A steering wheel assembly for an electric fork lift truck

Abstract

The present application relates to steering wheel assembly technical field, disclose a kind of electric fork truck's steering wheel assembly, it includes: steering wheel body, the steering wheel body has installation slot, the bottom of the installation slot is equipped with positioning column and anti-rotation groove, the positioning column has the guide hole through along axial direction;Instruction button, the instruction button is set in the installation slot with lifting, and with the guide column of slidable insertion into the guide hole, and the anti-rotation block of slidable insertion in the anti-rotation groove, the anti-rotation block with the anti-rotation groove in the section shape same perpendicular to the instruction button lifting direction, and the section shape is non-circular;Reset spring, the reset spring is sleeved on the positioning column, one end is in contact with the bottom wall of the installation slot, the other end is in contact with the inner wall of the instruction button.This application has the beneficial effect that operation is reliable, reset accurate and easy to assemble.

Description

Technical Field

[0001] This invention relates to the field of steering wheel assembly technology, and more particularly to a steering wheel assembly for an electric forklift. Background Technology

[0002] Electric forklift steering wheels often integrate discrete command buttons for frequent resets, such as horn, emergency stop, and slow speed, as well as lifting control buttons and speed adjustment knobs. However, there is room for improvement in the guiding and supporting structures of these buttons and knobs. In existing technology, discrete command buttons are reset only by a spring fitted onto a positioning post. This post can only prevent the spring from bending, but cannot restrict the horizontal movement and twisting of the keycap. Due to assembly gaps, uneven spring force, vibration, or lateral forces can easily cause the keycap to shift horizontally or twist, leading to inaccurate reset, accelerated wear, jamming, or failure to reach the correct position, affecting operational reliability. The lifting control button's rotating shaft and suspended operating component form a cantilever structure, which is subjected to lateral bending moments over long periods. Under vibration and impact, it is prone to wear and jamming, causing poor contact and signal jitter, affecting lifting accuracy and safety. Furthermore, the speed adjustment knob is only fixed at its base, with the operating part cantilevered. When subjected to bumps or lateral forces, it is prone to radial displacement, leading to increased resistance, poor feel, signal distortion, and reduced speed adjustment accuracy. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a steering wheel assembly for an electric forklift that is reliable in operation, accurate in resetting and easy to assemble.

[0004] The technical solution adopted by the present invention to solve its technical problem is to provide a steering wheel assembly for an electric forklift, comprising: The steering wheel body has a mounting groove, the bottom of which is provided with a positioning post and an anti-rotation groove, and the positioning post has a guide hole that runs through the axial direction. The instruction button is vertically mounted in the mounting groove and has a guide post that can be slidably extended into the guide hole, and an anti-rotation block that can be slidably inserted into the anti-rotation groove. The anti-rotation block and the anti-rotation groove have the same cross-sectional shape in the direction perpendicular to the lifting direction of the instruction button, and the cross-sectional shape is non-circular. A reset spring is sleeved on the positioning post, with one end abutting against the bottom wall of the mounting groove and the other end abutting against the inner wall of the command button.

[0005] In the aforementioned steering wheel assembly of an electric forklift, the cross-sectional shape is one of a rectangle, a T-shape, or a cross shape.

[0006] In the steering wheel assembly of the electric forklift described above, the command button is further provided with a first linkage part and a second linkage part located on both sides of the guide column. A linkage elastic element is rotatably provided in the mounting groove. One end of the linkage elastic element is connected to the first linkage part, and the other end is connected to the second linkage part. The linkage elastic element can drive the first linkage part and the second linkage part to move synchronously.

[0007] In the aforementioned steering wheel assembly of an electric forklift, the mounting groove is provided with a first through groove and a second through groove, and the first linkage part and the second linkage part are respectively disposed in the first through groove and the second through groove; the first through groove is provided with a first limiting part, the second through groove is provided with a second limiting part, and the first linkage part and the second linkage part are respectively provided with a first movable groove and a second movable groove for the first limiting part and the second limiting part to extend into, and the height of the first movable groove and the second movable groove along the moving direction of the command button is greater than the thickness of the first limiting part and the second limiting part in the same direction.

