CN205059726U - Electronic power assisted steering device of tricycle fork truck - Google Patents

Abstract

An electric power steering device for a three-wheeled forklift, including a steering wheel and an electronic control unit. The power steering device also includes a transmission shaft, a booster motor and a connecting rod mechanism. connection; the connecting shaft is covered with a spring, the connecting shaft seat is provided with a potentiometer for detecting the torque signal of the connecting shaft, the potentiometer is connected with the electronic control unit, and the electronic control unit is respectively connected with the The booster motor and the clutch are connected; the lower end of the transmission shaft is provided with a driving gear, and the middle section of the power output shaft is provided with a driven gear, and the driving gear meshes with the intermediate transmission gear, and the intermediate transmission gear and the secondary transmission gear The movable gear is meshed, and the lower end of the power output shaft is linked with the linkage mechanism, and the linkage mechanism is connected with the wheel. The utility model provides a relatively labor-saving and easy-to-maintain electric power steering device for a three-wheel forklift.

Description

An electric power steering device for a three-wheel forklift

technical field

The utility model belongs to the field of forklift equipment, in particular to an electric power steering device for a three-wheel forklift.

Background technique

In the traditional purely mechanical steering system, when turning, the wheels are turned completely by the torque applied by the driver on the steering wheel. When the speed of the vehicle is relatively low or the load is relatively large, the resistance to the steering wheel will be very large when turning, and the driver will feel abnormally strenuous to realize fast and accurate steering under such circumstances.

At present, the power steering system of forklifts generally adopts a hydraulic control system, which is not only difficult to process, unstable in performance, but also complex in layout, difficult to repair when faults occur, takes up a lot of space, is noisy, and often suffers from oil leakage. When the drive motor is directly above the wheel, the traditional steering mechanism cannot effectively realize the synchronous steering and connection of the steering wheel and the wheel.

Contents of the invention

In order to overcome the shortcomings of the existing vertical forklift power steering device which is relatively laborious and difficult to maintain, the utility model provides a relatively labor-saving and easy-to-maintain electric power steering device for a three-wheel forklift.

The technical scheme that the utility model solves its technical problem adopts is:

An electric power steering device for a three-wheel forklift, comprising a steering wheel and an electronic control unit, the steering wheel is connected to the upper end of a connecting shaft, the lower end of the connecting shaft is connected to the upper end of a power output shaft through a connecting shaft seat, the power steering device It also includes a transmission shaft, a booster motor and a link mechanism, the motor shaft of the booster motor is connected to the upper end of the transmission shaft through a clutch;

The connecting shaft is covered with a spring, and the connecting shaft seat is provided with a potentiometer for detecting the torque signal of the connecting shaft, and the potentiometer is connected with the electronic control unit, and the electronic control unit is respectively connected with the booster Motor, clutch connection;

The lower end of the transmission shaft is provided with a driving gear, and the middle section of the power output shaft is provided with a driven gear, and the driving gear meshes with the intermediate transmission gear, and the intermediate transmission gear meshes with the driven gear. The lower end of the output shaft is linked with the link mechanism, and the link mechanism is connected with the wheel.

Further, the linkage mechanism includes a slider, a first linkage, a second linkage and a pull rod, the upper end of the first linkage is hinged to the lower end of the power output shaft, and the lower end of the first linkage is hinged to the lower end of the power output shaft. The slider is hinged, the slider is installed on a horizontally arranged slide rail, the slider and the slide rail form a left and right movement pair, and the front end of the second connecting rod passes through a guide rod arranged in parallel with the slide rail Connected to the slider, the front end of the guide rod is fixedly connected to the rear end of the slider, the rear end of the guide rod is hinged to the front end of the second connecting rod, and the rear end of the second connecting rod The end is hinged with the front end of the pull rod, the rear end of the pull rod is connected with the wheel, and the pull rod is hinged with a fulcrum fixed on the vehicle frame to form a rotating pair.

Still further, the electronic control unit is a single-chip microcomputer.

The beneficial effects of the utility model are mainly manifested in: effectively solving the problem of bad steering feel of the traditional mechanical steering mechanism, and avoiding some defects of the hydraulic power steering device; The system cannot effectively realize the synchronous steering and connection of the steering wheel and wheels.

Description of drawings

Fig. 1 is a schematic structural view of an electric power steering device for a three-wheel forklift.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

Referring to FIG. 1 , an electric power steering device for a three-wheeled forklift includes a steering wheel 1 and an electronic control unit 2. The steering wheel 1 is connected to the upper end of the connecting shaft 3, and the lower end of the connecting shaft 3 is connected to the power output through the connecting shaft seat 4. The upper end of the shaft 5 is connected, and the power steering device also includes a transmission shaft 7, a booster motor 8 and a linkage mechanism, and the motor shaft 81 of the booster motor 8 is connected to the upper end of the transmission shaft 7 through a clutch 16;

The connecting shaft 3 is covered with a spring 17, and the connecting shaft seat 4 is provided with a potentiometer 18 for detecting the torque signal of the connecting shaft 3, the potentiometer 18 is connected with the electronic control unit 2, and the electronic The control unit 2 is respectively connected with the booster motor 8 and the clutch 16;

The lower end of the transmission shaft 7 is provided with a driving gear 11, and the middle section of the power output shaft 5 is provided with a driven gear 9, and the driving gear 11 is meshed with an intermediate transmission gear 10, and the intermediate transmission gear 10 is engaged with the driven gear 10. The movable gear 9 is meshed, and the lower end of the power output shaft 5 is linked with the linkage mechanism, and the linkage mechanism is connected with the wheel 15.

