Rear-pulling type side door hinge assembly of electric forklift and electric forklift

Abstract

The rear-pull type side door hinge assembly of the electric forklift comprises an installation seat, a second shaft sleeve, a first rocker arm and a second rocker arm are arranged at one end of the installation seat, the second shaft sleeve is installed on the installation seat through a first adjusting bolt, and the first rocker arm is located above the second rocker arm. Connecting rod seats are arranged at the ends, away from the mounting seat, of the first rocker arm and the second rocker arm and fixedly arranged on a bottom plate, a main roller and a spring lock are arranged on the side, located on the connecting rod seats, of the bottom plate, and a side roller is arranged on the side, away from the connecting rod seats, of the bottom plate; a lock is arranged between the first adjusting bolt and the mounting seat, and the lock and the second shaft sleeve synchronously move; a second adjusting bolt is further arranged at the lower end of the mounting base, located below the second rocker arm and used for conducting lower limiting on the second rocker arm. The electric forklift side door hinge solves the problems that an existing electric forklift side door hinge is large in occupied space in a rotating opening and closing mode, and a quadrilateral connecting rod hinge upward opening and closing mode is strenuous.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, in particular to a rear-pull type side door hinge assembly for an electric forklift and an electric forklift. Background Art

[0002] For electric forklifts, with batteries as the power source, lead-acid batteries and lithium (ion) batteries are still mainly used at present. Except for electric vehicle models developed based on internal combustion platforms, most electric forklifts adopt the layout scheme of placing the battery in the middle and sinking (which is beneficial to reducing the overall vehicle center of gravity and improving stability), that is, side-shovel vehicle models. The structural features are: one side or both sides of the frame battery compartment are open and are provided with openable side doors. On the one hand, it is convenient for the loading and unloading of the battery. On the other hand, it is beneficial to the dissipation of the gas released during the charging process of the battery (especially lead-acid batteries).

[0003] At present, there are two common opening and closing methods for the side doors of forklifts: one is the hinge form. The side door makes an arc movement with the hinge hinge point as the rotation point. However, due to structural limitations, most hinge hinges cannot achieve 180° opening and closing. Secondly, a relatively large space is required during the process of opening the side door, and the side door needs to be fixed at a necessary position. The other is the quadrilateral link structure. The side door makes an up and down translation movement, similar to the opening and closing structure of the luggage compartment door of a passenger car. The side door is opened by pulling outwards and lifting upwards, and closed by pulling downwards and pushing inwards. A relatively large force is required for opening and closing. At the same time, in order to prevent the side door from accidentally falling, a safety mechanism is indispensable. Content of the Utility Model

[0004] Based on the technical problems existing in the background art, the utility model provides a rear-pull type side door hinge assembly for an electric forklift and an electric forklift, which solves the problems that the rotation opening and closing method of the side door hinge of the existing electric forklift occupies a large space, and the upward opening and closing method of the quadrilateral link hinge is laborious, etc.

[0005] The rear-pull type side door hinge assembly for an electric forklift provided by the utility model includes a mounting seat. One end of the mounting seat is provided with a second bushing, a first rocker arm and a second rocker arm. The second bushing is installed on the mounting seat through a first adjusting bolt. The first rocker arm is located above the second rocker arm. Link seats are arranged at the ends of the first rocker arm and the second rocker arm far away from the mounting seat. The link seats are fixedly arranged on a bottom plate. A main roller and a catch are arranged on one side of the bottom plate where the link seat is located. Side rollers are arranged on the other side of the bottom plate far away from the link seat. The side rollers correspond to the main rollers one by one.

[0006] Preferably, a lock is arranged between the first adjusting bolt and the mounting seat, and the lock moves synchronously with the second bushing.

[0007] Preferably, a second adjusting bolt is further provided at the lower end of the mounting seat. The second adjusting bolt is located below the second rocker arm and is used to limit the downward movement of the second rocker arm.

[0008] Preferably, thrust washers are provided between the first rocker arm and the second rocker arm and the mounting seat.

[0009] The electric forklift proposed by the present utility model includes the above-mentioned rear-pull type side door hinge assembly of the electric forklift.

[0010] Preferably, it further includes a vehicle body assembly and a side door assembly. The side door assembly is movably connected to the vehicle body assembly through a plurality of the hinge assemblies.

