JP2017122003A - Mobile crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile crane that can secure a space in which a body is immersed in a maintenance work in the vicinity of an engine box.SOLUTION: The mobile crane 1 includes: a travelling body 10; and a rotating base 12 mounted to the travelling body 10 so as to be rotatable, in the rotating base 12, a width of a rear part be formed narrower than a width of the travelling body 10. The rotating base 12 includes a counter weight 19 at the rear end thereof. A width of the counter weight 19 is formed so as to be substantially same as the rear part of the rotating base 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mobile crane having a swivel mounted on a traveling body.

  In some mobile cranes, a swivel is mounted on a traveling body, and an engine box is installed at the rear end of the traveling body so as to protrude upward (see cited document 1). The engine box has a shape that does not interfere with the rear end of the swivel in a running posture (a state in which the direction of the swivel and the traveling body coincides).

JP 2004-83224 A

  However, in the conventional mobile crane including the configuration of the cited document 1, when the inspection or maintenance of the engine or the like at the rear end portion of the traveling body is performed in the traveling posture, the swivel becomes an obstacle and it is difficult to work. It was. In other words, even if the engine box and torque converter cover can be opened in the running position, the swivel base is present in the space in front of the opening, and the space is narrow and limited. It was difficult to work.

  Therefore, an object of the present invention is to provide a mobile crane that can secure a space for allowing the body to enter during maintenance work near the engine box.

  In order to achieve the above object, a mobile crane according to the present invention is a traveling body and a swivel that is pivotably mounted on the traveling body, and has a rear width narrower than a width of the traveling body. And a swivel.

  Thus, the mobile crane of the present invention is a traveling body, and a swivel that is rotatably mounted on the traveling body, the rear part having a width smaller than the width of the traveling body, It is characterized by having. With such a configuration, a space for allowing the body to enter during maintenance work near the engine box can be secured.

It is a side view of the mobile crane of an Example. It is a top view of the mobile crane of an Example. It is a top view which shows the positional relationship of the traveling body and swivel of a prior art example. It is a top view which shows the positional relationship of the traveling body of an Example, and a turntable. It is a rear view which shows the positional relationship of the traveling body and swivel of a prior art example. It is a rear view which shows the positional relationship of the traveling body of an Example, and a turntable. It is a top view which shows the turning angle of the turntable of a prior art example. It is a top view which shows the turning angle of the turntable of an Example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Hereinafter, a rough terrain crane will be described as an example of the mobile crane, but the present invention is not limited to this. The present invention can be applied to other mobile cranes such as an all terrain crane.

(overall structure)
First, the whole structure of the rough terrain crane 1 as a mobile crane of this invention is demonstrated using FIG. 1, FIG. The rough terrain crane 1 of the present invention is attached to a traveling body 10 which is a main body portion of a vehicle having a traveling function, outriggers 11,... And a boom 14 attached to a bracket 13 erected on the swivel base 12.

  Although the traveling body 10 is formed in the shape of a flat carriage as a whole, an engine (not shown) is disposed at the rear end, and an engine box 10a for housing the engine and a ventilation device 10d protrude upward. It is installed to do. The engine box 10a includes a maintenance opening on the side facing the vehicle front side, and the opening is closed by a removable plate. Further, an oil supply port 10b for a torque converter is disposed in front of the engine box 10a. The torque converter oil supply port 10b is closed by a removable plate. As is well known, since the torque converter uses oil, it is necessary to supply oil by opening the torque converter oil supply port 10b every predetermined period.

  The swivel base 12 has a pinion gear to which the power of the swivel motor is transmitted, and the pinion gear meshes with a circular gear provided on the traveling body 10 to rotate around the swivel axis. The swivel base 12 is configured by attaching various devices to a pair of left and right swivel frames 120 extending in the front-rear direction. Specifically, the swivel base 12 includes a bracket 13 in which the rear portion of the swivel frame 120 protrudes upward, a boom 14 that can be raised and lowered on the bracket 13, and winches disposed on the left and right of the rear portion of the swivel frame 120. The housing 17 is mainly composed of a cockpit 18 disposed on the front right side and a counterweight 19 installed on the rear end surface of the winch housing 17.

(Plane configuration of swivel)
Next, the plan configuration of the rear part of the swivel base 12 of the conventional example and the plan configuration of the rear part of the swivel base 12 of the present embodiment will be described using the plan views of FIGS. 3 and 4. As shown in FIG. 3, the rear part of the swivel base 12 of the conventional example has winch accommodating portions 17 on the left and right of the swivel frame 120 (or the bracket 13). The lateral width of the winch accommodating portion 17 is the traveling body 10. The width is substantially the same. And since the counterweight 19 arrange | positioned at the rear end of the turntable 12 is also installed in the full width of the turntable 12, the width of the counterweight 19 is substantially the same as the width of the traveling body 10. Further, a stage 10c and a step 10e, which will be described later, are not installed in the right rear portion of the traveling body 10.

