1. The utility model provides a four-wheel steering chassis for electronic road sweeper, includes fuselage (1), sets up steering wheel (2), preceding bumper shock absorber (5) and back bumper shock absorber (11) at fuselage (1) front end portion, its characterized in that still includes:

the front wheel assembly is arranged at the front part of the machine body and comprises two front wheels (4), a front connecting plate (6) and a front wheel steering driving device, the front wheel assembly is arranged between the two front wheels and is fixed with the bottom of the machine body through a front shock absorber (5), the front wheel steering driving device comprises a front wheel steering pull rod (9) and a front wheel steering power component, the power output end of the front wheel steering power component is connected with one end of the front wheel steering pull rod, and the other end of the front wheel steering pull rod is connected with the front wheels to drive the front wheels to steer;

the rear wheel assembly of setting at fuselage rear portion, the rear wheel assembly includes two rear wheels (10), drive rear wheel pivoted driving motor (16), rear connecting plate (12) and rear wheel steering drive arrangement who is connected with 1 rear wheel respectively, the rear wheel assembly is fixed with the fuselage through rear shock absorber (11), rear wheel steering drive arrangement includes rear wheel steering pull rod (15) and rear wheel steering power part, the power take off end and the rear wheel steering pull rod one end of rear wheel steering power part are connected, the other end of rear wheel steering pull rod is connected the rear wheel and can be driven the rear wheel steering.

2. The four-wheel steering chassis for the electric road sweeper as claimed in claim 1, wherein an angle sensor (3) capable of sensing a steering angle and a steering direction of the steering wheel is disposed under a shaft of the steering wheel (2) and connected to a control single chip microcomputer, the single chip microcomputer is in communication connection with the front wheel steering driving device, the rear wheel steering driving device and the driving motor (16), and the single chip microcomputer controls the steering angle and the steering direction of the front wheel and the rear wheel according to the steering angle and the steering direction parameter information sensed by the angle sensor (3).

3. A four wheel steering chassis for an electric sweeper according to claim 2, wherein the front wheels are turned in the opposite direction to the rear wheels when steering.

4. The four-wheel steering chassis for an electric sweeper according to claim 1, wherein the front wheel steering linkage (9) comprises a long rod (91) and a short rod (92), the long rod being rotatably connected to one end of the short rod, the short rod being connected at its other end to the front wheel, the long rod being connected at its other end to the front wheel steering power unit.

5. The four-wheel steering chassis for an electric road sweeper of claim 4, wherein the front-wheel steering power unit includes a front-wheel steering reducer (7) having an output connected to the front-wheel steering linkage and a front-wheel steering motor (8) for driving the front-wheel steering reducer.

6. The four-wheel steering chassis for an electric road sweeper of claim 1, wherein the rear wheel steering linkage (15) comprises a straight rod (151) rotatably connected to one end of an arcuate rod, the other end of which is connected to the rear wheel, and an arcuate rod (152) the other end of which is connected to the rear wheel steering power member.

7. The four-wheel steering chassis for an electric road sweeper of claim 6, wherein the rear-wheel steering power unit includes a rear-wheel steering reducer (14) having an output connected to the rear-wheel steering linkage and a rear-wheel steering motor (13) for driving the rear-wheel steering reducer.

8. The four-wheel steering chassis for an electric sweeper according to claim 6, wherein the number of the driving motors (16) for driving the rear wheels to rotate is 2, and two rear wheels are driven respectively.

9. The four-wheel steering chassis for an electric sweeper according to claim 1, wherein the lower end of the front shock absorber (5) is connected to the front connection plate (6).

10. The four-wheel steering chassis for an electric sweeper according to claim 1, wherein a battery pack (17) is provided in the middle of the body (1).

Background

The small road sweeper for sweeping roads generally adopts two driving modes of fuel oil driving and electric driving, the fuel oil driving road sweeper drives a hydraulic pump through a fuel oil engine, and then the hydraulic pump provides power for a hydraulic motor and a hydraulic oil cylinder on equipment, and the driving mode has low energy efficiency conversion rate. The electric drive has two forms, namely an electric-to-hydraulic drive mode in which a hydraulic pump is driven by a battery and then the hydraulic pump provides power for a hydraulic motor and a hydraulic oil cylinder on equipment, and a power source is directly provided for a motor by the battery, the former electric-to-hydraulic drive mode has low energy efficiency conversion rate, and two sets of systems including electric and hydraulic systems have high failure rate; the latter pure electric mode has high energy efficiency conversion rate, can provide the most long-acting power guarantee for equipment, and especially, the pure electric equipment is more and more popular in the market along with the increasing strictness of national environmental protection policies and the inclination of new energy environmental sanitation equipment purchasing policies of governments in various regions.