[0011] Preferably, the vehicle body assembly includes a vehicle frame. One end of the vehicle frame is provided with a rear axle and a counterweight, and the other end of the vehicle frame is provided with a fender and a lock ring.

[0012] Preferably, the side door assembly includes a side door panel. The side door panel is provided with a first guide rail, a second guide rail, a door lock, a plurality of rib groups and a plurality of handles. First bushings and mounting brackets are provided at both ends of the first guide rail and the second guide rail. The first bushings and the mounting brackets can be adjusted in position along the length direction of the first guide rail / second guide rail. A catch is further provided on the mounting bracket, and the catch corresponds to the locking latch one by one.

[0013] Preferably, the handle is connected with a door lock hook to control the locking and unlocking of the door lock hook and the lock ring.

[0014] Preferably, an adjustment window for adjusting the position of the first adjusting bolt is further provided on the vehicle frame.

[0015] The beneficial technical effects of the present utility model:

[0016] 1. The present utility model combines a vertical double-rocker link rotation structure and a horizontal slide rail structure to form a hinge assembly, enabling the front-back push-pull closing method of the forklift side door without pre-burying a slide rail on the counterweight; the double-rocker link rotation structure first ensures the structural strength of the hinge, and secondly, the side door can move a certain distance outside the vehicle body and the counterweight, thus providing space for pushing and pulling; the horizontal slide rail structure enables the forklift to open and close the side door in a narrow passage, facilitating the maintenance of internal components of the forklift.

[0017] 2. Compared with the opening and closing method of the side door of existing forklifts: for the hinge, due to its rotational characteristics, sufficient gaps need to be left between the side door and the covering parts such as the front and rear fender of the vehicle body to prevent rotational interference. However, for the vertical double rocker link rotational structure of the present utility model, the side door is essentially making a planar motion rather than a rotational motion. Therefore, there is no problem of rotational interference, thus reducing the gap between the side door and the covering parts and improving the aesthetic appearance of the forklift. The four-link hinge of the upward-pulling type has a large stroke, making it relatively laborious to open and close the door, and a strut needs to be set for safety protection after the side door is pulled open upward. The hinge assembly of the present utility model has a small up and down stroke (mainly providing space for pushing and pulling back and forth, without the need for a large stroke), so it is more labor-saving. For the side-sliding door of the automotive track type, tracks need to be installed at the rear side of the vehicle side door. For a forklift, the rear side of the side door is a cast iron counterweight, and it is costly to embed tracks or preset track installation grooves in the counterweight. Secondly, when the forklift side door is closed, the counterweight, the side door, and the covering parts on the front side of the side door are basically on the same plane inside. If tracks are not preset on the counterweight, there will be no space for the side door to move backward. The present utility model combines a double rocker link rotational structure and a horizontal slide rail structure to form a hinge assembly. Before the backward pulling action of the side door, the side door is first moved a certain distance outward from the counterweight, thus providing a movement space for the backward pull.

[0018] 3. The opening and closing process of the side door of the present utility model is simple. The side door does not require a large space to open, and after the side door is opened, it is located on the side of the counterweight, having little impact on various inspections of the forklift. Brief Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the state of the backward-pulling type side door hinge assembly of the electric forklift proposed by the present utility model when the side door is opened.

[0020] Figure 2 It is a schematic diagram of the state of the backward-pulling type side door hinge assembly of the electric forklift proposed by the present utility model when the side door is closed.

[0021] Figure 3 It is the front view of the electric forklift proposed by the present utility model when the side door is opened.

[0022] Figure 4 It is the top view of the electric forklift proposed by the present utility model when the side door is opened.

[0023] Figure 5 It is the front view of the electric forklift proposed by the present utility model when the side door is closed.

[0024] Figure 6 It is the top view of the electric forklift proposed by the present utility model when the side door is closed.

[0025] Figure 7 It is a partial schematic diagram of the electric forklift proposed by the present utility model when the side door is opened.

[0026] Figure 8This is an enlarged view of the hinge assembly when the side door of the electric forklift proposed by the present utility model is opened.

[0027] Figure 9 This is a schematic diagram of the inner structure of the side door of the electric forklift proposed by the present utility model.

[0028] Figure 10 This is a schematic diagram of the structure of the hinge assembly when the side door of another embodiment of the electric forklift proposed by the present utility model is opened.

