JP4267778B2 - Tractor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tow vehicle configured to perform a towing operation by attaching a wrecking arm to a rear portion of a vehicle and mounting a traveling wheel of a towed vehicle on a wheel mounting frame attached to a front end portion of the wrecking arm.
[0002]
[Prior art]
As this type of towing vehicle, there is a towing vehicle as shown in FIG. This towing vehicle supports a front end portion 3a of a support arm 3 formed in an L shape in a side view on a pivot shaft 2 provided on a vehicle body frame 1a of the vehicle 1 so as to be pivotable in the vertical direction. A base end portion 6a of the wrecking arm 6 is pivotally supported on a pivot shaft 4 provided at the rear end portion 3b of the arm 3 so that the wrecking arm 6 is placed between a suitable position of the support arm 3 and the base end portion 6a of the wrecking arm. Rotation driving means 5 for rotating the storage position D in the substantially vertical state and the work position W in the substantially horizontal state is attached. The wrecking arm 6 is composed of an outer cylinder 6b and an inner cylinder 6c housed in the outer cylinder 6b, and the inner cylinder 6c is expanded and contracted with respect to the outer cylinder 6b by expansion / contraction driving means (not shown). It has become. Further, a wheel mounting frame 8 configured so that the towed vehicle can be mounted by gripping the traveling wheel 7 of the towed vehicle with the wheel holder 8a is attached to the tip of the inner cylinder 6c. Also, an elevating drive device 9 is attached between the appropriate position of the support arm 3 and the appropriate position of the body frame 1a, and the pivoting position of the wreck arm 6 is lowered by driving the elevating drive device 9 according to the working state. The position is adjustable between a position (shown by a solid line) and a raised position (shown by a chain line).
[0003]
The conventional tow vehicle configured as described above is designed to perform towing work as follows. First, the vehicle 1 stops at a position separated from the towed vehicle by a predetermined distance (a distance necessary for preparation for towing). Next, after the wrecking arm 6 in the storage position D is rotated to the substantially horizontal working position W by driving the rotation driving means 5, the lifting / lowering driving device 9 is driven to move the support arm 3 to the lowest position. Lower to near.
[0004]
Next, after extending the inner cylinder 6c of the wrecking arm 6 to bring the wheel mounting frame 8 into contact with the traveling wheel 7 of the towed vehicle, the wheel holder 8a attached to the wheel mounting frame 8 is operated to operate the towed vehicle. The traveling wheel 7 is gripped.
[0005]
Next, after the inner cylinder 6c of the wrecking arm 6 is reduced to an optimum length for towing work, the lifting drive device 9 is driven to rotate the support arm 3 upward, so that the wrecking arm 6 at the time of traveling is moved. Ensure road clearance. Next, the rotation driving means 5 is driven to tilt the wreck arm 6 slightly upward from the horizontal state to prevent damage to the exterior or the like due to contact between the wreck arm 6 and the towed vehicle during towing work.
[0006]
With the above operation, the traveling wheel 7 of the towed vehicle is mounted on the wheel mounting frame 8 and is in a towable state. Therefore, the vehicle 1 can travel to perform the towing operation.
[0007]
[Problems to be solved by the invention]
In this type of tow vehicle, in order to increase the towing capability, generally, a moment arm during towing work, that is, a distance L between the center of the rear wheel 10 and the center of the mounted wheel of the towed vehicle is set short. Therefore, the pivot shaft 4 that pivotally supports the base end portion 6 a of the wrecking arm 6 is attached at a position as close as possible to the rear wheel axle 11.