However, the road sweeper adopting two electric driving modes generally adopts front wheel steering and rear wheel driving, has large turning radius of equipment, poor trafficability in narrow roads and operation places and limitation caused by the use of operation places, and has low efficiency conversion rate as a result of large energy consumption of a motor driving a hydraulic pump; and these electronic sweeping machine's steering mechanism still is traditional complicated mechanical structure, usually steering wheel and front wheel steering gear mechanical connection, need hard rotation steering wheel just can drive the front wheel and turn to when the rotation direction, because this kind of electronic chassis turns to heavy generally needs install the power assisted steering device additional on the steering wheel, but to the comparatively compact sweeping machine chassis of wheel load great simultaneously of space, install power assisted steering device additional and need increase the chassis area so that change the overall arrangement of whole sweeping machine chance, increase manufacturing cost.

Disclosure of Invention

The invention aims to solve the technical problem of providing a four-wheel steering chassis for an electric road sweeper, which is directly driven by a motor, driven by a rear wheel, can steer front and rear wheels and does not need a power assisting device.

The technical scheme adopted by the invention is as follows: the utility model provides a four-wheel steering chassis for electronic road sweeper, includes the fuselage, sets up steering wheel, preceding bumper shock absorber and the rear shock absorber in fuselage front end portion, still includes:

the front wheel assembly is arranged at the front part of the machine body and comprises two front wheels, a front connecting plate and a front wheel steering driving device, the front connecting plate is arranged between the two front wheels, the front wheel assembly is fixed with the bottom of the machine body through a front shock absorber, the front wheel steering driving device comprises a front wheel steering pull rod and a front wheel steering power part, the power output end of the front wheel steering power part is connected with one end of the front wheel steering pull rod, and the other end of the front wheel steering pull rod is connected with the front wheels to drive the front wheels to steer;

the rear wheel assembly of setting at fuselage rear portion, the rear wheel assembly includes two rear wheels, the driving motor who drives the rear wheel and rotate, back connecting plate and rear wheel steering drive device who is connected with 1 rear wheel respectively, the rear wheel assembly passes through the rear shock absorber and is fixed with the fuselage, rear wheel steering drive device includes rear wheel steering pull rod and rear wheel steering power part, the power take off end and the rear wheel of rear wheel steering power part turn to pull rod one end and be connected, the other end of rear wheel steering pull rod is connected the rear wheel and can be driven the rear wheel and turn to.

The invention discloses a four-wheel steering chassis for an electric road sweeper, which is preferably implemented by arranging an angle sensor capable of sensing the rotating angle and the rotating direction of a steering wheel below a shaft of the steering wheel and connecting the angle sensor with a control singlechip, wherein the singlechip is in communication connection with a front wheel steering driving device, a rear wheel steering driving device and a driving motor, and controls the rotating angle and the rotating direction of front wheels and rear wheels according to the parameter information of the rotating angle and the rotating direction of the steering wheel sensed by the angle sensor.

Further, the rotation direction of the front wheels is opposite to the rotation direction of the rear wheels during steering.

In a preferred embodiment of the four-wheel steering chassis for the electric road sweeper, the front wheel steering pull rod comprises a long rod and a short rod, the long rod is rotatably connected with one end of the short rod, the other end of the short rod is connected with the front wheel, and the other end of the long rod is connected with the front wheel steering power component.

Further, the front wheel steering power component comprises a front wheel steering speed reducer and a front wheel steering motor, wherein the output end of the front wheel steering speed reducer is connected with the front wheel steering pull rod, and the front wheel steering motor is used for driving the front wheel steering speed reducer.

In a preferred embodiment of the four-wheel steering chassis for the electric road sweeper, the rear wheel steering pull rod comprises a straight rod and an arc-shaped rod, the straight rod is rotatably connected with one end of the arc-shaped rod, the other end of the arc-shaped rod is connected with the rear wheel, and the other end of the straight rod is connected with the rear wheel steering power component.

