JPH0565673U - Drive device for aerial work vehicles - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a drive device for an aerial work vehicle in which the center of gravity can be lowered by attaching a hydraulic pressure generator to the lower surface of a chassis frame at the rear of the rear wheels of the vehicle. It is a thing. [Structure] For this purpose, a turntable is mounted on a chassis frame, and in an aerial work vehicle in which a boom equipped with a bucket at its tip is erected up and down, the drive means is driven by the drive means. A hydraulic pressure generating device including the hydraulic pump described above is attached to the lower surface of the chassis frame behind the rear wheels of the vehicle.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drive system for an aerial work vehicle in which the center of gravity can be lowered by attaching a hydraulic pressure generator to the lower surface of the chassis frame behind the rear wheels of the vehicle.

[0002]

[Prior art]

 In the conventional aerial work vehicle 10, for example, the hydraulic pressure generator 11 in which the engine 11a which is the driving means and the hydraulic pump 11b are covered by the soundproof cover 11c has a hollow structure mounted on the upper portion of the chassis frame 10a as shown in FIG. It was mounted on the subframe 12 of.

[0003]

[Problems to be solved by the device]

 The hydraulic pressure discharged from the hydraulic pressure generator 11, which is the drive unit of the conventional aerial work vehicle 10, pivotally attaches the base end to the turntable 13 and the turntable 13 which are mounted on the subframe 12 so as to be rotatable. Since it was sent to each actuator that operates the aerial work equipment composed of the retractable boom 14 and the bucket 15 attached to the end of the boom 14 through the control device equipped in the bucket 15, The hydraulic pressure discharged from the generator 11 is sent to the control device via the oil supply pipe once piped in the boom 14, and then sent to each actuator. Therefore, the hydraulic pressure generator 11 considers the pressure loss in the oil supply pipe. Therefore, the engine 11a and the hydraulic pump 11b inevitably have to use high-power ones. c also increases, resulting in the hydraulic pressure generating device 11 is made large as shown in FIG. 2, it was to increase the occupation over the sub-frame 12. Therefore, the weight is heavy, and the heavy object is mounted above the sub-frame 12, so that the traveling stability is deteriorated, and a large area of the sub-frame 12 is occupied by the hydraulic pressure generator 11. There have been various problems such as the installation space of the tool box and the like required for the work vehicle 10 being significantly restricted.

[0004]

[Means for Solving the Problems]

 The present invention has been made in view of the above problems, and an object of the present invention is to lower the center of gravity position by attaching a hydraulic pressure generator to the lower surface of the chassis frame at the rear of the rear wheels of the vehicle. The present invention is to provide a drive device for an aerial work vehicle capable of performing such a work.For that purpose, a turntable is mounted on a chassis frame, and a boom equipped with a bucket at its tip is attached to the turntable so that the work can be performed up and down. In a vehicle, a hydraulic pressure generating device including a drive unit and a hydraulic pump driven by the drive unit is attached to the lower surface of the chassis frame at the rear of the rear wheel of the vehicle.

[0005]

[Action]

 Since the above structure is adopted, the space above the chassis frame is wide, and therefore a tool box with a large volume can be installed above the chassis frame, and the hydraulic pressure generator is located below the chassis frame. The center of gravity of the vehicle is lowered, and therefore the running stability is improved.

[0006]

【Example】

 Hereinafter, an embodiment of a drive device for an aerial work vehicle according to the present invention will be described in detail with reference to FIG. In the figure, reference numeral 1 is an aerial work vehicle equipped with a drive unit according to the present invention. A subframe 3 having a hollow structure is mounted on a chassis frame 1a of the aerial work vehicle 1. Outriggers 1b capable of overhanging and grounding are provided on both front and rear sides of the subframe 3, respectively. A turntable 4 is rotatably mounted on the subframe 3, and the turntable 4 is swung by a hydraulic motor (not shown). A turntable 4 has a boom 5 which is extensible and retractable, and a base end of the boom 5 is pivotally attached. It expands and contracts by expanding and contracting a cylinder (not shown). A bucket 6 is attached to the tip of the boom 5. The bucket 6 is equipped with an operating device, and the turntable 4 is equipped with a switching valve (not shown in the figure) that operates by a signal from the operating device and controls each actuator such as a hydraulic motor, a hoisting cylinder and an expansion cylinder. Has been done.

