TWI820664B - Truck tailgate system with flip-up tailgate ejection device - Google Patents

Abstract

The invention includes a first plate member, a second plate member, a first elastic member and a tailgate flip driving member. The first and second panels are each pivoted at one end to a truck body. The first plate member has a resisting notch; the first elastic member is pivotally connected between the first plate member and the second plate member for tightening the first plate member and the second plate member; the tailgate The flip driving component is pivotally disposed between the truck body and the second plate component. When the tailgate flip driving member is started, the second plate is pushed, and the second plate pushes the first plate to move, and the resisting notch is used to generate a resisting force. This case has the advantages of preventing damage to the electric cylinder when the tailgate is lowered and flipped, the structure of the electric cylinder and linkage rod assembly to control the flip is simple and low-cost, and it has a protective mechanism that reduces the chance of damage to the mechanism due to extrusion.

Description

Truck tailgate system with flip-up tailgate ejection device

The present invention relates to a truck tailgate system with an ejection device for flipping the tailgate. In particular, it refers to a truck tailgate system that can prevent damage to the electric cylinder when the tailgate is lowered and flipped, has a simple structure and low cost to control the flipping of the electric cylinder and linking rod assembly, and A truck tailgate system with an ejection device for a flip tailgate that has a protection mechanism to reduce the chance of the mechanism being squeezed and damaged.

Known control devices for lifting and flipping truck tailgates include at least the following two types:

[1] Hydraulic cylinder drive design: For example, Taiwan’s new patents No. M426533 and M301159.

The shortcomings of the two aforementioned cases are as follows:

1. When the single hydraulic cylinder tailgate mechanism is turned over, the cam pair needs to be manually controlled, which is troublesome to operate.

2. The cost of using dual hydraulic cylinders or four hydraulic cylinders is higher.

[2] Automatic locking and lifting design: For example, Taiwan New Patent No. M253513.

The shortcomings of the aforementioned publicly known cases are:

1. When the tailgate is turned down, the hydraulic cylinder and the electric cylinder are driven at the same time. At this time, the current of the electric cylinder will continue to rise, causing burnout.

2. Failure to turn it over in the proper position may cause damage to the mechanism.

In view of this, it is necessary to develop technology that can solve the above conventional shortcomings.

The purpose of the present invention is to provide a truck tailgate system with an ejection device for flipping the tailgate, which can prevent damage to the electric cylinder when the tailgate is lowered and flipped, and has a simple structure and low cost to control the flipping of the electric cylinder and linking rod assembly. And it has the advantages of protecting the mechanism and reducing the chance of damage due to extrusion. In particular, the problem to be solved by the present invention is that if the tailgate of a conventional truck is flipped with a single hydraulic cylinder tailgate mechanism, The cam pair needs to be controlled manually, which is troublesome to operate; if double hydraulic cylinders or four hydraulic cylinders are used, the cost will be higher. If it is designed to automatically lock and lift, when the tailgate is turned down, the hydraulic cylinder and the electric cylinder are driven at the same time. At this time, the current of the electric cylinder will continue to rise, which may cause burnout, and if it is not turned over in the appropriate position, it may easily cause damage to the mechanism. etc. questions.

The technical means to solve the above problems is to provide a truck tailgate system with a push-up device for a flip-up tailgate. The push-out device for the flip-up tailgate includes: a first plate for pivoting on a truck. The truck body at least includes a frame; the first plate member has a resisting recess, a first pivot point of the first plate member and a second connection point of the first plate member; the resisting recess The opening and the first pivot point of the first plate are respectively located at both ends of the first plate. The first pivot point of the first plate is for the first plate to be pivoted on the frame. The first The second connection point of the panel is located between the resisting notch and the first pivot point of the first panel; a second panel is pivotally installed on the frame, and the second panel has a first There are a first pivot point of the two plates, a second connection point of the second plate and a third pivot point of the second plate. The first pivot point of the second plate is for the second plate to be pivoted on. The frame; a first elastic member is pivoted between the second connection point of the first plate member and the second connection point of the second plate member for tightening the first plate member and the second plate member. The plate parts are in contact; and a tailgate flip driving member is pivotally mounted on the vehicle frame. The tailgate flip driving member has a cylinder and a telescopic rod; the telescopic rod can telescope relative to the cylinder, and, The cylinder system is used for the tailgate flipping driving member to be pivoted on the frame, and the telescopic rod is used for the tailgate flipping driving member to be pivoted on the third pivot point of the second plate; thereby, when the tailgate is started, The door flip driving member, the telescopic rod extends out of the cylinder to push the second plate member, the second plate member pushes the first plate member to move, and the resisting notch is used to generate a resisting force.