[0008] In the aforementioned steering wheel assembly of an electric forklift, the widths of the first through groove and the second through groove in the direction perpendicular to the movement direction of the command button are respectively greater than the thicknesses of the first linkage part and the second linkage part in the same direction.

[0009] In the aforementioned steering wheel assembly of an electric forklift, the steering wheel body further includes a receiving cavity, within which a first mounting portion is provided. The steering wheel body also includes a second mounting portion, and the second mounting portion has an assembly groove communicating with the receiving cavity. The steering wheel assembly further includes a potentiometer and a button linkage. The potentiometer is fixed to the first mounting portion and has a rotating shaft extending into the assembly groove. The button linkage is located within the assembly groove, with one end fixedly connected to the rotating shaft and the other end rotatably connected to the second mounting portion.

[0010] In the aforementioned steering wheel assembly of an electric forklift, the second mounting portion is provided with a limiting structure communicating with the assembly groove. The limiting structure includes a first limiting groove and a second limiting groove arranged coaxially and communicating with each other. The outer diameter of the second limiting groove is larger than the outer diameter of the first limiting groove, and the second limiting groove is located on the side of the first limiting groove away from the assembly groove. The button linkage has a connecting shaft that is rotatably accommodated in the first limiting groove and the second limiting groove.

[0011] In the aforementioned steering wheel assembly for an electric forklift, the steering wheel body includes a detachably connected upper cover and a lower cover, the upper cover and the lower cover together forming the receiving cavity, and the command button and / or the button linkage is integrated on the upper cover.

[0012] In the aforementioned steering wheel assembly of an electric forklift, the steering wheel body further has a first free end and a second free end disposed opposite to each other; the steering wheel assembly also includes a speed control knob, the speed control knob is mounted on the first free end, the speed control knob includes a rotatable rotating part, the rotating part extends to the second free end and has a groove, the second free end is provided with a protrusion, the protrusion extends into the groove, and there is an movable gap between the outer periphery of the protrusion and the inner wall of the groove.

[0013] In the aforementioned steering wheel assembly of an electric forklift, the outer peripheral surface of the protrusion is provided with a first arc surface, the opening edge of the groove is provided with a second arc surface opposite to the first arc surface, and there is a movable gap between the first arc surface and the second arc surface; the end of the protrusion facing the inner wall of the groove is provided with a spherical contact portion.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: 1. In this invention, the steering wheel body has a mounting groove, the bottom of which is provided with a positioning post and an anti-rotation groove. The positioning post has a guide hole that runs through the axis. The command button is movably mounted in the mounting groove and has a guide post that slidably extends into the guide hole, and an anti-rotation block that is slidably inserted into the anti-rotation groove. The anti-rotation block and the anti-rotation groove have the same cross-sectional shape perpendicular to the lifting direction of the command button, and the cross-sectional shape is non-circular. A return spring is sleeved on the positioning post, one end of which abuts against the bottom wall of the mounting groove, and the other end abuts against the inner wall of the command button. This design, through the cooperation of the non-circular cross-section anti-rotation block and the anti-rotation groove, ensures that the command button can only be lifted and lowered axially and cannot be rotated or twisted horizontally. This fundamentally solves the problems of inaccurate reset, accelerated wear, jamming, or incomplete positioning caused by the existing command button relying solely on the positioning post and spring for reset, significantly improving the operational reliability and service life of the command button.

[0015] 2. In this invention, the command button is further provided with a first linkage part and a second linkage part located on both sides of the guide post. A linkage elastic element is rotatably provided in the mounting groove. One end of the linkage elastic element is connected to the first linkage part, and the other end is connected to the second linkage part. The linkage elastic element can drive the first linkage part and the second linkage part to move synchronously. When the command button is eccentrically pressed, the linkage elastic element drives the linkage parts on both sides to move synchronously through elastic deformation, so that the button as a whole descends evenly, avoiding tilting or jamming caused by force on one side, thereby improving the operating feel and ensuring the stability of signal output.

