Steering system of electric steering forklift

Abstract

The utility model discloses a steering system of an electric steering forklift. The steering system comprises a steering axle, a transition shaft and an encoder. The steering axle comprises a steering motor, a reduction gearbox and an output supporting shaft. The upper portion of the output supporting shaft is located in a shell of the reduction gearbox and is a shaft section, the lower portion of the output supporting shaft is located below the shell of the reduction gearbox and is a supporting plate, and a first via hole in the lower end of the supporting plate is rotationally provided with a wheel shaft of a steering wheel. A mounting through hole is formed in the position, corresponding to the shaft section, of the upper side face of the shell of the reduction gearbox, the mounting through hole is covered with a mounting plate, and the mounting plate is detachably connected with the mounting through hole; the lower end of the transition shaft and the upper end of the shaft section are coaxial and detachably connected, the upper end of the transition shaft penetrates through a second via hole in the mounting plate and then is inserted into an input hole of the encoder and detachably connected, and a shell of the encoder is detachably connected with the mounting plate. The steering angle of the steering wheel is obtained by the encoder and fed back to the control system of the vehicle, and the accurate detection function of the steering angle is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of forklifts, and more specifically, to a steering system of an electric steering forklift. Background Art

[0002] The steering axle used in existing electric steering forklifts is only equipped with a potentiometer, which can realize the zero position calibration of the steering wheel, but cannot accurately detect and feedback the specific steering angle of the forklift's steering wheel. The steering wheel angle, a key operating state of the vehicle, is particularly important for vehicles with certain specific scenario requirements (such as unmanned vehicles). Utility Model Content

[0003] The present application provides a steering system for an electric steering forklift, in which the output support shaft of a steering axle is connected to the input hole of an encoder through a transition shaft, so that the input hole of the encoder rotates synchronously with the output support shaft, so that the encoder obtains the steering angle of the steering wheel and feeds it back to the control system of the vehicle, thereby realizing the precise detection function of the steering angle.

[0004] The present application provides a steering system for an electric steering forklift, including a steering axle, a transition shaft and an encoder;

[0005] The steering axle includes a steering motor, a reduction gearbox and an output support shaft; the upper part of the output support shaft is located in the housing of the reduction gearbox and is a shaft section, the lower part of the output support shaft is located below the housing of the reduction gearbox and is a support plate, and the axle of the steering wheel is rotatably arranged on the first through hole at the lower end of the support plate; a mounting through hole is arranged at a position corresponding to the shaft section on the upper side surface of the housing of the reduction gearbox, the mounting through hole is covered with a mounting plate, and the mounting plate is detachably connected to the mounting through hole;

[0006] The lower end of the transition shaft is coaxial with the upper end of the shaft section and is detachably connected. The upper end of the transition shaft passes through the second through hole on the mounting plate and is inserted into the input hole of the encoder and is detachably connected. The housing of the encoder is detachably connected to the mounting plate.

[0007] Preferably, the encoder is an absolute encoder.

[0008] Preferably, the steering system further comprises an angle calibration component.

[0009] Preferably, the angle calibration assembly includes a proximity switch and a trigger plate;

[0010] The body of the proximity switch is fixed on the mounting plate, and the detection head of the proximity switch faces the trigger plate;

[0011] The trigger plate is fixed on the transition shaft, and the rotation angle required for the trigger point on the trigger plate to rotate from the initial position to the detection head is the preset angle.

[0012] Preferably, the transition shaft comprises an annular protrusion in the middle and an upper protruding shaft and a lower protruding shaft respectively arranged at both ends of the annular protrusion, and the annular protrusion is attached to the upper end of the shaft section and is detachably connected by screws.

[0013] Preferably, the trigger plate is detachably connected to the upper end surface of the annular protrusion by means of screws.

[0014] Preferably, the trigger plate comprises a main body and a detection portion extending radially outward from the main body;

[0015] The main body is provided with a third through hole for the transition shaft to pass through.

[0016] Preferably, the detection portion is fan-shaped.

[0017] Preferably, the lower protruding shaft is inserted into the central hole of the shaft section.

[0018] Preferably, when the trigger plate is at the initial position, the edge of the detection portion closest to the detection head forms a detection point.

