TWI784868B - Turnover control device for truck tailgate - Google Patents

Abstract

The invention comprises a vehicle frame, a tailgate, two link assemblies, a power source and a link brake assembly. The two connecting rod assemblies are erected between the vehicle frame and the tailgate, the power source is pivotally connected between the vehicle frame and the connecting rod assembly; the connecting rod braking assembly is pivotally arranged between the connecting rod assembly and the tailgate. When the link brake assembly is in an unlocked position, the vehicle frame and the link assembly can rotate relative to each other, and the link assembly can rotate, and the power source can drive the tailgate to change between a lowered position and an raised position through the link assembly. When the link brake assembly is in the locked position, the vehicle frame and the link assembly can rotate relative to each other, but the link assembly and the tailgate are fixed, and the power source can drive the tailgate through the link assembly to flip and transform between a lowered position and a door-closed position. This case has the advantages of using the electric cylinder to control the lifting and turning, the structure is simple and the cost is low, and the lifting action and turning action are completely separated to improve safety. .

Description

Turnover control device for truck tailgate

The invention relates to a turning control device for a tailgate of a truck, in particular to a turning control device for a tailgate of a truck, which is simple in structure and low in cost by using an electric cylinder to control the lifting and turning, and is completely separated from the lifting action and the turning action to improve safety. .

The known control devices for lifting and turning the tailgate of trucks include at least three types: single hydraulic cylinder drive, double hydraulic cylinder drive, and cam contact control.

Taking single hydraulic cylinder drive as an example, it can have the following designs:

1. Use the same hydraulic cylinder to drive lifting and turning. Take Taiwan's new patent No. M253513 for the truck tailgate that can be automatically locked and raised and lowered as an example. Its action principle is to shake a connecting rod when turning over to make it contact the truck tailgate device, so that the mechanism changes from 2 degrees of freedom to 1 freedom. At this time, the same hydraulic cylinder is used to drive the tailgate to turn over.

2. Utilizing the shape limitation of the tailgate joint, it is driven by a single hydraulic cylinder. Take the truck tailgate lifting mechanism of Taiwan New Patent No. M426533 as an example, its action principle is: (1) the truck tailgate first rises and then flips (closes); Perform a descent.

The dual hydraulic cylinder drive has at least two examples of the automatic lifting device of the truck tailgate of Taiwan's new patent No. M301159, and the structure of the adjustable level of the truck tailgate panel of Taiwan's new patent No. M376454.

As for the cam contact control, it is the most widely used truck tailgate lifting and turning device on the market, which uses the contact of the cam to control the lifting or turning movement:

1. When the cam is not in contact with the tailgate of the truck (the cam pair does not work), the tailgate of the truck will move up and down due to gravity.

2. When the cam comes into contact with the tailgate of the truck (the cam pair acts), the mechanism changes from 2 degrees of freedom to 1 degree of freedom. At this time, when the tailgate of the truck rises to 2/3 of the height, the cam pair Flip movement.

Summing up the aforementioned known devices produces the following disadvantages:

[1] The structure is complicated and the operation is troublesome. The structure of the known device is complex, the volume of the hydraulic device is too large, and the operation is cumbersome.

[2] The cost of hydraulic drive system is too high. The force arm of the hydraulic drive is too small, and a relatively large driving hydraulic pressure must be used. In addition to the high cost, it is also prone to danger due to oil leakage.

[3] The tailgate may reverse and cause an accident. The truck tailgate must have two actions, one is vertical lifting, and the other is tailgate flipping. When the tailgate of a truck is moving up and down, when the cam pair is at the trigger position and the driver is still driving up, and the user does not know it, the tailgate will be lifted to a certain height and reversed, which may accidentally cause personal injury , and even lead to death.

In view of this, must develop the technology that can solve above-mentioned conventional shortcoming.

The purpose of the present invention is to provide a turning control device for the tailgate of a truck, which has the advantages of simple structure and low cost by using an electric cylinder to control the lifting and turning, and the lifting action and turning action are completely separated to improve safety. In particular, the problem to be solved by the present invention is that the structure of the tailgate of the known truck is complex and cumbersome to operate, the cost of the hydraulic drive system is too high, and the tailgate may reverse and cause accidents.

