JP5163546B2 - Work machine - Google Patents

Description

  The present invention relates to a work machine provided with a turning mechanism for a work machine.

  Turning Conventionally, a swing bearing inner ring and the outer ring are rotatably connected to each other, and internal gear provided inside of the inner ring, and turning a pinion that rotates in mesh with the internal gear, which rotates the pivot pinion 2. Description of the Related Art A turning mechanism for a work machine provided with a drive source is known.

  For example, in the turning mechanism for a working machine disclosed in Patent Document 1, the first-stage helical gear and the second-stage sun gear are divided in a rotation speed reducer including a first-stage helical gear and a second-stage planetary gear device, and Both gears are spline-fitted together.

Japanese Utility Model Publication No. 1-93256

  However, in the hydraulic excavator having the turning mechanism for a work machine disclosed in Patent Document 1, the rotation shaft of the turning drive source is disposed on the front side of the turning pinion shaft. For this reason, in order to avoid contact between the attachment of the excavator and the turning drive source, there is a problem that the maximum upright angle of the attachment cannot be increased.

  The present invention has been made in view of such a point, and an object of the present invention is to allow the work machine turning mechanism to be arranged in a limited space while preventing contact with the work machine attachment. It is in.

  In order to achieve the above object, according to the present invention, the rotation shaft of the turning drive source is arranged to be offset backward in parallel to the turning pinion shaft.

Specifically, in the first invention, an inner ring and an outer ring are rotatably connected to each other, and a slewing bearing having an inner gear inside the inner ring,
An upper swing body connected to the outer ring so as to rotate together;
A swivel pinion that meshes with and rotates with the internal gear;
A turning drive source that is fixed to the upper turning body and that drives the turning pinion to rotate;
The present invention is directed to a work machine including an attachment that is supported to be able to undulate in a front-rear direction with a horizontal rotation shaft in front of the turning drive source in the upper turning body.

And the rotation shaft of the turning drive source is gear-coupled to the turning pinion shaft, and is arranged to be offset backward in parallel to the turning pinion shaft,
The turning pinion and the attachment are configured to overlap each other in a plan view at the maximum upright angle of the attachment.

  That is, in a work machine represented by a so-called small rear turning shovel, it is necessary to raise the attachment as much as possible in order to reduce not only the rear but also the forward turning radius. The attachment moves on the pinion. For this reason, an attachment becomes easy to contact the turning drive source which drives a turning pinion. However, according to the above configuration, the rotation shaft of the turning drive source is arranged to be offset backward in parallel with the turning pinion shaft, so that contact between the attachment and the turning drive source at the maximum standing angle is avoided. .

  According to a second invention, in the first invention, the gear coupling portion that couples the rotating shaft and the orbiting pinion shaft has at least one or more planetary gear reduction portions on the orbiting pinion shaft, and the planetary gears. A plurality of spur gears or helical gears are connected between the speed reducer and the rotating shaft.

  According to the above configuration, the turning drive source can be connected to a general-purpose turning speed reducer having at least one planetary gear speed reduction unit on the turning pinion shaft via a plurality of spur gears or helical gears. The parts can be shared and the existing working machine turning mechanism can be modified.

  In a third invention, in the first or second invention, the reduction ratio of the gear coupling portion is 1 or more.

  According to the above configuration, since the rotation pinion shaft can be driven by decelerating the rotation shaft of the rotation drive source, a high-speed and low-torque electric motor can be used as compared with the hydraulic motor. The electric motor has a larger volume than a low-speed, high-torque hydraulic motor, but avoids contact between the attachment and the electric motor by arranging the rotation shaft of the turning drive source to be offset backward in parallel to the turning pinion shaft. As a result, the maximum upright angle of the attachment can be increased.

In the fourth invention, in the third invention,
The gear coupling portion is disposed below the horizontal rotation shaft.

  That is, in a work machine with small rear turning, the turning pinion shaft is closer to the front than in a normal working machine due to the positional relationship with the turning bearing, but according to the above configuration, the turning shaft of the turning drive source is turned. Since it is arranged to be offset rearward in parallel with the pinion shaft, the height of the gear coupling portion can be reduced, and the gear coupling portion can be brought directly under the rotation shaft of the attachment base end.

  As described above, according to the first aspect of the present invention, the rotation shaft of the turning drive source that is gear-coupled to the turning pinion shaft is arranged to be offset backward in parallel with the turning pinion shaft. The mechanism can be placed in a limited space while preventing contact with the work machine attachment.

