JP3309248B2 - Truck tread adjustment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to radish, cabbage,
The present invention relates to a tread adjusting device for a carrier used for harvesting agricultural products such as lettuce and tomato, for example, a stilt-type vegetable carrier.

[0002]

2. Description of the Related Art Crawler-type and wheel-type vegetable transport vehicles are available on stilt floors, and all types of vehicles may be run across ridges where agricultural products are growing. However, ridge width varies depending on the type of crop. Conventionally, as a raised-floor type transport vehicle capable of coping with such a situation, there has been one having a tread adjusting function.

[0003] Japanese Utility Model Publication No. 6-30623 discloses a conventional high-floor vegetable carrier having a tread adjusting function. FIG. 14 is a bottom view of the essential part of the raised floor vegetable carrier viewed from the back. The frame 1 is divided into a wide frame member 2 and a narrow frame member 3 at an intermediate portion in the vehicle width direction A, and each of the frame members 2,
3 are connected to each other so as to be able to approach and separate from each other, and left and right traveling wheels 5A, 5B distributed and attached to the respective frame members 2, 3 are interlocked and connected by a telescopic rotating drive shaft 7 which is rotatable forward and reverse. ing. A screw shaft 10A rotatably supported by the frame member 3 is screwed to a nut body 10B provided on the frame member 2, and the screw shaft 10A is rotatable in forward and reverse directions by an engine (not shown). In the normal rotation, the tread decreases, and in the reverse rotation, the tread increases. In order to connect the frame members 2 and 3 so that they can approach and separate from each other, the frame member 2 is provided with a plurality of hollow cylindrical guides 21 extending in the vehicle width direction in parallel at a plurality of positions in the front-rear direction. Each of the guides 21 has a structure in which a rod 31 fitted to each of the guides 21 so as to be able to be pushed and pulled is protruded from the frame member 3. It is constituted by the fitted shaft 72.

In this high-floor vegetable carrier, when the rotation transmission path of the transmission means is connected to the screw shaft 10A by a clutch (not shown) during traveling and the forward or reverse rotation of the rotary drive shaft 7 is transmitted to the screw shaft 10A, the screw shaft 10A The frame member 2 and the frame member 3 approach or separate from each other by cooperation with the nut body 10B, and accordingly, the intermediate distance between the left and right wheel bodies, that is, the tret is adjusted.

[0005]

However, in the tread adjusting device provided in the conventional raised-floor vegetable carrier, the tread when the tread is maximized (hereinafter referred to as the maximum tread) and the tread are minimized. If the tread adjustment amount, which is the difference between the treads at the time (hereinafter referred to as the minimum tread), is small and the maximum tread corresponds to a wide ridge, the minimum tread is inevitably widened, It could not be loaded on light trucks often used on farmland, which was inconvenient for users. On the other hand, a tread adjusting device capable of coping with a wider ridge has been desired. In the maximum tread state, the insertion length L of the rod 31 inserted into the guide 21 is limited by the length of the guide 21. Therefore, when a heavy object is loaded, the guide 21 and the rod 31 Is bent,
As a result, there has been a problem that the frame 1 is also largely bent.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to increase the amount of tread adjustment in a tread adjusting device of a transport vehicle and to run over a wider ridge. A tread adjusting device for a transport vehicle having a minimum tread enough to be loaded on a light truck and having a large flexure of a frame as in a conventional tread adjusting device even when a heavy load is loaded in a maximum tread state. It is to provide.

[0007]

A tread adjusting device for a transport vehicle according to the present invention is mounted on one of frame members divided into two right and left frame members at an intermediate portion in a vehicle width direction. In the transport vehicle, the traveling wheel and the traveling wheel attached to the frame member on the other side are interlockingly connected to each other so as to be able to approach / separate from each other by a rotational drive shaft which is rotatable forward and reverse and is extendable. On one side of the frame member, a plurality of hollow tubular guides long in the vehicle width direction are provided in parallel at a plurality of locations in the front-rear direction, and each of these guides is individually pushed and pulled so as to penetrate the guides. Rod is projected from the other frame member,
The distal end portion of the rod is configured to be foldable downward at a right angle .

According to a second aspect of the present invention, there is provided a tread adjusting device for a transport vehicle, wherein the rotary drive shaft is fitted to the tubular body, and the intermediate tubular body is removably fitted to the tubular body. This is constituted by a shaft fitted to.