The technical means to solve the above problems is to provide a turning control device for the tailgate of a truck, which includes: a truck body, which includes a frame and a tailgate; the frame has two first pivotal parts, at least one first Two pivotal joints, at least one abutting portion and a frame rear edge portion; the at least one second pivotal joint is located between the two first pivotal joints, and the at least one abutting portion is located between the two first pivotal joints Below the pivot joint, the tailgate tie There are two tailgate levers, two first tailgate pivot joints and two second tailgate pivot joints, the two first tailgate pivot joints correspond to the two first pivot joints, and are located on the two tailgate levers Between; the two second tailgate pivot joints are respectively located on the two tailgate rods; the two connecting rod assemblies are respectively pivotally arranged on the truck body, and each connecting rod assembly in the two connecting rod assemblies is It has a first rod, a second rod, a third rod, a first pivot point and a second pivot point; the two first rods are respectively pivoted to the two first pivot parts with their one ends, And the two first rods are pivotally arranged on the two first tailgate pivot joints with their other ends respectively, and the two first rods all have a first rod pivot point position; the two first pivot joints They are all located on the vehicle frame, and are respectively coaxial with the two first pivot joints. The two second rods are respectively pivoted at the two first pivot joints with their one ends, and the two second pivot joints are pivotally connected to the two first pivot joints respectively. Corresponding to the other ends of the two second rods and one end of the two third rods, the two second tailgate pivot joints are respectively pivotally connected to the corresponding other ends of the two third rods and the two tail gates. door lever; and then by the corresponding two first rods, the two second rods, the two third rods and the two tail gate rods, two four-bar linkages are formed, so that the two four-bar linkages are respectively erected Between the vehicle frame and the tailgate; at least one power source is arranged between the truck body and the two link assemblies; the at least one power source has a fixed part and a movable part, and the fixed The part is for the at least one power source to be pivotally connected to the at least one second pivotal part, the movable part is for the at least one power source to be pivotally connected between the two first rod pivot points, and the movable part At least one retractable position and one extended position can be changed; and at least one link brake assembly is arranged between the tailgate and the corresponding first rod, and the at least one link brake assembly has an unlocking position and a locked position; thereby, the turning control device of the truck tailgate has the following two modes of action: lift mode: when the at least one link brake assembly is in the unlocked position, the corresponding two first tailgates Between the pivot joint and the two first rods, and between the two corresponding second tailgate pivot joints and the two third rods, relative rotation is possible; the movable part is located at the retracted position, and The tailgate is located on a drop location. In the process of controlling the movable part from the withdrawn position to the extended position, the two second pivot points in the two four-bar linkages remain against the at least one abutting part due to gravity, and then through the two A four-bar linkage mechanism drives the tailgate from the lowered position to a raised position through a rising position; overturn mode: when the at least one link brake assembly is in the locked position, the corresponding two first The tailgate pivot joints and the two first bars, and the corresponding second tail gate pivot joints and the two third bars are relatively fixed; the movable part is located at the retracted position, And when the tailgate is in the lowered position, the process of controlling the movable part from the retracted position to the extended position can be driven through the two four-bar linkages to drive the tailgate from the lowered position through a flipping process. The position is changed to a closed position.

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

The present invention is hereafter described in detail with the following embodiments and accompanying drawings:

10: truck body

11: Frame

111: the first pivot joint

112: the second pivot joint

113: Top Arrival

114: rear edge of frame

12: Tailgate

121:Tail gate lever

20: Connecting rod assembly

21: First shot

211: The pivot point of the first lever

22: Second shot

23: Third shot

24: The first pivot point

25: The second pivot point

30: power source

31: fixed part

32: Activity Department

40: Connecting rod brake assembly

C1: The first tailgate pivot joint

C2: Second tailgate pivot joint

V1: brake seat

V2: Keyhole

V3: lock pin

P1: retract position

P2: extended position

PA: unlocked position

PB: locked position

M: drop position

M11: rising position

M12: up position

M21: Flip middle position

M22: Closed position

θ: working angle

Fig. 1 is a schematic diagram of the present invention

Figure 2A is a schematic diagram of one of the lifting actions of the present invention

