Steering transmission mechanism of motor sweeper

Abstract

The utility model belongs to the technical field of motor sweepers, and discloses a motor sweeper steering transmission mechanism which comprises an electric control reverser, a transmission assembly and a steering wheel assembly, and an output shaft is arranged on the side wall of the electric control reverser. The transmission assembly comprises a steering plumbing arm, a straight pull rod and a steering knuckle arm, the two ends of the steering plumbing arm are connected with the output shaft and the straight pull rod respectively, and the steering knuckle arm is arc-shaped and one end of the steering knuckle arm is connected with the straight pull rod. The steering wheel assembly comprises a hub and a rotatable wheel support, the wheel support is connected with the hub, and the other end of the steering knuckle arm is connected with the wheel support. The electric control reverser is provided with a frame connecting frame, and the frame connecting frame protrudes out of the side, away from the output shaft, of the electric control reverser and is connected with the chassis frame. By arranging the vehicle frame connecting frame, the electric control commutator can be mounted on the chassis frame on the premise that transmission of the steering plumbing arm is not affected, and the integration level of the sweeper is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of cleaning vehicle, especially a cleaning vehicle steering transmission mechanism. BACKGROUND

[0002] With the development of unmanned technology, in addition to the traditional freight vehicle type, the cleaning vehicle for cleaning the city can also use unmanned technology to realize the automatic driving mode. However, the self-driving mode cleaning vehicle is difficult to turn in time for cleaning operation under part of the complex road conditions, and still needs to reserve the manual steering structure for manual operation. Under the premise of reserving the manual steering structure, the installation space reserved for the electric control reverser near the driving position will be greatly compressed. If the traditional support installation method is adopted, the required installation space is large and difficult, which is difficult to adapt to the development direction of the cleaning vehicle miniaturization, modularization and integration. SUMMARY

[0003] The utility model discloses a cleaning vehicle steering transmission mechanism, can directly fix electric control reverser on chassis frame, save special connecting support structure, convenient to install and the required installation space is smaller, effectively improve the integration of cleaning vehicle.

[0004] To achieve this purpose, the utility model adopts the following technical scheme: a cleaning vehicle steering transmission mechanism, the cleaning vehicle is equipped with chassis frame, the cleaning vehicle steering transmission mechanism includes electric control reverser, transmission assembly and steering wheel assembly, the side wall of electric control reverser is equipped with output shaft;Transmission assembly includes steering vertical arm, straight pull rod and steering knuckle arm, both ends of steering vertical arm are connected with output shaft and straight pull rod respectively, steering knuckle arm is arc-shaped and one end is connected with straight pull rod;Steering wheel assembly includes wheel hub and rotatable wheel support, wheel support is connected with wheel hub, the other end of steering knuckle arm is connected with wheel support;Wherein, electric control reverser is equipped with frame connecting frame, frame connecting frame protrudes from the side of electric control reverser away from output shaft and is connected with chassis frame.

[0005] As a preferred, the reinforcing part is filled between the frame connecting frame and the outer wall of the electric control reverser, and the reinforcing part and the frame connecting frame are integrally formed.

[0006] As a preferred, the side of the electric control reverser away from the output shaft is connected with an end cover, and the frame connecting frame is arranged around part of the end cover.

[0007] Preferably, the straight pull rod comprises a first straight pipe section, an inclined pipe section and a second straight pipe section, the first straight pipe section is arranged along the running direction of the steering wheel assembly, the second straight pipe section is arranged in parallel with the first straight pipe section, the inclined pipe section is arranged at an angle with the first straight pipe section, and two ends of the inclined pipe section are connected with the first straight pipe section and the second straight pipe section respectively.

[0008] Preferably, the angle between the inclined pipe section and the first straight pipe section is 165°.

[0009] Preferably, the two ends of the straight pull rod are respectively provided with ball grooves, the steering drop arm and the steering knuckle arm are both connected with ball pins, and the ball pins are correspondingly limited in the ball grooves.

[0010] Preferably, the bottom end of the steering drop arm is inclined towards the steering wheel assembly.

