two-point support. This effectively prevents the motor's output shaft from becoming eccentric when the tractor is under a large load, ensuring the reliability and stability of the transmission connection between the motor, the transmission sprocket assembly, and the wheel assembly, and preventing tooth skipping or noise in the transmission sprocket assembly.

[0006] In one possible implementation, each support shaft has a coaxially provided blind insertion hole on its inner end, and each blind insertion hole has a keyway on its side wall. The output shaft of each motor is coaxially inserted into the blind insertion hole on the corresponding side of the support shaft and is circumferentially limited by a limiting key and the keyway. With this structure, after the output shaft of the motor is coaxially inserted into the blind insertion hole on the corresponding side of the support shaft, the output shaft of the motor can abut against the inner end of the blind insertion hole to achieve axial limitation between the support shaft and the output shaft of the motor. After the keyway and the output shaft of the motor are connected by the limiting key, the support shaft can reliably achieve circumferential limitation with the output shaft of the motor.

[0007] In one possible implementation, a column with an outer diameter smaller than that of the support shaft is coaxially provided on the outer end of each support shaft. Each drive mechanism also includes a bearing housing, each bearing housing is fixed on the side frame on the corresponding side, and the column on each support shaft is rotatably connected to the bearing housing on the corresponding side. With this structure, the outer end of the support shaft can be reliably rotatably connected to the bearing housing under the rotational cooperation of the column and the bearing housing. In addition, the outer end of the support shaft abuts against the bearing housing to achieve axial limiting of the support shaft.

[0008] In one possible implementation, the motor is a brushless DC motor; by using a brushless DC motor, it has the advantages of high motor speed and large output torque, thereby improving the traction and load-bearing capacity of the tractor.

[0009] In one possible implementation, the tractor also includes a protective cover, which is installed over the two motors and fixed to the vehicle body. The protective cover protects the motors from damage caused by impact.

[0010] In one possible implementation, the protective cover has several heat dissipation holes evenly distributed on it, and a cooling fan is fixed on the side wall of the protective cover. With this structure, under the action of the cooling fan and the heat dissipation holes, when the cooling fan is working, it can dissipate heat from the motor located inside the protective cover. That is, the cooling fan can actively drive the airflow: when the cooling fan is working, it can force external cold air to be drawn into the body of the vehicle body from the gap between the track and the side frame until it enters the protective cover. The cold air entering the protective cover can flow over the surface of the motor, carrying away the heat generated by the motor during operation. Finally, the hot air is discharged through the heat dissipation holes on the protective cover. This forced convection cooling method greatly enhances the heat dissipation efficiency, significantly reduces the operating temperature of the motor, and thus improves the stability and reliability of the motor during operation.

[0011] In one possible implementation, two cooling fans are provided, each axially corresponding to one of the motors. With this structure, the cool air delivered by each cooling fan can flow through the motor along the axial direction of the motor at the corresponding position, and the cool air will wrap around the motor from the circumferential direction, thereby greatly improving the heat dissipation efficiency and effect of the motor, significantly reducing the operating temperature of the motor, and thus improving the stability and reliability of the motor during operation.

[0012] In one possible implementation, two handles are fixed to the top of the vehicle body, spaced apart front to back; the handles allow for easy handling when the tractor needs to be moved.

[0013] In one possible implementation, a connecting bracket is also fixed to the top of the vehicle body; through the setting of the connecting bracket, the connecting bracket can be connected to the towing accessories on the RV to realize the towing of the RV; of course, the connecting bracket can also adopt different types of brackets to adapt to different towing accessories, thereby realizing the connection with different RV chassis. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a three-dimensional structural diagram of the present invention after the tracks have been removed;

[0016] Figure 3 This is a top view of the structure of the present invention after removing the tracks and part of the side frame;

[0017] Figure 4 A three-dimensional structural diagram of the support shaft after assembly with the motor and bearing housing;

[0018] Figure 5 A schematic diagram of the three-dimensional structure supporting the shaft;

[0019] Figure 6 This is a three-dimensional structural diagram of the present invention after part of the vehicle body has been removed;

[0020] Figure 7 This is a three-dimensional structural diagram of the cooling fan and protective cover after they are fixed together. Detailed Implementation