[0029] In the figure: 1 - vehicle body assembly, 101 - fender, 102 - lock ring, 103 - vehicle frame, 104 - rear axle, 105 - counterweight, 106 - adjustment window, 2 - side door assembly, 201 - side door panel, 202 - rib plate group, 203 - first guide rail, 204 - door lock, 205 - first bushing, 206 - mounting bracket, 207 - buckle, 208 - second guide rail, 209 - handle, 3 - hinge assembly, 301 - main roller, 302 - mounting seat, 303 - second bushing, 304 - locking, 305 - first adjusting bolt, 306 - contact lock, 307 - side roller, 308 - connecting rod seat, 309 - bottom plate, 310 - first rocker arm, 311 - second rocker arm, 312 - second adjusting bolt, 313 - thrust washer. Detailed implementation manners

[0030] The following further explains the present utility model in conjunction with specific embodiments. Embodiment 1

[0031] Refer to Figure 1 and Figure 2, for the rear-pull side door hinge assembly of the electric forklift proposed by the present utility model, the hinge assembly 3 includes a mounting seat 302. The mounting seat is installed at one end of the vehicle frame close to the counterweight through fasteners. One end of the mounting seat 302 is provided with two groups of mounting holes and a waist-shaped hole. The second bushing 303 is slidably installed in the waist-shaped hole of the mounting seat through the first adjusting bolt 305. The lock 304 is also slidably installed on the waist-shaped hole of the mounting seat through the first adjusting bolt. The lock 304 is a spring piece, and the spring piece and the second bushing move synchronously. The first rocker arm 310 is coaxially and rotatably installed in the mounting hole of the mounting seat close to the waist-shaped hole through fasteners. The second rocker arm 311 is coaxially and rotatably installed in the mounting hole of the mounting seat far from the waist-shaped hole through fasteners. The first rocker arm 310 is located above the second rocker arm 311. Thrust washers 313 are provided between the first rocker arm 310 and the second rocker arm 311 and the mounting seat 302. One end of the first rocker arm 310 far from the mounting seat 302 is coaxially and rotatably installed in the mounting hole on the upper side of the connecting rod seat through fasteners. One end of the second rocker arm 311 far from the mounting seat 302 is coaxially and rotatably installed in the mounting hole on the lower side of the connecting rod seat through fasteners. The connecting rod seat 308 is fixedly arranged on the bottom plate 309. At least two main rollers 301 and two groups of catches 306 are provided on one side of the bottom plate 309 where the connecting rod seat 308 is located. At least two side rollers 307 are provided on the side of the bottom plate 309 far from the connecting rod seat 308. The side rollers 307 correspond to the main rollers 301 one by one.

[0032] In addition, a second adjusting bolt 312 is further provided at the lower end of the mounting seat 302. The second adjusting bolt 312 is located below the second rocker arm 311 and is used for lower limit positioning of the second rocker arm 311.

[0033] The effective lengths of the first rocker arm and the second rocker arm of the present utility model are the same (the effective length refers to the straight-line distance between the axes of the mounting holes at the first end and the second end of the first rocker arm and the second rocker arm). Therefore, the connecting rod seat and the bottom plate can perform translational motion.

[0034] The present utility model can adjust the upper and lower limit positions of the hinge assembly through the first adjusting bolt and the second adjusting bolt: when the side door assembly is opened, the second bushing and the spring piece perform upper and lower limit positioning on the first rocker arm, that is, by adjusting the positions of the second bushing and the spring piece, the upper and lower limit positions of the first rocker arm can be adjusted up and down; when the side door assembly is closed, the second adjusting bolt performs lower limit positioning on the second rocker arm, that is, by adjusting the length of the second adjusting bolt screwed in, the lower limit position of the second rocker arm can be adjusted.

[0035] A scale line is further provided on the waist-shaped hole of the mounting seat of the present utility model, which is used to record the appropriate position points during the adjustment process of the first adjusting bolt, facilitating the installation of the side door assembly in subsequent production. Embodiment 2

[0036] Refer to Figure 3 , Figure 7 andFigure 8 The electric forklift proposed by the present utility model includes the rear-pull side door hinge assembly in Embodiment 1.

