CN217780682U

CN217780682U - Chassis and forklift

Info

Publication number: CN217780682U
Application number: CN202221343342.XU
Authority: CN
Inventors: 陈文�
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-11-11
Anticipated expiration: 2032-05-31

Abstract

The utility model relates to a chassis and a forklift, which comprises a suspension system and a driving wheel; the suspension system comprises a first suspension, a second suspension and a third suspension, wherein the first suspension is hinged with the second suspension and the third suspension respectively; the second suspension and the third suspension are hinged with the vehicle body, the fourth suspension and the third suspension form a parallelogram linkage mechanism in an enclosing manner, and the rotation axes of all connecting rods in the parallelogram linkage mechanism are horizontally arranged; the driving wheel is connected with the first suspension and can float up and down along with the first suspension. In the four-bar linkage, two opposite connecting rods are always parallel, and the angular displacement, the angular velocity and the angular acceleration of the two opposite connecting rods are always equal. When the forklift runs on an uneven road surface, the driving wheels can always keep floating up and down in the vertical direction, so that the axes of the driving wheels are always parallel to the road surface, the forklift can be ensured not to incline, and the safety performance of the forklift is improved.

Description

Chassis and forklift

Technical Field

The utility model belongs to the technical field of fork truck safety, a chassis and fork truck is related to.

Background

The forward-moving forklift is mainly suitable for high-position stacking operation in a narrow channel, and the fork of the forward-moving forklift can realize the functions of lifting and descending, forward and backward moving, forward and backward inclining, left and right side moving and the like.

The chassis of the forward forklift mainly comprises a suspension system and a driving wheel, the suspension is connected with the body of the forward forklift, and the driving wheel is connected with the suspension. The driving wheel can float up and down relative to the vehicle body through the suspension system, so that buffering can be realized, and driving experience is improved.

However, the driving wheels are easy to tilt when floating up and down, so that the vehicle body tilts and even turns over laterally, and the safety performance of the forward fork truck is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the chassis and the forklift are provided for solving the problem that a driving wheel of a forward forklift in the prior art is easy to incline when floating up and down and further causes the body to incline or even turn over.

In order to solve the above technical problem, an embodiment of the present invention provides a chassis, for connecting with a vehicle body, including a suspension system and a driving wheel; the suspension system comprises a first suspension, a second suspension and a third suspension, wherein the first suspension is hinged with the second suspension and the third suspension respectively; the second suspension and the third suspension are hinged with the vehicle body, so that the first suspension, the second suspension, the third suspension and the vehicle body enclose to form a parallelogram linkage; wherein the rotation axis of each link in the parallelogram link mechanism is horizontally arranged; the driving wheel is connected with the first suspension and can float up and down along with the first suspension.

Optionally the first suspension comprises a cross plate and a vertical plate; the upper end of the vertical plate is connected with the transverse plate, and the lower end of the vertical plate is hinged with the third suspension; the driving wheel is connected with the transverse plate and is positioned below the transverse plate.

Optionally, the chassis further comprises a buffer device; the buffer device comprises a first mounting seat, a second mounting seat, a first elastic piece and an adjusting screw rod; the first mounting seat is used for being connected with the vehicle body, and the second mounting seat is connected with the first suspension; the first elastic piece is compressed between the first mounting seat and the second mounting seat; one of the first mounting seat and the second mounting seat is provided with a through hole, and the other mounting seat is provided with a second threaded hole; the adjusting screw penetrates through the through hole and is matched with the second threaded hole so as to adjust the compression amount of the first elastic piece.

Optionally, the first elastic member includes a first spring and a second spring; the first spring is sleeved on the outer side of the adjusting screw rod, and the diameter of the second spring is larger than that of the first spring and sleeved on the outer side of the first spring; the first spring and the second spring are both compressed between the first mount and the second mount.

Optionally, the suspension system further comprises a fourth suspension and a second elastic member, and the chassis further comprises a balance wheel; the fourth suspension is hinged to the vehicle body and is horizontally arranged relative to the axis of rotation of the vehicle body; the balance wheel is connected with the fourth suspension; the second elastic member is located above the fourth suspension, the third suspension has a portion located above the second elastic member, and the second elastic member is compressed between the third suspension and the fourth suspension.