Figure 2B is a schematic diagram of another angle of Figure 2A

Figure 3A is a schematic diagram of the second lifting action of the present invention

Figure 3B is a schematic diagram of another angle of Figure 3A

Figure 4A is a schematic diagram of the third lifting action of the present invention

Figure 4B is a schematic diagram of other angles of Figure 4A

Figure 5A, Figure 5B and Figure 5C are schematic diagrams of the mechanism of Figure 2B, Figure 3B and Figure 4B respectively

Figure 6A is a schematic diagram of the lifting angle of the present invention

Figure 6B is a schematic diagram of the organization in Figure 6A

Figure 7A is a schematic diagram of the corresponding relationship between the connecting rod brake assembly of the present invention at the unlocked position and the truck body and the connecting rod assembly

Figure 7B is a schematic diagram of the corresponding relationship between the connecting rod brake assembly of the present invention at the locked position and the truck body and connecting rod assembly

Figures 8A, 8B and 8C are schematic diagrams of the corresponding unlocked position, locked position and locked position of the linkage brake assembly of the present invention

Figure 9A is a schematic diagram of one of the flipping actions of the present invention

Figure 9B is a schematic diagram of other angles of Figure 9A

Figure 10A is a schematic diagram of the second turning action of the present invention

Figure 10B is a schematic diagram of other angles of Figure 10A

Figures 11A and 11B are schematic diagrams of the mechanisms of Figures 9B and 10B respectively

Figure 12A is a schematic diagram of the flip angle of the present invention

Figure 12B is a schematic diagram of the organization in Figure 11A

See 1st, 2A, 2B, 3A, 3B, 4A, 4B, 5A, 5B, 5C, 6A, 6B, 7A, 7B, 8A, 8B, 8C, No. 9A, No. 9B, No. 10A, No. 10B, No. 11A, No. 11B, No. 12A and Fig. 12B, the present invention is a turning control device for the tailgate of a truck, which includes: a truck body 10, which is It includes a vehicle frame 11 and a tailgate 12 . The vehicle frame 11 has two first pivotal parts 111, at least one second pivotal part 112, at least one abutting part 113 and a frame rear edge part 114; the at least one second pivotal part 112 is located at the The at least one abutting portion 113 is located below the two first pivotal portions 111 and is between the two first pivotal portions 111 . The tailgate 12 has two tailgate levers 121, two first tailgate pivot joints C1 and two second tailgate pivot joints C2, and the two first tailgate pivot joints C1 correspond to the two tailgate pivot joints C1. The first pivot joint part 111 is located between the two tailgate levers 121 ; the two second tailgate pivot joint parts C2 are respectively located on the two tailgate levers 121 .

The two link assemblies 20 are respectively pivotally mounted on the truck body 10, and each link assembly 20 in the two link assemblies 20 has a first rod 21, a second rod 22, and a third rod 23 , a first pivot point 24 and a second pivot point 25 . One end of the two first rods 21 is respectively pivotally mounted on the two first pivot joints 111 , and the other ends of the two first rods 21 are respectively pivotally mounted on the two first tailgate pivot joints C1 , and, The two first rods 21 both have a first rod pivot point 211 . The two first pivot points 24 are all located on the vehicle frame 11, and are coaxial with the two first pivot portions 111 respectively, and the two second rods 22 are respectively pivotally mounted on the two first pivot points 24 with one ends thereof. , the two second pivot points 25 are respectively pivotally connected to the other ends of the corresponding two second rods 22 and one ends of the two third rods 23, and the two second tailgate pivot parts C2 are respectively pivotally connected to each other. The other ends of the corresponding two third rods 23, and the two tailgate rods 121; and then the corresponding two first rods 21, the two second rods 22, the two third rods 23 and the two tail gates. The door rod 121 constitutes two four-bar linkages, so that the two four-bar linkages are erected between the vehicle frame 11 and the tailgate 12 respectively.

