JP2010138563A - Device for protecting working vehicle falling sideways - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively protect a head guard when a vehicle body falls. <P>SOLUTION: This device includes: the head guard 15 which is installed in an driver seat 14 on the vehicle body 11; a rear pillar 16 which is erected at the rear of the vehicle body 11; a pair of right and left working booms 18 base ends of which are supported in a vertically-rotatable manner by the rear pillar 16, and elongated to the front of the vehicle body 11 through both sides of the driver seat 14; and a bucket 22 which is supported in a vertically-rotatable manner at the tip of the working boom 18. The working boom 18 is formed in a trapezoidal chevron shape in a lateral view, and an upside 22b of its top portion is formed to be set at a height equivalent to that of a ceiling surface 16U of the head guard 16 at the limit of descent. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rollover protection device for a work vehicle.

  As a device that protects the driver in the driver's seat when the work vehicle falls, for example, a “vehicle fall protection device” disclosed in Patent Document 1 has been proposed. This is a work in which a pair of rear pillars that support the left and right excavator arms in a vertically swingable manner are installed at the rear of the vehicle body, and a head guard (also called a canopy) installed between the left and right excavator arms is installed at the center of the vehicle body. In the vehicle, a safety support bar having the same height as the head guard is installed between the rear pillars.

In the work vehicle described above, the height of the rear pillar is close to the ceiling of the head guard, so there is a certain degree of head guard protection, and the strength of the rear pillar is increased by passing a safety support bar between the rear pillars. It is possible to prevent crushing of the head guard at the time of inversion.
Japanese Utility Model Publication No. 63-114752

However, although the head guard can be prevented from being collapsed during reversal, the front part of the head guard is not protected, and in particular, there is a problem that the protection of the front part of the head guard is insufficient during rollover. For this reason, it is necessary to give the head guard sufficient strength, which increases the weight and cost.
An object of the present invention is to solve the above-mentioned problems and to provide a rollover protection device for a work vehicle that can effectively protect a head guard even when the vehicle body falls and can reduce weight and cost.

  According to the first aspect of the present invention, a head guard is provided in a driver's seat installed on a vehicle body having a traveling device, and a base end portion is rotatably supported in a vertical direction on a rear pillar unit installed in a rear part of the vehicle body. And a pair of left and right work booms, the tip part of which reaches the front of the vehicle body through both sides of the driver's seat, and a rollover protection device for a work vehicle provided with a work tool at the tip part of these work booms, The work boom is formed in a mountain shape in a side view, and the top portion is formed at a height corresponding to the ceiling portion of the head guard at the lower limit.

According to a second aspect of the present invention, in the configuration of the first aspect, the work boom has a trapezoidal mountain shape including a rear oblique side, a top upper side, and a front oblique side.
According to a third aspect of the present invention, a head guard is provided in a driver's seat installed on a vehicle body having a traveling device, and a base end portion is supported by a rear pillar unit installed in a rear portion of the vehicle body so as to be rotatable in the vertical direction. And a pair of left and right working booms, the tip part of which reaches the front of the vehicle body through both sides of the driver's seat, and a rollover protection device for a work vehicle provided with a work tool at the tip part of these work booms. A rod-shaped side guard that is attached from the base end side to the tip end side of the boom and has a trapezoidal mountain shape when viewed from the side, with the top side of the top corresponding to the ceiling of the head guard at the lower limit. Is.

  According to the first aspect of the present invention, when the work vehicle rolls over, the head guard and the driver's seat can be protected by the mountain-shaped work boom. As a result, it is possible to reduce the strength of the head guard, and it is not necessary to install a special protective member, so that weight reduction and cost reduction can be achieved.

  According to the invention described in claim 2, by providing the trapezoidal mountain-shaped work boom, the left and right view from the driver's seat is not obstructed, and a wide view can be secured from the driver's seat during the cargo handling work. Safety and workability can be improved. Further, since the mountain-shaped trapezoidal work boom can protect against a fall, the strength of the head guard can be reduced, and the weight of the head guard can be reduced and the cost can be reduced.

  According to the invention described in claim 3, when the work vehicle rolls over or reverses, the head guard and the driver's seat can be protected by the side guard. As a result, the strength of the head guard can be reduced, and the weight and cost of the head guard can be reduced. Further, the side guard can be easily installed on the work boom exposed at the left and right side portions of the vehicle body, and can be easily added to the existing work vehicle.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Embodiment]
An embodiment of a rollover protection device for a work vehicle according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, this work vehicle is a skid steer loader that is a small earthwork vehicle, for example, and has an independently driven front wheel 12 and a rear wheel 13 driven by an engine on both sides of a vehicle body 11. A front-rear traveling that rotates by rotating the left and right front and rear wheels 12, 13 in the same direction, a turning traveling that rotates by rotating the left and right front-rear wheels 12, 13 at a higher speed than the other, and the left and right front-rear wheels A traveling device capable of in-situ turning by turning in the relative direction of 12, 13 is equipped.

  A driver's seat 14 is provided at the center of the vehicle body 11, and a head guard 15 that covers the left and right side surfaces, the rear surface, and the ceiling portion 15 </ b> U is installed in the driver seat 14, and the front surface thereof is opened as an entrance / exit. Further, a window 15W having a safety lattice is provided on the left and right side surfaces of the head guard 15, and an opening 15S is formed on the back surface, thereby ensuring visibility.

