TWI728679B - Truck tailgate lifting device driven by crank rocker arm - Google Patents

Abstract

The present invention includes a base part and a crank power unit connecting the base part, a pair of first connecting rod groups, a pair of second connecting rod groups, a pair of tailgate rod groups, a tailgate panel group and a pair of flips Power Department. The crank power group drives the pair of tailgate lever groups through the first and second connecting rod groups to rotate to one of a raised and retracted position and a lowered and extended position. When the first and second connecting rod groups are both connected It has a straight dead-point configuration, which can increase the structural strength. When in the ascending and retracting position, the turning power unit telescopically drives the tailgate panel assembly, so that the tailgate panel assembly can be rotated to at least one upright and retracted position and a lowered load-bearing position One of them. Therefore, this case combines the advantages of dead-point configuration design to improve the strength of the support structure, which is beneficial to the application of the motor reducer on the market, simple structure and low manufacturing cost, can be equipped with electronic sensing elements to facilitate stroke control, and can be used to reduce costs by using electric gear cylinders.

Description

Truck tailgate lifting device driven by crank rocker arm

The present invention relates to a truck tailgate lifting device driven by a crank rocker arm, in particular to a motor reducer that has a dead-point configuration design to improve the strength of the support structure, is beneficial to the application of the motor reducer on the market, has simple structure and low manufacturing cost, and can be equipped with electronic sensors. The measuring element is easy to control the stroke, and the electric gear cylinder can be used to reduce the cost of the truck tail gate lifting device.

The transportation industry is an important part of maintaining the prosperous operation of the industrial and commercial economy. However, in the face of strong competitive pressure, how to reduce freight costs, increase the volume of cargo, the convenience of cargo loading, and the low maintenance rate of the car body will be the transportation industry to maintain profitability The main consideration of advantage. Therefore, we must focus on innovation and development, and improve the precision of mechanical manufacturing and assembly, so that at the technical level, there will be breakthrough and unique advantages. The rear body of a traditional truck is at a certain height from the ground, which makes loading and unloading goods quite inconvenient. If a tailgate lifting mechanism is installed at the rear of the body (that is, the rear body), it will be convenient to load and unload goods and improve the efficiency of loading and unloading goods. In order to facilitate cargo loading and unloading, the tailgate of trucks must have two movements, namely lifting and turning movements. Therefore, the tailgate of large trucks is mostly equipped with double hydraulic cylinders or four hydraulic cylinders (the number of hydraulic cylinders is large), but small The tailgate of a truck is mostly equipped with a single hydraulic cylinder or a double hydraulic cylinder (the number of hydraulic cylinders is less), and the cam mechanism can make the truck tailgate move up and down.

The traditional design using hydraulic cylinders has the following shortcomings:

1. The cost of hydraulic drive system is too high.

2. The force arm of the hydraulic drive is too small, and a relatively large drive oil pressure must be used, which is prone to oil leakage and thus causes danger.

3. The structure is complex and the volume is too large (additional fuel tank, hydraulic pump, control valve body, ... and other complicated devices are required).

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

The object of the present invention is to provide a truck tail gate lifting device driven by a crank rocker arm, which has a dead-point configuration design to improve the strength of the support structure, is beneficial to the application of the motor reducer in the market, has a simple structure and low manufacturing cost, and can be equipped with electronics. The sensing element is easy to control the stroke, and the electric gear cylinder can be applied to reduce the cost. In particular, the problem to be solved by the present invention is that the conventional design of the tailgate of a truck uses a hydraulic cylinder, which has the following shortcomings:

1. The cost of hydraulic drive system is too high.

2. The force arm of the hydraulic drive is too small, and a relatively large drive oil pressure must be used, which is prone to oil leakage and thus causes danger.

3. The structure is complex and the volume is too large (additional fuel tank, hydraulic pump, control valve body, ... and other complicated devices are required).