[0037] In addition, the electric forklift further includes a vehicle body assembly 1 and a side door assembly 2, and the side door assembly 2 is movably connected to the vehicle body assembly 1 through a plurality of hinge assemblies 3.

[0038] Refer to Figure 3-7 , the vehicle body assembly 1 includes a vehicle frame 103, a rear axle 104 and a counterweight 105 are arranged at one end of the vehicle frame 103, and a fender 101 and a lock ring 102 are arranged at the other end of the vehicle frame 103; an adjustment window 106 for adjusting the position of the first adjustment bolt 305 is also arranged on the vehicle frame 103.

[0039] A battery compartment that is open on one side or both sides is provided in the middle of the vehicle frame for loading and unloading the power-driven battery. A set of side door assemblies is provided on the open side of the vehicle frame battery compartment, and the vehicle frame and the side door assemblies are movably connected through at least two sets of hinge assemblies.

[0040] Refer to Figure 3 and Figure 9 , the side door assembly 2 includes a side door panel 201, the side door panel 201 is provided with a first guide rail 203, a second guide rail 208, a door lock 204, a plurality of rib groups 202 and a plurality of handles 209. A set of waist holes are respectively provided at the head and tail ends of the first guide rail 203 and the second guide rail 208, and a set of first bushings 205 and mounting brackets 206 are respectively installed in the waist holes through fasteners. The first bushings 205 and the mounting brackets 206 can be adjusted in position along the length direction of the first guide rail 203 / the second guide rail 208. A snap button 207 is also arranged on the mounting bracket 206, and the snap button 207 corresponds to the snap lock 306 one by one; the handle 209 is connected with a door lock hook to control the locking and unlocking of the door lock hook and the lock ring 102.

[0041] The lock ring of the present utility model can be adjusted in position away from or close to the side door panel, and the cross-sectional shapes of the first guide rail and the second guide rail are the same and are symmetrically arranged up and down.

[0042] In the middle of the frame of this embodiment, there is a battery compartment open on one side. There are three main rollers on the upper and lower sides of the first end of the bottom plate, and three side rollers are provided at the second end of the bottom plate; Install the side door assembly: The outer circumferential surfaces of the three main rollers on the upper and lower sides of the first end of the bottom plate are tangent to the bottom surfaces of the upper and lower sides of the first guide rail or the second guide rail, and the outer circumferential surfaces of the three side rollers at the second end of the bottom plate are tangent to the inner side surfaces of the first guide rail or the second guide rail. By adjusting the first adjusting bolt and the lock ring, when the side door assembly is completely closed, the door lock hook engages with the lock ring, the outer side surface of the side door panel is basically flush with the outer surface of the fender and the edge of the counterweight, and the front and rear edges of the side door panel have appropriate gaps with the fender and the counterweight. The cylindrical surface of the second bushing is tangent to the outer arc surface of the outer diameter of the first rocker arm, and the inner side outer surface of the elastic piece is tangent to the inner arc surface of the inner diameter of the first rocker arm. Adjust the position of the first bushing at the front end of the first guide rail and the second guide rail to make the snap buckle at the front end of the first guide rail and the second guide rail engage with the snap lock at the front end of the hinge assembly when the side door assembly is completely closed; By adjusting the second adjusting bolt, when the side door assembly is completely opened, there is no interference between the side door assembly and the counterweight, and the upper surface of the second adjusting bolt contacts the lower surface of the second rocker arm. Adjust the position of the first bushing at the tail end of the first guide rail and the second guide rail to make the snap buckle at the tail end of the first guide rail and the second guide rail engage with the snap lock at the tail end of the hinge assembly when the side door assembly is completely opened.

[0043] The opening and closing process of the side door in this embodiment is as follows: 1) Open the side door assembly: Unlock the door lock hook and the lock ring through the handle, pull the side door panel outward, and under the action of gravity, the side door panel moves downward at the same time. After the second rocker arm contacts the second adjusting bolt (the side door panel no longer moves downward), pull the side door panel backward to disengage the snap lock at the front end of the hinge assembly from the snap buckles at the front ends of the first guide rail and the second guide rail until the snap lock at the tail end of the hinge assembly engages with the snap buckles at the tail ends of the first guide rail and the second guide rail, completing the opening of the side door assembly; 2) Close the side door assembly: Pull the side door panel forward to disengage the snap lock at the tail end of the hinge assembly from the snap buckles at the tail ends of the first guide rail and the second guide rail until the snap lock at the front end of the hinge assembly engages with the snap buckles at the front ends of the first guide rail and the second guide rail, then lift and push the side door panel inward until the first rocker arm moves between the elastic piece and the second bushing. At this time, the lock ring and the door lock hook have also engaged, completing the closing of the side door assembly. Embodiment 3