[0009]

[0010]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS This transporting vehicle is a high-floor type vegetable transporting vehicle. As shown in FIGS. 1 and 2, a flat rectangular frame 1, a handle 4 provided on the frame 1, Running wheels 5A, 5
B, etc., and the traveling wheel body 5A of this transport vehicle,
5B employs a rubber crawler. The frame 1 is divided into a wide frame member 2 and a narrow frame member 3 at an intermediate portion in the vehicle width direction A.
The handle 4 and the left running wheel 5A are attached to the frame member 3, and the right running wheel 5B is attached to the frame member 3. Further, a hollow cylindrical guide 21 which is long in the vehicle width direction is provided at the front and rear portions of the frame member 2 in parallel. The rod 31 fitted and protruded from the frame member 3. A joint 32 is provided at a predetermined position on the distal end side of the rod 31 so as to be bent at a right angle. The rod 31 includes a rod member 31A on the distal end side of the joint portion 32 and a rod member 31B on the root side of the joint portion 32.

As shown in FIG. 5 and FIG.
Projection plate 31 provided at the lower end of one end of rod member 31A
C, a protruding portion 31D provided at an upper end of one end of the rod member 31B opposed to the protruding plate 31C and protruding slightly longer than the protruding plate 31C, and the protruding plate 31C and the protruding portion 31
It has a rotary bearing 32A and a pin 32B for joining D. In a state where the rod 31 is not folded,
The upper end surfaces of the rod member 31A and the rod member 31B are brought into contact with each other, and a rotation bearing 32A is rotatably mounted on the lower surface of the protruding portion 31D so as to be rotatable around the vertical direction. A bearing whose axial direction is the horizontal direction is formed, and a projecting plate 31C projecting from the rod 31A is axially mounted on the bearing by a pin 32B. The joint portion 32 configured as described above has a structure that does not bend in an inverted shape due to a load W from above shown in FIG.

In the drive system of FIG. 9, reference numeral 61 denotes an engine, and 62 denotes a speed reducer. An endless V-belt 65 is wound around an output pulley 63 on the engine 61 side and an input pulley 64 on the speed reducer 62 side. And the V belt 6
A switching roller 66 for applying tension to and releasing tension from the belt 5 is attached to the V-belt 65. 1 and 10 is connected to the output shaft of the speed reducer 62, and a sprocket 67A provided at an end of the rotary drive shaft 7 is connected to an endless chain 68.
A is interlockingly connected to a driving sprocket 69A for transmitting rotation to the left traveling wheel body 5A via A. FIG.
A sprocket 67B provided on an output shaft of the speed reducer 62 is interlockingly connected to a drive sprocket 69B for transmitting rotation to the right traveling wheel body 5B via an endless chain 68B as shown in FIG.

As shown in FIGS. 1 and 10, the rotary drive shaft 7 has a cylindrical body 71A, an intermediate cylindrical body 71B fitted to the cylindrical body 71A so as to be able to reciprocate, and a rotationally movable shaft 7B. The rotary drive shaft 7 is extended and retracted by the shaft 72 fitted and retracted with respect to the intermediate cylinder 71B and the intermediate cylinder 71B with respect to the cylinder 71A. It is supposed to. Further, the cylinder 71A, the intermediate cylinder 71B, and the shaft 72 are formed in a hexagonal shape so as not to rotate with each other.
2 is reliably transmitted. The shaft 72 is connected to the sprocket 67A via a universal joint 73.

Next, as can be inferred from FIG. 1, the frame member 3 rotatably supports the screw shaft 10A, while the frame member 2 is provided with a nut body 10B. The body 10B and the screw shaft 10A are screwed together so that the screw shaft 10A is held parallel to the rotary drive shaft 7. The screw shaft 10A has a length that does not come off from the nut body 10B in the maximum tread state. The screw shaft 10A and the nut body 10B have a trapezoidal male screw and a trapezoidal female screw, respectively. The rotation drive shaft 7 and the screw shaft 10A are
Are connected by the transmission means 8 shown in FIG.

The transmission means 8 is an endless belt composed of a driving pulley 81 linked to the rotary drive shaft 7, a driven pulley 82 linked to the screw shaft 10A, and a V belt loosely wound around these pulleys 81, 82. When the tension is not applied to the endless belt 83 (FIG. 11), even if the driving pulley 81 rotates, the rotation is not transmitted to the driven pulley 82, and the tension is applied to the endless belt 83. (See FIGS. 12 and 13), the rotation of the driving pulley 81 is transmitted to the driven pulley 82 via the endless belt 83. The clutch 9 is interposed in the rotation transmission path formed by the transmission means 8.