[0011] Preferably, the sweeping vehicle steering transmission mechanism further comprises a linkage assembly, the linkage assembly comprises a cross beam, two trapezoidal steering arms and a horizontal pull rod, the cross beam and the horizontal pull rod are both arranged perpendicular to the running direction of the steering wheel assembly, two wheel supports are arranged, the two wheel supports are symmetrically arranged at the two ends of the cross beam and are both rotationally connected with the cross beam, the trapezoidal steering arms are arranged along the running direction of the steering wheel assembly and are connected with the wheel supports correspondingly, and two ends of the horizontal pull rod are connected with the two trapezoidal steering arms respectively.

[0012] Preferably, the sweeping vehicle steering transmission mechanism further comprises a steering wheel, the top end of the electric control reverser is provided with an input shaft, and the input shaft is in transmission connection with the steering wheel through a steering column.

[0013] Preferably, the electric control reverser is provided with a driving motor, the tail end of the driving motor is provided with a controller, the controller is in electrical connection with the driving motor, a torque angle sensor is arranged in the electric control reverser, the torque angle sensor is arranged around the input shaft and is in electrical connection with the controller through a connecting pipeline.

[0014] The sweeping vehicle steering transmission mechanism has the advantages that: the electric control reverser is arranged, the electric control reverser drives the output shaft to rotate, the straight pull rod is pulled and the wheel support is driven to rotate through the steering knuckle arm, the automatic steering of the sweeping vehicle is realized, and the electric control reverser can provide power assistance when the operator manually controls the steering. The frame connecting frame is arranged on the side, away from the output shaft, of the electric control reverser, the electric control reverser is mounted on the chassis frame without affecting the transmission of the steering drop arm and reserving the manual steering structure, the traditional special connecting support structure is saved, the installation structure of the sweeping vehicle steering transmission mechanism is simplified, the installation convenience is improved and the required installation space is reduced, and the integration of the sweeping vehicle is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structure schematic view of the steering transmission mechanism of the cleaning vehicle according to an embodiment of the present utility model;

[0016] Figure 2 is a structure schematic view of the electrically controlled commutator according to an embodiment of the present utility model;

[0017] Figure 3 is a structure schematic view of the straight pull rod according to an embodiment of the present utility model;

[0018] Figure 4 is Figure 1 is an enlarged view of A in figure;

[0019] Figure 5 is a structure schematic view of the steering wheel assembly according to an embodiment of the present utility model.

[0020] In the figure:

[0021] 100, electrically controlled commutator; 110, output shaft; 120, shell; 121, vehicle frame connecting frame; 1211, mounting hole; 122, reinforcing part; 130, end cover; 140, driving motor; 141, controller; 142, connecting pipeline; 150, input shaft; 160, stud;

[0022] 200, transmission assembly; 210, steering drop arm; 211, ball pin; 220, straight pull rod; 221, first straight pipe section; 222, inclined pipe section; 223, second straight pipe section; 224, ball groove; 230, steering knuckle arm;

[0023] 300, steering wheel assembly; 310, wheel hub; 320, wheel support;

[0024] 400, linkage assembly; 410, cross beam; 420, trapezoidal steering arm; 430, cross pull rod. DETAILED DESCRIPTION

[0025] The present utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, and not to limit the present utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present utility model are shown in the drawings, not all the structures.

[0026] In the description of the utility model, unless another definite provision and limitation, the term "connect", "connection", "fixed" should be broad sense understanding, for example, can be fixed connection, can also be detachable connection, or integrated;Can be mechanical connection, can also be electrical connection;Can be directly connected, can also be indirectly connected through the intermediate medium, can be two elements inside the communication or the interaction relationship of two elements.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0027] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, can also include the first and second features are not direct contact but contact through the additional features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0028] In the description of the embodiment, the terms "up", "down", "right", etc. Orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0029] Referring to Figures 1 to 5 As shown in the figure, according to the cleaning vehicle steering transmission mechanism provided by the embodiment of the application, the cleaning vehicle is provided with a chassis frame. Optionally, the chassis frame is a frame structure formed by welding high-strength structural steel or aluminum alloy and the like. The cleaning vehicle steering transmission mechanism comprises: an electric control commutator 100, a transmission assembly 200 and a steering wheel assembly 300, and the side wall of the electric control commutator 100 is provided with an output shaft 110 protruding from the surface of the commutator. In the embodiment, the electric control commutator 100 selects the X-EPS electric control circulating ball steering commutator with high precision and large assist, and this is particularly stated to avoid misunderstanding.