[0019] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0021] Figure 1 The overall structural diagram of the steering system of the electric steering forklift provided in this application;

[0022] Figure 2 A partial exploded view of the steering system of the electric steering forklift provided in the present application;

[0023] Figure 3 A partial cross-sectional view of the steering system of the electric steering forklift provided in the present application;

[0024] Figure 4 A schematic diagram of the structure of the trigger board provided in this application. DETAILED DESCRIPTION

[0025] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0026] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0027] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0028] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0029] The present application provides a steering system for an electric steering forklift, which connects the output support shaft of the steering bridge with the input hole of the encoder through a transition shaft, so that the input hole of the encoder rotates synchronously with the output support shaft, so that the encoder obtains the steering angle of the steering wheel and feeds it back to the control system of the vehicle, thereby realizing the precise detection function of the steering angle. In addition, the present application also calibrates the steering angle of the steering wheel through an angle calibration component, which helps to improve the effectiveness of the steering angle control of the unmanned forklift.

[0030] like Figure 1-3 As shown, the steering system of the electric steering forklift provided by the present application includes a steering axle, a transition shaft and an encoder.

[0031] The steering axle includes a steering motor 6, a reduction box 7 and an output support shaft 8. The upper part of the output support shaft 8 is located in the housing 71 of the reduction box 7 and is a shaft section 81, and the lower part of the output support shaft 8 is located below the housing 71 of the reduction box 7 and is a support plate 82. The first through hole at the lower end of the support plate 82 rotates the wheel axle 9 on which the steering wheel 10 is provided. The steering motor 6 plays a driving role. After its speed is reduced by the reduction box 7, it drives the output support shaft 8 to rotate, and the steering wheel 10 turns with the output support shaft 8 (rather than rotating with the wheel axle 9).

[0032] like Figure 2 and 3 As shown, a mounting through hole 72 is provided on the upper side surface of the housing 71 of the reduction box 7 at a position corresponding to the shaft section 81, and the mounting through hole 72 is covered with a mounting plate 3, and the mounting plate 3 is detachably connected to the mounting through hole 72 by screws.

[0033] The lower end of the transition shaft 1 is coaxial with the upper end of the shaft section 81 and is detachably connected. The upper end of the transition shaft 1 passes through the second through hole 31 on the mounting plate 3 and is inserted into the input hole 41 of the encoder 4 and is detachably connected. The housing 42 of the encoder 4 is detachably connected to the mounting plate 3.

[0034] As an embodiment, the encoder 4 is an absolute value encoder.

[0035] As an example, Figure 2 and 3As shown, the transition shaft 1 includes an annular protrusion 11 in the middle and an upper protruding shaft 12 and a lower protruding shaft 13 respectively arranged at both ends of the annular protrusion 11. The lower protruding shaft 13 is inserted into the central hole of the shaft segment 81 to achieve coaxiality. The annular protrusion 11 is attached to the upper end surface of the shaft segment 81 and is detachably connected by screws. The upper protruding shaft 12 is inserted into the input hole of the encoder 4 to achieve coaxiality, and the two are connected and fixed by a set screw.

[0036] Preferably, the steering system further comprises an angle calibration component.

[0037] As an example, Figure 2 and 3 As shown, the angle calibration assembly includes a proximity switch 5 and a trigger plate 2. The body of the proximity switch 5 is fixed on the upper surface of the mounting plate 3, and the detection head of the proximity switch 5 passes downward through the mounting plate 3 and faces the trigger plate 2 in the housing 71 of the reduction box 7, so as to sense the trigger plate 2. The trigger plate 2 is fixed on the transition shaft 1, and the rotation angle required for the trigger point on the trigger plate 2 to rotate from the initial position to the detection head of the proximity switch 5 is a preset angle, and the angle calibration assembly is used to calibrate the preset angle.

[0038] In the preferred embodiment of the above transition shaft 1 , the trigger plate 2 is detachably connected to the upper end surface of the annular protrusion 11 by means of screws.

[0039] As an example, Figure 2-4 As shown, the trigger plate 2 includes a main body 21 and a detection portion 22 extending radially outward from the main body 21. The main body 21 is provided with a third through hole 23 for the upper protruding shaft 12 to pass through. The main body 21 is symmetrically provided with a plurality of screw holes 24 relative to the third through hole 23, and the screws are fixedly connected to the annular protrusion 11 after passing through the screw holes 24.