The clutch 9 includes the endless belt 83 located between the driving pulley 81 and the driven pulley 82.
And a first arm 91 supporting the rod 91a and a rod 92a opposed to the other part B of the endless belt 83 and a first arm 91 supporting the rod 92a. A second arm 92 and push / pull means 93 comprising an inner wire 93a and an outer wire 93b displaced in opposite directions are provided, and the first arm 91 and the second arm 92 are provided with pins 94, 95, respectively.
Is swingably supported on the frame member 3 side by using
The tip of the inner wire 93a is connected to the arm 91, whereas the tip of the outer wire 93b is connected to the second arm 92. Then, the first arm 91 and the second arm 91
When the arm 92 moves to the approaching position shown in FIGS. 12 and 13 by the push / pull means 93, the roller 91a on the first arm 91 and the roller 92a on the second arm 92 are displaced to the operating position shown in FIG. 83 is given tension, and conversely,
When the first arm 91 and the second arm 92 move to the separated position in FIG. 4 by the push / pull means 93, the roller 91a on the first arm 93 side and the roller 92a on the second arm 92 move to the non-operation position in FIG. And the tension of the endless belt 83 is released. 96 is a return spring. The displacement of the push / pull means 93 in the opposite direction between the inner wire 93a and the outer wire 93b is controlled by operating the clutch lever 97 attached to the handle 4 shown in FIG.

In the above, as shown in FIG.
6, the tension of the V-belt 65 is applied to the V-belt 65, the speed of the reduction gear 62,
The power is transmitted to the left traveling wheel body 5A via the chain 68A and the sprocket 69A, and the V belt 65, the speed reducer 6
2. The power is transmitted to the right traveling wheel 5B via the chain 68B and the sprocket 69B.

As described above, the traveling wheel 5 is driven by the drive system.
11A and 11B when the rotation is transmitted to A and 5B.
As described above, when the first arm 91 and the second arm 92 are set to the separated positions by the force of the return spring 96 and the clutch 9 is disconnected (off), the endless belt 83 is loosened and the drive side pulley 81 rotates. Is not transmitted to the driven pulley 82, so that the driving pulley 82 idles together with the rotary drive shaft 7. Therefore, when the clutch 9 is off, tread adjustment is not performed, and the transport vehicle moves forward without tread adjustment when the rotary drive shaft 7 rotates forward, and moves backward without tread adjustment when rotating reversely.

Next, the inner wire 93a and the outer wire 9 of the push / pull means 93 are operated by operating the clutch lever 97.
12 and 13 when the mutual interval between the tips of 3b is narrowed.
As described above, the first arm 91 and the second arm 92 move to the approach position, and accordingly the rollers 91a and 92a are displaced to the operation positions shown in the figure and the tension is applied to the endless belt 83. The rotation can be transmitted to the driven pulley 82. That is, the clutch 9 is connected (on). In this state, the rotation of the rotary drive shaft 7 is transmitted not only to the left and right traveling wheels 5A and 5B but also to the screw shaft 10A via the transmission means 8. for that reason,
When the rotary drive shaft 7 rotates forward in the direction of the arrow in FIG. 13, the screw shaft 10 </ b> A rotates forward and moves in the screwing direction with respect to the nut body 10 </ b> B while the transport vehicle moves forward. Then, the rod 31 is inserted into the guide 21 of the frame member 2, and the tread gradually decreases. In addition, contrary to the rotation direction of the rotation drive shaft 7, FIG.
2, the screw shaft 10A rotates forward and moves in the screwing-out direction with respect to the nut body 10B while the transport vehicle moves backward, whereby the rotary drive shaft 7 is extended and the guide of the frame member 2 is guided. As the rod 31 is pulled out from 21, the tread gradually increases. In the state of the maximum tread shown in FIG. 5, the rod 31 is inserted into the guide 21 with a sufficient insertion length L.

When the truck is loaded on a light truck for transportation, the tread is reduced to the minimum tread and the rod member 31 is moved as shown in FIGS. 3, 7 and 8 on the left side.
A is folded downward and fixed to a fixing bracket 34 provided on the side surface of the frame member 2 using a fixing pin 34A and a snap pin 34B for retaining the fixing pin 34A. When the rod member 31A hits an obstacle such as the tilt of a light truck, as shown on the right side of FIGS. 4 and 8, the rod member 31A is folded inward and fixed to the fixing bracket 35 with the fixing pin 34A and the snap pin 34.
Fix using B to avoid obstacles.

Here, an example has been described in which the tread decreases when the transport vehicle advances, and the tread increases when the vehicle moves backward. However, it is easy to configure such that the tread increases when the vehicle advances and the tread decreases when the vehicle moves backward. it can.