[0030] The transmission assembly 200 comprises a steering drop arm 210, a straight pull rod 220 and a steering knuckle arm 230, both ends of the steering drop arm 210 are connected with the output shaft 110 and the straight pull rod 220 respectively. Optionally, the steering drop arm 210 is connected with the output shaft 110 by a spline and is limited by a limiting nut. The steering knuckle arm 230 is arc-shaped and one end thereof is connected with the straight pull rod 220; the steering wheel assembly 300 comprises a wheel hub 310 for supporting a mounted wheel and a rotatable wheel support 320 connected with the wheel hub 310, and the other end of the steering knuckle arm 230 is connected with the wheel support 320; wherein the electric control commutator 100 is provided with a frame connecting bracket 121 protruding from the side of the electric control commutator 100 away from the output shaft 110 and connected with the chassis frame. Specifically, the frame connecting bracket 121 is a bent strip-shaped metal structure, both ends of the frame connecting bracket 121 extend obliquely from the side of the electric control commutator 100 away from the output shaft 110 to the rear side of the electric control commutator 100 and are welded and fixed or integrally formed with the electric control commutator 100. Optionally, the frame connecting bracket 121 can be welded and fixed with the chassis frame, or can be detachably connected with the chassis frame through fasteners, clamping structures or mortise and tenon structures, etc. In this embodiment, a plurality of mounting holes 1211 are arranged on the frame connecting bracket 121, and the frame connecting bracket 121 is fixed to the chassis frame through the mounting holes 1211 and fasteners, which will not be described herein.

[0031] It can be understood that by arranging the electric control commutator 100, the electric control commutator 100 drives the output shaft 110 to rotate, thereby pulling the straight pull rod 220 and driving the wheel support 320 to rotate through the steering knuckle arm 230, so as to realize automatic steering of the sweeper. The electric control commutator 100 can also provide assistance when the operator manually controls the steering.

[0032] By arranging the frame connecting bracket 121, the frame connecting bracket 121 is arranged on the side of the electric control commutator 100 away from the output shaft 110, so that the electric control commutator 100 can be mounted on the chassis frame without affecting the transmission of the steering drop arm 210 and reserving the manual steering structure, thereby eliminating the need for a specially designed connecting bracket structure, simplifying the mounting structure of the steering transmission mechanism of the sweeper, improving the installation convenience and reducing the required installation space, and effectively improving the integration of the sweeper.

[0033] It should be noted that in some embodiments, the side of the electric control commutator 100 away from the output shaft 110 is also provided with a protruding stud 160, and a threaded hole is arranged in the center of the stud 160. The user can further strengthen the connection between the chassis frame and the electric control commutator 100 through the fasteners and the stud 160.

[0034] Furthermore, the bottom end of the steering arm 210 is inclined in the direction close to the steering wheel assembly 300; in other words, the bottom end of the steering arm 210 is inclined backward in the direction of travel of the steering wheel assembly 300.

[0035] When the output shaft 110 rotates forward or backward, it can pull the straight rod 220 forward or backward via the steering arm 210, thereby causing the wheel hub 310 to turn left or right. Since the steering arm 210 and the straight rod 220 are located on one side of the electronic commutator 100, the distances from the steering arm 210 and the straight rod 220 to the wheel hubs 310 on both sides of the sweeper are unequal. If the steering arm 210 is arranged vertically, that is, perpendicular to the horizontal plane, the amplification effect of the transmission from the steering arm 210 and the straight rod 220 to the wheel hubs 310 on the left and right sides of the sweeper is unequal. There is an angle difference in the maximum angle of the wheel hub 310 turning left or right. For example, if the steering arm 210 and the straight rod 220 are located on the left side of the electronic commutator 100, the amplification effect of the transmission from the steering arm 210 to the left wheel hub 310 is smaller, so the maximum angle of the wheel hub 310 turning left is smaller than the maximum angle of the wheel hub 310 turning right.

[0036] By tilting the steering arm 210, the maximum angle difference between the left and right turns of the wheel hub 310 can be eliminated, ensuring the synchronization of the steering angles of the wheel hubs 310 on both sides of the sweeper.