Further, the connecting rod mechanism includes a slider 20, a first connecting rod 12, a second connecting rod 13 and a pull rod 14, the upper end of the first connecting rod 12 is hinged to the lower end of the power output shaft 5, and the second The lower end of a connecting rod 12 is hinged with the slide block, and the slide block 20 is installed on the slide rail 21 arranged horizontally, and the slide block 20 and the slide rail 21 form a left and right moving pair, and the second connecting rod The front end of 13 is connected with the slider 20 through a guide rod arranged parallel to the slide rail 21, the front end of the guide rod is fixedly connected with the rear end of the slider 20, and the rear end of the guide rod is connected with the second slider. The front end of two connecting rods 13 is hinged, and the rear end of described second connecting rod 13 is hinged with the front end of described pull rod 14, and the rear end of described pull rod 14 is connected with wheel 15, and described pull rod 14 is fixed on the vehicle frame The fulcrums are hinged and form a revolving joint.

Still further, the electronic control unit 2 is a single-chip microcomputer.

In this embodiment, when the steering wheel 1 rotates, the potentiometer 18 detects the angle that the connecting shaft 3 has turned, and converts it into a torque signal; The upper part is fixed by a spring pressure plate; the lower section of the power output shaft 5 is arranged obliquely rearward, forming a certain corner with the middle section of the power output shaft 5, and the pull rod 14 is in the shape of an inverted "V". "The top of the font is rotatable on the articulated fulcrum, and the fulcrum is fixed on the frame; the intermediate transmission gear 10 is installed on the rotating shaft 6; the slide rail 21 is installed on the frame; the electronic control unit 2 is referred to as ECU, ECU According to the torque signal of the steering wheel 1, the optimal target reference voltage or current of the booster motor 8 is obtained, so as to drive the booster motor 8 to generate a certain booster torque.

The working process of the utility model is as follows: when the steering wheel 1 rotates, the spring 17 deforms and produces a certain deviation displacement, so the potentiometer 18 measures the torque signal of the steering wheel 1 and transmits it to the electronic control unit 2. The torque signal obtains the best target reference voltage or current of the booster motor 8 through a certain control strategy, so that the clutch 16 is closed, and the booster motor 8 is driven to rotate, and then the transmission shaft 7 is rotated through gear transmission, and the slider 20 is driven on the horizontal slide rail. 21 to move left and right, so that the pull rod 14 pulls the wheel 15 and turns to achieve the effect of power steering.

The utility model effectively solves the problem of poor steering feel of the traditional mechanical steering mechanism, avoids some defects of the hydraulic power steering device, and especially solves the problem that the traditional steering system cannot effectively realize the steering wheel and the wheel when the driving motor of the three-wheel forklift is directly above the wheel. Synchronous steering and connection problems.

Claims (3)

1. a three-wheel foklift truck electric power-assisted steering apparatus, comprise bearing circle and electronic control unit, described bearing circle is connected with the upper end of adapter shaft, the lower end of described adapter shaft is connected with the upper end of power take-off shaft by connection shaft seat, it is characterized in that: described servo steering device also comprises transmission shaft, assist motor and connecting rod mechanism, the motor shaft of described assist motor is connected by the upper end of power-transfer clutch with described transmission shaft;

Described adapter shaft is set with spring, and described connection shaft seat is provided with the potentiometer detecting adapter shaft dtc signal, and described potentiometer is connected with described electronic control unit, and described electronic control unit is connected with described assist motor, power-transfer clutch respectively;

The lower end of described transmission shaft is provided with driving gear, the stage casing of described power take-off shaft is provided with driven gear, described driving gear engages with intermediate drive gear, described intermediate drive gear engages with described driven gear, lower end and the described connecting rod mechanism of described power take-off shaft link, and described connecting rod mechanism is connected with wheel.

2. a kind of three-wheel foklift truck electric power-assisted steering apparatus as claimed in claim 1, it is characterized in that: described connecting rod mechanism comprises slide block, first connecting rod, second connecting rod and pull bar, the upper end of described first connecting rod and the lower end of described power take-off shaft hinged, lower end and the described slide block of described first connecting rod are hinged, described slide block is arranged on horizontally disposed slide rail, it is secondary that described slide block and described slide rail form sway, the front end of described second connecting rod is by being connected with described slide block with the pilot bar that slide rail is arranged in parallel, the front end of described pilot bar is fixedly connected with the rear end of described slide block, the rear end of described pilot bar and the front end of described second connecting rod hinged, the rear end of described second connecting rod and the front end of described pull bar hinged, the rear end of described pull bar is connected with wheel, described pull bar be fixed on point articulated on vehicle frame and form revolute pair.

3. a kind of three-wheel foklift truck electric power-assisted steering apparatus as claimed in claim 1 or 2, is characterized in that: described electronic control unit is micro controller system.