[0016] 3. In this invention, the mounting groove is provided with a first through groove and a second through groove, and the first linkage part and the second linkage part are respectively inserted into the first through groove and the second through groove; the first through groove is provided with a first limiting part, and the second through groove is provided with a second limiting part; the first linkage part and the second linkage part are respectively provided with a first movable groove and a second movable groove for the first limiting part and the second limiting part to extend into, and the height of the first movable groove and the second movable groove along the moving direction of the command button is greater than the thickness of the first limiting part and the second limiting part in the same direction. This design mechanically limits the lifting stroke of the command button by the height difference between the limiting part and the movable groove, preventing the return spring from being over-compressed or the command button from falling out, while ensuring that the command button moves smoothly within the safe stroke, further improving the structural durability and operational safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the steering wheel assembly of an electric forklift according to the present invention.

[0018] Figure 2 This is a cross-sectional view of a steering wheel assembly for an electric forklift according to the present invention.

[0019] Figure 3 This is an exploded view of the steering wheel assembly of an electric forklift according to the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the instruction button in this invention.

[0021] Figure 5 This is a schematic diagram of the structure of the present invention after the lower cover is hidden.

[0022] Figure 6 This is a schematic diagram of the structure of the upper cover without the potentiometer and button linkage component in this invention.

[0023] Figure 7 This is a cross-sectional view of the steering wheel assembly of an electric forklift according to the present invention from another perspective.

[0024] Figure 8 This is a schematic diagram of the potentiometer in this invention.

[0025] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 100. Steering wheel body; 101. Upper cover; 102. Lower cover; 110. Mounting groove; 111. Positioning post; 111a. Guide hole; 112. Anti-rotation groove; 113. First through groove; 114. Second through groove; 115. First limiting part; 116. Second limiting part; 120. First mounting part; 121. Fixing groove; 130. Second mounting part; 131. Assembly groove; 140. Limiting structure; 141. First limiting groove; 142. Second limiting groove; 150. First free end; 160. Second free end From end; 161, protrusion; 162, first arc surface; 163, contact part; 200, command button; 201, guide post; 202, anti-rotation block; 203, first linkage part; 204, second linkage part; 205, first movable groove; 206, second movable groove; 300, return spring; 400, linkage elastic element; 500, potentiometer; 510, rotating shaft; 600, button linkage element; 610, connecting shaft; 700, speed control knob; 710, rotating part; 711, groove; 712, second arc surface. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0028] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0031] like Figures 1 to 8 As shown, in this embodiment, a steering wheel assembly for an electric forklift includes: The steering wheel body 100 has a mounting groove 110, and the bottom of the mounting groove 110 is provided with a positioning post 111 and an anti-rotation groove 112. The positioning post 111 has a guide hole 111a that runs through the axial direction. The instruction button 200 is vertically mounted in the mounting groove 110 and has a guide post 201 that can be slidably inserted into the guide hole 111a, and an anti-rotation block 202 that can be slidably inserted into the anti-rotation groove 112. The anti-rotation block 202 and the anti-rotation groove 112 have the same cross-sectional shape in the direction perpendicular to the lifting direction of the instruction button 200, and the cross-sectional shape is non-circular. A return spring 300 is sleeved on the positioning post 111, with one end abutting against the bottom wall of the mounting groove 110 and the other end abutting against the inner wall of the command button 200. This design, through the cooperation of the non-circular cross-section anti-rotation block 202 and the anti-rotation groove 112, ensures that the command button 200 can only move up and down axially and cannot rotate or twist horizontally. This fundamentally solves the problems of inaccurate reset, accelerated wear, jamming, or incomplete positioning caused by the existing command button 200 relying solely on the positioning post 111 spring for reset, significantly improving the operational reliability and service life of the command button 200.

[0032] Specifically, this embodiment provides a steering wheel with integrated control buttons, primarily used in the forklift field, to integrate functions such as horn warning, emergency stop and slow driving, mast lifting control, and driving speed adjustment. This steering wheel assembly improves uniform downward movement during eccentric pressing by optimizing the reset structure of the command button 200, adding a linkage elastic element 400, and incorporating end-support structures for the potentiometer 500 and auxiliary support designs for the speed control knob 700. These improvements address issues in existing technologies such as inaccurate button reset, jitter in the lifting control signal, and radial offset of the speed control knob 700, significantly enhancing the operational reliability, control accuracy, and service life of the steering wheel assembly.