[0008]
On the other hand, a cross member 12 is generally attached to the body frame 1a of this type of vehicle 1 immediately after the rear axle 11, but the pivoting position of the wrecking arm 6 is set as described above. In order to be able to move up and down, a towing vehicle in which a base end portion 6a of a wrecking arm 6 is pivotally supported on a rear end portion 3b of a support arm 3 pivotally supported so as to be vertically movable with respect to the vehicle body frame 1a. Since the pivoting type of the supporting arm 3 is pivotable, the pivoting trajectory of the support arm 3 is large. To avoid interference with the pivoting trajectory of the supporting arm 3, a position immediately behind the rear wheel axle 11 (normally attached) It was difficult to attach the cross member 12 to the For this reason, there is a problem that the strength of the rear portion of the body frame 1a is insufficient and the body frame 1a is easily bent. In order to solve this problem, the rear portion of the vehicle body frame 1a has been reinforced, but this reinforcement is extremely large, and there is a problem that the cost is increased and the weight is increased.
[0009]
In view of the above-described conventional problems, the present invention changes the lifting / lowering means for adjusting the wrecking arm so that it can be lifted / lowered from a rotary type to a linear drive type, so that when the lifting / lowering means is driven, An object of the present invention is to provide a new towing vehicle that allows a cross member to be arranged immediately after a rear axle of a vehicle body frame without causing interference and eliminates the need for extensive reinforcement at the rear of the vehicle body frame. It is.
[0010]
[Means for Solving the Problems]
The present invention has the following configuration as means for solving the above problems.
That is, the tow vehicle of the present invention is a tow vehicle configured to perform a towing operation by attaching a wrecking arm to the rear portion of the vehicle and mounting a traveling wheel of the towed vehicle on a wheel mounting frame attached to the tip of the wrecking arm. It is targeted.
[0011]
The tow vehicle according to the present invention has a cross member attached immediately after a rear wheel axle of a vehicle body frame in a vehicle, and an outer cylinder having a lower end inclined rearwardly on a vehicle body frame positioned between the cross member and the rear wheel axle. Elevating means comprising an elevating cylinder inserted into the outer cylinder and adjustable by elevating drive means is attached. Further, a base end portion of a wrecking arm having a wheel mounting frame on which a traveling wheel of a towed vehicle can be mounted at the lower end of the hoisting cylinder of the elevating means is pivotally supported, and the hoisting cylinder and the wrecking arm base end portion are supported. A rotation driving means for rotating the wrecking arm between a storage position in a substantially vertical state and a work position in a substantially horizontal state is attached.
[0012]
A towing vehicle according to the present invention is inserted into a body frame positioned between a cross member and a rear wheel axle that are mounted immediately after a rear wheel axle of a vehicle body frame, and an outer cylinder having a lower end inclined backward and the outer cylinder. By attaching a lifting / lowering means comprising a lifting cylinder that can be lifted and lowered by the lifting / lowering driving means, that is, a linear drive type lifting / lowering means, there is no interference with the cross member during the lifting / lowering adjustment of the base end portion of the wrecking arm using the lifting / lowering means. The cross member can be attached to the position just behind the rear axle of the vehicle body frame without happening.
[0013]
Further, a base end portion of a wrecking arm having a wheel mounting frame on which a traveling wheel of a towed vehicle can be mounted at the lower end of the hoisting cylinder of the elevating means is pivotally supported, and the space between the hoisting cylinder and the base end portion of the wrecking arm is supported. Since the rotation driving means for rotating the wrecking arm between the storage position in the substantially vertical state and the work position in the substantially horizontal state is attached to the wrecking arm, if the rotation driving means is driven, It can be rotated between both positions. At this time, the pivoting trajectory of the wrecking arm is the rear position of the cross member, so that interference with the cross member due to the pivoting drive of the wrecking arm can be prevented.
[0014]
As described above, the towing vehicle according to the present invention is configured such that the elevating means is of a linear drive type, so that it is possible to attach the cross member immediately after the rear wheel axle of the vehicle body frame, which increases cost and weight. The large-scale reinforcement of the rear part of the vehicle body frame, which is a factor, becomes unnecessary.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described below with reference to FIGS.
In FIG. 1, reference numeral 20 denotes a cross member attached at a position immediately after the rear wheel axle 11 of the vehicle body frame 1a. The cross member 20 is attached in a ladder shape between the left and right frame members 1b, 1b located behind the rear wheel axle 11, and reduces the torsion of the vehicle body frame 1a that occurs during vehicle travel.