  According to the second aspect of the present invention, the gear coupling portion is constituted by one or more general planetary gear reduction portions and a plurality of spur gears or helical gears, so that parts can be shared and costs can be reduced. can do.

  According to the third aspect of the invention, the rotating shaft of the turning drive source is decelerated to drive the turning pinion shaft, so that a high-speed and low-torque electric motor can be used and the electric motor has a larger volume than the hydraulic motor. Since it is possible to avoid contact with the attachment at the maximum standing angle even if is used, it can also be applied to a hybrid work machine or the like that does not use a hydraulic motor as a turning drive source.

  According to the fourth aspect of the present invention, the gear coupling portion is disposed below the horizontal rotation shaft, so that the limited space such as the rear small turning work machine can be effectively used while preventing contact with the attachment. Can do.

It is a side view which shows the turning mechanism for working machines concerning the embodiment of this invention, and its periphery. It is the perspective view which looked at the turning mechanism for working machines concerning the embodiment of the present invention, and its circumference from the back side. It is a bottom view which shows the turning mechanism for working machines, and a turning frame. It is a schematic diagram explaining the outline | summary of the turning mechanism for work machines. It is a perspective view which expands and shows an electric motor, a gear coupling part, and a turning pinion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG.1 and FIG.2 shows the principal part of the hybrid shovel 1 as a working machine provided with the turning mechanism for working machines of embodiment of this invention. This hybrid excavator 1 is a so-called rear small turning type excavator, and is freely rotatable via a lower traveling body 3 having a crawler 2 and a turning mechanism 4 as a working machine turning mechanism with respect to the lower traveling body 3. And an upper revolving body 5 to be supported. At the center of the swivel frame 6 serving as the base of the upper swivel body 5 is formed an attach support portion 6a that bulges upward in a triangular shape in a side view, and a horizontal pivot shaft 7 supported by the attach support portion 6a. The attachment 8 is supported so as to be rotatable forward and backward. 1 and 2, only the base end side of the lower boom of the attachment 8 is shown, and the configuration of the attachment 8 is not particularly limited.

  The turning mechanism 4 includes a turning bearing 10 in which an inner ring 11 and an outer ring 12 are rotatably connected to each other. As shown in FIGS. 3 and 4, the slewing bearing 10 of the present embodiment is, for example, a ball bearing having a ball 10 a, and an inner gear 11 a is formed on the entire inner circumference of the inner ring 11. The inner ring 11 is fastened to the bearing mounting flange 3a of the lower traveling body 3 by lower bearing bolts 11b. On the other hand, the outer ring 12 is fastened to the turning frame 6 by an upper bearing bolt 12a. And it is comprised so that the rotation pinion 13 may mesh and rotate with the internal gear 11a. The turning pinion 13 is rotationally driven by an electric motor 14 as a turning drive source. The electric motor 14 is fixed behind the horizontal rotation shaft 7 of the revolving frame 6.

  Specifically, the rotating shaft 16 (output shaft) of the electric motor 14 is gear-coupled to the turning pinion shaft 13a. The rotating shaft 16 is further offset in the rearward direction in parallel with the turning pinion shaft 13a. Usually, in the rear small turning type hybrid excavator 1, it is necessary to make the attachment 8 stand up largely in order to reduce not only the rear but also the turning radius of the front, and the maximum standing angle of the attachment 8 is larger than that of a normal shovel. It becomes larger (90 ° or more with respect to the ground). For this reason, the turning pinion 13 and the attachment 8 overlap each other in plan view. In other words, the attachment 8 is configured to be directly above the turning pinion 13 at the maximum standing angle.

  As schematically shown in FIG. 4, the gear coupling portion 15 includes a lower portion 15 a having one or more stages, for example, two-stage planetary gear reduction portions 17, and an upper portion 15 b having a plurality of, for example, two spur gears 18, 19. Has been. The planetary gear speed reduction part 17 in the lower part 15a is gear-coupled to the turning pinion shaft 13a, and the spur gears 18 and 19 in the upper part 15b are gear-coupled to the rotary shaft 16. A flange portion 14 a formed at the lower end of the electric motor 14 is fastened to the upper portion 15 b with a motor fixing bolt 50. The lower end flange portion 15 c of the lower portion 15 a is fastened to the revolving frame 6 with a drive source fixing bolt 51. The lower part 15a can be used in common with a general-purpose turning speed reducer. If the upper part 15b is a separate part, the parts can be shared and the existing hybrid excavator 1 can be modified. It becomes possible.

