JP2528710Y2 - Outrigger telescopic drive for vehicle-mounted cranes - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention relates to an outrigger telescopic drive device of a vehicle-mounted crane.

(Conventional technology) As an outrigger expansion / contraction drive device for a vehicle-mounted crane, a double-acting hydraulic cylinder is interposed between a conventional inner cylinder and an outer cylinder, and the inner cylinder of the outrigger is extended / contracted by the double-acting hydraulic cylinder. There is known one that is driven. However, such a telescopic drive has a problem that the weight of the double-acting hydraulic cylinder is large and the cost is high. For this reason, the applicant has proposed a method in which the inner cylinder of the outrigger is driven to expand and contract by a motor-driven driving roller that is in rolling contact with the inner cylinder, and this method has been disclosed as Japanese Utility Model Laid-Open No. 63-71189. However, although this method is low in weight and cost, the upper or lower surface of the inner cylinder of the outrigger is used as a rolling contact surface of the driving roller, so that there is a problem that the rolling contact surface is easily stained and the driving roller is easily idled.

The present invention relates to a telescopic drive device of a type in which an outrigger inner cylinder is driven to expand and contract by a motor-driven driving roller that is in rolling contact with the inner cylinder, and solves the above-mentioned problems that this type of telescopic drive device had. It is intended to provide a new telescopic drive device.

(Means for Solving the Problems) In order to achieve the above object, the outrigger telescopic drive device of the vehicle-mounted crane of the present invention is provided with an outrigger outer cylinder having a hollow rectangular cross section that is horizontally mounted on a chassis side frame of the vehicle. In an outrigger of a vehicle-mounted crane in which an outrigger inner cylinder having a hollow rectangular cross section having a jack vertically attached and fixed at its tip is extendably fitted, at least one side edge of an upper plate of the outrigger inner cylinder is attached to the outrigger inside. A drive roller that extends outside the outer side surface of the corresponding side plate of the cylinder to form an extension portion, and is located inside the outrigger outer cylinder side plate below the extension portion and rolls on the lower surface of the extension portion. And the drive roller can be driven forward and reverse by a motor provided outside the outer cylinder of the outrigger.

(Operation) According to the above configuration, the rolling contact surface of the driving roller is located below the extension at the corner defined by the side plate of the outrigger inner cylinder and the extension, so that it is less likely to be soiled, and therefore, becomes dirty. Therefore, the danger of the driving roller idling can be eliminated as much as possible.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. 1 and FIG. In the drawings, A is an outrigger of a vehicle-mounted crane, and an outrigger A of the vehicle-mounted crane is a chassis side frame of a vehicle (not shown).
Outrigger outer cylinder 2 with a hollow rectangular cross-section
An outrigger inner cylinder 4 having a hollow rectangular cross-section to which a jack 3 is vertically attached and fixed at the tip thereof is elastically inserted.

The outrigger outer cylinder 2 includes an upper plate 2a, a lower plate 2b, and lower sides 2c, 2d defining a hollow rectangular cross section. The distal end portion of the outrigger outer cylinder 2 is provided with a support member 2e that covers an upper portion of the distal end opening of the outer cylinder 2 and has an abutment surface below the lower end thereof for abutting against the upper surface of the upper plate 4a of the outrigger inner cylinder 4. Support member 2e is disposed.

The outrigger inner cylinder 4 includes an upper plate 4a, a lower plate 4b, and both side plates 4c and 4d defining a hollow rectangular cross section. On the upper side of the base end of the outrigger inner cylinder 4, the outrigger outer cylinder 2 is provided.
A roller 4e that is in rolling contact with the lower surface of the upper plate is attached.

Side edges on both sides of the upper plate 4a of the outrigger inner cylinder 4 extend outside the outer surfaces of the corresponding side plates 4c, 4d of the outrigger inner cylinder 4 to form extension portions 5,5. Further, the side edges on both sides of the lower plate 4b extend outside the outer side surfaces of the corresponding side plates 4c, 4d of the outrigger inner cylinder 4 to form extension portions 6,6.