The technical means to solve the above problems is to provide a crank rocker-driven truck tailgate lifting device, which includes: a pair of base parts for external fixation, each base part has a base height, a top The fixed place and the lower fixed place; a pair of crank arm parts are correspondingly arranged at the upper fixed part, and each crank arm part has a crank power unit, a first connecting rod group and a second connecting rod. Rod group; the crank power group is fixed to the corresponding upper fixing position, and is pivotally connected to one end of the first connecting rod group, and the other end of the first connecting rod group is pivotally connected to one end of the second connecting rod group ; A tailgate part is set corresponding to the lower fixed position, the tailgate part includes a pair of tailgate rod groups and a tailgate panel group; each tailgate rod group has a rod group pivot joint, A connecting rod pivot point and a plate group pivot point, the rod group pivot point is pivotally connected to the corresponding lower fixing point, the connecting rod pivot point is pivotally connected to the first The other end of the two connecting rod group; the tailgate plate group has a rotating shaft and a turning shaft, the plate group pivoting point is pivoted to the rotating shaft; a pair of turning power parts are attached to the tailgate part, Each of the turning power parts has a fixing device and a telescopic device; the fixing device is pivotally connected to the corresponding lower fixed position and is located below the corresponding rod pivot position, and the telescopic device is pivotally connected to the At the turning shaft, the fixing device and the telescopic device are structures that can relatively expand and contract to output power; thereby, when the pair of crank power sets rotate the pair of first connecting rod sets, the pair of first connecting rod sets pass through the pair of crank power sets. The second linkage group drives the pair of tailgate lever groups, and the pair of tailgate lever groups rotates around the pivoting position of the lever group as the axis, and then can rotate to at least one of a raised and retracted position and a lowered and extended position, And when in one of the ascending and retracting position and the descending and extending position, the first connecting rod group and the second connecting rod group are in a straight dead-point configuration, which can increase the structural strength; and when in When the ascending and retracting position, the fixing device and the telescopic device are relatively retractable, and then the tailgate panel group is driven through the turning shaft. The tailgate panel group is centered on the rotating shaft and can be rotated at least to an upright and retracted position. Position, one of the load-bearing positions.

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

Hereinafter, the present invention will be described in detail with the following examples and drawings:

10: Base

11: Upper fixation

12: Lower fixation

20: Crank and rocker arm

21: Crank power group

21A: reducer

22: The first connecting rod group

23: The second connecting rod group

30: Tailgate

31: Tailgate lever group

311: Pivot of rod group

312: Link Pivot

313: Board Group Pivot

32: Tailgate panel group

321: Hinge

322: Flip axis

40: Flip Power Department

41: Fixing device

42: Telescopic device

91: Rear

H: base height

D: Dead point configuration

P1: Ascend and retract position

P2: Descending extended position

P3: Descending position

PA: Stand up and retract position

PB: Put down the carrying position

PC: flip middle position

Figure 1A is a schematic diagram of the ascending and retracting of the present invention

Figure 1B is a schematic diagram from other angles of Figure 1A

Figure 2A is a schematic diagram of one of the stretching processes of the present invention

Figure 2B is a schematic diagram from other angles of Figure 2A

Figure 3A is a schematic diagram of the second stretching process of the present invention

Figure 3B is a schematic diagram from other angles of Figure 3A

Figure 4A is a schematic diagram of the third stretching process of the present invention

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

Figure 5A is a schematic diagram of the present invention to put down the load

Fig. 5B is a schematic diagram from other angles of Fig. 5A

Figure 6 is a partial enlarged schematic diagram of Figure 5B

Figure 7 is a schematic diagram of the dead-point configuration of the first and second link sets in a straight line when the tailgate rod assembly of the present invention is in the ascending and retracting position

Figure 8 is a schematic diagram of the dead-point configuration of the first and second connecting rod groups in a straight line when the tailgate rod group of the present invention is in the descending extended position

With reference to Figures 1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B, 5A, 5B and Figure 6, the present invention is a truck tailgate lifting device driven by a crank rocker arm , Which includes:

A pair of base parts 10 are used for external fixing, and each base part 10 has a base height H, an upper fixing part 11 and a lower fixing part 12.