  On the other hand, as shown in FIG. 4, the swivel base 12 of the present embodiment has winch accommodating portions 17 on the left and right of the swivel frame 120 (or the bracket 13), and the lateral width of the winch accommodating portion 17 is It is narrower than the lateral width of the traveling body 10. In other words, the front portion of the swivel base 12 is formed to have substantially the same lateral width as the traveling body 10, while the right side of the winch accommodating portion 17 is the front portion of the swivel base 12 via the tapered portion 171 that gradually decreases in width. It is connected with. Further, the left side of the winch accommodating portion 17 is connected to the front portion of the swivel base 12 via a step portion 172.

  With such a structure, a working space is secured on the side of the winch housing portion 17 (on both sides) on the traveling body 10. That is, a space corresponding to the narrowed lateral width is created on the traveling body 10 as much as the lateral width is narrower than that of the traveling body 10.

  Furthermore, in the swivel base 12, by narrowing the lateral width in the vicinity of the rear end away from the turning center, the turning angle in a narrow place where the wall is approaching can be increased as described later. However, in consideration of securing the weight of the counterweight 19 described later, accommodating the winch, using the flat surface on the upper part of the winch accommodating portion 17 as a working scaffold, etc. The predetermined width is secured without making the lateral width narrower than necessary.

  And since the counterweight 19 arrange | positioned at the rear end of the turntable 12 is installed in the full width of the turntable 12, the horizontal width of the counterweight 19 is also narrower than the horizontal width of the traveling body 10. FIG. That is, the counterweight 19 is formed in a plate shape with a substance having a large specific gravity (for example, steel) and is attached to the rear end of the swivel base 12 so as to be attached along the shape of the swivel base 12. As the lateral width of the rear end of the table 12 is reduced, the lateral width of the counterweight 19 is also reduced. The counterweight 19 has a lateral width that is narrow, while a specific gravity greater than that of the conventional weight is ensured by increasing the specific gravity as compared with the conventional weight.

  Furthermore, a stage 10c is installed at the right rear part of the traveling body 10 as a scaffold for work during maintenance, and a step 10e is installed on the rear end surface of the traveling body 10 for the operator to move up and down. ing. By arranging in this way, the operator steps on the step 10e from the rear end of the traveling body 10 and ascends on the traveling body 10 and approaches the engine box 10a and the torque converter fuel filler opening 10b via the stage 10c. Can do maintenance work.

(3D structure of swivel)
Next, with reference to the rear views of FIGS. 5 and 6, the three-dimensional configuration of the rear part of the swivel base 12 of the conventional example and the three-dimensional structure of the rear part of the swivel base 12 of the present embodiment will be described. In the conventional example, as shown in FIG. 5, the traveling body 10 includes an engine box 10a and a ventilation device 10d that protrude upward. The swivel base 12 includes a counterweight 19 whose upper side edges are chamfered. That is, the outer side of the winch accommodating part 17 at the rear part of the swivel base 12 is chamfered at both upper side edges, and the counterweight 19 is also attached so as to follow the shape of the winch accommodating part 17. Further, a stage 10c and a step 10e, which will be described later, are not installed in the right rear portion of the traveling body 10.

  On the other hand, in the present embodiment, as shown in FIG. 6, the traveling body 10 includes an engine box 10a and a ventilation device 10d that protrude upward as in the conventional example. The swivel base 12 includes a counterweight 19 having a chamfered portion 191 whose lower side edges are chamfered obliquely. That is, the outer side of the winch housing portion 17 at the rear of the swivel base 12 is narrower in width than the front portion of the swivel base 12, and both side edges of the lower part are chamfered. It is attached along the shape. A stage 10 c and a step 10 e are installed at the right rear part of the traveling body 10.

(Function)
Next, the turning angle of the swivel base 12 of the conventional example and the turning angle of the swivel base 12 of the present embodiment will be described using the plan views of FIGS. Here, the case where the wall 90 is perpendicular to the position of 1500 mm in the vehicle width direction from the vehicle center will be described. As shown in FIG. 7, the swivel base 12 of the conventional example has a swivelable angle of 5.52 degrees, and the horizontal movement distance of the suspended load from 0 degrees forward of the posture of the boom maximum working radius of 27.9 m is 2 .68m. As shown in FIG. 7, the turning angle in this case is maximized at the position where the rear corner of the swivel base 12 (the rear corner of the winch housing portion 17, the end of the counterweight 19) contacts the wall 90.