Optionally, the chassis further includes a balance wheel limiting device, where the balance wheel limiting device includes a connecting rod, a first limiting member and a second limiting member; a first avoidance hole is formed in the part, above the fourth suspension, of the third suspension, and a second avoidance hole is formed in the fourth suspension; the connecting rod penetrates through the third suspension frame from the first avoidance hole and penetrates through the fourth suspension frame from the second avoidance hole; the first limiting piece and the second limiting piece are both connected with the connecting rod; the first limiting piece is positioned above the third suspension and can be abutted against the third suspension; the second limiting piece is positioned below the fourth suspension and can be abutted against the fourth suspension; and in the direction from top to bottom, the distance between the first limiting part and the second limiting part is adjustable.

Optionally, the chassis further comprises a locking device, and the locking device is respectively connected with the vehicle body and the suspension system and used for unlocking and locking the suspension system; when the locking device unlocks the suspension system, the first suspension can float up and down relative to the vehicle body; when the locking device locks the suspension system, the first suspension and the vehicle body are locked together.

Optionally, the locking device comprises a damping oil cylinder, an electromagnetic valve and an energy accumulator; one of a cylinder body and a piston rod of the damping oil cylinder is connected with the vehicle body, and the other is connected with the first suspension; the electromagnetic valve is respectively connected with the rod cavity and the rodless cavity of the damping oil cylinder and is used for controlling the connection and disconnection of the rod cavity and the rodless cavity; the energy accumulator is connected with the damping oil cylinder, and liquid in the rod cavity and the rodless cavity can flow in an interaction manner with liquid in the energy accumulator.

In order to solve the technical problem, an embodiment of the present invention further provides a forklift, including a forklift body and any one of the above, wherein the chassis has a suspension system connected to the forklift body.

Optionally, the forklift further includes a driving wheel limiting device, and the driving wheel limiting device includes a first base, a first bolt and a first lock nut; the first base is connected with the vehicle body; a first threaded hole is formed in a first one of the first base and the first suspension, and the first bolt is matched with the first threaded hole so as to adjust the distance between a second one of the first base and the first suspension; the first locking nut is matched with the first bolt and used for locking the first bolt on the first bolt; when the first suspension floats downwards, the first bolt can interfere with the second suspension.

Optionally, the forklift is a reach truck.

The embodiment of the utility model provides an among chassis and fork truck, suspension system and automobile body enclose to close and form a parallelogram link mechanism, and among this four-bar linkage, two relative connecting rods remain parallel throughout, and the angular displacement, angular velocity and the angular acceleration of two relative connecting rods also equal throughout. When the forklift runs on an uneven road surface, the driving wheels can always keep floating up and down in the vertical direction, so that the axes of the driving wheels are always parallel to the road surface, the vehicle body can be ensured not to incline, and the safety performance of the forklift is improved.

Drawings

Fig. 1 is a schematic structural view of a forklift according to an embodiment of the present invention;

fig. 2 is a schematic view of a chassis of a forklift according to an embodiment of the present invention;

fig. 3 is a first schematic structural diagram of a chassis of a forklift truck according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram ii of a chassis of a forklift according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a locking device of a forklift according to an embodiment of the present invention;

fig. 6 is a first structural schematic view of a cushioning device of a forklift according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a driving wheel limiting device of a forklift according to an embodiment of the present invention.

The reference numerals in the specification are as follows:

100. a forklift; 10. a vehicle body; 20. a chassis; 30. a driving wheel limiting device;

1. a suspension system; 11. a first suspension; 12. a second suspension; 13. a third suspension; 14. a fourth suspension; 15. a second elastic member;

2. a drive wheel;

31. a first shaft; 32. a second shaft; 33. a third axis; 34. a fourth axis;

4. a locking device; 41. a damping oil cylinder; 411. a cylinder body; 412. a piston rod; 42. an electromagnetic valve; 43. a screw; 44. an accumulator;

5. a buffer device; 51. a first mounting seat; 52. a second mounting seat; 53. a first elastic member; 531. a first spring; 532. a second spring; 54. adjusting the screw rod; 55. fixing a nut; 56. a stopper;

6. a balance wheel;

7. a balance wheel limiting device; 71. a connecting rod; 72. a first limit piece; 73. a second limiting member;

301. a first base; 302. a first bolt; 303. a first lock nut.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

As shown in fig. 1 and 2, in an embodiment, the forklift 100 is a reach forklift, and includes a body 10 and a chassis 20, the chassis 20 includes a suspension system 1 and a driving wheel 2, the suspension system 1 is connected to the body 10, and the driving wheel 2 is connected to the suspension system 1. Wherein, suspension system 1 is used for providing the buffering, makes drive wheel 2 can fluctuate, and then improves fork truck 100's driving experience.