A pair of crank and rocker arm portions 20 are correspondingly arranged at the pair of upper fixing positions 11, and each crank and rocker arm portion 20 has a crank power group 21, a first connecting rod group 22, and a second connecting rod group 23; The crank power group 21 is fixed to the corresponding upper fixing place 11, and is pivotally connected to one end of the first connecting rod group 22, and the first connecting rod group 22 is pivotally connected to the second connecting rod at the other end One end of group 23.

A tailgate 30 is provided corresponding to the lower fixing part 12, and the tailgate 30 includes a pair of tailgate rod groups 31 and a tailgate panel group 32. Each tailgate rod group 31 has a rod group pivot joint 311, a link pivot joint 312, and a plate group pivot joint 313. The pivot joint 311 of the rod group is pivotally connected to the corresponding lower fixing part 12, and the pivot joint 312 of the link rod is pivotally connected to the other end of the second link group 23. The tailgate plate group 32 has a rotating shaft 321 and a turning shaft 322, and the plate group pivot joint 313 is pivotally connected to the rotating shaft 321.

A pair of turning power parts 40 are attached to the tailgate part 30, and each turning power part 40 has a fixing device 41 and a telescopic device 42. The fixing device 41 is pivotally connected to the corresponding lower fixing part 12 and is located below the corresponding rod pivoting part 311. The telescopic device 42 is pivotally connected to the turning shaft 322, and the fixing device 41 and the telescopic device 42 are structures capable of relatively telescoping and outputting power.

Thereby, when the pair of crank power sets 21 rotate the pair of first connecting rod sets 22, the pair of first connecting rod sets 22 drive the pair of tailgate rod sets 31 through the pair of second connecting rod sets 23. The door rod group 31 rotates about the pivot joint 311 of the rod group, and can be rotated to at least one of a raised and retracted position P1, a lowered extension position P2, and when it is located at the raised and retracted position P1, the lowered position When one of the positions P2 is extended, the first connecting rod group 22 and the second connecting rod group 23 are both in a linear dead-point configuration D, which can increase the structural strength. And when in the ascending and retracting position P1, the fixing device 41 and the telescopic device 42 relatively expand and contract, and then drive the tailgate panel group 32 through the turning shaft 322, and the tailgate panel group 32 takes the rotating shaft 321 as the axis. , And can be rotated to at least one of a standing and retracting position PA and a lowering bearing position PB.

In practice, the base portion 10 is fixed to a rear end 91 (for example, the rear body of a known truck), and between the rear end 91 and the horizontal line (for example, the ground), the base height H (as shown in Fig. 6 Show).

The crank power unit 21 includes a speed reducer 21A, and the speed reducer 21A is connected to the crank power unit 21 for decelerating and driving the first connecting rod group 22.

In practical applications, if the motor reducer is used to directly drive the upper arm to rotate (this is a well-known technology in the related field, and will not be repeated), the output revolution of the motor reducer is only about 1.3rpm (10 seconds rise) ~ 1.86rpm ( 7 seconds rise), it is not easy to find this kind of motor reducer on the market. The present invention changes the well-known upper arm mechanism into a crank rocker arm mechanism (that is, the crank rocker arm part 20 in this case), and a motor reducer (also called a connecting rod reducer) can be used to drive the crank rocker arm mechanism to drive the tailgate of the truck (That is, the tailgate part of this case) rises and falls, and the output speed of the motor reducer can be increased to about 3.7rpm~5.25rpm. It is easier to find this kind of motor reducer on the market. For example: a gear reducer with a rated speed of 1720rpm motor with a reduction ratio of 402 (or 357), and a design with an output speed of 4.3rpm (or 4.8rpm). Therefore, it is beneficial to apply the motor reduction in the market Speed machine. The crank and rocker mechanism 20 of the present invention can be equipped with electronic sensing elements, so that the tailgate of the truck can automatically rise and fall, and it can be accurately positioned.

