JPH0640483Y2 - Index plate mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a towing plate mounting structure which is mounted on a vehicle with a high vehicle height such as an all-terrain crane vehicle.

(Prior art and its problems) Rough terrain mobile cranes and all-terrain mobile cranes are known as mobile cranes that emphasize maneuverability in the field. It has a wheel drive function (4WD), all-wheel steering function (4WS), and uses large diameter single tires, so the chassis frame has a high ground clearance.

By the way, when the tow plate is attached to such a vehicle, the tow plate is fixed to the front and rear end faces of the chassis frame because the attaching portion needs to have strength to withstand tow.
However, in the rough terrain crane vehicle and the all terrain crane vehicle, since the ground height of the chassis frame is high, the ground height of the mounting position of the tow plate is also high. On the other hand, the mounting positions of the towing plates of ordinary vehicles that pull these crane vehicles are lower than those of these crane vehicles, and the heights of the mounting positions of the towing plates of the crane vehicles to be towed and the towing vehicles are large. Often different. For this reason, the towing direction when towing a rough terrain crane vehicle or an all-terrain crane vehicle is diagonally downward, apart from the ideal horizontal direction, so the vertical component of the traction force increases,
There is a problem that load is applied to the axle and the traction efficiency is reduced.

Also, in order to bring the mounting position of the towing plate of the mobile crane closer to the height of the mounting position of the towing plate of the vehicle,
For example, the traction plate may be fixed to the side wall of the outrigger box that is laterally fixed to the lower surface of the end of the chassis frame, but the side wall of the outrigger box is not a strong member.
It is thin and lacks strength, and the side wall of the outrigger box is deformed during towing, which is inconvenient.

The present invention has been made in order to solve the above-mentioned problems, and there is no problem in strength, and the traction plate is designed to be mounted at the height of the axle center position which is the ideal mounting height. It is intended to provide a mounting structure for.

(Means for Solving the Problem) According to the present invention in order to achieve the above object, according to the present invention, a lower surface is provided with a chassis frame located higher than a center of an axle, and an outrigger box is laterally provided on a lower surface of an end portion of the chassis frame. In a structure for mounting a tow plate of a vehicle fixedly mounted, a back side edge of the tow plate is fixed to a side wall of the outrigger box over substantially the entire height of the outrigger box, and an upper edge of the chassis frame is provided. It is configured to be fixed to the lower surface strength member.

(Function) The back side edge of the tow plate is on the side wall of the outrigger box,
The outrigger box is fixed over substantially the entire height, and
Since the upper edge is fixed to the lower surface strength member of the chassis frame, most of the pulling force at the time of towing acts on the lower surface strength member of the chassis frame, and the attachment part of the towing plate has no problem in strength, and The ground height of the outrigger box is substantially equal to the height of the center of the axle, and the traction direction passes through the center of the axle, and the traction component force that pushes the axle toward the ground is small.

Embodiment An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows the appearance of an all-terrain crane vehicle according to the present invention. In an all-terrain crane vehicle 1, a crane 4 is mounted via a turntable 3 on a chassis frame 2 extending over substantially the entire length of the vehicle. A carrier house 5 is provided at the front end of the above, and a crane house 6 that rotates together with the crane 4 is provided at the turntable 3, and the crane vehicle 1 can be operated in each of the houses 5, 6. At the front and rear ends of the chassis frame 2, a front outrigger box 7 and a rear outrigger box 8 are horizontally mounted between the left and right side members, and the front and rear outrigger boxes 7 and 8 are adjacent to the outrigger boxes 7 and 8. And large single tires 9 and 10 are attached. A front axle 11 to which the front wheels 9 are attached and a rear axle 12 to which the rear wheels 10 are attached are suspended from the chassis frame 2 via tapered leaf springs (not shown).

Each of the left and right side members of the chassis frame 2 has a hollow cross-section box shape composed of an upper plate 2a, an outer plate 2b, an inner plate (not shown), and a lower plate 2c. The lower plate 2c is a strength member, and is formed thick and strong.