As shown in fig. 2 to 4, in an embodiment, the suspension system 1 includes a first suspension 11, a second suspension 12, and a third suspension 13, the first suspension 11 being hinged to the second suspension 12 and the third suspension 13, respectively; the second suspension 12 and the third suspension 13 are hinged with the vehicle body 10, and the first suspension 11, the second suspension 12, the third suspension 13 and the vehicle body 10 enclose to form a parallelogram linkage; wherein, the rotation axes of all the connecting rods in the parallelogram connecting rod mechanism are horizontally arranged, so that the first suspension 11 can float up and down relative to the vehicle body 10; the drive wheel 2 is connected to the first suspension 11 and can float up and down together with the first suspension 11. In fig. 2, the dot-dash line shows the position of the drive wheel 2 after floating downward.

In the present embodiment, each of the first suspension 11, the second suspension 12, the third suspension 13, and the vehicle body 10 corresponds to a link, and the link corresponding to the first suspension 11 is parallel to and opposite to the link corresponding to the vehicle body 10, and the link corresponding to the second suspension 12 is parallel to and opposite to the link corresponding to the third suspension 13. The rotation axes of the links are the axis about which the first suspension 11 rotates with respect to the second suspension 12, the axis about which the second suspension 12 rotates with respect to the vehicle body 10, the axis about which the third suspension 13 rotates with respect to the vehicle body 10, and the axis about which the first suspension 11 rotates with respect to the third suspension 13.

When the connecting rod mechanism works, the two opposite connecting rods are always kept parallel, and the angular displacement, the angular velocity and the angular acceleration of the two opposite connecting rods are also always equal. When the forklift 100 runs on an uneven road surface, the driving wheel 2 can always keep floating up and down in the vertical direction, so that the axis of the driving wheel 2 always keeps parallel to the road surface, the forklift body 10 can be ensured not to incline, and the safety performance of the forklift 100 is improved.

In addition, in the present embodiment, each suspension in the suspension system 1 is provided by a cast or forged structure, and this arrangement can reduce the cost as compared with the arrangement using a welded structure.

As shown in fig. 2 and 3, in one embodiment, the chassis 20 further includes a first shaft 31, a second shaft 32, a third shaft 33, and a fourth shaft 34; the first suspension 11 and the second suspension 12 are in rotational connection through a first shaft 31, the second suspension 12 and the vehicle body 10 are in rotational connection through a second shaft 32, the third suspension 13 and the vehicle body 10 are in rotational connection through a third shaft 33, and the first suspension 11 and the third suspension 13 are in rotational connection through a fourth shaft 34.

In one embodiment, the first shaft 31 and the fourth shaft 34 are both fixed to the first suspension 11, the second shaft 32 and the third shaft 33 are both fixed to the vehicle body 10, and at this time, the second suspension 12 is rotationally connected to the first shaft 31, the second suspension 12 is also rotationally connected to the second shaft 32, the third suspension 13 is rotationally connected to the third shaft 33, and the third suspension 13 is also rotationally connected to the fourth shaft 34. Of course, in other embodiments, the first shaft 31 and the fourth shaft 34 may be both rotatably connected to the first suspension 11, and the second shaft 32 and the third shaft 33 may be both rotatably connected to the vehicle body 10, in this case, the second suspension 12 may be rotatably connected or fixedly connected to the first shaft 31, the second suspension 12 may be rotatably connected or fixedly connected to the second shaft 32, the third suspension 13 may be rotatably connected or fixedly connected to the third shaft 33, and the third suspension 13 may be rotatably connected or fixedly connected to the fourth shaft 34.