[0040] Preferably, the detection portion 22 is fan-shaped. On this basis, when the trigger plate 2 is in the initial position, the edge of the detection portion 22 closest to the detection head forms a detection point. For example, if the output support shaft 8 rotates clockwise, the right edge of the detection portion 22 is first sensed by the detection head of the proximity switch 5, and the right edge is the detection point. If the output support shaft 8 rotates counterclockwise, the left edge of the detection portion 22 is first sensed by the detection head of the proximity switch 5, and the left edge is the detection point.

[0041] When the steering wheel 10 turns along with the output support shaft 8, the transition shaft 1 and the input hole of the encoder 4 rotate synchronously, whereby the encoder 4 collects the steering angle of the steering wheel 10 and feeds it back to the control system, thus realizing the steering angle detection function of the steering wheel.

[0042] When the steering wheel 10 turns with the output support shaft 8, the trigger plate 2 rotates synchronously with the output support shaft 8, and the relative position of the detection point of the trigger plate 2 and the proximity switch 5 changes. After the trigger plate 2 rotates a preset angle, the detection point just enters the detection range of the detection head of the proximity switch 5, so that the proximity switch 5 generates a detection signal, and the proximity switch 5 feeds the detection signal back to the system, thereby realizing the calibration of the steering angle.

[0043] The present application realizes high-precision collection and detection of the forklift steering angle and calibration of the steering angle of the steering wheel, which is beneficial to improving the accuracy of unmanned driving control of the vehicle.

[0044] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A steering system for an electric steering forklift, characterized in that: Including steering axle, transition shaft and encoder; The steering axle comprises a steering motor, a reduction gearbox and an output support shaft; the upper portion of the output support shaft is located in the housing of the reduction gearbox and is a shaft section, the lower portion of the output support shaft is located below the housing of the reduction gearbox and is a support plate, and the axle of the steering wheel is rotatably arranged on the first through hole at the lower end of the support plate; a mounting through hole is arranged at a position corresponding to the shaft section on the upper side surface of the housing of the reduction gearbox, the mounting through hole is covered with a mounting plate, and the mounting plate is detachably connected to the mounting through hole; The lower end of the transition shaft is coaxial with the upper end of the shaft section and is detachably connected. The upper end of the transition shaft passes through the second through hole on the mounting plate and is inserted into the input hole of the encoder and is detachably connected. The housing of the encoder is detachably connected to the mounting plate.

2. The steering system of the electric steering forklift according to claim 1, characterized in that: The encoder is an absolute value encoder.

3. The steering system of the electric steering forklift according to claim 1, characterized in that: The steering system also includes an angle calibration component.

4. The steering system of the electric steering forklift according to claim 3, characterized in that: The angle calibration assembly includes a proximity switch and a trigger plate; The body of the proximity switch is fixed on the mounting plate, and the detection head of the proximity switch faces the trigger plate; The trigger plate is fixed on the transition shaft, and the rotation angle required for the trigger point on the trigger plate to rotate from the initial position to the detection head is a preset angle.

5. The steering system of the electric steering forklift according to claim 4, characterized in that: The transition shaft comprises an annular protrusion in the middle and an upper protruding shaft and a lower protruding shaft respectively arranged at two ends of the annular protrusion. The annular protrusion is attached to the upper end of the shaft section and is detachably connected by screws.

6. The steering system of the electric steering forklift according to claim 5, characterized in that: The trigger plate is detachably connected to the upper end surface of the annular protrusion via screws.

7. The steering system of an electric steering forklift according to claim 6, characterized in that: The trigger plate includes a main body and a detection portion extending radially outward from the main body; The main body is provided with a third through hole for the transition shaft to pass through.

8. The steering system of the electric steering forklift according to claim 7, characterized in that: The detection portion is fan-shaped.

9. The steering system of an electric steering forklift according to claim 5, characterized in that: The lower protruding shaft is inserted into the central hole of the shaft segment.

10. The steering system of an electric steering forklift according to claim 8, characterized in that: When the trigger plate is at the initial position, the edge of the detection portion closest to the detection head forms a detection point.

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