The front outrigger box 7 is fixed to the chassis frame 2 between the upper wall plate of the front outrigger box 7 and the lower plate 2c of the chassis frame 2 through a spacer 13 having a trapezoidal shape having a wide upper section in a side view. Has been done. The spacer 13 is a strength member, is formed thickly and with strength, and has a role of distributing a load acting on the chassis frame 2 from an outrigger described later through the outrigger box 7. The rear outrigger box 8 is housed in the front outrigger box and the rear outrigger box 8 when suspending the crane 4, which is fixedly installed so as to bridge the lower ends of the lower plates 2c of the left and right side members. An outrigger (not shown) is juxtaposed in the left-right lateral direction to fix the chassis frame 2, and a suspending operation is performed.

Outrigger boxes 7, 8 at the front and rear ends of chassis frame 2
Traction plates 20 and 21 are arranged at the mounting portions, respectively.
2 and 3 show the details of the rear traction plate 21. The traction plate 21 is, for example, a thick steel plate formed into a substantially right triangle and has a traction hole 21a formed at a predetermined position. ing. The center of the pulling hole 21a is preferably located within, for example, 1/4 of the total height from the upper end of the pulling hole 21a. An end plate 2d of a cross member that connects the left and right side members is fixed to the rear end of the chassis frame 2, and the lower plate 2c of the side member of the chassis frame 2 is slightly rearward of the end plate 2d. Has been extended to. The upper edge 21b of the traction plate 21 is welded to the lower surface of the lower plate 2c over substantially the entire length, and the back side edge 21c is welded to the side wall 8a of the outrigger box 8 over substantially the entire height, for example, by continuous connection. ing.

The operation will be described below.

The rear side edge 21c of the towing plate 21 is welded over substantially the entire height of the side wall 8a of the outrigger box 8, and the upper edge 21b of the towing plate 21 is an extension portion of the lower plate 2c as the strength member 6. Is welded to the lower surface of the
Is pierced in the range of 1/4 of the total height from the upper edge 21b of the towing plate 21, so most of the towing force during towing work, for example,
Two-thirds or more can be transmitted to the lower plate 2c, so that it is possible to avoid the inconvenience such as the deformation of the side wall 8a that occurs when the tow plate 21 is attached only to the side wall 8a of the outrigger box 8. Moreover, the position of attachment of the tow plate 21 is approximately the same height as the axles 11 and 12, and the direction of towing will pass through the center of the axles 11 and 12, reducing the vertical component force of the force required for towing. The friction resistance of the tire and the load on the axle are reduced.

In the above description, the case where the traction plate 21 is fixedly installed across the lower plate 2c, which is a strength member of the chassis frame 2, and the outrigger box 8 is taken as an example, but the front outrigger box 7 shown in FIG. When it is attached to the chassis frame 2 via the spacer 13 which is a strength member like the above, the upper edge of the traction plate is welded to this spacer 13 and the back side edge is welded to the side wall of the outrigger box 7. However, in this case as well, the same operational effects as those of the above-described embodiment are exhibited.

As described above, according to the attachment structure of the tow plate of the present invention as described above, the back side edge of the tow plate is fixed to the side wall of the outrigger box over substantially the entire height of the outrigger box, and Since the upper edge is fixed to the lower surface strength member of the chassis frame, there is no fear of deformation of the attachment part of the tow plate, and the ground clearance for attaching the tow plate can be made lower. As a result, it is possible to approach the height of the axle center position, which is the preferable mounting height of the towing plate, and the difference in the ground height of the mounting position from the towing plate of the normal vehicle that pulls the crane vehicle decreases, so the towing work The pulling direction becomes closer to the horizontal direction, and the vertical component of the pulling force decreases. Therefore, there is an excellent effect that the load on the axle or the like can be reduced and the traction efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing an appearance of an all-terrain crane vehicle to which the present invention is applied, FIG. 2 is a side view showing an embodiment of a tow plate mounting portion to which the present invention is applied, and FIG. Two
It is a perspective view of a figure. 1 ... All-terrain mobile crane, 2 ... Chassis frame, 2c ... Lower plate, 7, 8 ... Outrigger box, 9, 10 ... Large single tire, 11, 12 ... Axle, 13 ... Spacer, 20 , 21 …… Towing plate, 21a…
… Tow hole.

Claims (1)

[Scope of utility model registration request] 1. A traction plate mounting structure for a vehicle, comprising a chassis frame whose lower surface is located higher than a center of an axle, and an outrigger box laterally fixed to a lower surface of an end portion of the chassis frame. Of the rear side of the outrigger box is fixed to the side wall of the outrigger box over substantially the entire height of the outrigger box, and the upper edge is fixed to the lower surface strength member of the chassis frame. .