[0033] like Figures 1 to 8As shown, in this embodiment, the steering wheel body 100 is formed by a detachably fastened upper cover 101 and a lower cover 102, which are fixedly connected by clips or screws, forming a closed receiving cavity for accommodating various control components. This split structure allows for the exposure of the internal structure simply by separating the upper cover 101 and the lower cover 102 when inspecting internal components, without disassembling the entire steering wheel assembly, significantly improving maintenance convenience.

[0034] Preferably, the command button 200 and the button linkage 600 are integrated on the upper cover 101. This design makes the upper cover 101 an independent functional module. During maintenance, only the upper cover 101 needs to be removed, without disassembling the lower cover 102 which is fixedly connected to the steering column, thus avoiding the impact of repeated disassembly and assembly on the reliability of the steering connection.

[0035] Furthermore, the upper cover 101 has a mounting groove 110 on the side opposite to the lower cover 102 to accommodate instruction buttons 200 with different functions. Preferably, there are multiple mounting grooves 110, which are used for horn warning, emergency stop, and slow driving, respectively. Each instruction button 200 is independent of the others to meet the various operating needs of the forklift.

[0036] Furthermore, the bottom of the mounting groove 110 is provided with a positioning post 111 and an anti-rotation groove 112. The positioning post 111 is a hollow cylinder, serving as the mounting base for the return spring 300. Its interior has a through guide hole 111a along the axial direction, providing sliding guidance for the guide post 201 of the command button 200. The anti-rotation groove 112 is located on one or both sides of the positioning post 111. Its cross-sectional shape is the same as that of the anti-rotation block 202 in the direction perpendicular to the lifting and lowering of the command button 200, and both are non-circular. It cooperates with the anti-rotation block 202 to achieve circumferential limiting, thereby preventing the command button 200 from moving horizontally or rotating around its axis during lifting and lowering.

[0037] Preferably, the anti-rotation groove 112 is provided in two sets, located on both sides of the positioning column 111 respectively. The symmetrical arrangement on both sides can make the command button 200 more evenly stressed, further improving the anti-rotation effect and lifting stability.

[0038] Furthermore, the cross-sectional shape can be rectangular, T-shaped, or cross-shaped. This design is simple in structure, easy to process and form, and can provide reliable circumferential constraints, effectively preventing button twisting while reducing manufacturing costs.

[0039] Furthermore, the return spring 300 is sleeved on the positioning post 111, with one end abutting against the bottom wall of the mounting groove 110 and the other end abutting against the inner wall of the command button 200. When the command button 200 is pressed, the return spring 300 is compressed and stores elastic potential energy; after being released, the spring force drives the command button 200 to rise and reset, which, together with the guiding effect of the anti-rotation structure, achieves precise return to position.

[0040] In this embodiment, a plurality of instruction buttons 200 are provided, which are respectively arranged in corresponding installation grooves 110 in a liftable manner, and are used to independently control functions such as horn warning, emergency stop, and slow speed driving.

[0041] Furthermore, on one side of each instruction button 200 facing the bottom of the installation groove 110, a guiding column 201 and an anti-rotation block 202 are provided. Among them, the guiding column 201 is slidably inserted into the guiding hole 111a of the positioning column 111, and the anti-rotation block 202 is slidably embedded in the anti-rotation groove 112. There is a sliding gap between the outer wall of the guiding column 201 and the inner wall of the guiding hole 111a. This sliding gap ensures that the guiding column 201 can smoothly lift and slide in the guiding hole 111a, avoiding jamming or increased movement resistance caused by interference fit, while not affecting the axial guiding accuracy. The anti-rotation block 202 and the anti-rotation groove 112 are in non-circular cross-section fit, and there is also an appropriate sliding gap between them to ensure circumferential limit while achieving low-friction lifting.

[0042] Furthermore, on the instruction button 200, a first linkage portion 203 and a second linkage portion 204 are respectively provided on both sides of the guiding column 201. A linkage elastic member 400 is rotatably provided in the installation groove 110. One end of the linkage elastic member 400 is connected to the first linkage portion 203, and the other end is connected to the second linkage portion 204, and the linkage elastic member 400 can drive the first linkage portion 203 and the second linkage portion 204 to move synchronously. This design enables the linkage elastic member 400 to drive the two-side linkage portions to move synchronously through elastic deformation when the instruction button 200 is eccentrically pressed, causing the button as a whole to descend evenly, avoiding tilting or jamming caused by unilateral force, thus improving the operation feel and ensuring the stability of signal output.