[0021] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0022] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0023] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] See Figure 1-7As shown in the embodiment of this application, a tractor vehicle is disclosed, including a vehicle body 1, two traveling mechanisms, and two drive mechanisms. The two traveling mechanisms are respectively connected to the left and right sides of the vehicle body 1, and the two drive mechanisms are each connected to the inner side of the vehicle body 1. Each traveling mechanism is transmittedly connected to one of the drive mechanisms. Each traveling mechanism includes a side frame 2, a track 3, and two wheel sets 4 distributed at a front-to-back interval. The two side frames 2 are respectively fixed to the left and right sides of the vehicle body 1. The two wheel sets 4 in each traveling mechanism are rotatably connected to the corresponding side frame 2 at a front-to-back interval. The track 3 in each traveling mechanism is sleeved on the outside of the two wheel sets 4 in the corresponding traveling mechanism. Each drive mechanism includes a motor 5 and a transmission sprocket assembly 6. The motor 5 is fixed to the inner side of the vehicle body 1, and one of the traveling mechanisms is driven by one of the drive mechanisms. In one drive mechanism, the front wheel assembly 4 is connected to the output shaft of the corresponding motor 5 via the corresponding transmission sprocket assembly 6. In another drive mechanism, the rear wheel assembly 4 is connected to the output shaft of the corresponding motor 5 via the corresponding transmission sprocket assembly 6. Each drive mechanism also includes a support shaft 7, with both ends of each support shaft 7 rotatably connected to the corresponding side frame 2. The inner end of each side frame 2 is coaxially connected to the output shaft of the corresponding motor 5 and circumferentially limited. The structure in which the wheel assembly is connected to the output shaft of the motor via the transmission sprocket assembly is a current technology on the market. For example, the transmission structure of the wheel in an intelligent traction robot disclosed in Chinese Patent Publication No. CN117565985B, which uses a driven sprocket, transmission chain, and active sprocket to drive the motor, is not described in detail here.

[0026] Each support shaft 7 has a blind insertion hole 71 coaxially provided on its inner end, and a keyway 72 is provided on the side wall of each blind insertion hole 71. The output shaft of each motor 5 is coaxially inserted into the blind insertion hole 71 on the corresponding side of the support shaft 7 and is circumferentially limited by a limiting key and the keyway 72. With this structure, after the output shaft of the motor is coaxially inserted into the blind insertion hole on the corresponding side of the support shaft, the output shaft of the motor can abut against the inner end of the blind insertion hole to achieve axial limitation between the support shaft and the output shaft of the motor. After the keyway and the output shaft of the motor are connected by the limiting key, the support shaft can reliably achieve circumferential limitation with the output shaft of the motor.

[0027] Each support shaft 7 has a column 73 with an outer diameter smaller than that of the support shaft 7 coaxially arranged on its outer end. Each drive mechanism also includes a bearing seat 8, and each bearing seat 8 is fixed on the side frame 2 on the corresponding side. The column 73 on each support shaft 7 is rotatably connected to the bearing seat 8 on the corresponding side. With this structure, the outer end of the support shaft can be reliably rotatably connected to the bearing seat under the rotational cooperation of the column and the bearing seat. In addition, the outer end of the support shaft abuts against the bearing seat to achieve axial limiting of the support shaft.

[0028] Motor 5 is a brushless DC motor; by adopting a brushless DC motor, it has the advantages of high motor speed and large output torque, thereby improving the traction and load-bearing capacity of the tractor.

[0029] The tractor also includes a protective cover 9, which covers the outside of the two motors 5 and is fixed to the vehicle body 1. The protective cover can protect the motors to prevent them from being damaged by impact. For example, when the battery inside the vehicle body is being removed or installed, the battery can be prevented from hitting the motor to avoid damage to the motor.

[0030] The protective cover 9 has several heat dissipation holes 91 evenly distributed on it, and a cooling fan 10 is fixed on the side wall of the protective cover 9. With this structure, under the action of the cooling fan and the heat dissipation holes, the cooling fan can dissipate heat from the motor located inside the protective cover when it is working. That is, the cooling fan can actively drive the airflow: when the cooling fan is working, it can force the external cold air to be drawn into the body of the vehicle body from the gap between the track and the side frame until it enters the protective cover. The cold air entering the protective cover can flow over the surface of the motor and take away the heat generated by the motor during operation. Finally, the hot air is discharged through the heat dissipation holes on the protective cover. This forced convection cooling method greatly enhances the heat dissipation efficiency, significantly reduces the operating temperature of the motor, and thus improves the stability and reliability of the motor during operation.

