JP2005280389A - Landing gear device and outrigger device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a landing gear device having a simple structure and capable of obtaining a stable parking state regardless of a road surface inclination.
A landing gear device 1 has a crank handle 6 as an input shaft. The crank handle 6 is connected to the auxiliary leg 2 and the output shaft of the auxiliary leg 3 via a differential gear in the differential gear box 4. By turning the crank handle 6, the leg portions 22 and 32 of the two auxiliary legs 2 and 3 are simultaneously lowered. When the sand shoe 33 of the leg 32 is first grounded on the inclined road surface 9, the differential gear differential function works, and thereafter, only the leg 22 of the auxiliary leg 2 is lowered. When the sand shoe 23 of the leg portion 22 comes into contact with the ground, both auxiliary legs 2 and 3 support the trailer.
[Selection] Figure 6

Description

  The present invention relates to a landing gear device and an outrigger device.

  In a semi-trailer that transports a trailer by a tractor, a landing gear device is generally known as a device that can separate the trailer from the tractor and park the separated trailer in a stable state. As a basic structure of the landing gear device, for example, there is one disclosed in Japanese Patent No. 3054759. This landing gear device is composed of two auxiliary legs that can be extended and contracted, and by manually rotating the crank handle, the two auxiliary legs are simultaneously extended and retracted, and the front part of the trailer is respectively lowered on the left and right sides by these auxiliary legs. Supported by. Further, in the landing gear device disclosed in Japanese Patent Laid-Open No. 7-309216, the extension / contraction speed of the auxiliary leg is switched in two stages.

  However, in these landing gear devices, since the auxiliary legs are expanded and contracted at the same time, the trailer is in a stable state where the ground contact height of the auxiliary legs (distance from the vehicle body to the road surface) is different due to the inclination of the road surface. It was difficult to park.

  Thus, for example, Japanese Patent Application Laid-Open No. 11-171477 discloses a technique for individually extending and contracting the left and right auxiliary legs. In this publication technique, by automatically controlling the height of each auxiliary leg of the outrigger device, the trailer can be parked in a stable state even at a location where the ground contact height of the auxiliary leg is different. .

Japanese Patent No. 3054759 JP-A-7-309216 JP-A-11-171477 Japanese Patent No. 2542541

  However, Japanese Patent Application Laid-Open No. 11-171477 requires a large-scale configuration such as a hydraulic mechanism, a sensor, and a control circuit, which may lead to a complicated structure and an increase in cost.

  The present invention has been made in view of the above-described problems, and has a simple structure and a landing gear device that can easily obtain a stable parking state even at a place where the ground contact height of the auxiliary leg is different. And an outrigger device.

  The present invention is a landing gear device for parking a trailer of a semi-trailer, and includes an input shaft, two auxiliary legs each having a vertically movable leg, two output shafts, a differential gear, Is provided. The two auxiliary legs are spaced apart. The two output shafts are connected to each of the legs, and rotate as the legs move up and down. The differential gear connects the input shaft and the two output shafts, and transmits the rotational force of the input shaft to the two output shafts, respectively.

  In the above configuration, when the input shaft is rotated in a predetermined direction, the rotational force is transmitted to each output shaft via the differential gear, and the two legs move downward simultaneously. At this time, if the ground contact height of the auxiliary leg (distance from the vehicle body to the road surface) is different due to the slope of the road surface, one leg portion is grounded first and receives a load. In this state, if the input shaft is further rotated, the differential gear differential function acts and the grounded leg remains stopped (the rotation of the output shaft connected to one leg stops), while the other The rotational force is transmitted only to the other leg, and the other leg moves downward. The two legs support the trailer in a state where the other leg is grounded. In addition, when the two legs are in contact with each other, both legs receive a load, and by further rotating the input shaft, the rotational force is transmitted again to each output shaft via the differential gear. Both book legs move downward. Thereby, the area | region between two auxiliary legs of a trailer can be moved upwards.