[0043] Preferably, the first linkage portion 203 and the second linkage portion 204 have the same structure, are in a strip structure, vertically extend from the inner wall of the instruction button 200 towards the installation groove 110, and each has a circular installation hole for fixedly connecting the linkage elastic member 400.

[0044] Preferably, the linkage elastic member 400 is in a zigzag shape. The two ends at the opening are respectively detachably inserted into the installation holes of the first linkage portion 203 and the second linkage portion 204, while the closed side is rotatably clamped on the U-shaped depression in the installation groove 110. When the instruction button 200 is pressed at an eccentric position, one side of the first linkage portion 203 or the second linkage portion 204 moves downward, and the movement is transmitted to the other side of the second linkage portion 204 or the first linkage portion 203 through the elastic deformation of the zigzag elastic member, thereby driving the two sides to lift and lower synchronously and ensuring that the button as a whole moves downward evenly. This zigzag structure is not only convenient for installation, but also has a stable elastic restoring force, which can effectively prevent the button from tilting and improve the operation feel and signal reliability.

[0045] Furthermore, the mounting groove 110 is provided with a first through groove 113 and a second through groove 114, and the first linkage part 203 and the second linkage part 204 are respectively inserted into the first through groove 113 and the second through groove 114; the first through groove 113 is provided with a first limiting part 115, and the second through groove 114 is provided with a second limiting part 116. The first linkage part 203 and the second linkage part 204 are respectively provided with a first movable groove 205 and a second movable groove 206 for the first limiting part 115 and the second limiting part 116 to extend into, and the height of the first movable groove 205 and the second movable groove 206 along the moving direction of the command button 200 is greater than the thickness of the first limiting part 115 and the second limiting part 116 in the same direction. This design mechanically limits the lifting stroke of the command button 200 by the height difference between the limiting part and the movable groove, preventing the return spring 300 from being over-compressed or the command button 200 from falling out, while ensuring that the command button 200 moves smoothly within the safe stroke, further improving the structural durability and operational safety.

[0046] Preferably, the first through groove 113 and the second through groove 114 are U-shaped, with their openings facing the positioning post 111, and cooperate with the bottom wall of the mounting groove 110 to form the first limiting part 115 and the second limiting part 116. The first limiting part 115 and the second limiting part 116 are rectangular blocks, protruding from the first through groove 113 and the second through groove 114 respectively, for cooperating with the movable grooves on the first linkage part 203 and the second linkage part 204 to limit the lifting stroke of the command button 200. This U-shaped structure is easy to process and form, while the rectangular limiting part can provide a stable abutment plane, ensuring the accuracy and durability of the stroke limit.

[0047] Furthermore, the widths of the first through groove 113 and the second through groove 114 in the direction perpendicular to the movement of the command button 200 are respectively greater than the thicknesses of the first linkage part 203 and the second linkage part 204 in the same direction. This design provides lateral movement space for the first linkage part 203 and the second linkage part 204, so that they can be easily aligned during assembly, avoiding lateral compression caused by dimensional deviations or assembly errors, and reducing assembly difficulty.

[0048] To integrate the lift button, in this embodiment, a first mounting portion 120 is provided within the receiving cavity. This first mounting portion 120 extends vertically from the inner wall of the upper cover 101 towards the lower cover 102, and is generally block-shaped. A second mounting portion 130 is also integrated on the upper cover 101 of the steering wheel body 100. The second mounting portion 130 protrudes outward from the mounting arm and has an assembly groove 131 communicating with the receiving cavity. This assembly groove 131 extends radially along the steering wheel. The first mounting portion 120 is used to mount the potentiometer 500, which implements the lift control function, and the second mounting portion 130 is used to mount the button linkage component 600 connected to the potentiometer 500. This design separates the core component of lift control (potentiometer 500) and the transmission component (button linkage component 600) in the first mounting portion 120 and the second mounting portion 130, ensuring the accuracy of action transmission while utilizing the integrated structure of the upper cover 101 to reduce the dispersed arrangement of components, thus improving assembly efficiency and structural compactness.

