JP4484331B2 - Tractor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a towing vehicle configured to mount a traveling arm of a towed vehicle on a wheel mounting frame attached to a rear portion of a vehicle frame and to a wheel mounting frame attached to a front end portion of the wrecking arm. is there.
[0002]
[Prior art]
As this type of towing vehicle, there is a towing vehicle as shown in FIG. The towing vehicle has an elevating means 4 comprising an outer cylinder 2 and an elevating cylinder 3 attached to the rear part of a vehicle frame 1 a of the vehicle 1, and the towed vehicle A travels to a tip end 5 a at an elevating cylinder lower end 3 a of the elevating means 4. A base end portion 5b of a wrecking arm 5 provided with a wheel mounting frame 6 on which a wheel a can be mounted is attached so as to be swingable up and down. The elevating means 4 is configured such that the elevating cylinder 3 is driven up and down with respect to the outer cylinder 2 by a built-in elevating driving means 7, and the wrecking arm 5 is driven by a swing driving means 8 incorporated in the elevating cylinder 3. It is driven to swing between a lying posture D in a substantially horizontal state and a standing posture U in a substantially vertical state. Further, the wrecking arm 5 is configured such that the distal end portion 5a is expanded and contracted by the expansion and contraction driving means 9 with respect to the base end portion 5b.
[0003]
The conventional tow vehicle configured as described above is designed to perform towing work as follows. That is, first, the swing driving means 8 is driven to rotate the wrecking arm 5 in the standing posture U until the lying posture D is reached, and then the lifting / lowering driving means 7 is driven to lower the wrecking arm 5 to near the ground. (FIG. 3 shows an alternate long and short dash line). Next, if necessary, the telescopic drive means 9 is driven to extend the wrecking arm 5, and the traveling wheel a of the towed vehicle A is mounted on the wheel mounting frame 6. In this state, the wreck arm 5 is reduced as necessary, and the elevating drive means 7 is driven to raise the wreck arm 5 to a height position at which traction traveling is possible (FIG. 3 two-dot chain line). Therefore, the vehicle 1 can be driven to perform the towing work.
[0004]
In order to normally run the tow vehicle, the wrecking arm 5 is fixed to a standing posture U that is erected in a substantially vertical state as shown in FIG.
[0005]
[Problems to be solved by the invention]
In the conventional tow vehicle, a relatively large reinforcement 10 is attached between the lifting device 4 and the vehicle frame 1a, and a large towing moment acting on the wrecking arm 5 during towing work is dispersed and transmitted to the vehicle frame 1a. ing.
[0006]
However, such a large reinforcement 10 prevents the stress from being concentrated locally by making the vehicle frame 1a flexible (a structure in which the frame is easily bent to prevent local stress due to external force). This is a factor that hinders the flexible structure of the vehicle frame 1a. For this reason, there is a problem that bending is concentrated on the vehicle frame 1a in the vicinity of the reinforcing 10 mounting portion, and cracks and the like are likely to occur in the vehicle frame 1a at that portion.
[0007]
In view of the above-described conventional problems, the present invention is configured so that the traction moment acting on the wreck arm can be dispersed and transmitted to the vehicle frame without using reinforcement that is a factor that hinders the flexible structure of the vehicle frame, It is an object of the present invention to provide a towing vehicle that prevents the occurrence of cracks and the like in a vehicle frame.
[0008]
[Means for Solving the Problems]
The present invention has the following configuration as means for solving the above problems.
That is, the tow vehicle according to the present invention has a wheel capable of mounting an elevating means comprising an outer cylinder and an elevating cylinder at the rear part of the vehicle frame and mounting a traveling wheel of the towed vehicle at the tip at the lower end of the elevating cylinder of the elevating means. The base end of the wrecking arm equipped with the mounting frame is mounted so that it can swing up and down, and the towing work is carried by mounting the traveling wheels of the towed vehicle on the wheel mounting frame at the tip of the wrecking arm that is lying down in a substantially horizontal state. It is intended for towing vehicles configured to perform
[0009]
In the towing vehicle of the present invention, the lifting means is attached to the rear portion of the vehicle frame by pivotally supporting the rear side of the lower end of the outer cylinder at a position closer to the rear of the subframe, and the upper position of the outer cylinder and the subframe. The positions closer to the front are connected by links of a predetermined length, and the front and rear positions of the subframe are fastened and fastened to the vehicle frame by fastening means.