The truck tailgate system with an ejection device for a flip-up tailgate includes: an ejection device for a flip-up tailgate as defined in any one of claims 1 to 3; A lifting driving element is installed on the frame and has a lifting cylinder and a lifting telescopic rod. The lifting cylinder system is used for the lifting driving element to be pivoted on the frame. The lifting telescopic rod is connected to the lifting cylinder. , and has at least an extended position and a retracted position; the truck body also includes a tailgate, and the frame has a lifting pivot portion, a connecting rod pivot portion and a resisting portion; the lifting cylinder The system is pivoted on the lifting pivot joint; a parallel four-link assembly is pivoted on the frame; the parallel four-link assembly has a first rod, a second rod, a third rod, and a third rod. Four rods, a first pivot point, a second pivot point, a fourth pivot point and a fourth pivot point; the first rod system has a lifting pivot portion, and the lifting telescopic rod system provides The lifting driving element is pivotally mounted on the lifting pivot portion; the first rod is parallel to the third rod, and the third rod has a linking pivot portion, and the second rod is parallel to the fourth rod; A pivot point is pivotally connected to the first rod and the second rod, and the first pivot point is for the parallel four-link assembly to be pivoted on the connecting rod pivot portion; the second pivot point is a pivot point The second rod and the third rod are connected, and the second pivot point is used for the parallel four-link assembly to perform one of the actions of abutting the resisting portion and leaving the resisting portion; the third pivot point is The third pole and the fourth pole are pivotally connected; the tailgate is integrally extended from at least one of the third pole and the fourth pole; the fourth pivot point is pivotally connected to the fourth pole and the fourth pole. The first rod; and a linkage rod assembly, which is pivoted between the linkage pivot part and the linkage pivot part. The linkage rod assembly has a first linkage, a second linkage and a linkage pivot. Contact point; the linkage pivot point is used to pivot the first link and the second link, and the first link and the second link are respectively used for the linkage assembly to be pivoted on the linkage pivot. The pivotal joint between the connecting rod and the connecting rod.

Thereby, the truck tailgate can perform the following two actions: [a] Horizontal lifting: the telescopic rod of the tailgate flip driving member contracts, and the lifting telescopic rod is in the extended position, then the tailgate is in the downward position. position, and then control the lifting telescopic rod to retract from the descending position to the retracted position. In the process, the parallel four-link assembly is pulled up through the lifting pivot portion, and the second pivot joint The point allows the parallel four-link assembly to abut the frame, and then the parallel four-link assembly deforms and pulls the tailgate from the lowered position to the raised position; [b] flipping during lifting: flipping up: the tailgate The telescopic rod of the door flip driving member is contracted, and the lifting telescopic rod is in the extended position, and the tailgate is in the lowered position. Then, the tailgate flip driving member is started first, and the telescopic rod extends and passes through the second plate. The component pushes the first plate member to move downward until the resisting notch is at a resisting position; and in the process of controlling the lifting telescopic rod to change from the extended position to the retracted position, the tailgate starts to rise in conjunction with the , the ascent is divided into two stages. The first stage is from the descending position to a conversion position. This stage is purely ascending without turning over until the linkage pivot point of the linkage rod assembly abuts the abutment notch. When the tailgate is in the switching position, the second pivot point begins to leave the abutment portion, and the parallel four-link assembly deforms and begins to flip the tailgate until the tailgate is in the flipping position; descending flip: this The action is divided into the following two stages; the first stage is from the flipping position to the switching position. This first stage is the turning and descending action. When the tailgate is in the flipping position, the expansion and contraction of the tailgate turning driving member is first controlled. When the rod is retracted, the first elastic member is pulled open, which can prevent the tailgate flipping driving member from bearing pressure, causing the current value of the load of the tailgate flipping driving member to become higher and higher, resulting in burning; and then controlling the lift. During the reverse process of the telescopic rod returning from the retracted position to the extended position, since the linkage pivot point of the linkage rod assembly remains against the resisting notch, the parallel four-link assembly is deformed in turn. Until the tailgate moves back to the ascending position; the second stage is to reset from the conversion position to the descending position. This stage is a pure descent without turning over; the linkage pivot point of the linkage rod assembly begins to retreat from the The first plate is no longer stuck and can be pulled up and reset by the first elastic member, and finally the second pivot point is The abutment portion is contacted, and the tailgate moves back to the lowered position, completing the lowering and flipping.