[0049] Furthermore, the first mounting part 120 is provided with a fixing groove 121, the shape of which is adapted to the outline of the potentiometer 500 body and is used for mounting the potentiometer 500. The protrusion on the outer outline of the potentiometer 500 cooperates with the recess in the fixing groove 121 to achieve foolproof positioning.

[0050] Furthermore, the steering wheel assembly also includes a potentiometer 500 and a button linkage 600. The potentiometer 500 is fixed in a mounting groove 121 on the first mounting portion 120 and has a rotating shaft 510 that extends into a mounting groove 131. The button linkage 600 is located in the mounting groove 131, with one end fixedly connected to the rotating shaft 510 and the other end rotatably connected to the second mounting portion 130. This design transforms the button linkage 600 from a traditional cantilever support to a two-end support, and the rotating shaft 510 only bears torque and no longer bears lateral bending moment, thereby fundamentally avoiding wear, jamming, or signal jitter caused by long-term bending, and significantly improving the service life and control reliability of the potentiometer 500.

[0051] Furthermore, the second mounting part 130 is provided with a limiting structure 140 that communicates with the assembly groove 131. The limiting structure 140 includes a first limiting groove 141 and a second limiting groove 142 that are coaxially arranged and communicate with each other. The first limiting groove 141 is a U-shaped groove (open at the top), and the second limiting groove 142 is an annular groove.

[0052] The outer diameter of the second limiting groove 142 is larger than the outer diameter of the first limiting groove 141, and the second limiting groove 142 is located on the side of the first limiting groove 141 opposite to the assembly groove 131; the button linkage 600 has a connecting shaft 610 that is rotatably accommodated in the first limiting groove 141 and the second limiting groove 142. This design allows the connecting shaft 610 of the button linkage 600 to first extend into the second limiting groove 142 with a larger outer diameter in an inclined posture, and then be laid flat and snapped into the first limiting groove 141, achieving rapid assembly without strict axial alignment, significantly reducing the assembly difficulty. At the same time, the two limiting grooves together form a stable radial support for the connecting shaft 610, ensuring rotational coaxiality and avoiding additional loads caused by shaking.

[0053] To achieve the integration of the speed control knob 700, in this embodiment, the steering wheel body 100 also has a first free end 150 and a second free end 160 arranged opposite to each other. This design, by setting two opposite free ends, provides a dual positioning foundation for the speed control knob 700, with root mounting and end auxiliary support, which facilitates the subsequent implementation of anti-offset function and also contributes to a compact structural layout.

[0054] Furthermore, the steering wheel assembly also includes a speed control knob 700, which is mounted on the first free end 150. The speed control knob 700 includes a rotatable rotating part 710, which extends to the second free end 160 and has a groove 711. The second free end 160 is provided with a protrusion 161, which extends into the groove 711, and there is a movable gap between the outer periphery of the protrusion 161 and the inner wall of the groove 711. This design breaks away from the limitations of traditional speed control knobs 700 that are fixed only at the base. Through the gap fit between the protrusion 161 and the groove 711, the rotating part 710 is allowed to rotate freely under normal conditions. When the rotating part 710 is radially offset due to vibration or lateral force, the protrusion 161 and the inner wall of the groove 711 abut against each other to form a mechanical limit, effectively restricting the excessive drooping or swaying of the knob extension end. This avoids problems such as increased rotational resistance, poor operating feel, and decreased control accuracy, and significantly improves the speed control knob 700's anti-offset capability and operational reliability under complex working conditions.

[0055] Furthermore, the outer peripheral surface of the protrusion 161 is provided with a first arc surface 162, and the opening edge of the groove 711 is provided with a second arc surface 712 opposite to the first arc surface 162, and there is a movable gap between the first arc surface 162 and the second arc surface 712; the end of the protrusion 161 facing the inner wall of the groove 711 is provided with a spherical contact portion 163. When the speed control knob 700 deviates, this design provides smooth guidance through the mutual cooperation of the first arc surface 162 and the second arc surface 712, avoiding sharp corner interference; at the same time, the spherical contact portion 163 forms point contact with the inner wall of the groove 711, effectively reducing the contact area and frictional resistance during contact, reducing wear, and improving the durability and smoothness of operation of the limiting structure 140.