As shown in fig. 3 and 4, in an embodiment, the first suspension 11 includes a horizontal plate 111 and a vertical plate 112, and an upper end of the vertical plate 112 is connected to the horizontal plate 111, so that the first suspension 11 is formed into an L-shaped structure as a whole. After assembly, the transverse plate 111 is hinged with the second suspension 12, and the lower end of the vertical plate 112 is hinged with the third suspension 13. In addition, the transverse plate 111 may be horizontally disposed, and the driving wheel 2 is mounted on the transverse plate 111 and below the transverse plate 111. In addition, the connection manner of the driving wheel 2 and the suspension system 1 may be the prior art, and the embodiment is not limited herein. It should be understood that in other embodiments, the second suspension 12 can be hinged to the riser 112.

As shown in fig. 2 to 4, in an embodiment, the chassis 20 further includes a locking device 4 connected to the vehicle body 10 and the suspension system 1, respectively, for unlocking and locking the suspension system 1; when the suspension system 1 is unlocked, the first suspension 11 can float up and down relative to the vehicle body 10; when the suspension system 1 is locked, the first suspension 11 is locked with the vehicle body 10. During normal driving, the suspension system 1 can be unlocked to improve the driving comfort; when the forklift 100 performs hydraulic action such as high-position stacking or high-speed turning, the suspension system 1 can be locked through the locking device 4, so that the chassis 20 is rigidly connected with the body 10, the shaking and the inclination of the whole forklift can be reduced, the stability and the safety of the whole forklift are improved, and the safety operation of a driver can be protected to a greater extent. The hydraulic operation of the forklift 100 mainly refers to the operation of the fork of the forklift 100, and the operation of the fork mainly includes lifting, descending, forward and backward movement, tilting operation, and the like.

In addition, the forklift 100 further includes a controller, an angle sensing switch and a steering encoder, wherein the controller can detect the turning angle of the driving wheel 2 in real time through the angle sensing switch and the steering encoder, and meanwhile, the controller also detects the running speed of the forklift 100 in real time by detecting the rotating speed of a driving motor (the motor is used for driving the driving wheel 2 to rotate).

As shown in fig. 5, in one embodiment, the locking device 4 includes a damping cylinder 41 and a solenoid valve 42. The cylinder 411 of the damping cylinder 41 is connected to the vehicle body 10, and the piston rod 412 of the damping cylinder 41 is connected to the first suspension 11. The electromagnetic valve 42 is connected to the rod chamber and the rodless chamber of the damping cylinder 41, specifically, the electromagnetic valve 42 is connected to the rod chamber and the rodless chamber through the corresponding oil pipe, and the connection and disconnection of the rod chamber and the rodless chamber can be controlled by the electromagnetic valve 42. When the rod chamber and the rodless chamber are communicated, the suspension system 1 is in an unlocked state, and when the first suspension 11 floats up and down, the piston rod 412 moves along with the rod chamber; when the rod chamber and the rodless chamber are disconnected, the suspension system 1 is in a locked state in which the first suspension 11 does not float up and down.

In the present embodiment, the cylinder 411 and the vehicle body 10 may be rotatably connected, the piston rod 412 is rotatably connected with the first suspension 11, and the axis of rotation of the cylinder 411 relative to the vehicle body 10 is parallel to the axis of rotation of the piston rod 412 relative to the first suspension 11. In addition, it should be understood that the maximum distance that the driving wheel 2 can float up and down is also limited to a certain extent by the damping cylinder 41. In other embodiments, the damping cylinder 41 may be mounted in the following manner: the cylinder 411 is connected to the first suspension 11, and the piston rod 412 is connected to the vehicle body 10. As shown in fig. 5, the solenoid valve 42 may be fixed to the cylinder 411 by screws 43 or the like.

As shown in fig. 5, in an embodiment, the locking device 4 further comprises an accumulator 44, the accumulator 44 is connected to the damping cylinder 41, and the fluid in both the rod chamber and the rodless chamber is capable of alternating with the fluid in the accumulator 44. When the forklift normally runs, the electromagnetic valve is not attracted, and the rod cavity and the rodless cavity of the damping oil cylinder 41 are communicated at the moment, so that the impact from the road surface can be absorbed through the energy accumulator 44, the buffering and damping effects are achieved, and the comfort of a driver is improved.