At least one power source 30 is arranged between the truck body 10 and the two connecting rod assemblies 20 . The at least one power source 30 has a fixed part 31 and a movable part 32, the fixed part 31 is for the at least one power source 30 to be pivotally connected to the at least one second pivot part 112, and the movable part 32 is for the At least one power source 30 is pivotally connected between the two first lever pivot points 211 , and the movable part 32 is at least switchable between a retracted position P1 and an extended position P2 .

At least one link brake assembly 40 is arranged between the tailgate 12 and the corresponding first rod 21, and the at least one link brake assembly 40 has an unlocked position PA (as shown in FIG. 7A ) And a locked position PB (as shown in Fig. 7B).

In this way, the turning control device of the truck tailgate has the following two action modes:

[a] Lifting mode: when the at least one link brake assembly 40 is located at the unlock position PA, between the corresponding two first tailgate pivot joints C1 and the two first rods 21, and the corresponding two Between the second tailgate pivotal portion C2 and the two third rods 23 , both are relatively rotatable. The movable part 32 is located at the retracted position P1 and the tailgate 12 is located at a lowered position M. Controlling the process of changing the movable part 32 from the retracted position P1 to the extended position P2, the two second pivot points 25 in the two four-bar linkages are kept against the at least one abutting part due to gravity 113 (refer to Figures 5A, 5B to 5C). Then drive the tailgate 12 from the lowered position M (see the 2B and 5A figures) through the two four-bar linkages, and change to a raised position M12 through a rising position M11 (see the 3B and 5B figures). (See Fig. 4B and Fig. 5C), and the reverse operation will not be repeated.

[b] Overturning mode: when the at least one link brake assembly 40 is located at the locked position PB, between the corresponding two first tailgate pivot joints C1 and the two first rods 21, and the corresponding The two second tailgate pivot joints C2 and the two third rods 23 are relatively fixed. When the movable part 32 is located at the retracted position P1 and the tailgate 12 is located at the lowered position M. The process of controlling the movable part 32 from the retracted position P1 to the extended position P2 can drive the tailgate 12 from the lowered position M through the two four-bar linkages (see Figures 2B and 5A), Through a reverse position M21 (referring to the 9th B and the 11A figure), change to a door-closing position M22 (referring to the 10B and the 11B figure), then do not go into details as for the reverse operation.

In practice, the body 10 of the truck can further include a plurality of wheels and a front (the basic structure of a known truck is not shown in the drawing, and will be described first).

The at least one abutting part 113 can be a long plate (bar) structure (as shown in Figure 1, this case is the example), and at the same time for the two second pivot points 25 to keep against, it can also be two Independent structures (located on the opposite outer sides of the two first pivotal portions 111 respectively) are respectively used for keeping the two second pivotal points 25 against.

The length of the tailgate 12 can be 80mm.

The length of the two first rods 21 can be 480mm.

The length of the two second rods 22 can be 77mm.

The length of the two third rods 23 can be 477.5mm.

According to the aforementioned specifications, no matter whether the tailgate 12 is controlled to lift or turn over, the two first levers 21 can also rotate with the corresponding first pivot portion 111 as the axis for a working angle θ (For example, the lifting action shown in Figures 6A and 6B, or the turning action shown in Figures 12A and 12B, for example), the working angle θ can be 93.6 degrees.

The at least one power source 30 can be an electric cylinder.

Referring to Figures 7A, 7B, 8A, 8B and 8C, the at least one link brake assembly 40 can correspond to the two first rods 21 and form two groups, each of the two link brake assemblies 40 The link brake assembly 40 may include a brake seat V1 , a lock hole V2 and a lock pin V3 .

The brake seat V1 is fixed on one of the first rod 21 and the tailgate 12 .

The lock hole V2 is located on the other of the first rod 21 and the tailgate 12 .

The lock pin V3 is movably arranged on the brake seat V1, and when pulled out of the lock hole V2, it is located at the unlock position PA, and when inserted into the lock hole V2, it is located at the lock position PB.

Of course, simple position and structure changes can still achieve the device of unlocking and locking functions, which is not out of the scope of protection of this case.