[0010]
In the towing vehicle of the present invention configured as described above, the rear side of the lower end of the outer cylinder of the elevating means is pivotally supported at a position closer to the rear of the subframe, and the upper position of the outer cylinder is positioned closer to the front of the subframe via the link. Accordingly, the traction moment acting on the wreck arm during the traction operation is transmitted to the two separated positions of the sub-frame, that is, the rearward position and the forward position, via the lifting means. The traction moment transmitted to the subframe is effectively transmitted to the vehicle frame by fastening means provided at the front position and the rear position of the subframe. For this reason, a compression force acts mainly on the subframe, and a large bending force does not act on the subframe, so that the subframe can be configured to be relatively light. Further, the sub frame is fastened to the vehicle frame only at the front position and the rear position thereof, so that the flexible structure of the vehicle frame is not hindered so that stress can be prevented from being concentrated locally on the vehicle frame. is there. Further, by using the subframe, it is possible to attach the hydraulic equipment, the control equipment, etc. on the subframe to the vehicle and to improve the assemblability.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, 11 is a sub-frame mounted on the vehicle frame 1a. The subframe 11 includes a pair of left and right main members 11m and 11m and front and rear connecting members 11s and 11s that connect the main members 11m and 11m. Fastening portions 12, 12,... Are provided at the front, rear, left, and right positions of the subframe 11, and the vehicle is located at the rear of the vehicle frame 1a, that is, above the rear wheel 1b, by fastening means such as bolts 13, 13,. It is fastened and fixed to the frame 1a. Since the sub-frame 11 is fastened and fixed to the vehicle frame 1a in this way, it does not significantly disturb the flexible structure of the vehicle frame 1a and can prevent stress from being concentrated locally on the vehicle frame 1a. is there.
[0012]
Reference numeral 4 denotes an elevating means, which includes an outer cylinder 2, an elevating cylinder 3 slidably inserted in the outer cylinder 2, and an elevating drive means 7 that drives the elevating cylinder 3 up and down relative to the outer cylinder 2. ing. As shown in FIG. 1, the outer cylinder 2 of the lifting / lowering means 4 is fixed with a pin 16 to a boss hole 15 provided at a position 11 a closer to the rear side of the subframe 11 with a pivot hole of a bracket 14 provided on the rear side of the lower end 2 a. Installed. The length between the pivot hole of the bracket 17 provided at the upper position 2b of the outer cylinder 2 and the boss hole 18 provided at the front position 11b of the subframe 11 is such that the outer cylinder 2 is inclined rearward. They are connected by a link 19 having a predetermined length.
[0013]
The elevating drive means 7 is composed of a hydraulic cylinder. The cylinder end 7a is fixed to the lower portion of the outer cylinder 2 with a pin 20, and the rod end portion 7b is fixed to the upper portion of the elevating cylinder 3 with a pin 21. It is installed. For this reason, if the elevating drive means 7 is driven to extend, the elevating cylinder 3 rises with respect to the outer cylinder 2, and descends if driven to reduce.
[0014]
A pivot shaft 22 is attached to the lower end 3a of the lifting cylinder 3 so as to be offset toward the rear of the vehicle, and the proximal end portion 5b of the wrecking arm 5 is in an upright posture on the pivot shaft 22. It is pivotally supported so that it can swing between U and a generally horizontal lying posture D.
[0015]
Reference numeral 8 denotes swing driving means for swinging the wreck arm 5, which is attached to the elevating cylinder 3. The swing driving means 8 is constituted by a hydraulic cylinder, and the cylinder end portion 8a is fixed to the upper part of the elevating cylinder 3 with a pin 23, and the rod end portion 8b is pinned to the base end portion 5b of the wrecking arm 5 at an appropriate position. Fixed at 24. For this reason, the wrecking arm 5 is in the standing posture U when the swinging drive means 8 is driven to extend, and is in the lying posture D when driven in a reduced manner.
[0016]
The wrecking arm 5 includes an outer cylinder 25 whose base end portion 5b is pivotally supported on the pivot shaft 22, an inner cylinder 26 slidably inserted in the outer cylinder 25, and an inner cylinder 26 and an outer cylinder 25. The telescopic driving means 9 is configured to extend and contract the cylinder 26. Further, a conventionally known wheel mounting frame 6 on which a traveling wheel a of the towed vehicle A can be mounted is attached to the distal end portion of the inner cylinder 26.