[0016]
Reference numeral 21 denotes lifting means positioned between the cross member 20 of the vehicle body frame 1a and the rear wheel axle 11, and a mounting bracket fixed between the left and right frame members 1b, 1b above the rear wheel axle 11. 22 is attached so that the lower end is inclined rearward. As shown in FIG. 3, the lifting / lowering means 21 is lifted and lowered by an outer cylinder 23 attached to the mounting bracket 22 with its lower end inclined backward, and an extension drive of the lifting / lowering driving means 24 inserted in the outer cylinder 23. It is composed of an adjustable lifting cylinder 25. The elevating drive means 24 fixes the pin 27 provided on the cylinder 24a to the outer cylinder 23 side after passing through the long hole 26 provided on the elevating cylinder 25, and the pin 28 provided on the rod 24b on the upper part of the elevating cylinder 25. The elevator cylinder 25 is fixedly attached, and the elevator cylinder 25 can be driven up and down relative to the outer cylinder 23 by driving the elevator drive means 24 to extend and contract.
[0017]
The elevating means 21 configured as described above is configured so that the elevating cylinder 25 is driven up and down with respect to the outer cylinder 23 when the elevating drive means 24 is extended and retracted, and a base end portion of a wrecking arm described later pivotally supported at the lower end of the elevating cylinder 25 The elevation can be adjusted to any height.
[0018]
Reference numeral 29 denotes a pivot shaft attached at a position deviated toward the rear of the vehicle at the lower end of the elevating cylinder 25, and pivotally supports the base end portion 30a of the wrecking arm 30.
[0019]
The wrecking arm 30 includes an outer cylinder 30b pivotally supported by the pivot shaft 29 on the base end portion 30a, and the vehicle is inserted into the outer cylinder 30b toward the rear of the vehicle by the expansion / contraction driving means 31. It is comprised with the expandable inner cylinder 30c. Further, a conventionally known wheel mounting frame 8 that holds the towed vehicle and holds the traveling wheel 7 is attached to the tip of the inner cylinder 30c. In addition, since the structure of the said wheel mounting frame 8 is a structure similar to the conventional thing, and is not a point of the summary of this invention, it shall omit detailed description.
[0020]
Numeral 33 is a rotation driving means for rotating the wreck arm 30, and is attached in the elevating cylinder 25 of the elevating means 21. The rotation driving means 33 fixes the cylinder 33a to the upper position of the lifting cylinder 25 with the pin 34, and fixes the rod 33b to the boss 36 provided at a proper position on the base end 30a of the wreck arm 30 with the pin 35. Yes. When the rotation drive means 33 is extended and retracted, the wreck arm 30 can be adjusted to rotate between the storage position D in a substantially vertical state and the work position W in a substantially horizontal state. The turning trajectory of the wreck arm 30 by the turning drive means 33 is set to be the rear position of the cross member 20 attached immediately after the rear wheel axle 11 of the vehicle body frame 1a. Even if 30 is rotated, it does not interfere with the cross member 20.
[0021]
The tow vehicle configured as described above is towed as follows. First, the vehicle 1 stops at a position separated from the towed vehicle by a predetermined distance (a distance necessary for preparation for towing). Next, after the wrecking arm 30 in the storage position D is rotated to the substantially horizontal work position W by driving the rotation driving means 33, the elevating drive means 24 is extended to extend the elevating cylinder 25. The wrecking arm 30 is lowered to the vicinity of the lowest lowered position.
[0022]
Next, after extending the inner cylinder 30c of the wrecking arm 30 to bring the wheel mounting frame 8 into contact with the traveling wheel 7 of the towed vehicle, the wheel holder 8a attached to the wheel mounting frame 8 is operated to operate the towed vehicle. The traveling wheel 7 is gripped.