As shown in fig. 2 and 3, in one embodiment, the chassis 20 further includes a cushioning device 5. The pre-pressure of the driving wheel 2 can be adjusted according to the using working condition and the load of the forklift 100 through the buffer device 5, and the phenomenon that the driving wheel 2 slips is avoided in the running process of the forklift 100.

Specifically, as shown in fig. 6, the buffering device 5 includes a first mounting seat 51, a second mounting seat 52, a first elastic member 53, and an adjusting screw 54; the first mounting base 51 is connected with the vehicle body 10, and the second mounting base 52 is connected with the first suspension 11; the first elastic member 53 is compressed between the first mount 51 and the second mount 52; a through hole is arranged on the first mounting seat 51, and a second threaded hole is arranged on the second mounting seat 52; the adjusting screw 54 passes through the through hole and is engaged with the second threaded hole to adjust the compression amount of the first elastic member 53, thereby adjusting the pre-pressure to the driving wheel 2.

After assembly, the damper device 5 damps the shock between the vehicle body 10 and the drive wheel 2, and the first elastic member 53 presses the vehicle body 10 up and presses the first suspension 11 down after being compressively deformed. The adjusting screw 54 abuts against the first mounting seat 51, and the preload of the first elastic member 53 on the driving wheel 2 can be adjusted by screwing the adjusting screw 54.

In addition, as shown in fig. 6, the buffer device 5 further includes a fixing nut 55, and the fixing nut 55 cooperates with the adjusting screw to lock the adjusting screw 54 and the first mounting seat 51 together. In addition, the buffering device 5 further includes a stopper 56, the stopper 56 is disposed between the first mounting seat 51 and the first elastic member 53 and respectively abutted against the first mounting seat and the first elastic member, the stopper 56 is provided with an avoiding hole, and the adjusting screw 54 penetrates through the stopper 56 from the avoiding hole.

In the present embodiment, the first mounting seat 51 may be fixedly mounted on the vehicle body 10 by welding or the like, and may be an integral structure with the vehicle body 10; the second mounting seat 52 may be fixed to the first suspension 11 by welding or the like, and may be an integral structure with the first suspension 11. In another embodiment, a screw hole may be provided in the first mounting seat 51, and a through hole may be provided in the second mounting seat 52.

As shown in fig. 6, in one embodiment, the first elastic member 53 includes a first spring 531 and a second spring 532, both of which are solenoid springs. The first spring 531 is sleeved outside the adjusting screw 54, and the diameter of the second spring 532 is larger than that of the first spring 531 and sleeved outside the first spring 531; the first and second springs 531 and 631 are each compressed between the first and

second mounts

51 and 52. With the arrangement, the first elastic member 53 can be conveniently produced and manufactured on the premise of ensuring the rigidity of the first elastic member 53, and the cost of the first elastic member 53 can be reduced.

As shown in fig. 2 and 4, in an embodiment, the suspension system 1 further includes a fourth suspension 14 and a second elastic member 15, and the chassis 20 further includes a balance wheel 6; the fourth suspension 14 is hinged to the vehicle body 10, and the fourth suspension 14 is horizontally arranged relative to the axis of rotation of the vehicle body 10; the balance wheel 6 is connected with the fourth suspension 14 and can float up and down along with the fourth suspension 14; the second elastic member 15 is located above the fourth suspension 14, the third suspension 13 has a portion located above the second elastic member 15, and the second elastic member 15 is compressed between the third suspension 13 and the fourth suspension 14. In this embodiment, can restrict the biggest floating distance of stabilizer 6 through third suspension 13, simultaneously through the setting of second elastic component 15 for fourth suspension 14 and stabilizer 6 receive the pressure of third suspension 13 all the time, and then guarantee stabilizer 6 and ground contact, stability when improvement fork truck 100 traveles. Meanwhile, rigid collision between the third suspension 13 and the fourth suspension 14 can be avoided through the arrangement of the second elastic piece 15, and the working performance of the forklift 100 is improved. In addition, the fourth suspension 14 is also articulated on the third axle 33, in order to reduce costs. In addition, the connection manner of the balance wheel 6 and the suspension system 1 may be the prior art, and the embodiment is not limited herein.