The two modes of action in this case are described as follows:

[a] Lifting mode: refer to Figure 2A, for example, when the tailgate 12 is at the lowered position M (as shown in Figure 2B), and the lock pin V3 is pulled out of the lock hole V2 to be at the unlocked position PA (as shown in Figure 7A), is equivalent to the two four-bar linkages (actually including the corresponding two linkage assemblies 20 and the two tailgate levers 121) in a rotatable state, and the movable part 32 is located in the retracted position P1 (as shown in Fig. 5A). At this time, as long as the movable part 32 is controlled to change from the retracted position P1 to the extended position P2, the two second pivot points 25 in the two four-bar linkages are forced to maintain due to gravity during the change process. against At the at least one abutting portion 113, and through the two link assemblies 20 and the two tailgate rods 121, the tailgate 12 is in a nearly horizontal state, from the lowered position M (as shown in FIG. 5A ), Through the rising position M11 (as shown in the 3A, 3B and 5B figures), change to the rising position M12 (as shown in the 4A, 4B, 5C, 6A and 6B figures), at this time The tailgate 12 is substantially adjacent (maybe quite close to, or touches) the frame rear edge portion 114 . Of course, as long as the operation is reversed, the descent will not be repeated.

The lifting action of the truck tailgate is mainly to facilitate the lifting of heavy objects from the ground (or a low place) to the truck body 10 (or a high place), which is known in the relevant industry and will not be described in detail.

[b] Overturn mode: refer to Figure 2A, similarly, when the tailgate 12 is at the lowered position M (as shown in Figure 2B), and the lock pin V3 is inserted into the lock hole V2 and is located at the locked position PB (As shown in Fig. 7B, refer to the process of moving and locking the lock pin V3 in Fig. 8A, Fig. 8B to Fig. 8C, but in Fig. 8A, Fig. 8B and Fig. 8C, the locking hole V2 is omitted, Firstly stated), it is equivalent to the two four-bar linkages (actually including the corresponding two linkage assemblies 20 and the two tail gate levers 121) are fixed and cannot rotate, but the two The four-bar linkage mechanism can rotate relative to the frame 11 with the two first pivotal parts 111 and the two first pivotal points 24 respectively, and when the movable part 32 is located at the retracted position P1. At this time, as long as the movable part 32 is controlled to change from the retracted position P1 to the extended position P2, the tailgate can be opened and closed through the two fixed link assemblies 20 and the two tailgate levers 121 during the transformation process. 12 From the descending position M (as shown in Figure 5A), through the flipping position M21 (as shown in Figures 9A, 9B and 11A), to the door closing position M22 (as shown in Figures 10A, 10B, Figures 11B, 12A, and 12B), at this time the tailgate 12 closes the truck body 10, and it is quite close (maybe only a small gap remains, or even touches) the rear edge of the frame Section 114. In the same way, to open the tailgate 12, only the reverse operation is required, and no further description will be given.

The turning action of the known truck tailgate is mainly used to close or open the truck body 10 . It must be closed after loading or before driving, and it must be opened when it is desired to load or unload. This is known in the relevant industry and will not be described in detail.

Advantage and effect of the present invention can be summarized as follows:

[1] Controlling lifting and turning by electric cylinder is simple in structure and low in cost. In this case, a single power source (electric cylinder) is set to control the lifting and turning of the tailgate. The structure of the electric cylinder is simple, and the cost is lower than that of the known hydraulic drive device. Therefore, using the electric cylinder to control the lifting and turning has a simple structure and low cost.

[2] The lifting action is completely separated from the turning action to improve safety. As far as the design of this case is concerned, whether it is to control the lift or flip of the tailgate, it will all start from the lowered position (except for the reverse action mentioned in the manual of this case), and the lift is simply rising and falling (reciprocating according to demand) Operation), flipping is simply flipping and closing the door (reciprocating operation according to demand), the two actions are not combined; it can effectively prevent the known truck tailgate from being loaded (taking the action of rising or falling as an example), and the cam does not Be careful of the risk of direct flipping of the tailgate (known missing, not described in detail) at the contact position. Therefore, the lifting action is completely separated from the turning action to improve safety.

The above is only a detailed description of the present invention through preferred embodiments, and any simple modifications and changes made to the embodiments will not depart from the spirit and scope of the present invention.