The above objects and advantages of the present invention can be easily understood from the following detailed description of selected embodiments and the accompanying drawings.

The present invention is described in detail below with the following examples and drawings:

10:The first plate

11: Press against the notch

20:Second plate

30: First elastic member

40: Tailgate flip driver

41:Cylinder block

42: Telescopic rod

50A: Boom

50B: Second elastic member

60: Lifting drive components

61: Lifting cylinder

62: Lifting telescopic rod

70: Parallel four-link assembly

71:First shot

711:Lifting pivot joint

72:Second shot

73:Third shot

731: Linkage pivot joint

74:The fourth shot

75:First pivot point

76: Second pivot point

77: The third pivot point

78: The fourth pivot point

80: Linking rod assembly

81:First connecting rod

82:Second connecting rod

83: Linkage pivot point

90: Truck body

91: Frame

91A:Restricted Department

91B:Lifting pivot joint

91C: Connecting rod pivot joint

91D:Butt part

92:Tailgate

M1: The first pivot point of the first plate

M2: The second connection point of the first plate

M3: The first pivot point of the second plate

M4: The second connection point of the second plate

M5: The third pivot point of the second plate

M6: Boom connection point

P1: Extended position

P2: indent position

PA1: Descending position

PA2: ascending position

PR: pressing position

PB1: Switch position

PB2: flip position

Figure 1A is a schematic diagram of the first embodiment of the present invention.

Figure 1B is a schematic diagram of the second embodiment of the present invention.

Figure 1C is an enlarged schematic diagram of part of the structural movement of Figure 1B

Figure 1D is a schematic diagram of the third embodiment of the present invention.

Figure 1E is an enlarged schematic diagram of part of the structural movement of Figure 1D

Figure 2 is a partially exploded schematic diagram of the present invention applied to the tailgate of a truck.

Figure 3 is a schematic diagram of the present invention applied to the tailgate of a truck.

Figures 4A and 4B are schematic diagrams of the descending position and the ascending position respectively when the present invention is applied to the tailgate of a truck.

Figures 4C and 4D are schematic diagrams of the linkage mechanism in Figures 4A and 4B respectively.

Figures 5A and 5B are schematic diagrams of the switching position and (rising) flipping position respectively when the present invention is applied to the tailgate of a truck.

Figures 5C and 5D are schematic diagrams of the linkage mechanism in Figures 5A and 5B respectively.

Figures 6A and 6B are respectively schematic diagrams of the electric cylinder retraction and tailgate (lowering) flip positions when the present invention is applied to the truck tailgate.

Figures 6C and 6D are schematic diagrams of the linkage mechanism in Figures 6A and 6B respectively.

Figure 6E is an enlarged schematic diagram of Figure 6D where the linkage pivot point retreats from the resisting notch and the first plate can be pulled back to its original position.

Referring to Figure 1A, the present invention is a truck tailgate system with a push-up device for a flip-up tailgate. The push-up device for the flip-up tailgate includes: a first plate 10 for pivoting on A truck body 90 includes at least a frame 91 . The first plate 10 has a resisting notch 11 , a first pivot point M1 of the first plate and a second connection point M2 of the first plate. The resisting notch 11 and the first plate The first pivot points M1 are respectively located at both ends of the first plate member 10. The first pivot points M1 of the first plate member are for the first plate member 10 to be pivoted on the vehicle frame 91. The first plate member The second connection point M2 is located between the resisting notch 11 and the first pivot point M1 of the first plate member.