  On the other hand, as shown in FIG. 8, the swivel base 12 of this embodiment has a turnable angle of 9.10 degrees as a result of narrowing the width of the swivel base 12 by 0.2 m on one side in the vehicle width direction. The horizontal movement distance of the suspended load from 0 ° in the posture with the maximum boom working radius of 27.9 m is 4.44 m. As shown in FIG. 8, the turning angle in this case is maximized at the position where the rear corner of the swivel base 12 (the rear corner of the winch housing portion 17, the end of the counterweight 19) contacts the wall 90. The rear corner is positioned on the inner side by the reduced width, and conversely, the turning angle can be increased accordingly. As shown in FIG. 8, under this condition, the front corner of the tapered portion 171 is also formed so as to contact the wall 90 almost simultaneously. Therefore, in order to narrow the lateral width of the rear part of the swivel base 12 for the purpose of widening the swivelable angle, it is necessary to widen the range to be narrowed simultaneously to a position closer to the front.

  Further, in this embodiment, as shown in the rear view of FIG. 6, the lower side edge of the winch housing portion 17 and the lower side edge (corner) of the counterweight 19 are chamfered. For this reason, when there is a wall having a height just equal to the chamfered portion 191 (lower corner) of the counterweight 19, the turning angle should be increased by the horizontal width of the chamfered portion 191. Can do.

(effect)
Next, the effects produced by the rough terrain crane 1 as the mobile crane of this embodiment will be listed and described.

(1) As described above, the rough terrain crane 1 as a mobile crane according to the present embodiment is a traveling body 10 and a swivel 12 that is rotatably mounted on the traveling body 10 and has a rear width. And a swivel 12 that is formed narrower than the width of the traveling body 10. With such a configuration, it is possible to secure a space for allowing the body to enter during maintenance work near the engine box 10a. That is, even in the traveling posture, the engine box 10a and the torque converter oiling port 10b are opened from the space beside the swivel base 12, and the body (upper body) can be easily invaded to work.

  Furthermore, the turning angle can be increased even in a narrow place where the wall 90 approaches. That is, the turning angle can be increased by the narrowed width of the winch accommodating portion 17, thereby increasing the moving distance of the suspended load.

(2) Further, the swivel base 12 has a counterweight 19 at the rear end, and the width of the counterweight 19 is formed substantially the same as the rear part of the swivel base 12. Since it is such a structure, it does not become a hindrance when working in the vicinity of the engine box 10a at the time of a maintenance, and a turning angle can be enlarged.

(3) Furthermore, the swivel base 12 has a winch housing part 17 at the rear part, and the left and right side edges of the lower part of the exterior of the winch housing part 17 are obliquely chamfered. Since it is such a structure, it becomes easy to access the engine box 10a and the oil port 10b for torque converters from the side of the winch accommodating part 17. FIG.

  In addition, when the side edge of the lower part of the winch accommodating part 17 and the side edge (corner) of the lower part of the counterweight 19 are chamfered, there is a wall having a height equivalent to the chamfered part 191. The turning angle can be increased by the width of the chamfered portion 191.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to the present invention. included.

  For example, in the embodiment, the case where the width of the winch accommodating portion 17 is reduced as an aspect of reducing the width of the rear portion of the swivel base 12 is not limited to this. The width of the predetermined range in the vicinity may be narrow.

  Moreover, although the Example demonstrated the case where the width | variety of the counterweight 19 was formed in the width | variety substantially the same as the rear part of the swivel stand 12, it is not limited to this. The width of the counterweight 19 can be formed to be narrower than the width of the rear portion of the swivel base 12 although the weight is small.

1: Rough terrain crane (mobile crane);
10: traveling body;
10a: engine box; 10b: oil inlet for torque converter;
10c: Stage; 10d: Ventilator; 10e: Step;
12: swivel;
17: winch housing part; 18: cockpit;
19: Counterweight; 191: Chamfered portion;
120: Swivel frame; 121: Heel part

Claims (3)

A mobile crane,
A traveling body,
A swivel mounted to the traveling body so as to be capable of swiveling, wherein the width of the rear part is formed narrower than the width of the traveling body;
A mobile crane comprising   The mobile crane according to claim 1, wherein the swivel base has a counterweight at a rear end, and the width of the counterweight is formed substantially the same as the rear part of the swivel base. 3. The mobile type according to claim 1, wherein the swivel base has a winch accommodating portion at a rear portion, and is formed by obliquely chamfering left and right side edges of a lower portion of the exterior of the winch accommodating portion. crane.