By the way, when the carrier pulls forward and the driving pulley 81 rotates forward, the endless belt 83 as shown in FIG.
Whereas the tension side of the endless belt 83 becomes the portion A and the loose side becomes the portion B, when the drive side pulley 81 reversely rotates, the tension side of the endless belt 83 becomes the portion B and the loose side becomes the portion A as shown in FIG. In any case, the first of the clutch 9
Although the arm 91 and the second arm 92 correspond to the loose side, the movement width is larger than that of the arm corresponding to the tight side. Therefore, the tension side of the endless belt 83 is pulled and the rotation is reliably transmitted to the driven pulley 82 regardless of whether the driving pulley 81 is rotating forward or reverse. In this regard, for example, when the second arm 92 is not provided and only the first arm 91 is provided, the tension side of the endless belt 83 is pressed by the roller 91a when the driving pulley 81 is rotating forward. Since the rotation of the drive-side pulley 81 is used to stretch the endless belt 83, the rotation becomes difficult to be transmitted to the driven-side pulley 82. Therefore, if the first arm 91 and the second arm 92 are provided, there is an advantage that the rotation is reliably transmitted.

[0024]

According to the tread adjusting device for a transport vehicle according to the first aspect of the present invention, the rod is lengthened so that the tip of the rod fitted to each guide so as to be able to be pushed and pulled passes through the guide. Increased tread adjustment. In the state of the minimum tread, it can be loaded on a light truck by folding it downward at a right angle so as not to protrude the tip of the rod protruding on both sides, and in the state of the maximum tread, from the tread adjusting device of the prior art vehicle, Wide treads are possible. Also, in the state of maximum tread,
Since the insertion length inserted into the guide of the rod can be made sufficiently long, the problem that the frame caused in the conventional tread adjusting device, which is caused by the conventional tread adjusting device, is largely bent when a heavy object is loaded is solved. Also, the end of the rod is folded
The direction of the track is downward at a right angle, so the track
If there is an obstacle such as a cage, this can be avoided.

According to the tread adjusting device for a transport vehicle according to the second aspect, the rotary drive shaft is fitted to the cylindrical body, and the intermediate cylindrical body is removably fitted to the cylindrical body; Since it is constituted by the fitted shaft, the amount of extension of the rotary drive shaft is increased, and accordingly, the amount of adjustment of the tread can also be increased.

[0026]

[0027]

[Brief description of the drawings]

FIG. 1 is a bottom view of a main part of a transport vehicle according to an embodiment of the present invention as viewed from the back side.

FIG. 2 is a perspective view showing a state where a left frame and a right frame of the carrier are divided.

FIG. 3 is a perspective view of a transport vehicle.

FIG. 4 is a perspective view of a transport vehicle.

FIG. 5 is an explanatory diagram showing a positional relationship between a guide and a rod in a maximum tread state.

FIG. 6 is an explanatory diagram showing a positional relationship between a guide and a rod when a tread is in an intermediate state.

FIG. 7 is an explanatory diagram showing a positional relationship between a guide and a rod in a minimum tread state.

FIG. 8 is an explanatory diagram showing a direction in which the rod member is folded.

FIG. 9 is an explanatory diagram showing a drive system of a traveling wheel body in a side view.

FIG. 10 is an explanatory diagram showing the drive system in a front view.

FIG. 11 is an explanatory diagram showing a transmission unit and a clutch in an off state.

FIG. 12 is an explanatory diagram showing a transmission unit and a clutch in an ON state.

FIG. 13 is an explanatory diagram showing a transmission unit and a clutch in an ON state.

FIG. 14 is a bottom view of a main part of a conventional transporting vehicle viewed from the back.

[Explanation of symbols]

 2 Frame member 3 Frame member 7 Rotation drive shaft 21 Guide 31 Rod 71A Cylindrical body 71B Intermediate cylindrical body 72 Shaft

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60B 35/00 B62B 3/02 B62D 21/14 B62D 55/10 A01B 73/04

Claims (2)

(57) [Claims] 1. A traveling wheel attached to one of frame members divided into two left and right frame members at an intermediate portion in a vehicle width direction, and a traveling wheel attached to the other frame member. In a transport vehicle in which a wheel body is linked to each other so as to be able to approach / separate from each other by a rotational drive shaft which is rotatable forward and backward and is extendable and retractable, the one side frame member has a hollow cylinder elongated in a vehicle width direction at a plurality of locations in the front-rear direction. Guides are provided in parallel with each other, and rods fitted into the respective guides so as to be individually pushed and pulled so as to penetrate the guides are projected from the frame member on the other side, and the distal end portions of the rods Is configured to be able to be folded downward at a right angle . 2. The method according to claim 1, wherein the rotary drive shaft comprises a cylinder, an intermediate cylinder fitted to the cylinder so as to be able to move back and forth, and a shaft fitted to the intermediate cylinder so as to be able to move back and forth. The tread adjusting device for a transport vehicle according to claim 1, wherein