A second plate member 20 is pivotally mounted on the vehicle frame 91. The second plate member 20 has a second plate member first pivot point M3, a second plate member second connection point M4 and a second second plate member 20. The third pivot point M5 of the plate member, and the first pivot point M3 of the second plate member are for the second plate member 20 to be pivoted on the frame 91 .

A first elastic member 30 is pivotally provided between the second connection point M2 of the first plate member and the second connection point M4 of the second plate member, for tightening the first plate member 10 and the second plate member 10 . The plates 20 are in contact.

A tailgate flipping driving member 40 is pivotally mounted on the vehicle frame 91 . The tailgate flipping driving member 40 has a cylinder 41 and a telescopic rod 42 . The telescopic rod 42 is telescopic relative to the cylinder 41. In addition, the cylinder 41 is used for the tailgate flip driving member 40 to be pivoted on the vehicle frame 91, and the telescopic rod 42 is used for the tailgate flip driving member. 40 is pivoted at the third pivot point M5 of the second plate.

Thereby, when the tailgate flip driving member 40 is activated, the telescopic rod 42 extends out of the cylinder 41 to push the second plate 20, and the second plate 20 pushes the first plate 10 to move, and the second plate 20 pushes the first plate 10 to move. The resisting notch 11 is used to generate a resisting force (refer to Figures 5C and 5D).

In practice, refer to Figures 1B and 1C, which is the second embodiment of the present case. The only difference from the first embodiment is that it may further include: a suspension rod 50A, which is pivoted between the cylinder 41 and the cylinder 41. between the vehicle frames 91; and the vehicle frame 91 may further include a limiting portion 91A, which extends laterally from the vehicle frame 91 and blocks the pivoting position of the hanger 50A. Below the position of the vehicle frame 91, the hanger 50A can only rotate upward relative to the vehicle frame 91, but cannot rotate downward, forming a safe support structure.

A second elastic member 50B is pivotally connected between the cylinder 41 and the frame 91 so that the cylinder 41, the suspension rod 50A, the second elastic member 50B and the frame 91 are approximately in a triangular distribution shape. .

Thereby, when the first plate member 10 , the second plate member 20 and the tailgate flip driving member 40 are squeezed, the tailgate flip driving member 40 can buffer the squeeze through the second elastic member 50B. force to reduce the chance of crushing damage.

In addition, as shown in Figures 1D and 1E, it is the third embodiment of the present case. The only difference from the first embodiment is that it also includes: the suspension rod 50A is pivoted between the cylinder 41 and the vehicle. Between the frames 91, the boom 50A has a boom connection point M6. The frame 91 may further include a restricting portion 91A, which extends laterally from the frame 91 and blocks below the position where the hanger 50A is pivoted on the frame 91, so that the hanger 50A can only rotate upward relative to the frame 91 and cannot rotate downward, forming a safe support structure.

The first elastic member 30 is pivotally connected between the second connection point M2 of the first plate member and the suspension rod connection point M6.

Thereby, when the first plate member 10 , the second plate member 20 and the tailgate flip driving member 40 are squeezed, the tailgate flip driving member 40 can buffer the squeeze through the first elastic member 30 force to reduce the chance of crushing damage.

The tailgate flip driving member 40 may be an electric cylinder.

Referring to Figures 2, 3, 4A, 4B, 4C and 4D, when the present invention is applied to the tailgate of a truck, it can further include: a lifting drive element 60, which is installed on the frame 91 and has A lifting cylinder 61 and a lifting telescopic rod 62. The lifting cylinder 61 is used for the lifting driving element 60 to be pivoted on the frame 91. The lifting telescopic rod 62 is connected to the lifting cylinder 61 and has at least one protrusion. Position P1 and a retracted position P2. The truck The body 90 further includes a tailgate 92, and the frame 91 has a lifting pivot portion 91B, a connecting rod pivot portion 91C and a resisting portion 91D; the lifting cylinder 61 is pivotally mounted on the lifting pivot portion. The connecting portion 91B (the part that needs special explanation here is that in order to avoid cluttering the drawing, the lifting driving element 60 is omitted in each "linkage mechanism diagram" and will be explained first).