Claims

1. A steering wheel assembly for an electric forklift, characterized in that, include: The steering wheel body has a mounting groove, the bottom of which is provided with a positioning post and an anti-rotation groove, and the positioning post has a guide hole that runs through the axial direction. The instruction button is vertically mounted in the mounting groove and has a guide post that can be slidably extended into the guide hole, and an anti-rotation block that can be slidably inserted into the anti-rotation groove. The anti-rotation block and the anti-rotation groove have the same cross-sectional shape in the direction perpendicular to the lifting direction of the instruction button, and the cross-sectional shape is non-circular. A reset spring is sleeved on the positioning post, with one end abutting against the bottom wall of the mounting groove and the other end abutting against the inner wall of the command button.

2. The steering wheel assembly of an electric forklift according to claim 1, characterized in that, The cross-sectional shape is one of a rectangle, a T-shape, or a cross shape.

3. The steering wheel assembly of an electric forklift according to claim 1, characterized in that, The instruction button is also provided with a first linkage part and a second linkage part located on both sides of the guide post. A linkage elastic element is rotatably provided in the mounting groove. One end of the linkage elastic element is connected to the first linkage part and the other end is connected to the second linkage part. The linkage elastic element can drive the first linkage part and the second linkage part to move synchronously.

4. The steering wheel assembly of an electric forklift according to claim 3, characterized in that, The mounting groove is provided with a first through groove and a second through groove, and the first linkage part and the second linkage part are respectively inserted into the first through groove and the second through groove; the first through groove is provided with a first limiting part, and the second through groove is provided with a second limiting part; the first linkage part and the second linkage part are respectively provided with a first movable groove and a second movable groove for the first limiting part and the second limiting part to extend into, and the height of the first movable groove and the second movable groove along the moving direction of the command button is greater than the thickness of the first limiting part and the second limiting part in the same direction.

5. The steering wheel assembly of an electric forklift according to claim 4, characterized in that, The widths of the first through slot and the second through slot in the direction perpendicular to the movement direction of the command button are respectively greater than the thicknesses of the first linkage part and the second linkage part in the same direction.

6. The steering wheel assembly of an electric forklift according to claim 1, characterized in that, The steering wheel body also has a receiving cavity, in which a first mounting part is provided, and the steering wheel body also has a second mounting part, and the second mounting part has an assembly groove communicating with the receiving cavity; the steering wheel assembly also includes a potentiometer and a button linkage, the potentiometer is fixed on the first mounting part and has a rotating shaft, the rotating shaft extending into the assembly groove; the button linkage is located in the assembly groove, one end of which is fixedly connected to the rotating shaft, and the other end is rotatably connected to the second mounting part.

7. The steering wheel assembly of an electric forklift according to claim 6, characterized in that, The second mounting part is provided with a limiting structure communicating with the assembly groove. The limiting structure includes a first limiting groove and a second limiting groove arranged coaxially and communicating with each other. The outer diameter of the second limiting groove is larger than the outer diameter of the first limiting groove, and the second limiting groove is located on the side of the first limiting groove away from the assembly groove. The button linkage has a connecting shaft that is rotatably accommodated in the first limiting groove and the second limiting groove.

8. The steering wheel assembly of an electric forklift according to claim 6, characterized in that, The steering wheel body includes a detachably connected upper cover and a lower cover, which together form the receiving cavity, and the command button and / or the button linkage are integrated on the upper cover.

9. The steering wheel assembly of an electric forklift according to claim 1, characterized in that, The steering wheel body also has a first free end and a second free end disposed opposite to each other; the steering wheel assembly also includes a speed control knob, the speed control knob is mounted on the first free end, the speed control knob includes a rotatable rotating part, the rotating part extends to the second free end and has a groove, the second free end is provided with a protrusion, the protrusion extends into the groove, and there is an movable gap between the outer periphery of the protrusion and the inner wall of the groove.

10. A steering wheel assembly for an electric forklift according to claim 9, characterized in that, The outer peripheral surface of the protrusion is provided with a first arc surface, and the opening edge of the groove is provided with a second arc surface opposite to the first arc surface, and there is a movable gap between the first arc surface and the second arc surface; the end of the protrusion facing the inner wall of the groove is provided with a spherical contact portion.

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