  Further, the landing gear device may be provided with a diff lock means for diff-locking the differential gear.

  In such a configuration, if the differential function of the differential gear is activated due to a difference in the load received by each leg after both legs are grounded, the differential gear difference is activated by operating the differential lock means. The movement can be limited (stopped). For this reason, the two legs can be reliably moved up and down simultaneously, and the region between the two auxiliary legs of the trailer can be reliably translated upward.

  The two auxiliary legs may be arranged on both sides in the vehicle width direction.

  Further, the differential gear may be disposed in the vicinity of one auxiliary leg.

  Moreover, you may comprise the outrigger apparatus mounted in a vehicle similarly to the said landing gear apparatus.

  The present invention can absorb a difference in ground contact height with a simple structure, and can obtain a stable state regardless of the slope of the road surface.

  FIG. 1 is a perspective view showing a configuration of a landing gear device which is an embodiment of an auxiliary leg device of the present invention. The landing gear device 1 is mainly composed of two auxiliary legs 2 and 3, a differential gear box 4, a connecting bar 5, a crank handle 6, and a differential lock handle 7. Here, an example is shown in which the auxiliary legs 2 and 3 are arranged on both sides in the vehicle width direction, specifically, the auxiliary legs 2 are arranged on the left side of the vehicle and the auxiliary legs 3 are arranged on the right side of the vehicle.

  The auxiliary leg 2 has a cylindrical case 21 that is fixed to the trailer 8 (shown in FIG. 4), and a leg portion 22 that is inserted into the case 21 so as to be movable up and down. As the leg portion 22 moves up and down in the case 21, the entire auxiliary leg 2 expands and contracts. Then, the auxiliary shoe 2 supports the trailer 8 by the landing of the sand shoe 23 attached to the lower end of the leg portion 22. Similarly, the auxiliary leg 3 has a cylindrical case 31 and a leg portion 32 inserted into the case 31 so as to be movable up and down. As the leg portion 32 moves up and down in the case 31, the entire auxiliary leg 3 expands and contracts. Then, when the sand shoe 33 attached to the lower end of the leg portion 32 is landed, the auxiliary leg 3 supports the trailer 8.

  The auxiliary leg 2 and the auxiliary leg 3 are connected to each other in parallel with each other via the connecting bar 5 so as to have the same height. The length of the connecting bar 5 is set to be approximately the same as the vehicle width of the trailer 8. An output shaft 34 to be described later is inserted into the connecting bar 5.

  A differential gear box 4 is provided at a portion where the auxiliary leg 2 is connected to the connecting bar 5. One end portion of a crank handle 6 as an input shaft and one end portion of a differential lock handle 7 are inserted into the differential gear box 4. The crank handle 6 is rotatably supported with respect to the differential gear box 4. The crank handle 6 is supported so as to be allowed to rotate within a predetermined range with respect to the differential gear box 4 and to be movable along its rotation axis. By operating the crank handle 6 and the differential lock handle 7, the expansion and contraction of the auxiliary leg 2 and the auxiliary leg 3 (the vertical movement of the leg portions 22 and 32) can be adjusted.

  FIG. 2 is a longitudinal sectional view showing the structure of the auxiliary leg 2, and is a view seen from the front side of FIG. A leg portion 22 is slidably inserted into the case 21 of the auxiliary leg 2. A shaft 24 extending along the center line is rotatably disposed in the case 21. A screw 24 a is formed on the outer peripheral surface of the shaft 24, and the screw 24 a is screwed with a screw 22 a formed on the leg portion 22. A bevel gear 25 is fixed to the upper end of the shaft 24.

  An output shaft 27 extending from the differential gear box 4 is inserted into the upper side surface of the case 21. A bevel gear 26 is fixed to the tip of the output shaft 27, and the bevel gear 26 meshes with the bevel gear 25.