A parallel four-link assembly 70 is pivotally mounted on the frame 91 . The parallel four-link assembly 70 has a first rod 71, a second rod 72, a third rod 73, a fourth rod 74, a first pivot point 75, a second pivot point 76, a A third pivot point 77 and a fourth pivot point 78 . The first rod 71 has a lifting pivot portion 711 , and the lifting telescopic rod 62 is for the lifting driving element 60 to be pivoted on the lifting pivot portion 711 . The first rod 71 is parallel to the third rod 73 , and the third rod 73 has a linkage pivot portion 731 , and the second rod 72 is parallel to the fourth rod 74 . The first pivot point 75 is pivotally connected to the first rod 71 and the second rod 72, and the first pivot point 75 is for the parallel four-link assembly 70 to be pivoted on the link pivot portion 91C; The second pivot point 76 is pivotally connected to the second rod 72 and the third rod 73, and the second pivot point 76 is used for the parallel four-link assembly 70 to abut against the resisting portion 91D and leave ( Please refer to Figures 5B, 5D, 6A and 6C) for one of the actions of the resisting portion 91D. The third pivot point 77 is pivotally connected to the third rod 73 and the fourth rod 74; the tailgate 92 integrally extends from at least one of the third rod 73 and the fourth rod 74; Four pivot points 78 are pivotally connected to the fourth rod 74 and the first rod 71 .

A linkage rod assembly 80 is pivotally disposed between the linkage pivot portion 731 and the link pivot portion 91C. The linkage rod assembly 80 has a first link 81, a second link 82 and a linkage Pivot point 83. The linkage pivot point 83 is used to pivotally connect the first link 81 and the second link 82 . The first link 81 and the second link 82 are respectively used for the linkage assembly 80 to be pivoted on the The linkage pivot portion 731 and the link pivot portion 91C.

The lifting driving element 60 can be a hydraulic cylinder.

Furthermore, the present invention can drive the truck tailgate to perform the following two actions:

[a] Level rise and fall. Referring to Figures 4A and 4C, the telescopic rod 42 of the tailgate flip driving member 40 contracts. And the lifting and telescopic rod 62 is located at the extended position P1, then the tailgate 92 is located at the descending position PA1, and then the lifting and telescopic rod 62 is controlled to contract from the descending position PA1 to the retracted position P2. In the process, the lifting pivot is used. The parallel four-link assembly 70 is pulled up by the portion 711 , and the second pivot point 76 allows the parallel four-link assembly 70 to abut against the vehicle frame 91 , so that the parallel four-link assembly 70 deforms and lifts the tailgate 92 from The descending position PA1 is pulled up to the ascending position PA2 (as shown in Figures 4B and 4D).

As for further descent, just reverse the operation and no further details will be given.

[b] Flip during lifting. It is further divided into ascending flipping and descending flipping: Regarding ascending flipping: first, still referring to Figures 4A and 4C, the telescopic rod 42 of the tailgate flipping driving member 40 contracts. And the lifting and telescopic rod 62 is located at the extended position P1, and the tailgate 92 is located at the lowered position PA1. Then, the tailgate flip driving member 40 is first started, and the telescopic rod 42 extends and pushes the tailgate 92 through the second plate 20. The first plate member 10 moves downward (as shown in Figure 5A) until the resisting notch 11 is located at a resisting position PR (as shown in Figure 5C). And in the process of controlling the lifting telescopic rod 62 to change from the extended position P1 to the retracted position P2, the tailgate 92 is linked to start to rise. The rise can be divided into two stages. The first stage is to change from the descending position PA1. To a conversion position PB1, this stage is purely rising and does not flip. Until the linkage pivot point 83 of the linkage lever assembly 80 abuts against the abutment notch 11 , the tailgate 92 is at the conversion position PB1 (starting the second stage), and the second pivot point 76 begins to leave. The abutment portion 91D and the parallel four-link assembly 70 deform and begin to flip the tailgate 92 until the tailgate 92 is in the flip position PB2 (as shown in Figures 5B and 5D).