The turning power unit 40 can use an electric gear cylinder to reduce the cost.

The operation process of the present invention can be briefly described as follows:

[a] Action of the turning power unit: refer to Figures 1A, 1B, 2A, 2B, 3A, and 3B to activate the turning power unit 40, the fixing device 41 and the telescopic device 42 are relatively telescopic, and the telescopic device 42. Drive the tailgate panel group 32 through the turning shaft 322. The tailgate panel set 32 is rotated from the upright and retracted position PA to a turning center position PC, and then rotates to the lowered load bearing position. Location PB.

[b] Crank and rocker arm action: refer to Figs. 4A, 4B, 5A, 5B, and 6 to start the crank power unit 21. The crank power unit 21 decelerates through the reducer 21A and then drives the first connection The rod group 22, the first connecting rod group 22 transmits the tailgate rod group 31 through the second connecting rod group 23, the tailgate rod group 31 rotates around the pivot point 311 of the rod group, and then rises from the The retracted position P1 (as shown in Figures 3A and 3B) is rotated to a lowering position P3 (as shown in Figures 4A and 4B), and then rotated to the descending and extending position P2, and when in the ascending and retracting position When one of the positions P1 and the descending and extending position P2, the first link set 22 and the second link set 23 are both in a linear dead-point configuration D (see Figures 7 and 8), and can Improve structural strength.

The key point of the present invention is that when the tailgate rod group 31 is in the ascending and retracting position P1 (as shown in Figures 3A, 3B and 7), it must bear the force generated by the tailgate panel group 32 turning over (familiar with this) Those skilled in the art know that the force generated by the turning of the tailgate panel group 32 is great), and when the tailgate rod group 31 is located in the lowered and extended position P2, it must be able to withstand the force of pulling the tailgate panel group 32 up (sometimes It may weigh several hundred kilograms). Therefore, the first connecting rod group 22 and the second connecting rod group 23 are both in a straight dead-point configuration D (see Figure 8), which can increase the structural strength and make The tailgate rod group 31 can bear gravity.

Of course, by controlling the crank power unit 21 and the turning power unit 40 to operate in reverse, it can return to the original position. The advantages and effects of the present invention are as follows:

[1] The dead-point configuration design improves the strength of the support structure. The present invention is provided with a first connecting rod group and a second connecting rod group. When the tailgate rod group rotates to the ascending and retracting position and the descending and extending position, the first connecting rod group and the second connecting rod group are in a straight line. The dead-point configuration can greatly increase the strength of the supporting structure of the entire tailgate. Therefore, the dead-point configuration design improves the strength of the supporting structure.

[2] Facilitate the application of motor reducers on the market. For those who know this skill, if the motor reducer is used to directly drive the upper arm to rotate (this is a well-known technology known in the related field, and will not be repeated), the output revolution of the motor reducer is only about 1.3 rpm (10 seconds rise) ~1.86rpm (7 seconds rise), it is not easy to find this kind of motor reducer on the market. The present invention changes the well-known upper arm mechanism into a crank-rocker arm mechanism (that is, the crank-rocker arm part of this case), which can use a motor reducer (also called a connecting rod reducer) to drive the crank-rocker arm mechanism, and then drive the tailgate of the truck ( That is, the rising and falling of the tailgate in this case, the output speed of the motor reducer can be increased to 3.7rpm~5.25rpm at this time, and it is easier to find this kind of motor reducer in the market. For example: a gear reducer with a rated speed of 1720rpm motor with a reduction ratio of 402 (or 357), and a design with an output speed of 4.3rpm (or 4.8rpm). Therefore, it is beneficial to apply the motor reducer on the market.

[3] Simple structure and low manufacturing cost. The motor speed reducer is used to drive the crank and rocker arm mechanism, thereby driving the lifting and lowering of the tailgate of the truck, which can achieve the advantages of simple structure and low manufacturing cost. Therefore, the structure is simple and the manufacturing cost is low.

