JPH0533593Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to a casing of an earth auger, a cylindrical outer shaft of a construction machine such as a torque tube, and an inner shaft disposed concentrically inside the cylindrical outer shaft. This invention relates to a drive device that separately and independently drives two axes.

(Prior art) In conventional general-purpose earth augers, a cylindrical casing and a torque tube are vertically installed concentrically on an auger machine, and both shafts are rotated in conjunction with one drive device installed on the auger machine. For example, the ground is excavated using an auger screw provided on the casing and a cutter head provided on the torque tube.

However, since properties such as hardness and viscosity of the ground change depending on various strata such as gravel, sand, viscosity, and mud, it is desirable to change the rotation speed of the casing and torque tube according to these properties. In the conventional general-purpose auger machine mentioned above, both shafts rotate in conjunction with each other, so even if the rotation speed of one is made to correspond to the above properties, the rotation speed of the other will automatically change at a predetermined ratio to obtain the desired rotation speed. First, there was the problem of reduced excavation efficiency.

Therefore, the present applicant has previously proposed a configuration in which an auger machine is provided with two drive devices so that the casing and the torque tube can be rotated separately and independently (Utility Application No. 6399/1989).

(Problem that the invention aims to solve) However, in the proposed earth auger above, the rotational speeds of the two shafts, the casing and the torque tube, can be adjusted separately in accordance with the properties of the ground, thereby achieving high excavation efficiency, but there is a drawback in that the auger machine, which is equipped with two drive units, becomes large and heavy, and there is still room for improvement.

That is, the two drive devices that rotate the casing and the torque tube are each equipped with a drive motor and a gear reducer that drives the drive motor on the same axis, and these two gear reducers have a reduction ratio. Because of this, their outer diameters are very large, and because of this they cannot be placed side by side on the same horizontal level, so they are placed vertically offset from each other.

In order to install two gear reducers that are shifted vertically in this way, the respective drive motors must also be provided that are shifted vertically, or the drive shaft of one of the drive motors must be extended downward. must be established.

As a result, the total length of the earth auger increases by the distance that the two gear reducers are shifted vertically.

As the total length of the earth auger increases in this way,
In particular, since the heavy driving device is positioned upward by the above-mentioned shifted distance, the center of gravity of the earth auger moves upward, making it extremely unstable, which may be the cause of the earth auger falling over frequently in recent years. It's summery. In order to avoid this, if the overall length of the casing or torque tube is shortened to shorten the installation upper limit of each drive device, the excavation distance will also become shorter and excavation efficiency will deteriorate.

The present invention was developed in view of the above-mentioned circumstances, and the casing of the earth auger, the cylindrical outer shaft of a construction machine such as a torque tube, and the inner shaft disposed concentrically inside the casing of the earth auger are separate and independent. It is an object of the present invention to provide a drive device that can be driven in a simple manner and has a short vertical length of a drive section.

(Means for Solving the Problems) In order to achieve the above object, the two-shaft drive device for construction machinery of the present invention has a ring-shaped external gear fixed to the end of a cylindrical outer shaft, and the outer shaft A ring-shaped internal gear is fixed to the end of an inner shaft that is arranged concentrically inside the device, and a fixing ring is concentrically fixed to the mounting base between the external gear and the internal gear. The external gear is rotatably supported on the outside and the internal gear is rotatably supported on the inside through bearings, and the mounting base has a cylindrical outer shaft that meshes with the external gear and drives the cylindrical outer shaft to rotate. A configuration is adopted in which a pinion and its drive motor are attached, and a pinion and its drive motor that mesh with the internal gear and rotationally drive the inner shaft are attached.

(Function) The drive section of the device of this invention has a triple ring structure in which a ring-shaped internal gear and an external gear are rotatably fitted through bearings on the inside and outside of a fixed ring fixed to a mounting base, and both gears are engaged with pinions that are rotated by separate drive motors. Since the external gear is fixed to the end of a cylindrical outer shaft and the internal gear is fixed to the end of an inner shaft arranged concentrically inside the outer shaft, both shafts are rotated by the rotation of each pinion, and the rotation speeds of both shafts can be adjusted individually by controlling each drive motor. Therefore, for example, when this invention is applied to an earth auger, it is possible to increase excavation efficiency by changing the casing and torque tube according to the properties of the ground.

Note that the present invention is applicable not only to earth augers but also to a two-shaft drive device including a cylindrical outer shaft and an inner shaft disposed inside the cylindrical outer shaft in various construction machines.

(Example) Hereinafter, the present invention will be specifically described based on illustrated examples.

1 to 3 show an earth auger to which the present invention is applied.

As shown in FIG. 1, in this earth auger, a leader 4 is supported by a crane body 1 via a backstay 2 and a support cylinder 3, and an auger machine 6 is attached to a guide rail 5 provided over the entire length of the leader 4. is arranged so that it can be raised and lowered freely. The auger machine 6 has a cylindrical casing 8 provided with an auger screw 7, and a torque tube 9 concentrically inserted into the casing 8, which are rotatably disposed vertically. However, torque tube 9
A cutter head 10 is removably fixed to the lower end of the cutter.