7 is attached to the inside of the side plate 2c of the outrigger outer cylinder 2 and located below one of the extending portions 5, 5 of the upper plate 4a of the outrigger inner cylinder 4, and attached to the lower surface of one of the extending portions 5. This is a driving roller that is in rolling contact. Reference numeral 8 denotes an electric motor for rotating the driving roller 7 in the forward and reverse directions, and is attached to the outside of the outrigger outer cylinder 2. Of course, this electric motor
This may be constituted by a hydraulic motor.

9 is mounted on the inner side of the side plate 2d of the outrigger outer cylinder 2 and located below the other of the extending portions 5 and 5 of the upper plate 4a of the outrigger inner cylinder 4 and attached to the lower surface of the other extending portion 5 It is a free rotation type roller that rolls and contacts.

In the above embodiment, the extended portions 5, 5, 6, and 6 are formed on both sides of the upper plate 2a and the lower plate 2b of the outrigger outer cylinder 2, respectively. Although the free-rotation type rollers 9 are respectively rolled and contacted with the extending portions, it is a matter of course that the extending portion, which is an essential requirement of the present invention, may be provided on one of the upper plates 2a. In the case where the extension portion is provided on only one side, the above-mentioned free-rotation type roller 9 is attached to the second
What is necessary is just to arrange so that it may roll contact with the lower surface of the lower plate 4b of the outrigger inner cylinder 4, as shown by the virtual line in the figure.

In any case, the outrigger telescopic drive device of the vehicle-mounted crane of the present invention is mounted on the chassis side frame of the vehicle.
Outrigger outer cylinder 2 with a hollow rectangular cross-section
At least one side edge of the upper plate 4a of the outrigger inner cylinder 4 is provided in an outrigger of a vehicle-mounted crane in which an outrigger inner cylinder 4 having a hollow rectangular cross-section to which a jack 3 is vertically attached and fixed at its tip is extendably fitted. Is extended outside the corresponding side plate outer surface of the outrigger inner cylinder 4 to form an extension portion 5. Inside the outrigger outer cylinder side plate, the extension portion 5 is located below the extension portion 5. The drive roller 7 that rolls and contacts the lower surface is mounted so that the drive roller 7 can be driven forward and reverse by the motor 8 provided outside the outrigger outer cylinder 2. Since it is located below the extension 5 at the corner defined by the side plate 4c and the extension 5 of the inner cylinder 4, it is difficult to be soiled, so that the danger of the driving roller running idle due to the soil is eliminated as much as possible. Is Because

[Brief description of the drawings]

1 and 2 are explanatory views of an outrigger extension / retraction drive device of a vehicle-mounted crane according to the present invention. FIG. 1 is a sectional view of the outrigger of the vehicle-mounted crane, and FIG. 2 is FIG. It is XX sectional drawing of. Chassis side frame; 1,1, Outrigger outer cylinder; 2 (upper plate; 2a, lower plate; 2b, side plate; 2c, 2d) Jack; 3, outrigger inner cylinder; 4 (upper plate; 4a, lower plate; 4b, Side plate; 4c, 4d) Extension part; 5, 5, drive roller; 7, motor; 8

Claims (1)

(57) [Scope of request for utility model registration] An outrigger outer cylinder having a hollow rectangular cross section having a hollow rectangular cross section and a jack is vertically fixed to an end of the outer cylinder having a hollow rectangular cross section horizontally mounted on a chassis side frame of a vehicle. In the outrigger of the crane, at least one side edge portion of the upper plate of the outrigger inner cylinder extends outside the corresponding side plate outer surface of the outrigger inner cylinder to form an extension portion, and the outrigger outer cylinder side plate inner side. A driving roller that is positioned below the extending portion and rolls on the lower surface of the extending portion is attached, and the driving roller can be driven forward and reverse by a motor provided outside the outrigger outer cylinder. Outrigger expansion / contraction drive for vehicle-mounted cranes.