JP2000289477A - Driving device for trailer auxiliary leg - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving device for a trailer auxiliary leg, capable of not only reducing labor and shortening operation time but also reducing costs and weight. SOLUTION: In the driving device of a trailer auxiliary leg for elongating/ contacting a pair of left and right auxiliary legs to be elongated/contracted in the front side of a load carrying platform, an auxiliary leg 3 is elongated/ contracted by an input shaft 12 operated by a crank handle 13, a gear reduction 10, bevel gears 35 and 36, and a screw 31 and a nut 37. Also, a joint part 17 is set in one end of the middle shaft 16 of the gear reduction 10, the output shaft 51 of an air motor 50 is fixed in the joint part 17 while no load is placed on the auxiliary leg 3, and the auxiliary leg 3 is elongated/contracted by the air motor 50, and the driving device is not always provided with the air motor 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trailer used for transporting cargo such as marine containers, and more particularly, to a driving device for extending and retracting left and right auxiliary legs provided on the front side of a cargo bed. .

[0002]

2. Description of the Related Art Generally, a trailer for transporting luggage is provided with a pair of extendable left and right auxiliary legs at the front side of a luggage carrier for supporting the luggage carrier in a stable state by contacting the ground with the ground when disconnecting from a tractor. . Conventionally, the extension and contraction operation of the auxiliary leg is manually performed by rotating a crank handle via a gear reducer. However, when the vehicle travels, the grounding plate of the auxiliary leg needs to be considerably separated from the ground, and even if a gear reducer having high-speed and low-speed switching is used, a grounding position where the grounding plate of the auxiliary leg is grounded, In order to extend and retract between the retracted position and the storage position raised from the ground, even if there is no load (low load state), it takes considerable time and effort to operate the steering wheel. Therefore, in order to reduce the labor and shorten the operation time, apart from the handle operation system, a drive system using a relatively low-torque air motor for causing the extension / contraction operation of the auxiliary leg particularly in a no-load state. Has been proposed. An example of such a driving device is disclosed in Japanese Utility Model Publication No. 49-46096. According to the driving device described in the publication, the extension and contraction operation in a no-load state, in which the grounding plate of the auxiliary leg is moved between the storage position and the grounding position, can be performed easily in a short time.

[0003]

However, the driving device of the trailer auxiliary leg with an air motor described in the above publication has a structure in which the air motor is fixed to the fixing member of the auxiliary leg as a matter of course. That is, since the air motor is assembled as one component of the driving device, there is a problem that the driving device becomes expensive and the weight increases.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to reduce the labor and operation time as well as to reduce the cost and weight. It is an object of the present invention to provide a driving device for a trailer auxiliary leg capable of reducing the weight of a trailer.

[0005]

In order to achieve the above object, a driving device for an auxiliary leg for a trailer according to the present invention has a configuration as described in each of the claims. Therefore, according to the first aspect of the present invention, when the auxiliary leg is not loaded, the output shaft of the motor is connected to the joint of the second input shaft,
By driving the motor, the auxiliary leg can be extended and contracted via the gear reducer and the power transmission means, and in a load state, the first input shaft is rotated using the operation handle,
The auxiliary leg can be extended and contracted from the gear reducer via the power transmission means. That is, the auxiliary leg can be extended and contracted by selectively using the manual and the motor according to the load state of the auxiliary leg,
Reduced labor and reduced operating time are achieved. On the other hand, when the auxiliary leg is not used, the motor can be detached from the second input shaft and set. Generally, an auxiliary leg of a trailer is used when the trailer is separated from the tractor, and is lifted off the ground during transportation connected to the tractor and held in a storage position. Therefore,
The use place (time) of the auxiliary leg is limited to factories and warehouses where cargo is loaded, and ports and ferries where cargo is unloaded at the destination. Therefore, by enabling the motor to be connected to the input shaft as in the present invention,
A motor is provided for each drive unit of the auxiliary leg because it is possible to operate the auxiliary leg using the motor provided on the tractor, which is the place where the auxiliary leg is operated, the place to load or unload luggage, or the tractor The cost and weight of the driving device for the auxiliary leg are reduced.

When the intermediate shaft of the gear reducer also serves as the second input shaft, the number of shafts is reduced as compared with a case where the input shaft is separately set. As a result, the structure can be simplified.