  Then, as shown in FIG. 1, the height h of the front side 15 d of the upper portion 15 b is lowered by the offset of the rotating shaft 16 to the rear, and the gear coupling portion 15 is disposed below the horizontal rotating shaft 7. Has been.

  The reduction ratio of the gear coupling portion 15 is 1 or more, that is, a reduction. That is, the first spur gear 18 on the electric motor 14 side has a smaller diameter than the second piece gear 19 on the planetary gear reduction unit 17 side. For this reason, since the rotating shaft 16 of the electric motor 14 can be decelerated and the turning pinion shaft 13a can be driven, the electric motor 14 having high speed and low torque can be used as compared with the hydraulic motor.

  In addition, the electric motor 14 has a larger volume than the low-speed, high-torque hydraulic motor, but in this embodiment, the rotating shaft 16 of the electric motor 14 is arranged to be offset backward in parallel to the turning pinion shaft 13a. Therefore, contact between the attachment 8 and the electric motor 14 at the maximum standing angle is avoided.

  Therefore, according to the turning mechanism 4 according to the present embodiment, the rotating shaft 16 of the electric motor 14 that is gear-coupled to the turning pinion shaft 13a is arranged in parallel with respect to the turning pinion shaft 13a so as to be offset rearward. Can be disposed in a limited space while preventing contact with the attachment 8 of the hybrid excavator 1.

  Further, even if the electric motor 14 having a large volume is used, contact with the attachment 8 at the maximum standing angle can be avoided, so that the hybrid excavator 1 using the electric motor 14 instead of the hydraulic motor is particularly advantageous.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above embodiment, the work machine is the hybrid excavator 1, but the present invention is not limited to this, and the present invention can also be applied to a machine that includes a hydraulic motor instead of the electric motor 14 as a turning drive.

  In the above embodiment, the gear coupling portion 15 is configured by the lower portion 15a having the two-stage planetary gear reduction portion 17 and the upper portion 15b having the two spur gears 18 and 19, but the gear coupling portion 15 has three or more stages. The lower part 15a which has the planetary gear reduction part 17 may be provided, and the upper part 15b which has the three spur gears 18 and 19 may be provided.

  In the above embodiment, the planetary gear reduction unit 17 and the rotating shaft 16 are connected by the plurality of spur gears 18 and 19, but may be connected by a plurality of helical gears.

  Furthermore, in the rear small turning hybrid excavator 1, the turning pinion shaft 13 a is closer to the front than in the normal hybrid excavator 1 due to the positional relationship with the turning bearing 10. Since the height h of the front side 15d of the upper portion 15b is reduced, the gear coupling portion 15 can be brought directly under the rotation shaft at the base end of the attachment 8.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

1 Hybrid excavator (work machine)
DESCRIPTION OF SYMBOLS 4 Turning mechanism 5 Upper revolving body 7 Horizontal turning shaft 8 Attachment 10 Turning bearing 11 Inner ring 11a Internal gear 12 Outer ring 13 Turning pinion 13a Turning pinion shaft 14 Electric motor (turning drive source)
15 Gear coupling portion 16 Rotating shaft 17 Planetary gear speed reduction portion 18, 19 Spur gear

Claims (4)

A slewing bearing in which an inner ring and an outer ring are rotatably connected to each other, and an inner gear is provided inside the inner ring;
An upper swing body connected to the outer ring so as to rotate together;
A swivel pinion that meshes with and rotates with the internal gear;
A turning drive source that is fixed to the upper turning body and that drives the turning pinion to rotate;
A work machine including an attachment supported to be able to undulate in a front-rear direction with a horizontal rotation shaft in front of the turning drive source in the upper turning body,
The rotation shaft of the turning drive source is gear-coupled to the turning pinion shaft and is arranged to be offset backward in parallel to the turning pinion shaft,
A working machine configured to overlap the turning pinion and the attachment in a plan view at a maximum standing angle of the attachment. The work machine according to claim 1,
The gear coupling unit that couples the rotating shaft and the swivel pinion shaft has at least one or more planetary gear speed reducers on the swivel pinion shaft, and there are a plurality of spaces between the planetary gear speed reducing unit and the rotating shaft. A working machine connected by a spur gear or a helical gear. In the work machine according to claim 1 or 2,
A reduction gear ratio of the gear coupling portion is 1 or more. The work machine according to claim 3,
The work machine, wherein the gear coupling portion is disposed below the horizontal rotation shaft.

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