As shown in fig. 3 and 4, in an embodiment, the chassis further includes a balance wheel limiting device 7, and the balance wheel limiting device 7 includes a connecting rod 71, a first limiting member 72, and a second limiting member 73; in addition, a first avoiding hole is formed in a part, above the fourth suspension 14, of the third suspension 13, and a second avoiding hole is formed in the fourth suspension 14. The connecting rod 71 passes through the third suspension 13 from the first avoidance hole and passes through the fourth suspension 14 from the second avoidance hole; the first limiting member 72 and the second limiting member 73 are both connected to the connecting rod 71, wherein the first limiting member 72 is located above the third suspension 13, the second limiting member 73 is located below the fourth suspension 14, the first limiting member 72 can abut against the third suspension 13, and the second limiting member 73 can abut against the fourth suspension 14.

That is, the third suspension 13 and the fourth suspension 14 are limited between the first limiting member 72 and the second limiting member 73, and the maximum floating distance between the third suspension 13 and the fourth suspension 14 can be limited by the first limiting member 72 and the second limiting member 73. Through the appropriate setting of the vertical distance between the first limiting member 72 and the second limiting member 73, the second elastic member 15 can be prevented from falling off due to the overlarge distance between the third suspension 13 and the fourth suspension 14.

In addition, in the top-down direction, the distance between the first limiting member 72 and the second limiting member 73 is adjustable, so that the maximum floating distance between the third suspension 13 and the fourth suspension 14 can be adjusted as required. At this time, the connecting rod 71 may be a stud of a bolt, the first limiting member 72 is a head of the bolt, and the second limiting member 73 includes two nuts, both of which are engaged with the stud, so that when the two nuts abut against each other, the two nuts can be fixed on the stud.

As shown in fig. 1, in an embodiment, the forklift 100 further includes a driving wheel stopper 30, and the driving wheel stopper 30 is connected to the body 10 to limit a maximum distance of the driving wheel 2 floating downward, so that stability and reliability of the chassis 20 can be improved.

As shown in fig. 2 and 3, in one embodiment, the driving wheel restraining device 30 includes a first base 301, a first bolt 302, and a first lock nut 303. The first base 301 is connected to the vehicle body 10, wherein the first base 301 may be fixedly mounted on the vehicle body 10 by welding or the like, and meanwhile, the first base 301 and the vehicle body 10 may be an integral structure. The first suspension 11 is provided with a first screw hole that extends from the upper surface of the first suspension 11 to the lower surface of the first suspension 11. The first bolt 302 is fitted with the first threaded hole, and the lower end of the first bolt 302 passes through the first suspension 11 from the first threaded hole to protrude out of the lower surface of the first suspension 11. Meanwhile, the lower end of the first bolt 302 is located above the first base 301, and when the first suspension floats downward, the first bolt can abut against the first base 301. The first lock nut 303 is engaged with the first bolt 302 to lock the first bolt 302 to the first suspension 11. In addition, a first lock nut 303 is provided above the first suspension to facilitate adjustment thereof.

In the present embodiment, when the first suspension 11 floats downward until the first bolt 302 abuts against the first base 301, the first suspension 11 floats downward to the maximum position. Through the cooperation of the first bolt 302 and the first threaded hole, the distance between the first bolt 302 and the first base 301 can be adjusted, and thus the maximum distance that the first suspension 11 floats downward can be adjusted.

In addition, in other embodiments, the first threaded hole may also be a blind hole, and in this case, the first threaded hole is disposed on the lower surface of the first suspension 11. In addition, as shown in fig. 7, in this embodiment, the first threaded hole may be disposed on the first base 301, and after the first bolt 302 is engaged with the first threaded hole, the first bolt 302 is located below the first suspension 11, and when the first suspension 11 floats downward to the maximum position, the first suspension 11 interferes with the first bolt 302; at this time, by the cooperation of the first bolt 302 and the first threaded hole, the distance between the first bolt 302 and the first suspension 11 can be adjusted, and thus the maximum distance that the first suspension 11 floats downward can be adjusted.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A chassis is used for being connected with a vehicle body and is characterized by comprising a suspension system and a driving wheel;

the suspension system comprises a first suspension, a second suspension and a third suspension, wherein the first suspension is hinged with the second suspension and the third suspension respectively; the second suspension and the third suspension are hinged with the vehicle body, so that the first suspension, the second suspension, the third suspension and the vehicle body are enclosed to form a parallelogram linkage;

wherein the rotation axis of each link in the parallelogram linkage mechanism is horizontally arranged;

the driving wheel is connected with the first suspension and can float up and down along with the first suspension.