[0037] It should be noted that the tilt angle of the steering arm 210, that is, the angle between the center line of the steering arm 210 and the perpendicular line passing through the center of the output shaft 110, can be customized according to parameters such as the length of the steering arm 210, the length of the tie rod 220, and the external dimensions of the steering knuckle arm 230, which will not be elaborated here.

[0038] Reference Figure 1 and Figure 2 As shown, it can be understood that the side of the electronically controlled commutator 100 opposite to the output shaft 110 is connected to an end cover 130, and the frame connecting bracket 121 is arranged around a portion of the end cover 130. Specifically, the electronically controlled commutator 100 includes a housing 120 and a transmission component disposed within the housing 120. The transmission component includes a screw, a nut, a sector gear, and an output shaft 110. The nut is sleeved on the screw, and multiple balls are filled between the nut and the screw. The sector gear and the outer wall of the nut are threadedly engaged. The output shaft 110 is fixedly connected to the sector gear and can rotate with the sector gear. One end of the output shaft 110 extends out of the housing 120. The housing 120 has an opening for mounting the output shaft 110. The end cover 130 is detachably connected to the housing 120 to close the opening.

[0039] The frame connecting frame 121 is arranged around part of the end cover 130, and the frame connecting frame 121 protrudes from the side wall of the electrically controlled commutator 100, which can avoid affecting the installation of the output shaft 110 or the end cover 130, and improve the structural rationality of the frame connecting frame 121.

[0040] Further, the frame connecting frame 121 and the outer wall of the electrically controlled commutator 100 are filled with a reinforcing part 122, and the reinforcing part 122 and the frame connecting frame 121 are integrally formed. The reinforcing part 122 extends from the rear side of the shell 120 of the electrically controlled commutator 100 to the side wall of the frame connecting frame 121, thereby filling the curved surface structure of the hollow part between the frame connecting frame 121 and the shell 120.

[0041] By arranging the reinforcing part 122, the reinforcing part 122 can support and constrain the frame connecting frame 121 from all directions, avoid deformation of the frame connecting frame 121, effectively improve the structural strength of the frame connecting frame 121, and prolong the service life of the frame connecting frame 121.

[0042] It can be understood that the cleaning vehicle steering transmission mechanism further includes a steering wheel, and the top end of the electrically controlled commutator 100 is provided with an input shaft 150, the input shaft 150 is fixedly connected with a screw rod in the shell 120, and the input shaft 150 is in transmission connection with the steering wheel through a steering column.

[0043] Connecting the steering wheel with the input shaft 150, when the electrically controlled commutator 100 controls the automatic steering of the cleaning vehicle, if the electrically controlled commutator 100 fails, manual control can be taken over at any time, and manual quick steering is increased, so as to increase steering safety redundancy and improve the controllability of the cleaning vehicle.

[0044] In some embodiments, a double universal joint is further connected between the steering column and the input shaft 150. By arranging the double universal joint, the inclination installation of the steering wheel can be realized, and the steering convenience of the steering wheel is improved on the premise of ensuring stable torque transmission.

[0045] Referring to Figure 2 It can be understood that the electrically controlled commutator 100 is provided with a driving motor 140, the driving motor 140 is integrated on one side of the shell 120 and is in transmission connection with the screw rod, the tail end of the driving motor 140 is provided with a controller 141, the controller 141 is in electrical connection with the driving motor 140, a torque angle sensor is arranged in the electrically controlled commutator 100 and is in electrical connection with the controller 141 through a connecting pipeline 142.

[0046] By setting the torque angle sensor, the torque angle sensor can detect the torque and angle of the input shaft 150 in real time, and send the detected torque signal and angle signal to the controller 141 in real time, which facilitates the controller 141 to accurately control the output torque of the electrically controlled reversing clutch 100, and effectively improves the control accuracy and automation degree of the electrically controlled reversing clutch 100.