[0044] As Figure 10 shown, replace the lock stop 304 of the hinge assembly 3 in the above embodiment with a push-pull rod driven by an electromagnetic drive. The first rocker arm 310 is limited by the push-pull rod. During the opening or closing process of the side door assembly 2, by controlling the power-on of the electromagnetic drive of the push-pull rod, the push-pull rod contracts, so that the first rocker arm 310 can be restricted by the push-pull rod. When it moves to the specified position, the electromagnetic drive of the push-pull rod loses power, and the push-pull rod pops out and resets to restore the limit on the first rocker arm 310.

Claims

1. The rear-pull side door hinge assembly of an electric forklift is characterized by: The hinge assembly (3) comprises a mounting seat (302), one end of which is provided with a second shaft sleeve (303), a first rocker arm (310) and a second rocker arm (311), the second shaft sleeve (303) being mounted on the mounting seat (302) via a first adjusting bolt (305), the first rocker arm (310) being located above the second rocker arm (311), a connecting rod seat (308) being provided at one end of the first rocker arm (310) and the second rocker arm (311) away from the mounting seat (302), the connecting rod seat (308) being fixedly arranged on a bottom plate (309), a main roller (301) and a latch (306) being provided on one side of the bottom plate (309) located on the connecting rod seat (308), and a side roller (307) being provided on one side of the bottom plate (309) away from the connecting rod seat (308), the side roller (307) being corresponding to the main roller (301) one by one.

2. The rear-pull side door hinge assembly of an electric forklift according to claim 1, characterized in that: A lock (304) is provided between the first adjusting bolt (305) and the mounting seat (302), and the lock (304) moves synchronously with the second shaft sleeve (303).

3. The rear-pull side door hinge assembly of an electric forklift according to claim 1, characterized in that: A second adjusting bolt (312) is also provided at the lower end of the mounting seat (302); the second adjusting bolt (312) is located below the second rocker arm (311) and is used to lower the second rocker arm (311).

4. The rear-pull side door hinge assembly of an electric forklift according to claim 1, characterized in that: Thrust washers (313) are provided between the first rocker arm (310) and the second rocker arm (311) and the mounting seat (302).

5. Electric forklift, characterized in that: It comprises the rear-pull type side door hinge assembly of an electric forklift as described in any one of claims 1 to 4.

6. The electric forklift according to claim 5, characterized in that: It also comprises a vehicle body assembly (1) and a side door assembly (2), wherein the side door assembly (2) is movably connected to the vehicle body assembly (1) via a plurality of hinge assemblies (3).

7. The electric forklift according to claim 6, characterized in that: The vehicle body assembly (1) comprises a vehicle frame (103), one end of the vehicle frame (103) being provided with a rear axle (104) and a counterweight (105), and the other end of the vehicle frame (103) being provided with a fender (101) and a locking ring (102).

8. The electric forklift according to claim 7, characterized in that: The side door assembly (2) comprises a side door panel (201), wherein the side door panel (201) is provided with a first guide rail (203), a second guide rail (208), a door lock (204), a plurality of rib plate groups (202) and a plurality of handles (209), wherein both ends of the first guide rail (203) and the second guide rail (208) are provided with a first shaft sleeve (205) and a mounting bracket (206), wherein the first shaft sleeve (205) and the mounting bracket (206) can be adjusted in position along the length direction of the first guide rail (203) / the second guide rail (208), and wherein the mounting bracket (206) is further provided with a bumper (207), wherein the bumper (207) corresponds to the bumper (306) in a one-to-one manner.

9. The electric forklift according to claim 8, characterized in that: The handle (209) is connected to a door lock hook to control the locking and unlocking of the door lock hook and the lock ring (102).

10. The electric forklift according to claim 7, characterized in that: The vehicle frame (103) is also provided with an adjustment window (106) for adjusting the position of the first adjustment bolt (305).

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