Further, the rear wheel steering power component comprises a rear wheel steering speed reducer and a rear wheel steering motor, wherein the output end of the rear wheel steering speed reducer is connected with the rear wheel steering pull rod, and the rear wheel steering motor is used for driving the rear wheel steering speed reducer.

Still further, the number of driving motors driving the rear wheels to rotate is 2, and the driving motors respectively drive the two rear wheels.

In a preferred embodiment of the four-wheel steering chassis for an electric road sweeper of the present invention, the lower end of the front shock absorber is connected to the front connection plate.

In a preferred embodiment of the four-wheel steering chassis for an electric road sweeper of the present invention, a battery pack is provided at a middle portion of the body.

The invention has the beneficial effects that: the technical scheme of the invention is that the road sweeper adopts electric drive for walking and steering, a front wheel steering drive device for directly driving the front wheels to steer is arranged on a front wheel assembly, and a front wheel steering power component is matched with a front connecting plate and a front wheel steering pull rod which are arranged between two front wheels in a coordinated manner to drive the front wheels to steer. The rear wheel assembly is provided with a rear wheel steering driving device for directly driving the rear wheels to steer, and the rear wheel steering power component is matched with a rear wheel steering pull rod arranged between the two rear wheels in a mutually coordinated manner to drive the rear wheels to steer. The front wheel and the rear wheel can simultaneously steer, the turning radius is reduced, the steering power assisting device is not required to be additionally arranged, the whole volume and the occupied space of a steering system can be reduced, and the kinetic energy conversion efficiency can be improved.

The invention has the further beneficial effects that the steering wheel is in shaftless connection, the road sweeper is controlled to steer through the angle sensor and the control singlechip, the volume and the weight of the road sweeper can be further reduced, four-wheel steering can be realized, wherein two front wheels rotate leftwards while two rear wheels rotate rightwards, or two front wheels rotate rightwards while two rear wheels rotate leftwards, the steering is light and flexible, the turning radius is small, and the steering device can be suitable for various fields.

Drawings

FIG. 1 is a front view of a chassis taken along the direction of FIG. 2A-A according to an embodiment of the present invention;

FIG. 2 is a top view of a chassis according to one embodiment of the present invention;

FIG. 3 is a cross-sectional view of a chassis taken along the direction of FIG. 1B-B in accordance with an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a chassis taken along the direction of FIGS. 1C-C in accordance with an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a chassis taken along line D-D of FIG. 1 in accordance with an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a chassis taken along the direction of FIGS. 1E-E according to an embodiment of the present invention.

The reference numbers in the figures denote: 1-a fuselage; 2-a steering wheel; 3-an angle sensor; 4-front wheels; 5-a front shock absorber; 6-front connecting plate; 7-a front wheel steering reducer; 8-a front wheel steering motor; 9-front wheel steering tie rod; 10-a rear wheel; 11-rear shock absorber; 12-a rear connection plate; 13-a rear wheel steering motor; 14-rear wheel steering reducer; 15-rear wheel steering tie rod; 16-a drive motor; 17-a battery pack; 91-long rod; 92-short bar; 151-straight rod; 152-arc shaped rod.

Detailed Description

In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail below with reference to the following examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Referring to fig. 1 to 2, a four-wheel steering chassis for an electric road sweeper according to an embodiment of the present invention includes a body 1, which is generally of a frame structure, and has a front portion with a downward recess to meet a driver's requirement for a driving space. The back of the machine body is provided with a component which is convex towards the back and the upper part and is used for installing the working device. A battery pack 17 is provided in the middle of the body 1, and the battery pack 17 can be restrained between the front and rear wheels.

In this embodiment, the front wheel assembly is arranged at the front part of the body, the rear wheel assembly is arranged at the rear part of the body, the front wheel assembly comprises two front wheels 4, 2 front shock absorbers 5 are arranged at the front wheel assembly, the upper ends of the front shock absorbers 5 are fixedly connected with the bottom of the body, and the lower ends of the front shock absorbers 5 can be fixed with the front connecting plate 6. 2 rear shock absorbers 11 are arranged at the rear wheel assembly, the upper ends of the rear shock absorbers 11 are fixed with the bottom of the machine body, and the lower ends of the rear shock absorbers 11 can be fixedly connected with a rear connecting plate 12.