[0023]
Next, after driving the expansion / contraction drive means 31 to reduce the inner cylinder 30c of the wreck arm 30 to an optimum length for towing work, the lift drive means 24 is driven to reduce the pivot support position of the wreck arm 30. It is moved upward to ensure the load clearance of the wreck arm 30 during towing work. Next, if the rotation driving means 33 is driven to tilt the wreck arm 30 slightly upward from the horizontal state to prevent damage to the exterior or the like due to contact between the wreck arm 30 and the towed vehicle during towing work, The vehicle 1 can be driven to perform towing work.
[0024]
As described above, the towing vehicle of the present invention has the outer cylinder 23 whose lower end is inclined rearward on the vehicle body frame 1a positioned between the cross member 20 and the rear wheel axle 11 attached immediately after the rear wheel axle 11 of the vehicle body frame 1a. And an elevating means 21 that is inserted into the outer cylinder 23 and can be adjusted up and down by the elevating drive means 24, that is, the linearly driven elevating means 21 is attached. Even if the base end portion 30a of the arm 30 is adjusted up and down, interference with the cross member 20 does not occur, and the cross member 20 can be attached immediately after the rear axle 11 of the vehicle body frame 1a.
[0025]
Further, the base end portion 30a of the wrecking arm 30 is pivotally supported at the lower end of the lifting cylinder 25 so as to be rotatable between a substantially vertical storage position D and a substantially horizontal work position W. Since the turning trajectory of the arm 30 is set to be the rear position of the cross member 20, the turning drive of the wreck arm 30 does not interfere with the cross member 20.
[0026]
As described above, the towing vehicle according to the present invention is configured so that the elevating means 21 that adjusts the elevation of the base end portion 30a of the wrecking arm 30 is a linear drive type, so that the vehicle body frame 1a is positioned immediately behind the rear wheel axle 11. The cross member 20 can be attached, and the large-scale reinforcement of the rear portion of the vehicle body frame 1a, which causes an increase in cost and weight, can be eliminated.
[0027]
【The invention's effect】
The towing vehicle of the present invention constructed and operated as described above can attach a cross member at a position immediately after the rear axle of the body frame, and can provide a low-cost and low-weight towing vehicle.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram for explaining a main part of a tow vehicle according to the present invention.
FIG. 2 is an explanatory diagram for explaining a working process of the tow vehicle of the present invention.
FIG. 3 is an explanatory view for explaining a lifting means for a tow vehicle according to the present invention.
FIG. 4 is an explanatory diagram for explaining a conventional tow vehicle.
[Explanation of symbols]
1, vehicle, 1a, body frame, 1b, frame member, 7, traveling wheel,
8, wheel mounting frame, 10, rear wheel, 11, rear wheel axle, 20, cross member,
21, lifting means, 22, mounting bracket, 23, outer cylinder, 24, lifting drive means,
24a, cylinder, 24b, rod, 25, lifting cylinder, 26, oblong hole, 27, 28, bin,
29, pivot shaft, 30, wrecking arm, 30a, front end, 30b, outer cylinder,
30c, inner cylinder 31, telescopic drive means 33, rotation drive means 33a cylinder
33b, rod, 34, 35, bin, 36, boss,

Claims (1)

In a towing vehicle configured to attach a traveling arm of a towed vehicle to a wheel mounting frame attached to a rear portion of the vehicle and attach a traveling wheel of a towed vehicle to a wheel mounting frame attached to the tip of the wrecking arm,
A cross member is attached immediately after the rear wheel axle of the vehicle body frame in the vehicle, and is inserted into the outer cylinder and the outer cylinder whose lower end is inclined backward in the vehicle body frame positioned between the cross member and the rear wheel axle. Elevating means consisting of an elevating cylinder that can be adjusted up and down by the elevating drive means is attached, and the base end portion of the wrecking arm having a wheel mounting frame on which the traveling wheel of the towed vehicle can be mounted is rotated at the lower end of the elevating cylinder of the elevating means. A pivoting drive means for pivotally supporting the pivoting unit and pivoting the recking arm between a substantially vertical storage position and a substantially horizontal working position is attached between the lifting cylinder and the base end of the wrecking arm. A towing vehicle characterized by that.

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