10: truck body

11: Frame

111: the first pivot joint

112: the second pivot joint

113: Top Arrival

114: rear edge of frame

12: Tailgate

121:Tail gate lever

20: Connecting rod assembly

21: First shot

211: The pivot point of the first lever

22: Second shot

23: Third shot

24: The first pivot point

25: The second pivot point

30: power source

31: fixed part

32: Activity Department

C1: The first tailgate pivot joint

C2: Second tailgate pivot joint

P2: extended position

M12: up position

Claims (3)

A turning control device for a truck tailgate, comprising: a truck body, including a frame and a tailgate; the frame has two first pivot joints, at least one second pivot joint, and at least one roof Reach portion and a frame rear edge portion; the at least one second pivotal portion is located between the two first pivotal portions, the at least one abutting portion is located below the two first pivotal portions, the tailgate It has two tailgate levers, two first tailgate pivot joints and two second tailgate pivot joints, the two first tailgate pivot joints correspond to the two first pivot joints, between the rods; the two second tailgate pivot joints are respectively located on the two tailgate rods; the two connecting rod assemblies are respectively pivotally arranged on the truck body, and each connecting rod assembly in the two connecting rod assemblies It has a first rod, a second rod, a third rod, a first pivot point and a second pivot point; the two first rods are respectively pivoted at the two first pivot parts with their one ends , and the other ends of the two first rods are respectively pivoted to the two first tailgate pivot joints, and the two first rods all have a first rod pivot point; the two first pivot joints The points are all located on the vehicle frame, and are coaxial with the two first pivot joints respectively. The two second rods are respectively pivoted at the two first pivot joints with their one ends, and the two second pivot joints are respectively pivoted. The other ends of the corresponding two second rods and one end of the two third rods are connected. Tail gate bar; And then constitute two four-bar linkages by the corresponding two first bars, the two second bars, the two third bars and the two tail gate bars, so that the two four-bar linkages are respectively erected between the vehicle frame and the tailgate; at least one power source is arranged between the truck body and the two connecting rod assemblies; the at least one power source has a fixed part and a movable part, the The fixed part is for the at least one power source to be pivotally connected to the at least one second pivotal part, and the movable part is for the at least one power source to be pivotally connected between the two first rod pivot points, and the movable part is The portion is at least convertible between a retracted position and an extended position; and At least one link brake assembly is arranged between the tailgate and the corresponding first rod, and the at least one link brake assembly has an unlocked position and a locked position; thereby, the truck tailgate The overturn control device has the following two action modes: lift mode: when the at least one link brake assembly is at the unlock position, the corresponding two first tailgate pivot joints and the two first rods, and the corresponding Between the corresponding two second tailgate pivot joints and the two third rods, all can be relatively rotated; the movable part is located at the retracted position, and when the tailgate is located at a lowered position, the movable part is controlled from In the process of changing the retracted position to the extended position, the two second pivot points in the two four-bar linkages remain against the at least one abutting portion due to gravity, and then through the two four-bar linkages Drive the tailgate from the lowered position, through a rising position, to a raised position; flip mode: when the at least one link brake assembly is at the locked position, the corresponding two first tailgate pivots Between the two first rods, and between the two corresponding second tailgate pivot joints and the two third rods, they are relatively fixed; the movable part is located at the retracted position, and the tailgate is at the In the lowered position, the process of controlling the movable part from the retracted position to the extended position can drive the tailgate from the lowered position through the two four-bar linkages to a closed position through an inversion position. Location. The turning control device for the tailgate of a truck according to claim 1, wherein the at least one power source is an electric cylinder. The turning control device for the tailgate of a truck as described in claim 1, wherein: the at least one link braking assembly corresponds to the two first levers, and is in two groups, and each link braking in the two link braking assemblies The assembly includes a brake seat, a lock hole and a lock pin; the brake seat is fixed on one of the first rod and the tailgate; the lock hole is located on the other of the first rod and the tailgate. above; and The lock pin is movably arranged on the brake seat, and when pulled out of the lock hole, it is located at the unlocked position, and when inserted into the lock hole, it is located at the locked position.

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