  With such a configuration, when the output shaft 27 rotates, the rotational force is transmitted to the shaft 24 via the bevel gear 26 and the bevel gear 25. Depending on the direction of rotation of the output shaft 27 and the shaft 24, the leg portion 22 screwed with the shaft 24 moves upward or downward.

  In addition, since the basic structure of the one auxiliary leg 3 is the same as that of the auxiliary leg 2, the description is omitted here.

  FIG. 3 is a cross-sectional plan view showing a schematic configuration in the differential gear box 4. A differential gear 40 is provided in the differential gear box 4. The differential gear 40 has a differential case 41, a main gear 42, two pinion gears 43 and 44, and two side gears 45 and 46. The pinion gears 43 and 44 and the side gears 45 and 46 are bevel gears.

  The main gear 42 is rotatably attached independently to the output shaft 27 on the auxiliary leg 2 side. The main gear 42 meshes with a gear 6 a fixed to one end of the crank handle 6. A cylindrical differential case 41 is fixed to the main gear 42. The differential case 41 is provided with a shaft 41a, and pinion gears 43 and 44 are rotatably attached to the shaft 41a independently of the shaft 41a.

  The side gear 45 is fixed to the end of the output shaft 27 and is attached so as to mesh with both the pinion gears 43 and 44 at the same time. The other side gear 46 is fixed to the end of the output shaft 34 of the auxiliary leg 3 and is attached so as to mesh with both the pinion gears 43 and 44.

  A disc-shaped stopper board 47 is fixed to the end face of the differential case 41 opposite to the main gear 42. A plurality of dogs 47 a are formed on the right side surface of the stopper board 47 in the drawing. A clutch panel 48 is attached to the output shaft 34 so as to face the stopper 47. The clutch disc 48 is slidably fitted to the groove 34a of the output shaft 34 at its inner peripheral surface. That is, the clutch panel 48 can rotate integrally with the output shaft 34 and can slide in the left-right direction in the drawing. A plurality of dogs 48 a that can mesh with the dogs 47 a of the stopper plate 47 are formed on the left side of the clutch plate 48 in the drawing.

  An annular groove 48 b is formed on the outer peripheral surface of the clutch board 48. The front end 7a of the differential lock handle 7 is slidably fitted in the groove 48b. The differential lock handle 7 is supported by a guide 49 and is slidable in the left-right direction in the figure. In a normal state, the stopper portion 7b of the differential lock handle 7 is engaged with the slit 49a of the guide 49, whereby the clutch disc 48 and the stopper disc 47 are held in a separated state. From this state, by rotating the diff lock handle 7 to remove the stopper portion 7b from the slit 49a and pulling the diff lock handle 7 to the left in the figure, the tip end portion 7a of the diff lock handle 7 moves toward the stopper board 47, The clutch board 48 is pushed to the left in the figure to engage the dog 48a of the clutch board 48 and the dog 47a of the stopper board 47.

  In the differential gear box 4 having such a configuration, the main gear 42 of the differential gear 40 rotates through the gear 6a by manually turning the crank handle 6. At the same time, the differential case 41 rotates. At this time, when no load is applied to the left and right output shafts 27 and 34, or a similar load is applied, a differential is generated between the pinion gears 43 and 44 and the side gears 45 and 46. (The differential function of the differential gear 40 does not work), so the output shafts 27 and 34 rotate integrally in the same direction.

  On the other hand, when only one of the output shafts 27 and 34 is loaded, or when there is a difference in load, a differential is generated between the pinion gears 43 and 44 and the side gears 45 and 46 (differential). Only the output shaft not receiving a load (or having a small load) rotates in the same direction as the main gear 42.

  Also, even under conditions where differentials can occur, if the differential lock handle 7 is pulled leftward in the figure, the dog 48a of the clutch disc and the dog 47a of the stopper disc 47 are engaged. As a result, the differential gear 40 is differentially locked, and the output shafts 27 and 34 rotate integrally.