Regarding lowering and flipping: this action is divided into the following two stages. The first stage is from the flipping position PB2 to the switching position PB1. This first stage is the turning and descending action. When the tailgate 92 is at the flipping position PB2 (as in the first 6A and 6C), first control the telescopic rod 42 of the tailgate flipping driving member 40 to retract (the first elastic member 30 is pulled open), so as to prevent the tailgate flipping driving member 40 from bearing pressure. The current value of the load of the tailgate flip driving component 40 becomes higher and higher, resulting in burnout. Then control the lifting telescopic rod 62 During the reverse process of changing from the retracted position P2 to the extended position P1, since the linkage pivot point 83 of the linkage rod assembly 80 remains against the resistance notch 11, the parallel four-link linkage is further linked. The assembly 70 deforms until the tailgate 92 moves back to the raised position PA2 (as shown in Figures 6B and 6D), so the first stage is to flip and fall at the same time.

In the second stage, the conversion position PB1 is reset to the falling position PA1. This stage is a pure falling action without flipping. The linkage pivot point 83 of the linkage rod assembly 80 begins to retreat away from the resisting notch 11 (as shown in Figure 6E), and performs a pure downward process. At the same time, due to retreating from the resisting notch 11, the first The plate 10 is no longer stuck and can be pulled up and reset by the first elastic member 30 (refer to Figure 4C). Finally, the second pivot point 76 contacts the resisting portion 91D (as shown in Figure 4A). And the tailgate 92 moves back to the descending position PA1 to complete the descending flip.

The advantages and effects of the present invention can be summarized as follows:

[1] It can prevent the electric cylinder from being damaged when the tailgate is lowered and flipped. When the tailgate is to be changed from the flipping position to the conversion position (that is, the first stage of downward flipping), the electric cylinder (that is, the tailgate flipping driver) can be controlled to retract first (at this time, the first plate (the electric cylinder is still pulled by the first elastic member), it can avoid the problem of burning out due to the pressure on the electric cylinder causing the current value of the load to become higher and higher. Therefore, damage to the electric cylinder can be prevented when the tailgate is lowered and flipped.

[2] The electric cylinder and linkage rod assembly controls the flipping structure with simple structure and low cost. This case is equipped with an electric cylinder and a linking rod assembly, which can be used to control the flipping of the tailgate. The electric cylinder has a simple structure, and the linking rod assembly is a mechanical connecting rod, and the cost is lower than that of the known hydraulic drive device. Therefore, the electric cylinder and linkage rod assembly controls the flipping structure with simple structure and low cost.

[3] It has a protective mechanism to reduce the chance of damage due to extrusion. In the present invention, a second elastic member and a suspension rod are provided in conjunction with the electric cylinder (that is, the tailgate flip driving member). When the first plate member, the second plate member and the tailgate flip driving member are squeezed, the second elastic member (taking the third embodiment as an example, or the third elastic member) can An elastic member) that buffers the force of extrusion and reduces the chance of extrusion damage. Therefore, it has the ability to protect the mechanism and reduce the chance of damage due to extrusion.

The above is only a detailed description of the present invention through preferred embodiments. Any simple modifications and changes made to the embodiments do not deviate from the spirit and scope of the present invention.

10:The first plate

11: Press against the notch

20:Second plate

30: First elastic member

40: Tailgate flip driver

41:Cylinder block

42: Telescopic rod

90: Truck body

91: Frame

M1: The first pivot point of the first plate

M2: The second connection point of the first plate

M3: The first pivot point of the second plate

M4: The second connection point of the second plate

M5: The third pivot point of the second plate

Claims (4)