[4] It can be equipped with electronic sensing components to facilitate control of the stroke. The crank and rocker arm mechanism of the present invention can be matched with electronic sensing elements, so that the tailgate of the truck can automatically rise and fall, and it can be accurately positioned. Therefore, it can be matched with electronic sensing elements to facilitate the control of the stroke.

[5] Electric gear cylinders can be used to reduce costs. The turning power part of the present invention can use an electric gear cylinder to drive the tailgate panel group to flip, which will make the turning operation of the tailgate panel group simpler and cheaper. Therefore, electric gear cylinders can be used to reduce costs.

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

10: Base

11: Upper fixation

12: Lower fixation

20: Crank and rocker arm

21: Crank power group

21A: reducer

22: The first connecting rod group

23: The second connecting rod group

30: Tailgate

31: Tailgate lever group

311: Pivot of rod group

312: Link Pivot

313: Board Group Pivot

32: Tailgate panel group

321: Hinge

322: Flip axis

40: Flip Power Department

41: Fixing device

42: Telescopic device

H: base height

D: Dead point configuration

P2: Descending extended position

PB: Put down the carrying position

Claims (4)

A lifting device for the tailgate of a truck driven by a crank rocker arm, comprising: a pair of base parts for external fixation, each base part having a base height, an upper fixing part and a lower fixing part; For the crank and rocker arm parts, they are correspondingly arranged at the upper fixed position. Each crank and rocker arm part has a crank power group, a first connecting rod group and a second connecting rod group; the crank power group is Fixed to the corresponding upper fixing position, and pivotally connected to one end of the first link group, the other end of the first link group is pivotally connected to one end of the second link group; a tailgate part is connected to It should be set to the lower fixed position. The tailgate includes a pair of tailgate rod groups and a tailgate panel group; each tailgate rod group has a rod group pivot joint, a connecting rod pivot joint and a The pivotal joint of the plate group, the pivotal joint of the rod group is pivotally connected to the corresponding lower fixing position, the pivotal joint of the connecting rod is pivotally connected to the other end of the second connecting rod group; the tailgate plate group has At a rotating shaft and a turning shaft, the pivotal joint of the plate assembly is pivotally connected to the rotating shaft; a pair of turning power parts are attached to the tailgate part, and each turning power part has a fixing device and a telescopic device ; The fixing device is pivotally connected to the corresponding lower fixing place, and is located below the corresponding rod pivoting place, the telescopic device is pivotally connected to the turning shaft, the fixing device and the telescopic device can be opposite A structure that expands and contracts to output power; thereby, when the pair of crank power sets rotate the pair of first connecting rod sets, the pair of first connecting rod sets drive the pair of tailgate rod sets through the pair of second connecting rod sets, the The tailgate lever group rotates around the pivoting position of the lever group as the axis, and can be rotated to at least one of an ascending and retracting position and a descending and extending position, and when in the ascending and retracting position and the descending and extending position. In one case, the first connecting rod group and the second connecting rod group are in a linear dead-point configuration, which can increase the structural strength; and when in the ascending and retracting position, the fixing device and the telescopic device Relatively telescopic, and then drive the tailgate panel group through the turning shaft, the tailgate panel group Taking the rotating shaft as the axis, it can be rotated to at least one of a standing and retracting position and a lowering bearing position. The crank rocker arm-driven tailgate lifting device of a truck according to claim 1, wherein the base portion is used to be fixed to a rear of a vehicle, and the height of the base is provided between the rear of the vehicle and the horizontal line. The crank-rocker arm-driven tailgate lifting device of a truck according to claim 1, wherein the crank power group includes a reducer connected to the crank power group for driving the first connecting rod group at a reduced speed . The crank rocker arm-driven truck tail gate lifting device according to claim 1, wherein the turning power unit is an electric gear cylinder.

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