According to the third aspect of the present invention, when the motor is mounted on the second input shaft, the first input shaft is separated from the gear reducer. That is, to attach the motor to the second input shaft, the first input shaft must be separated from the gear reducer. Therefore, when the auxiliary leg is extended and retracted by using the motor, it is possible to prevent the operation handle from rotating by mistake and to improve the safety of the worker.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view of a trailer having auxiliary legs, FIG. 2 is a side view of the auxiliary legs, FIGS. 3 and 4 are front views of the auxiliary legs, respectively, FIG. 5 is a cross-sectional view illustrating a driving device of the auxiliary legs, and FIG. FIG. 5 is a cross-sectional view illustrating a switching mode of a first input shaft. As shown in FIG. 1, a trailer 1 used for transporting luggage includes a pair of left and right extendable auxiliary legs 3 on the front side of a loading platform 2. As shown in FIGS. 2 to 4, the auxiliary leg 3 is a rectangular tube-shaped fixed leg 4 fixed to the bed 2 side of the trailer 1.
And a telescopic leg 5 in the form of a square tube which is vertically movably fitted into the fixed leg 4. A grounding plate 6 is provided at the lower end of the telescopic leg 5.

A gear reducer 10 is provided on one of the left and right auxiliary legs 3. The gear box 11 of the gear reducer 10 is fixed to the upper end of the fixed leg 4, and includes an input shaft 12, an intermediate shaft 16, and an output shaft 1.
8 and three mutually parallel axes. In the present embodiment, the input shaft 12 is a first input shaft used for expansion and contraction operation under a load (high load) state of the auxiliary leg 3, and is rotatable with respect to the gear box 11 and in the axial direction. It is slidably mounted. The input shaft 12 has one end protruding outside the gear box 11, and a crank handle 13 as an operation handle for manually rotating the input shaft 12 is foldably attached to the protruding end by a pin 14. I have. Therefore, the operating handle 1
3 is an input shaft 12 as shown in FIG.
When not in use, as shown in FIG. 2, it is folded to a storage position along the auxiliary leg 3 and is held by a locking piece 16 provided on the fixed leg 4 of the auxiliary leg 3, as shown in FIG. You.

On the other hand, the intermediate shaft 16 is arranged side by side with the input shaft 12, and one end on the same side as the input shaft 12 protrudes outside the gear box 11, and the protruding end outputs a rotational force. A joint 17 to which an output shaft 51 of, for example, a portable air motor 50 can be attached as a power device capable of being formed is formed (see FIGS. 5 and 6). That is, in the present embodiment, when the air motor 50 is mounted on the intermediate shaft 16 and driven, the intermediate shaft 16 is used for the extension and retraction operation of the auxiliary leg 3 in a no-load (low load) state. Is also used. The joint 17 is formed of, for example, a hexagonal square shaft. The joint 17 is provided with an air motor 50 as shown in FIG.
(Socket) 5 fixed to the output shaft 51
2 can be fitted.

FIGS. 5 and 6 are cross-sectional views showing a driving device including a gear reducer 10 for moving the auxiliary leg 3 in and out, a power transmission means, and the like. 5 and 6, for convenience, the input shaft 12 is shown as being expanded downward.
In practice, the input shaft 12 and the intermediate shaft 16 are arranged side by side as shown in FIG. As shown in the figure, a single two-stage gear 19 having a small gear 19a and a large gear 19b integrally fixed to the first input shaft 12, and three gears 20, 21,. 22 is fixed, and one output gear 23 is fixed to the output shaft 18.

The two-stage gear 19 on the input shaft 12
Is moved by the sliding operation of the input shaft 12 in the axial direction, and is engaged with one of the two large and small gears 20 and 21 on the intermediate shaft 16 so that the rotational position can be inputted to the operating position (solid line or FIG. 6). The position can be switched between a position shown by a virtual line) and a rest position (the position shown in FIG. 5) in which the engagement is released. Further, another small-diameter gear 22 on the intermediate shaft 16 is configured to always mesh with a larger-diameter output gear 23. The two-stage gear 19 displaced by the input shaft 12 is moved by a positioning mechanism 24 having three detent grooves 24a provided on the input shaft 12 and a detent ball 24b engageable with any of the detent grooves 24a. It is positioned at the switching position. The detent ball 24b is provided on the gear box 11 side and is spring-biased in the engaging direction.