An ejection device for a flip tailgate, which includes: a first plate used to be pivoted on a truck body, the truck body at least includes a frame; the first plate has a top resisting recess mouth, a first pivot point of the first plate member and a second connection point of the first plate member, the resisting notch and the first pivot point of the first plate member are respectively located at both ends of the first plate member, The first pivot point of the first panel is for the first panel to be pivoted on the vehicle frame, and the second connection point of the first panel is located between the resisting notch and the first pivot point of the first panel. between the points; a second plate member is pivotally installed on the vehicle frame. The second plate member has a first pivot point of the second plate member, a second connection point of the second plate member and a second plate member. a third pivot point of the second plate member, the first pivot point of the second plate member is for the second plate member to be pivotally mounted on the frame; a first elastic member is pivotally disposed at the second connection point of the first plate member; Between the second connection points of the second plate member, it is used to tighten the first plate member and the second plate member; and a tailgate flip driving member is pivotally installed on the vehicle frame, and the tailgate The flip driving part has a cylinder and a telescopic rod; the telescopic rod can telescope relative to the cylinder; and the cylinder system allows the tailgate flip driving part to be pivoted on the frame, and the telescopic rod provides The tailgate flip driving member is pivoted at the third pivot point of the second plate; thereby, when the tailgate flip driving member is activated, the telescopic rod extends out of the cylinder to push the second plate. The second plate member pushes the first plate member to move, and the resisting notch is used to generate a resisting force. The ejection device for the flip tailgate described in claim 1 further includes: a hanger, which is pivotally installed between the cylinder and the frame; and the frame further includes a limiting part, which is Extends laterally from the frame and blocks below the position where the hanger is pivoted on the frame, so that the hanger can only rotate upward relative to the frame and cannot rotate downward, thus forming a safe supporting structures; and A second elastic member is pivotally connected between the cylinder and the frame; so that the cylinder, the suspension rod, the second elastic member and the frame are nearly in a triangular distribution shape; thereby, when the third When a plate member, the second plate member and the tailgate flipping driving member are squeezed, the tailgate flipping driving member can buffer the squeezing force through the second elastic member, thereby reducing the probability of squeezing damage. An ejection device for a flip tailgate, which includes: a first plate used to be pivoted on a truck body, the truck body at least includes a frame; the first plate has a top resisting recess mouth, a first pivot point of the first plate member and a second connection point of the first plate member, the resisting notch and the first pivot point of the first plate member are respectively located at both ends of the first plate member, The first pivot point of the first panel is for the first panel to be pivoted on the vehicle frame, and the second connection point of the first panel is located between the resisting notch and the first pivot point of the first panel. between the points; a second plate member is pivotally installed on the vehicle frame. The second plate member has a first pivot point of the second plate member, a second connection point of the second plate member and a second plate member. a third pivot point of the second plate member, the first pivot point of the second plate member is for the second plate member to be pivoted on the vehicle frame; a first elastic member is provided corresponding to the first plate member; a tailgate The flipping driving part is pivotally installed on the vehicle frame. The tailgate flipping driving part has a cylinder and a telescopic rod. The telescopic rod can telescope relative to the cylinder. In addition, the cylinder system allows the tailgate to flip. The driving member is pivotally mounted on the vehicle frame, and the telescopic rod is used for the tailgate flipping driving member to be pivotally mounted at the third pivot point of the second plate; and a suspension rod is pivotally mounted between the cylinder and the vehicle. Between the frames, the hanger has a hanger connection point; the first elastic member is pivotally connected between the second connection point of the first plate and the hanger connection point; the vehicle frame further includes a limiting part , which extends sideways from the frame and blocks below the position where the hanger is pivoted on the frame, so that the hanger can only rotate upward relative to the frame and cannot rotate downward. , forming a safe support structure; Thereby, when the tailgate flip driving member is activated, the telescopic rod extends out of the cylinder to push the second plate, and the second plate pushes the first plate to move, and the resisting notch is used to To generate a resisting force; and when the first plate member, the second plate member and the tailgate flip driving member are squeezed, the tailgate flip driving member can buffer the squeeze through the first elastic member force to reduce the chance of crushing damage. A truck tailgate system with an ejection