As shown in FIG. 2, the auger machine 6 has two drive motors 12 and 13 installed on the top surface of the cover plate 11a of the gear case 11.
Pinions 12a and 13a which are rotationally driven by the gear case 11 are arranged inside the gear case 11, and a fixing ring 14 is fixed to the lower surface of the cover plate 11a via a bolt 14a. However, casing 8
It is composed of a main cylinder part 8a on which the auger screw 7 is fixedly mounted, and an upper cylinder part 8b connected to the upper end of the main cylinder part 8a by bolts on the opposing flange part, and the upper cylinder part 8b
is arranged to protrude into the gear case 11, and a ring-shaped external gear 15 is fixed concentrically to the upper end flange portion 8c by bolts 15a. Also, the upper end of the torque tube 9 is also connected to the gear case 11.
The upper end flange portion 9c is arranged to protrude into the interior of the
A ring-shaped internal gear 16 is concentrically fixed to the holder by bolts 16a.

The external gear 15 is rotatably fitted on the outside of the fixed ring 14 via a bearing 17a and meshes with the pinion 12a, and the internal gear 16 is similarly fitted with a bearing 17 on the inside of the fixed ring 14.
The pinion 13a is rotatably fitted via b.
It meshes with.

In the earth auger with the above configuration, as shown in Figure 3,
The casing 8 rotates as the pinion 12a rotates due to drive of the drive motor 12, and the torque tube rotates as the pinion 13a rotates due to the drive of the drive motor 13. Therefore, the rotational speed of the casing 8 and torque tube 9 can be adjusted individually according to the hardness, viscosity, and other properties of the ground to be excavated, thereby maximizing excavation efficiency for any ground. becomes possible. Therefore, the auger machine has a triple ring structure for the rotational drive part, and can be extremely small and lightweight, requires little lifting torque, and can be manufactured at low cost.

(Effects Unique to the Invention) According to the two-shaft drive device for construction machinery of the present invention, a ring-shaped external gear fixed to the end of the cylindrical outer shaft, and a ring-shaped external gear disposed concentrically inside the outer shaft. A ring-shaped internal tooth gear fixed to the end of the inner shaft is rotatably fitted inside and outside of a fixed ring fixed to the mounting base via bearings, and both gears are driven separately. Since they are meshed with the pinions rotated by the motor, the rotational speed of both shafts can be adjusted individually for rotational operation.Moreover, in the drive section, both of the gears are concentrically integrated with the fixed ring. Since the structure is extremely simple with a triple ring structure, it is easy to reduce the size and weight, and it can be manufactured at low cost.

Further, according to the present invention, an external gear which is a gear reducer of a drive motor that rotationally drives a cylindrical outer shaft, and a drive motor that rotationally drives an inner shaft that is arranged concentrically inside the cylindrical outer shaft. A fixing ring fixed to the mounting base is arranged concentrically between the internal gear of the gear reducer, and both the inner and outer gears are supported by bearings on the inner and outer peripheries of the fixing ring. The external gear and the internal gear are firmly and rotatably supported by a fixed ring and bearings on the inner and outer peripheries of the fixed ring, and can be provided at approximately the same horizontal level with the fixed ring in between, and one of them can be mounted on the outside. The pinions of the two drive motors are configured as a toothed gear and the other as an internal gear to prevent them from interfering with each other, so that the external gear and the pinion that meshes with the external gear and the internal gear and the pinion that meshes with it. The earth auger can be installed on substantially the same horizontal level as the earth auger, which reduces the overall length of the earth auger, lowers the center of gravity, and enables stable excavation work, while also increasing excavation efficiency.

[Brief explanation of the drawing]

FIG. 1 is a side view of an earth auger which is an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the main parts thereof, and FIG. 3 is a plan view of the gear portion of the drive unit. 8... Casing (cylindrical outer shaft), 9... Torque tube (inner shaft), 11... Gear case (mounting base), 12, 13... Drive motor, 12a, 13
a...Pinion, 14...Fixing ring, 15...
External gear, 16... Internal gear, 17a, 17b...
…bearing.

Claims (1)

[Scope of utility model registration request] A ring-shaped external gear is fixed to the end of the cylindrical outer shaft, and a ring-shaped internal gear is fixed to the end of the inner shaft, which is arranged concentrically inside the outer shaft. A fixed ring is concentrically fixed to the mounting base between the toothed gear, and the external toothed gear is placed on the outside of the fixed ring.
The internal gears are rotatably supported on the inside through bearings, and the mounting base includes:
A construction machine equipped with a pinion and its drive motor that mesh with the external gear to rotationally drive the cylindrical outer shaft, and a pinion and its drive motor that mesh with the internal gear and drive the inner shaft to rotate. Two-axis drive device.