  As shown in FIG. 4, the landing gear device 1 having such a differential gear box 4 is mounted on the lower surface of the front portion of the trailer 8.

  Next, the operation of the landing gear device 1 when the trailer 8 is parked on the road surface 9 inclined in the left-right direction of the vehicle body will be described.

  First, as shown in FIG. 5, when the leg portions 22 and 32 of the auxiliary legs 2 and 3 of the landing gear device 1 are stored, the sand shoes 23 and the sand shoes 33 are inclined on the road surface 9 (here, The auxiliary leg 2 side is lower). Further, the auxiliary leg 2 and the auxiliary leg 3 have different ground contact heights (the distance from the vehicle body of the trailer 8 to the road surface 9). Here, by turning the crank handle 6 in a predetermined direction, the legs 22 and 32 of the auxiliary legs are simultaneously lowered. If this is continued, as shown in FIG. 6, the sand shoe 33 of the auxiliary leg 3 positioned on the side with the higher inclination comes into contact with the road surface 9 first. If the crank handle 6 continues to be rotated thereafter, only the leg portion 22 of the auxiliary leg 2 that is not receiving a load from the road surface 9 is lowered by the action of the differential gear 40 in the differential gear box 4 described above.

  Then, when the sand shoe 23 of the auxiliary leg 2 is also grounded as shown in FIG. 7, the operator pulls the differential lock handle 7 and puts the differential gear 40 on the differential lock. If the crank handle 6 is further rotated in the same direction in this state, the leg portions 22 and 32 of the auxiliary legs 2 and 3 are simultaneously extended as shown in FIG. The region between the two auxiliary legs 2 and 3 translates upward. As a result, the trailer 8 can be raised to a desired height and held without tilting left and right in the vehicle width direction.

  Next, an operation for ending the parking of the trailer 8 by the landing gear device 1 will be described.

  First, the trailer 8 is connected to the truck to reduce the load applied to the landing device 1. Next, the crank handle 6 is rotated in the reverse direction with the diff lock applied from the state of FIG. Accordingly, as shown in FIG. 9, the leg portions 22 and 32 of the auxiliary legs 2 and 3 are simultaneously lifted, and the sand shoes 23 and 33 are separated from the road surface 9. Then, as shown in FIG. 10, when the leg portion 32 of one auxiliary leg 3 is fully raised and fully retracted, the diff lock handle 7 is returned to the original position to release the diff lock, and the crank handle 6 is continuously rotated. Thereby, the leg part 22 of the auxiliary leg 2 continues to rise, and finally returns to the state of FIG.

  As is clear from the above description, in the landing gear device 1 of the present embodiment, by simply tilting left and right with a simple structure in which the differential gear 40 is provided between the crank handle 6 and the output shafts 2 and 3. Even on the road surface 9 with different ground contact heights, the trailer can be parked in a stable state by absorbing the difference in ground contact heights.

  In this embodiment, since the differential lock mechanism including the differential lock handle 7, the stopper plate 47, the clutch plate 48, etc. is provided, a reliable operation is possible even when the auxiliary legs 2 and 3 are simultaneously moved up and down. For example, the differential lock can function even under a condition where the differential function of the differential gear 40 can operate due to a difference in the load received by each leg 22, 32 after both legs 22, 32 are grounded. Thus, the differential of the differential gear 40 can be limited (stopped), and the two legs 22 and 32 can be reliably moved up and down simultaneously.

  In the above description, the manual crank handle 6 is used as the input shaft. However, it may be possible to automatically control the motor or the like as power.

  In the above description, the auxiliary legs 2 and 3 are applied to the landing gear device 1. However, the auxiliary legs 2 and 3 can also be used for an outrigger device.