[0017]
The tow vehicle configured as described above is towed as follows. First, the vehicle 1 is stopped at a position separated from the towed vehicle A by a distance necessary for preparation for towing. Next, the swinging drive means 8 is driven to contract to swing the wrecking arm 5 in the standing posture U until it reaches a substantially horizontal lying posture D, and the lifting / lowering driving means 7 is driven to reduce the wrecking arm 5. Lower to near the ground (shown in FIG.
[0018]
Next, if necessary, the telescopic drive means 9 is extended to extend the wreck arm 5 and the traveling wheel a of the towed vehicle A is mounted on the wheel mounting frame 6.
[0019]
Next, if necessary, the expansion / contraction driving means 9 is reduced and the wreck arm 5 is reduced, and the elevating / lowering driving means 7 is extended and the recking arm 5 is raised to a height position where the pulling work can be performed. Next, if necessary, the swing drive means 8 is extended and tilted so that the wrecking arm 5 is tilted slightly upward (to prevent contact between the wrecking arm 5 and the towed vehicle A during towing work). The preparation is completed and the vehicle 1 can be run to perform the towing work.
[0020]
In the towing vehicle configured in this manner, the rear side of the lower end 2a of the outer cylinder of the lifting / lowering means 4 is pivotally supported at the rearward position 11a of the subframe 11, and the upper position 2b of the outer cylinder 2 is connected to the subframe 11 via the link 19. Because of this, the traction moment acting on the wreck arm 5 during the traction operation is moved to two separated positions of the subframe 11 via the elevating means 4, that is, the rearward position 11a and the forward position 11b, respectively. It is transmitted. Then, the traction moment transmitted to the subframe 11 is effectively transmitted to the vehicle frame 1a by the fastening portions 12, 12,... Provided at the front position and the rear position. For this reason, since the compression force mainly acts on the subframe 11 and a large bending force does not act, the subframe 11 can be configured to be relatively light. Further, since the sub frame 11 is fastened to the vehicle frame 1a at the front position and the rear position thereof, the stress is locally concentrated on the vehicle frame 11 without hindering the flexible structure of the vehicle frame 1a. It can be prevented. Further, by using the subframe 11, it is possible to attach it to the vehicle frame 1a in a state in which a hydraulic device, a control device or the like is assembled on the subframe 11, and to improve the assemblability.
[0021]
【The invention's effect】
The towing vehicle of the present invention constructed and operated as described above can effectively transmit the towing moment acting on the wrecking arm during towing work to the vehicle frame, and prevent stress from being concentrated locally on the vehicle frame. It can be done.
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[Brief description of the drawings]
FIG. 1 is a side view illustrating a main part of a tow vehicle according to the present invention.
FIG. 2 is a plan view of the same.
FIG. 3 is an explanatory diagram of a conventional tow vehicle.
[Explanation of symbols]
1, vehicle, 1a, vehicle frame, 1a, rear wheel, 2, outer cylinder, 2a, lower end, 2b, upper position,
3, lifting cylinder, 3a, lower end, 4, lifting means, 5, wrecking arm,
6, wheel mounting frame, 7, lift drive means, 8, swing drive means, 9, telescopic drive means,
10, reinforcement, 11, subframe, 11a, forward position, 11b, rear position,
11m, main member, 11s, connecting member, 12, fastening part, 13, fastening means, 14, bracket,
15, boss hole, 16, pivot pin, 17, bracket, 18, boss hole, 19, link,
22, pivot shaft, 25, outer cylinder, 26, inner cylinder, A, towed vehicle, a, traveling wheel,
D, lying posture, U, standing posture,

Claims (1)

A base of a wrecking arm having a wheel mounting frame on which a traveling wheel of a towed vehicle can be mounted at a tip at the lower end of the lifting cylinder at the lower end of the lifting cylinder is attached to the rear part of the vehicle frame. In a towing vehicle configured to mount a traveling wheel of a towed vehicle on the wheel mounting frame of the tip of the wrecking arm that is attached to an end portion so as to be swingable up and down and is inclined in a substantially horizontal state,
The lifting means is attached to the rear part of the vehicle frame by pivotally supporting the rear side of the lower end of the outer cylinder at a position closer to the rear of the subframe, and a predetermined length between the upper position of the outer cylinder and the position closer to the front of the subframe. A towing vehicle, which is connected by a link, and is attached by fastening the front and rear positions of the subframe on the vehicle frame by fastening means.

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