Further, the input shaft 12 is provided with a regulating member 25 which prevents or enables the attachment of the air motor 50 to the joint portion 17 of the intermediate shaft 16. This regulating member 25
The two cylindrical portions 25a and 25b parallel to each other at a predetermined interval are formed in a substantially eyeglass shape in which the cylindrical portions 25a and 25b are connected by a bar 25c.
Is rotatably fitted to the outer periphery of the protruding portion of the intermediate shaft 16 and is stopped by a stopper pin 26 so as not to move in the axial direction, and the other cylindrical portion 25b is rotatable around the outer periphery of the protruding portion of the intermediate shaft 16 from the gear box 11. And slidably fitted in the axial direction. Then, when the input shaft 12 is moved to the operating position, the regulating member 25 moves, as shown in FIG.
b moves along the intermediate shaft 16 and covers the joint portion 17 so that the mounting of the air motor 50 is obstructed, and the input shaft 12
Is moved to the rest position, as shown in FIG.
The joint 17 is exposed so that the air motor 50 can be mounted.

Next, a telescopic structure of the auxiliary leg 3 will be described with reference to FIG. However, since the left and right auxiliary legs 3 have the same structure, only one is shown and the other is not shown. As shown in the figure, the fixed leg 4 has a screw 31 extending in the telescopic leg 5, and the screw 31 is rotated by a screw holder 32 fixed to an upper portion in the fixed leg 4 via a bush 33 and a thrust bearing 34. Supported as possible. The screw 31 is connected to the output shaft 1
8 from the driving bevel gear 35 fixed to the
Is rotated via a driven bevel gear 36 fixed to the upper end of the gear.

A screw 37 is screwed with a nut 37 supported by the telescopic leg 5. Therefore, the telescopic leg 5 moves up and down, that is, expands and contracts together with the nut 37 by the clockwise or counterclockwise rotation of the screw 31.
Note that the lower surface side of the nut 37 is formed in a spherical shape,
It is supported by the spherical portion of the ring member 38 fixed in the telescopic leg 5, and the upper surface is formed as a substantially flat surface.
A part of the wall surface of the telescopic leg 5 is supported by an end of a projection 39 formed by cutting and raising inward. The two bevel gears 35 and 36 and the screw 31 and the nut 37 screwed thereto convert the rotational motion of the gear reducer 10 into a linear motion and transmit it to the telescopic leg 5 of the auxiliary leg 3. Means are configured. 3 and 4
As shown in the figure, an output shaft 18 of one auxiliary leg 3 provided with the gear box 11 and an output shaft 18 (in a sense, an input shaft) of the other auxiliary leg 3 having no gear box 11 are interlocking shafts 39. Are connected via

The driving device of the auxiliary leg for a trailer according to the present embodiment is configured as described above. When the trailer 1 is connected to the tractor via the connecting device, the auxiliary leg 3 is reduced. The ground plate 6 is stored at a predetermined height from the ground. In this state, the input shaft 12 is pushed into the rest position shown by the solid line in FIG. 5 and is substantially separated from the gear reducer 10. Further, the cylindrical portion 25b of the regulating member 25 is moved to the center side of the output shaft 16, and the joint portion 17 is exposed. Further, the crank handle 13 is folded to the storage position shown in FIG.

The extension and contraction operation of the auxiliary leg 3 in a no-load state, that is, the extension and contraction operation between the retracted position where the grounding plate 6 is pulled up from the ground and the grounding position where the grounding plate 6 abuts on the ground is an intermediate shaft. 16 is used as the second input shaft. In this case, as shown in FIG.
An adapter 52 fixed to the output shaft 51 of the air motor 50 is fitted to the joint portion 17 of FIG. And the air motor 5
When the 0 switch 53 is operated to the forward rotation direction or the reverse rotation side, the rotational force of the air motor 50 is changed from the intermediate shaft 16 to the gear 22,
It is amplified (decelerated) and transmitted to the output shaft 18 via the output gear 23, and the bevel gears 35, 36 of the left and right auxiliary legs 3 are transmitted therefrom.
, The screw 31 is rotated. Therefore, the nut 37 moves downward or upward, and the left and right telescopic legs 5 are extended. The air motor 50 is rotated using pressurized air as a drive source, and has a relatively low torque. As described above, the extension and contraction operation of the auxiliary leg 3 in a no-load state can be easily performed in a short time by using the air motor 50, so that the labor and the operation time can be reduced.

On the other hand, an operation of lifting the bed 2 of the trailer 1 is manually performed using the input shaft 12 in a load state in which the ground plate 6 is grounded to the ground. That is, as shown in FIG. 3, by operating the crank handle 13 to be pulled out to the use position and the input shaft 12 to be pulled out to the front, as shown in FIG. Either of the small gear 19a or the large gear 19b is meshed with the large-diameter gear 21 or the small-diameter gear 20 of the intermediate shaft 16, and a reduction ratio of either high or low is selected. Then, by rotating the crank handle 13, the gear reducer 10, bevel gears 35 and 36, screw 31, nut 3
The telescopic leg 5 can be extended through 7 and the carrier 2 can be lifted.