  FIG. 11 shows an outrigger device 110 mounted on an aerial work vehicle 100. The outrigger device 110 is provided with four auxiliary legs 111, 112, 113, and 114. Here, the front auxiliary legs 111 and 112 and the rear auxiliary legs 113 and 114 form a pair, respectively. The front auxiliary leg 111 and the auxiliary leg 112 have substantially the same structure as the landing gear device 1 shown in FIG. That is, the auxiliary leg 111 corresponds to the auxiliary leg 2 in FIG. 1, and the auxiliary leg 112 corresponds to the auxiliary leg 3. Then, by turning the crank handle 115, the auxiliary legs 111 and 112 expand and contract. Similarly, in the auxiliary legs 113 and 114 on the rear side, the auxiliary leg 113 corresponds to the auxiliary leg 2 in FIG. 1 and the auxiliary leg 114 corresponds to the auxiliary leg 3. By turning the crank handle 116, the auxiliary legs 113 and 114 expand and contract.

  Thus, since the difference between the right and left ground contact heights can be absorbed on both the front side and the rear side of the vehicle, the aerial work vehicle 100 can be stabilized with respect to any inclined surface.

  In FIG. 11, the front auxiliary legs 111 and 112 and the rear auxiliary legs 113 and 114 are paired, but the left side auxiliary legs 111 and 113 and the right auxiliary legs 112 and 114 are paired. May be. Thereby, the adjustment corresponding to the front-back inclination can be performed independently on the left and right.

  Needless to say, the outrigger device 100 can also be applied to other vehicles such as a crane truck.

  The present invention can be applied to vehicles such as semi-trailer trailers and crane vehicles.

It is a perspective view which shows the structure of the landing gear apparatus used as embodiment to which this invention is applied. It is a longitudinal cross-sectional view which shows the structure of an auxiliary leg. It is a plane sectional view showing a schematic structure in a differential gearbox. It is a figure which shows the mounting state to the trailer of the landing gear apparatus of this embodiment. It is a figure which shows the state of the landing gear apparatus when the leg part of an auxiliary leg is a storage state. It is a figure which shows the state of a landing gear apparatus when the auxiliary leg of the high slope side contacts the ground. It is a figure which shows the state of a landing gear apparatus when both auxiliary legs are earth | grounded. It is a figure which shows the state of the landing gear apparatus when operating by applying a diff lock after grounding both auxiliary legs. It is a figure which shows the state which accommodates an auxiliary leg in the state which applied the diff lock. It is a figure which shows the state which cancels | releases a differential lock | rock and accommodates an auxiliary leg completely. It is a figure which shows an example of an outrigger apparatus.

Explanation of symbols

1: landing gear device 2: auxiliary leg 3: auxiliary leg 4: differential gear box 5: connecting bar 6: crank handle (input shaft)
7: differential lock handle 8: trailer 9: road surface 21: case 22: leg 23: sand shoe 27: output shaft 31: case 32: leg 33: sand shoe 34: output shaft 40: differential gear 42: main gear 43, 44: Pinion gear 45, 46: Side gear 47: Stopper panel 48: Clutch panel 110: Outrigger devices 111, 112, 113, 114: Auxiliary legs

Claims (4)

A landing gear device for parking a semi-trailer trailer,
An input shaft;
Two auxiliary legs each having a vertically movable leg part and spaced apart from each other;
Two output shafts coupled to each of the legs and rotating as the legs move up and down;
A landing gear device comprising: a differential gear that connects the input shaft and the two output shafts and transmits a rotational force of the input shaft to the two output shafts. The landing gear device according to claim 1,
A landing gear device further comprising a differential lock means for differentially locking the differential gear. An outrigger device mounted on a vehicle,
An input shaft;
Two auxiliary legs each having a vertically movable leg part and spaced apart from each other;
Two output shafts coupled to each of the legs and rotating as the legs move up and down;
An outrigger device comprising: a differential gear that connects the input shaft and the two output shafts and transmits a rotational force of the input shaft to the two output shafts. The outrigger device according to claim 3,
An outrigger device further comprising a differential lock means for differentially locking the differential gear.

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