device for a flip tailgate, which includes: an ejection device for a flip tailgate as defined in any one of claims 1 to 3; a lifting drive element, which is provided on the vehicle The frame has a lifting cylinder and a lifting telescopic rod. The lifting cylinder system is used for the lifting driving element to be pivoted on the frame. The lifting telescopic rod is connected to the lifting cylinder and has at least an extended position and a telescopic rod. into the position; the truck body also includes a tailgate, and the frame has a lifting pivot portion, a connecting rod pivot portion and a resisting portion; the lifting cylinder system is pivoted on the lifting pivot portion; A parallel four-link assembly is pivotally mounted on the vehicle frame; the parallel four-link assembly has a first rod, a second rod, a third rod, a fourth rod, and a first pivot point, A second pivot point, a fourth pivot point and a fourth pivot point; the first rod system has a lifting pivot part, and the lifting telescopic rod is for the lifting driving element to be pivoted on the lifting pivot part part; the first rod is parallel to the third rod, and the third rod has a connecting pivot part, and the second rod is parallel to the fourth rod; the first pivot point is pivotally connected to the first rod and the second rod, and the first pivot point is for the parallel four-link assembly to be pivoted on the connecting rod pivot portion; the second pivot point is for pivoting the second rod and the third rod , and the second pivot point is used for the parallel four-link assembly to perform one of the actions of abutting the resisting portion or leaving the resisting portion; the third pivot point is pivotingly connected to the third rod and the fourth rod; the tailgate is integrally extended from at least one of the third rod and the fourth rod; the fourth pivot point is pivotally connected to the fourth rod and the first rod; and a linking rod assembly, The linkage pivot is provided between the linkage pivot part and the link pivot part. The linkage rod assembly has a first link, a second link and a linkage pivot point; the linkage pivot point is Connect this with a pivot The first link and the second link are respectively used by the linkage assembly to be pivoted on the linkage pivot portion and the link pivot portion; thereby, the truck The tailgate system can perform the following two actions: [a] Horizontal lifting: the telescopic rod of the tailgate flip driving member contracts, and the lifting telescopic rod is in the extended position, then the tailgate is in the lowered position, and then the tailgate is controlled The lifting telescopic rod retracts from the lowered position to the retracted position, and in the process, the parallel four-link assembly is pulled up through the lifting pivot part, and the second pivot point allows the parallel four-link assembly to abut against the vehicle frame. Then the parallel four-link assembly deforms and pulls the tailgate from the descending position to the ascending position; [b] flipping during lifting: flipping up: the telescopic rod of the tailgate flipping driver contracts, and the lifting telescopic The rod is in the extended position, and the tailgate is in the lowered position. Then, the tailgate flip driving member is started first, and the telescopic rod extends and pushes the first plate through the second plate to move downward to the top. The notch is located at a pushing position; and in the process of controlling the lifting telescopic rod to change from the extended position to the retracted position, the tailgate begins to rise. The rise is divided into two stages. The first stage starts from the retracted position. The descending position changes to a conversion position. At this stage, it only rises without turning over until the linkage pivot point of the linkage rod assembly abuts the abutment notch. At this time, the tailgate is in the conversion position, and the second pivot joint The point begins to leave the abutment portion, and the parallel four-link assembly deforms and begins to flip the tailgate until the tailgate is in the flipping position; descending flipping: this action is divided into the following two stages; the first stage is from the flipping position To the switching position, the first stage is a flipping and descending action. When the tailgate is in the flipping position, the telescopic rod that controls the tailgate flipping driving member is retracted, and the first elastic member is pulled open. This can prevent the tailgate flipping drive component from being burned out due to the pressure on the load of the tailgate flipping drive component. The lift telescopic rod is then controlled to change from the retracted position to the extended position. During the reverse process, since the linkage pivot point of the linkage rod assembly remains against the It resists the notch, and then deforms the parallel four-link assembly until the tailgate moves back to the upward position; the second stage is to reset from the conversion position to the downward position, and this stage is a pure downward movement without turning over. ; The linkage pivot point of the linkage rod assembly begins to retreat from the resisting notch and performs a pure descent process. At the same time, due to retreating from the resisting notch, the first plate is no longer stuck and can be The first elastic member is pulled up and reset, and finally the second pivot point contacts the resisting portion, and the tailgate moves back to the lowered position, completing the lowering and flipping.

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