As described above, according to the present embodiment, when the auxiliary leg 3 is in a no-load state, the auxiliary leg 3 can be expanded and contracted in a short time by using the air motor 50, and in a loaded state, it can be manually operated by using the crank handle 13. Can be extended and retracted. In this case, the air motor 50 is attached to the joint 17 provided on the intermediate shaft 16 when the auxiliary leg 3 is extended and retracted, and the air motor 50 can be detached when not in use. There is no need to equip the air motor 50. For this reason, the driving device is inexpensive and the weight is reduced. In general, the extension and retraction operation of the auxiliary leg 3 of the trailer 1 is performed in connection with disconnection or connection of the trailer 1 from a tractor at a loading place or unloading place. For this reason, when the configuration as in the present embodiment is adopted, the air motor 50 may be provided at a loading place or unloading place for luggage, and the drive source of the air motor 50 is, for example, the trailer 1. It is possible to use a compressor or the like provided in a receiver tank or a place for loading or unloading luggage, and the tractor may be equipped with an air motor 50 and used.

Further, in this embodiment, the regulating member 25 is provided on the input shaft 12, and the air motor 50 is attached to the intermediate shaft 16 only when the input shaft 12 is switched to the rest position where the rotational force cannot be input. And can be used as a second input shaft. For this reason, at the time of extension / contraction operation of the auxiliary leg 3 using the air motor 50, the crank handle 13 is prevented from rotating carelessly, and the possibility that the crank handle 13 hits the air motor 50 or an operator can be avoided. . Also, the intermediate shaft 16
Is also used as the second input shaft, so that the structure of the gear reducer 10 can be simplified as compared with a case where an input shaft is separately set.

In this embodiment, the air motor 50
However, the use of an electric motor does not matter. Also, the intermediate shaft 16 of the gear reducer 10 is
Although the input shaft is also used, it can be changed to a separately set configuration. Further, the joint 17 is not limited to the square axis, and may be of another type such as a flange type.

[0022]

As described above in detail, according to the driving apparatus for a trailer auxiliary leg according to the present invention, the labor and the operation time can be reduced, and the cost and weight can be reduced. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a trailer provided with auxiliary legs.

FIG. 2 is a side view of an auxiliary leg.

FIG. 3 is a front view of the auxiliary leg, showing a handle operation mode.

FIG. 4 is a front view of the auxiliary leg, showing a driving mode by an air motor.

FIG. 5 is a sectional view showing a driving device of the auxiliary leg.

FIG. 6 is a cross-sectional view illustrating a switching mode of an input shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Trailer 3 ... Auxiliary leg 4 ... Fixed leg 5 ... Expansion leg 6 ... Grounding plate 10 ... Gear reduction gear 12 ... Input shaft 16 ... Intermediate shaft (second input shaft) 17 ... Coupling part 25 ... Regulation member 31 ... Screw 35, 36 ... bevel gear 37 ... nut 50 ... air motor 51 ... output shaft

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshihiro Matsukawa 102, Kamihama-cho, Handa-shi, Aichi Transport Equipment Co., Ltd. F-term (reference) 3D026 EA05 EA19 3D039 AA01 AA03 AB23 AC21 AD11

Claims (3)

[Claims] 1. A trailer auxiliary leg drive device for extending and retracting a pair of extendable left and right auxiliary legs provided on the front side of a cargo bed, comprising: a first and a second two parallel legs. An input shaft, a gear reducer rotated by an external force input through both input shafts, and power transmission means for converting the rotational motion of the gear reducer into linear motion and transmitting the linear motion to the telescopic leg of the auxiliary leg. An operation handle for manual operation is provided at one end of the first input shaft;
A drive device for a trailer auxiliary leg, wherein a joint portion to which an output shaft of a motor can be attached is provided at one end of the second input shaft. 2. The drive device for an auxiliary leg for a trailer according to claim 1, wherein the second input shaft is an intermediate shaft of a gear reducer. 3. The drive device for an auxiliary leg for a trailer according to claim 1, wherein the first input shaft and the second input shaft are provided close to each other, and the first input shaft is a shaft. By sliding in the direction, it is configured to be switchable between an operating position where torque can be input to the gear reducer and a rest position where input is not possible, and the first input shaft is provided with the first input shaft. Of a trailer auxiliary leg provided with a regulating member that prevents the motor from being mounted on the joint portion of the second input shaft when the switch is switched to the operating position, and allows the motor to be mounted when the switch is switched to the rest position. Drive.