[0047] With reference to Figure 3 As shown in FIG. 2, it can be understood that the straight pull rod 220 comprises a first straight pipe section 221, an inclined pipe section 222 and a second straight pipe section 223, the first straight pipe section 221 is arranged along the running direction of the steering wheel assembly 300, and the first straight pipe section 221, the inclined pipe section 222 and the second straight pipe section 223 are arranged in sequence along the running direction of the steering wheel assembly 300, the second straight pipe section 223 is arranged in parallel with the first straight pipe section 221, the inclined pipe section 222 is arranged at an angle with the first straight pipe section 221, both ends of the inclined pipe section 222 are connected with the first straight pipe section 221 and the second straight pipe section 223 respectively, one end of the first straight pipe section 221 away from the inclined pipe section 222 is connected with the steering drop arm 210, and one end of the second straight pipe section 223 away from the inclined pipe section 222 is connected with the steering knuckle arm 230.

[0048] By setting the inclined pipe section 222, the first straight pipe section 221 and the second straight pipe section 223 are staggered in the direction perpendicular to the running direction of the hub 310 (i.e. in the width direction of the chassis frame), so that the second straight pipe section 223 close to the hub 310 is away from the center of the chassis frame, avoiding collision of the straight pull rod 220 with the chassis frame during movement, and effectively improving the structural stability of the transmission assembly 200.

[0049] Further, the angle between the inclined pipe section 222 and the first straight pipe section 221 is 165°.

[0050] The angle between the inclined pipe section 222 and the first straight pipe section 221 is set to 165°, on the one hand, it can avoid that the angle is too large, the first straight pipe section 221 and the second straight pipe section 223 are too close in the width direction of the chassis frame, and the avoiding effect is not obvious, and the straight pull rod 220 is easy to scratch the chassis frame; on the other hand, it can avoid that the angle is too small, the connection between the first straight pipe section 221 and the inclined pipe section 222 and the connection between the second straight pipe section 223 and the inclined pipe section 222 are stress concentrated, which affects the transmission efficiency and service life of the straight pull rod 220.

[0051] It should be noted that the connections between the first straight pipe section 221 and the inclined pipe section 222 and between the second straight pipe section 223 and the inclined pipe section 222 are all rounded, so as to optimize the stress structure of the straight pull rod 220, further reduce stress concentration and prolong the service life of the straight pull rod 220.

[0052] With reference to Figure 4As shown, it can be understood that the two ends of the straight pull rod 220 are respectively provided with ball grooves 224, and the steering vertical arm 210 and the steering knuckle arm 230 are both connected with ball pins 211, and the ball pins 211 are correspondingly limited in the ball grooves 224.

[0053] By setting the ball grooves 224 and the ball pins 211, the straight pull rod 220 and the steering vertical arm 210 and the straight pull rod 220 and the steering knuckle arm 230 are changed from the traditional rotary connection to the ball connection, the flexibility of the straight pull rod 220 is increased, the fluency of the hub 310 when steering is improved, and the ball grooves 224 and the ball pins 211 can absorb the assembly error of the straight pull rod 220 during installation, and the vibration of the hub 310 conducted to the straight pull rod 220 when the sweeper travels on a bumpy road, effectively improving the installation stability of the straight pull rod 220.

[0054] Referring to Figure 5 As shown, it can be understood that the sweeper steering transmission mechanism further comprises a linkage assembly 400, the linkage assembly 400 comprises a cross beam 410, two trapezoidal steering arms 420 and a cross pull rod 430, the cross beam 410 is fixed to the chassis frame, the cross beam 410 and the cross pull rod 430 are both arranged perpendicular to the running direction of the steering wheel assembly 300, two wheel supports 320 are provided, the two wheel supports 320 are symmetrically arranged at the two ends of the cross beam 410 and are both rotationally connected with the cross beam 410, the steering knuckle arm 230 is fixedly connected with one of the wheel supports 320, the trapezoidal steering arm 420 is arranged along the running direction of the steering wheel assembly 300 and is correspondingly connected with the wheel support 320, and the two ends of the cross pull rod 430 are respectively connected with the two trapezoidal steering arms 420, at this time, the projection of the linkage assembly 400 on the horizontal plane is a parallelogram.

[0055] In the embodiment, the ball pin and the ball groove connection is also adopted between the cross pull rod 430 and the trapezoidal steering arm 420, and the specific connection structure and effect can be referred to the description of the ball pin 211 and the ball groove 224 in the foregoing, which will not be described here.