2. The chassis of claim 1, wherein the first suspension includes a cross plate and a riser;

the upper end of the vertical plate is connected with the transverse plate, and the lower end of the vertical plate is hinged with the third suspension;

the driving wheel is connected with the transverse plate and is positioned below the transverse plate.

3. The chassis of claim 1, further comprising a cushioning device; the buffer device comprises a first mounting seat, a second mounting seat, a first elastic piece and an adjusting screw rod;

the first mounting seat is used for being connected with the vehicle body, and the second mounting seat is connected with the first suspension;

the first elastic piece is compressed between the first mounting seat and the second mounting seat;

one of the first mounting seat and the second mounting seat is provided with a through hole, and the other mounting seat is provided with a second threaded hole;

the adjusting screw penetrates through the through hole and is matched with the second threaded hole so as to adjust the compression amount of the first elastic piece.

4. The chassis of claim 3, wherein the first resilient member comprises a first spring and a second spring;

the first spring is sleeved on the outer side of the adjusting screw rod, and the diameter of the second spring is larger than that of the first spring and sleeved on the outer side of the first spring;

the first spring and the second spring are both compressed between the first mount and the second mount.

5. The chassis of claim 1, wherein the suspension system further comprises a fourth suspension and a second spring, the chassis further comprising a balance wheel;

the fourth suspension is hinged to the vehicle body and is horizontally arranged relative to the axis of rotation of the vehicle body;

the balance wheel is connected with the fourth suspension;

the second elastic member is located above the fourth suspension, the third suspension has a portion located above the second elastic member, and the second elastic member is compressed between the third suspension and the fourth suspension.

6. The chassis of claim 5, further comprising a balance wheel limiting device comprising a connecting rod, a first limiting member, and a second limiting member;

a first avoidance hole is formed in the part, above the fourth suspension, of the third suspension, and a second avoidance hole is formed in the fourth suspension;

the connecting rod penetrates through the third suspension frame from the first avoidance hole and penetrates through the fourth suspension frame from the second avoidance hole;

the first limiting piece and the second limiting piece are both connected with the connecting rod; the first limiting part is positioned above the third suspension and can be abutted against the third suspension; the second limiting piece is positioned below the fourth suspension and can be abutted against the fourth suspension; and in the direction from top to bottom, the distance between the first limiting part and the second limiting part is adjustable.

7. The chassis of claim 1, further comprising a latch device coupled to the body and the suspension system for unlocking and locking the suspension system, respectively;

when the locking device unlocks the suspension system, the first suspension can float up and down relative to the vehicle body;

when the locking device locks the suspension system, the first suspension and the vehicle body are locked together.

8. The chassis of claim 7, wherein the locking device comprises a damping cylinder and solenoid valve and an accumulator;

one of a cylinder body and a piston rod of the damping oil cylinder is connected with the vehicle body, and the other is connected with the first suspension;

the electromagnetic valve is respectively connected with the rod cavity and the rodless cavity of the damping oil cylinder and is used for controlling the connection and disconnection of the rod cavity and the rodless cavity;

the energy accumulator is connected with the damping oil cylinder, and liquid in the rod cavity and the rodless cavity can flow in an interaction manner with liquid in the energy accumulator.

9. A forklift comprising a body and a chassis according to any one of claims 1 to 8, the suspension system of the chassis being connected to the body.

10. The lift truck of claim 9, further comprising a drive wheel stop comprising a first base, a first bolt, and a first lock nut;

the first base is connected with the vehicle body;

a first threaded hole is formed in a first one of the first base and the first suspension, and the first bolt is matched with the first threaded hole so as to adjust the distance between a second one of the first base and the first suspension;

the first locking nut is matched with the first bolt and used for locking the first bolt on the first bolt;

when the first suspension floats downwards, the first bolt can interfere with the second suspension.

11. The lift truck of claim 9, wherein the lift truck is a reach truck.