[0031] See you again Figure 7 As shown, there are two cooling fans 10, and the two cooling fans 10 are respectively axially corresponding to one of the motors 5. With this structure, the cold air delivered by each cooling fan can flow through the motor along the axial direction of the motor at the corresponding position, and the cold air will wrap around the motor from the circumferential direction, which can greatly improve the heat dissipation efficiency and effect of the motor, significantly reduce the operating temperature of the motor, and thus improve the stability and reliability of the motor during operation.

[0032] Two handles 11 are fixed on the top of the vehicle body 1, which are spaced apart in front and behind. The handles can be used to lift the vehicle when it needs to be moved, thus making it easier to move the vehicle.

[0033] A connecting bracket 12 is also fixed on the top of the main body 1. Through the setting of the connecting bracket, the connecting bracket can be connected to the towing accessories on the RV to achieve towing of the RV. Of course, the connecting bracket can also adopt different types of brackets to adapt to different towing accessories, thereby achieving connection with different RV chassis.

[0034] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A tractor unit, comprising a vehicle body (1), two traveling mechanisms and two drive mechanisms; the two traveling mechanisms are respectively connected to the left and right sides of the vehicle body (1), and the two drive mechanisms are each connected to the inner side of the vehicle body (1), and the two traveling mechanisms are respectively connected to one of the drive mechanisms in a transmission connection; each traveling mechanism includes a side frame (2), a track (3) and two wheel sets (4) distributed in a front-to-back interval; the two side frames (2) are respectively fixed to the left and right sides of the vehicle body (1), and the two wheel sets (4) in each traveling mechanism are rotatably connected to the corresponding side frame (3) in a front-to-back interval. On the side frame (2), the track (3) of each of the walking mechanisms is sleeved on the outside of the two wheel sets (4) in the corresponding walking mechanism; each of the driving mechanisms includes a motor (5) and a transmission sprocket assembly (6); the motor (5) is fixed inside the body (1), and the wheel set (4) located on the front side of one of the walking mechanisms is connected to the output shaft of the motor (5) on the corresponding side through the transmission sprocket assembly (6) on the corresponding side, and the wheel set (4) located on the rear side of the other walking mechanism is connected to the output shaft of the motor (5) on the corresponding side through the transmission sprocket assembly (6) on the corresponding side; characterized in that: Each of the drive mechanisms also includes a support shaft (7), both ends of which are rotatably connected to the side frame (2) on the corresponding side, and the inner end of each side frame (2) is coaxially connected to the output shaft of the motor (5) on the corresponding side and circumferentially limited.

2. The tractor unit according to claim 1, characterized in that: Each of the support shafts (7) has a blind insertion hole (71) coaxially provided on its inner end. Each of the blind insertion holes (71) has a keyway (72) on its side wall. The output shaft of each motor (5) is coaxially inserted into the blind insertion hole (71) on the corresponding side of the support shaft (7) and is circumferentially limited by the limiting key and the keyway (72).

3. The tractor unit according to claim 1 or 2, characterized in that: Each of the support shafts (7) has a column (73) with an outer diameter smaller than that of the support shaft (7) coaxially arranged on its outer end. Each of the drive mechanisms also includes a bearing seat (8). Each bearing seat (8) is fixed on the side frame (2) on the corresponding side. The column (73) on each support shaft (7) is rotatably connected to the bearing seat (8) on the corresponding side.

4. The tractor unit according to claim 3, characterized in that: The motor (5) is a DC brushless motor.

5. The tractor unit according to claim 1, 2, or 4, characterized in that: The tractor also includes a protective cover (9), which covers the outside of the two motors (5) and is fixed to the vehicle body (1).

6. The tractor unit according to claim 5, characterized in that: The protective cover (9) has several heat dissipation holes (91) evenly distributed on it, and a cooling fan (10) is fixed on the side wall of the protective cover (9).

7. The tractor unit according to claim 6, characterized in that: There are two cooling fans (10), and the two cooling fans (10) are respectively axially corresponding to one of the motors (5).

8. The tractor unit according to claim 1, 2, 4, 6, or 7, characterized in that: The top of the vehicle body (1) is fixed with two handles (11) that are spaced apart in front and behind.

9. The tractor unit according to claim 1, 2, 4, 6, or 7, characterized in that: A connecting bracket (12) is also fixed to the top of the vehicle body (1).

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