Referring to fig. 3-6, in this embodiment, a front connecting plate 6 is disposed between two front wheels, a front wheel steering driving device can be fixed on the front connecting plate 6, the front wheel steering driving device includes a front wheel steering rod 9 and a front wheel steering power component, the front wheel steering power component includes a front wheel steering reducer 7 and a front wheel steering motor 8, the front wheel steering rod 9 includes a long rod 91 and a short rod 92, the long rod is connected with one end of the short rod in a relatively rotatable manner, the other end of the long rod is connected with the front wheel steering reducer 7, the front wheel steering reducer 7 is driven by the front wheel steering motor 8, and the other end of the short rod is connected with the front wheel to drive the front wheel steering.

In this embodiment, the rear wheel assembly includes two rear wheels 10, and is driven by the rear wheels, or two driving motors 16 are respectively connected to the two rear wheels to directly drive the rear wheels to rotate.

In this embodiment, each rear wheel department sets up 1 rear connecting plate 12 respectively, fixes rear wheel steering drive on rear connecting plate 12, and rear wheel steering drive includes rear wheel steering pull rod 15 and rear wheel steering power part, and rear wheel steering power part includes rear wheel steering speed reducer 14 and rear wheel steering motor 13, rear wheel steering pull rod 15 includes straight-bar 151 and arc 152, and the straight-bar is connected with the one end rotatable coupling of arc, and the rear wheel is connected to the other end of arc, and the power output shaft of rear wheel steering speed reducer 14 is connected to the other end of straight-bar, and rear wheel steering speed reducer 14 connects the rear wheel steering motor 13 who is used for driving rear wheel steering speed reducer, and the arc other end of rear wheel steering pull rod is connected the rear wheel and can drive the rear wheel steering.

In this embodiment, the front wheels and the rear wheels can both rotate in the left and right directions during steering, and the turning radius can be reduced.

In this embodiment, set up steering wheel 2 at the front end of fuselage 1, set up angle sensor 3 that can respond to steering wheel turned angle and rotation direction below the axle of steering wheel 2, the control singlechip is used for controlling front and back wheel and turns to and move, the control singlechip is according to steering wheel turned angle and steering wheel turned direction parameter information control front wheel and the turned angle and the rotation direction of rear wheel behind the angle sensor 3 response, the singlechip is connected with front wheel steering drive and rear wheel steering drive communication and is controlled front wheel and rear wheel and is rotated, the singlechip still is connected with the driving motor 16 communication of rear wheel and is controlled the rear wheel motion.

In the embodiment, when the steering wheel rotates leftwards by a certain angle, the angle sensor 3 inputs electric signal information sensing the rotating direction and the rotating angle into the single chip microcomputer, the single chip microcomputer sends a starting command to the front wheel steering motor 8 in a communication mode, the front wheel steering drag link 9 is pushed to move through the front wheel steering speed reducer 7 and drives the two front wheels to rotate leftwards at the same time, the single chip microcomputer sends a starting command to the rear wheel steering motor 13, the rear wheel steering drag link 15 is pushed to move through the rear wheel steering speed reducer 14 and drives the two rear wheels to rotate rightwards, and the rotating direction of the front wheels is opposite to the rotating direction of the rear wheels to realize four-wheel steering; similarly, when the steering wheel rotates rightwards, the two front wheels rotate rightwards simultaneously, and the two rear wheels rotate leftwards simultaneously, so that four-wheel steering is realized.

In the embodiment, the steering wheel is not directly connected with the steering mechanism of the wheels, and a signal transmission mode is adopted, so that the steering wheel is lighter and lighter during rotation, and a power assisting device does not need to be additionally arranged. Two driving motors are arranged on the rear wheels to drive the whole machine, the two rear wheels are arranged behind the machine body, each rear wheel is directly connected with one driving motor, a driver can send a starting or stopping command to the single chip microcomputer through the starting device, and the single chip microcomputer sends the starting or stopping command to the driving motors to control the front and back movement or stopping of the rear wheels.

The technical scheme of the embodiment is a direct drive mode of a rear wheel motor of a pure electric drive chassis, and the energy efficiency conversion rate is high. The front wheel and the rear wheel can simultaneously turn, the turning radius is reduced, and meanwhile, the steering wheel is in shaftless connection, so that the rotation is light and flexible.

The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.