[0056] By setting the linkage of the trapezoidal steering arm 420 and the cross pull rod 430 on both sides of the wheel support 320, the trapezoidal structure of the trapezoidal steering arm 420 can maintain the stability of the parallelogram steering linkage structure while transmitting the steering force, and reduce the possible shaking or instability phenomenon of the wheel support 320 during rotation.

[0057] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A steering transmission mechanism for a sweeper vehicle, wherein the sweeper vehicle is equipped with a chassis frame, characterized in that, The sweeper's steering transmission mechanism includes: An electronically controlled commutator (100) has an output shaft (110) on its side wall. The transmission assembly (200) includes a steering drop arm (210), a tie rod (220) and a steering knuckle arm (230). The two ends of the steering drop arm (210) are connected to the output shaft (110) and the tie rod (220) respectively. The steering knuckle arm (230) is arc-shaped and one end is connected to the tie rod (220). A steering wheel assembly (300) includes a hub (310) and a rotatable wheel bracket (320) connected to the hub (310), and the other end of the steering knuckle arm (230) is connected to the wheel bracket (320). The electronically controlled commutator (100) is provided with a frame connecting frame (121), which protrudes from the side of the electronically controlled commutator (100) away from the output shaft (110) and is connected to the chassis frame. The sweeper steering transmission mechanism also includes a steering wheel. The top of the electronically controlled commutator (100) is provided with an input shaft (150), which is connected to the steering wheel via a steering column. The electronically controlled commutator (100) is provided with a drive motor (140), and the tail end of the drive motor (140) is provided with a controller (141). The controller (141) is electrically connected to the drive motor (140). The electronically controlled commutator (100) is provided with a torque angle sensor, which is arranged around the input shaft (150) and electrically connected to the controller (141) via a connecting line (142).

2. The sweeper steering transmission mechanism according to claim 1, characterized in that, A reinforcing part (122) is filled between the outer wall of the frame connecting frame (121) and the electronically controlled commutator (100), and the reinforcing part (122) and the frame connecting frame (121) are integrally formed parts.

3. The sweeper steering transmission mechanism according to claim 1, characterized in that, The electronically controlled commutator (100) is connected to an end cap (130) on the side opposite to the output shaft (110), and the frame connecting bracket (121) is arranged around a portion of the end cap (130).

4. The sweeper steering transmission mechanism according to any one of claims 1-3, characterized in that, The straight tie rod (220) includes a first straight pipe section (221), an inclined pipe section (222), and a second straight pipe section (223). The first straight pipe section (221) is arranged along the travel direction of the steering wheel assembly (300). The second straight pipe section (223) is arranged parallel to the first straight pipe section (221). The inclined pipe section (222) is arranged at an angle to the first straight pipe section (221). The two ends of the inclined pipe section (222) are connected to the first straight pipe section (221) and the second straight pipe section (223), respectively.

5. The sweeper steering transmission mechanism according to claim 4, characterized in that, The angle between the inclined pipe section (222) and the first straight pipe section (221) is 165°.

6. The sweeper steering transmission mechanism according to any one of claims 1-3, characterized in that, The straight tie rod (220) has ball grooves (224) at both ends, and the steering drop arm (210) and the steering knuckle arm (230) are both connected to ball pins (211), with the ball pins (211) correspondingly limited to the ball grooves (224).

7. The sweeper steering transmission mechanism according to any one of claims 1-3, characterized in that, The bottom end of the steering arm (210) is inclined in the direction close to the steering wheel assembly (300).

8. The sweeper steering transmission mechanism according to any one of claims 1-3, characterized in that, The sweeper steering transmission mechanism also includes a linkage assembly (400), which includes a crossbeam (410), two trapezoidal steering arms (420) and a tie rod (430). The crossbeam (410) and the tie rod (430) are arranged perpendicular to the travel direction of the steering wheel assembly (300). There are two wheel brackets (320), which are symmetrically arranged at both ends of the crossbeam (410) and rotatably connected to the crossbeam (410). The trapezoidal steering arms (420) are arranged along the travel direction of the steering wheel assembly (300) and are correspondingly connected to the wheel brackets (320). The two ends of the tie rod (430) are respectively connected to the two trapezoidal steering arms (420).

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