JPS586916Y2 - Rotary excavator wheel support device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a wheel support device for a rotary excavator in which wheels are provided before and after a pillion that drives the wheel in the rotating direction, and these wheels receive an excavation reaction force.

Conventional rotary excavators that continuously excavate trenches by rotating a wheel with many packets around it have a structure in which the wheel is rotatably supported by multiple wheels, and the excavation reaction force during excavation is absorbed by the wheel. It was received by the driving pinion and part of the wheel.

For this reason, when an excessive excavation reaction force is applied, the pinion bearing is overloaded and rotation is not transmitted smoothly, and the bearing has problems such as seizing and premature wear.

This idea was made with the aim of solving this problem.This rotary excavator is an improved rotary excavator in which the excavation reaction force is not applied directly to the pinion by receiving the excavation reaction force with the wheels installed before and after the rotation direction of the pinion. The present invention provides a wheel support device to prevent the pinion bearing from seizing or abnormally wearing out due to excessive excavation reaction force.

This invention will be described in detail below with reference to an illustrated embodiment.

In the figure, 1 is a body of a rotary excavator that can move freely by means of a leg suspension 3 equipped with a crawler track 2. A body 5 of the rotary excavator is mounted on a support 4 erected at the rear of the body 1 so as to be able to swing vertically. are connected.

The main body 5 has a frame 6 whose one end is pivotally supported by the column 4, and the end of a wire 7 extending from the top of the column 4 is tied to the rear end side of the frame 6. 7 allows the rear end side of the frame 6 to swing in the vertical direction.

Further, a wheel 8 is housed within the frame 6.

The wheel 8 is composed of a pair of ring members 8a spaced apart in the width direction, and the inner peripheral portion of each ring member 8a is rotatably supported by a plurality of wheels 9.

Each wheel 9 is fixed to both ends of a rotating shaft 9a supported by the frame 6 via a bearing 10, two on the lower side of the wheel 8, two on the upper front side, and two on the upper rear side. A total of five gears are arranged on one side to rotatably support the wheel 8, and between the wheels 9 located on the upper front side, there is an internal gear 11 protruding from the side surface of the ring member 8a. A pinion 12 that meshes with the wheels is provided in close proximity to these wheels.

The pinion 12 is fixed to one end of two drive shafts 14 supported by the frame 6 via bearings 13, and the other end of each drive shaft 14 is fixed to sprockets 15 located on both sides of the frame. There is.

The sprocket 15 is housed in a chain cover 16 attached to the frame 6, and is linked to a small sprocket 18 via a chain 17.

The small sprocket 18 is fixed to the end of a differential shaft 20 that projects from the differential 19, and the differential 19 is connected to a power source (not shown) via a power shaft 21.

On the other hand, a large number of packets 22 are horizontally suspended between each link member 8a of the wheel 8 at equal intervals in the circumferential direction.

A cutting blade 23 is attached to the front edge of each packet 22 in the direction of rotation.
The earth and sand excavated by these excavating blades 23 are once stored in the packet 22, and then conveyed above the wheel 8 as the wheel 8 rotates, and transferred to the conveyor 24 inserted into the wheel 8. It is designed to be dropped to.

The conveyor 24 is fixed to the frame 6 so as to be located in a direction perpendicular to the traveling direction, and discharges earth and sand dropped from the packets 22 to the side of the frame 6.

The excavator main body 5 is towed while the vehicle body 1 is self-propelled to excavate a trench, and the wheels 8 are rotated by a power shaft 21. Differential machine 19,
It is rotated via the chain 17 and pinion 12.

As described above, the earth and sand excavated by the packet 22 as the f-wheel 8 rotates is stored in the conveyor 24 and discharged to the side of the main body 5, but the excavation reaction force caused by the packet 22 is shown in FIG. Since the pinion 12 is supported by the three wheels on each side located in front of the wheel 8, these excavation reaction forces are not applied to the pinion 12, and the smooth transmission of power is not hindered. do not have.

Furthermore, even if a large force is locally applied to each digging blade 23 of the packet 22 and the wheel 8 is twisted, and a rotation difference occurs between each ring member 8a, the differential 19 absorbs this rotation difference. There is no risk of damage to the pinion 12 or internal gear 11 due to excessive force being applied thereto.

As described in detail above, this idea is based on the fact that wheels are provided near the front and back of the pinion that drives the wheel in the rotational direction, and the digging reaction force applied to the wheel is received by these wheels. It does not directly engage the pinion.

This eliminates the risk of pinions and bearings being damaged or prematurely worn out due to excessive excavation reaction forces, and since the rotational force is smoothly transmitted from the pinion to the wheel, power transmission loss is also reduced. You can do less.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is a perspective view of the rotary excavator, Fig. 2 is a perspective view of the main body, Fig. 3 is a perspective view of the pinion portion, and Fig. 4 is an explanatory diagram of the operation. be. 1 is the vehicle body, 8 is the wheel, 9 is the wheel, 12 is the pinion,
22 is a packet.

Claims (1)

[Scope of utility model registration request] Behind and around the self-propelled vehicle body 1, there are many packets 22.
A wheel 8 is provided, and a groove is continuously excavated by the packet 22 while the wheel 8 is rotated. A wheel support device for a rotary excavator, in which two of a plurality of wheels 9 are provided, and the excavation reaction force applied to the wheel 8 is received by these wheels 9.