On the lower surface of the chassis frame 1a or the lower surface of the subframe 3 between the rear wheel 7 of the vehicle and the rear outrigger 1b, an engine 2a which is a driving means and a hydraulic pump 2b which is driven by the engine 2a and discharges hydraulic pressure are configured. The hydraulic pressure generator 2 is installed. The discharge port of the hydraulic pump 2b of the hydraulic pressure generator 2 is connected to a switching valve equipped on the turntable 4 via an oil feed pipe arranged in the hollow portion of the subframe 3, and the pressure oil discharged from the hydraulic pump 2b is switched. Since it is not necessary to once carry the pressure oil to the bucket 6 by the oil supply pipe that is supplied to each actuator via the valve and is piped in the boom 5, unlike the conventional case, the engine 2a and the hydraulic pump 2b can be downsized. Therefore, the hydraulic pressure generator 2 could be attached to the lower surface of the chassis frame 1a or the subframe 3.

Further, an electric motor may be used as the drive means of the hydraulic pressure generator 2 instead of the engine 2a, and the drive means is not particularly limited to the above embodiment. Hereinafter, the operation of the drive system for an aerial work vehicle according to the present invention will be described based on the above-described embodiment. That is, the aerial work vehicle 1 equipped with the drive device according to the present invention controls the switching valve mounted on the turntable 4 by a signal from the operating device mounted on the bucket 6 to control the hydraulic motor, the undulating cylinder and the telescopic cylinder. The pressure oil discharged from the hydraulic pump 2b for driving each actuator such as the oil is sent to a switching valve equipped on the turntable 4 through an oil feeding pipe arranged in the hollow portion of the subframe 3 to perform the switching. It is not necessary to once carry pressure oil to the bucket 6 from the oil supply pipes installed inside the boom 5 since it is supplied to each actuator via the valve, so that the engine 2a and the hydraulic pump 2b can be downsized. Therefore, the hydraulic pressure generator 2 could be attached to the chassis frame 1a between the rear wheel 7 and the rear outrigger 1b or the lower surface of the sub-frame 3.

Therefore, the upper space of the subframe 3 is widened, so that a tool box or the like having a large volume can be mounted above the subframe 3, and the turning operation of the turntable 4 and the hoisting operation of the boom 5 can be performed. Alternatively, the degree of freedom in designing the storage position of the bucket 6 and the like becomes wider. Moreover, since the mounting position of the hydraulic pressure generator 2 is the lower surface of the chassis frame 1a or the subframe 3 between the rear wheel 7 and the rear outrigger 1b, the center of gravity of the aerial work vehicle 1 becomes low, and therefore the traveling stability is improved. ..

[0010]

[Effect of the device]

 As described in detail above, the present invention provides a drive means for an aerial work vehicle in which a turntable is mounted on a chassis frame, and a boom having a bucket at its tip is erected up and down. Since the hydraulic pressure generator constituted by the hydraulic pump driven by the drive means is attached to the lower surface of the chassis frame at the rear of the rear wheel of the vehicle, the space above the chassis frame is wide, and therefore the large volume above the chassis frame is provided. Since it is possible to equip a tool box or the like having the above, and since the hydraulic pressure generator is located below the chassis frame, the center of gravity of the work vehicle is lowered, and therefore, the running stability is improved and various other advantageous effects are obtained.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a drive system for an aerial work vehicle according to the present invention.

FIG. 2 is a side view showing an example of a drive device for a conventional aerial work vehicle.

[Explanation of symbols]

 1 Aerial work vehicle 1a Chassis frame 1b Outrigger 2 Oil pressure generator 2a Engine 2b Hydraulic pump 3 Subframe 4 Turntable 5 Boom 6 Bucket 7 Rear wheel

Claims (1)

[Scope of utility model registration request] 1. An aerial work vehicle in which a turntable is mounted on a chassis frame, and a boom equipped with a bucket at its tip is attached to the turntable so that the boom can be raised and lowered.
A drive system for an aerial work vehicle, characterized in that a hydraulic pressure generator comprising a drive means and a hydraulic pump driven by the drive means is attached to the lower surface of the chassis frame at the rear of the rear wheels of the vehicle.