  A pair of left and right rear pillars 16 are erected on both sides of the rear part of the vehicle body 11, and a pair of left and right work booms 18 whose base ends are supported by the rear pillars 16 via a horizontal support shaft 17 so as to be rotatable up and down. Is provided. These work booms 18 are provided with a boom main body 20 that is disposed on both sides of the head guard 15 and also serves as a rollover protection member, and a work member 21 that supports a bucket 22 that is a work tool so as to be rotatable up and down. The boom main body 20 is formed in a rectangular tube shape, and is substantially the same as the rear hypotenuse 20a rising from the base end portion supported by the support shaft 17 while tilting upward at the lower limit and the ceiling portion 15U of the head guard 15. A top top side 20b having a height and a front oblique side 20c inclined downward from the front end of the top top side 20b are formed in a trapezoidal mountain shape in a side view.

  The top upper side 20b of the boom body 20 is formed at a length LB slightly longer than the length LG of the ceiling portion 15U at a predetermined distance from the ceiling portion 15U of the head guard 15, and at a position corresponding to the side of the ceiling portion 15U. Although it is arranged, the length LB of the top upper side 20b may be the same as the length LG of the ceiling portion 15U, and even if it is somewhat shorter, a sufficient protective function can be achieved.

  The working member 21 includes an L-shaped support plate 21P fixed to the front ends of the left and right front oblique sides 20c, and a horizontal frame 21F that connects the left and right support plates 21P. A boom cylinder 23 is connected to the rear portion of the vehicle body 11 between the attachment portion of the rear pillar portion 16 and the base end portion of the support plate 21P. Further, an attaching / detaching device 25 is supported at the front end of the horizontal member 21F via a support pin 24 so as to be swingable up and down, and the bucket 22 is detachably attached to the attaching / detaching device 25. Further, a pair of left and right bucket cylinders 26 are connected between the base end side of the support plate 21 </ b> P and the attachment / detachment device 25.

  Therefore, as shown in FIG. 4, by extending the boom cylinder 23, the work boom 18 is rotated upward from the descending limit about the support shaft 17 to lift the bucket 22 to the ascending limit, and the bucket cylinder 26 is expanded and contracted. By doing so, the cargo handling operation can be performed by swinging the bucket 22 in the vertical direction.

  According to the above configuration, as shown in FIG. 3, when the skid steer loader rolls over or reverses, the head guard 15 and the driver's seat 14 can be protected by the mountain-shaped trapezoidal work boom 18. Conventionally, during the cargo handling operation, the left and right obliquely lower fields of view seen by the driver from the seat 14a of the driver's seat 14 are blocked by the work boom and cannot be sufficiently secured. However, in this embodiment, the work boom is not secured. Since the boom body 20 of the 18 is formed in the shape of a mountain trapezoid and the boom body 20 of the work boom 18 is located above the driver's seat 14 during the cargo handling operation, the left and right obliquely lower fields of view are not obstructed. With this wide field of view, safety and workability can be improved. Further, since the mountain-shaped trapezoidal work boom 18 can protect against a fall, it is possible to reduce the strength of the head guard 15, and it is not necessary to install a special protective member. Reduction can be achieved.

[Other embodiments]
Another embodiment of a rollover protection device for a work vehicle according to the present invention will be described with reference to FIG. Note that the same members as those of the previous embodiment are denoted by the same reference numerals, and description thereof is omitted.

  A rod-shaped side guard 33 is attached to the upper part of the boom main body 32 of the work boom 31 formed in a straight line as in the prior art. The side guard 33 includes a rear oblique side 33a that rises obliquely upward from a rear connection tool 33d attached to the upper surface of the base end portion of the boom body 32, and a top upper side that is substantially the same height as the ceiling portion 15U of the head guard 15. A trapezoidal mountain shape in a side view with 33b, a front oblique side 33c that inclines downward from the front end of the top upper side 33b, and a front connector 33e that attaches the front end of the front oblique side 33c to the top surface of the tip of the boom body 32 Is formed. The top upper side 33 b of the side guard 33 is disposed at substantially the same height as the ceiling portion 15 U of the head guard 15 at the lower limit of the work boom 31.

  According to this embodiment, the head guard 15 and the driver's seat 14 can be protected by the side guard 33 when the skid steer loader rolls over or reverses. As a result, the strength of the head guard 15 can be reduced, and the weight and cost of the head guard 15 can be reduced. In addition, since the side guard 33 is attached to the work boom 31 exposed on the left and right side surfaces of the vehicle body 11, it is not necessary to separately install the attachment portion of the side guard 33 and can be easily installed and can be easily added to the existing skid steer loader. it can. Furthermore, the work boom 31 can be reinforced by the side guard 33.

1 is a side view showing an embodiment of a skid steer loader according to the present invention. It is a front perspective view of a skid steer loader. It is a rear view of a skid steer loader, (a) shows an upright posture and (b) shows a rollover posture. It is a side view of the state which raised the work boom to the upper limit. It is a side view which shows other embodiment of the skid steer loader which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Car body 14 Driver's seat 15 Head guard 15U Ceiling part 16 Rear pillar part 17 Support shaft 18 Working boom 20 Boom main body 20a Rear inclined part 20b Top upper side 20c Front oblique side 21 Working member 22 Bucket 23 Boom cylinder 26 Bucket cylinder 31 Working boom 32 Boom Main body 33 Side guard 33a Rear hypotenuse 33b Top upper side 33c Front hypotenuse

Claims (3)

A head guard is provided on a driver's seat installed on a vehicle body having a traveling device, and a base end portion is rotatably supported in a vertical direction on a rear pillar portion installed on a rear portion of the vehicle body, and both sides of the driver's seat are provided. A work vehicle rollover protection device provided with a pair of left and right work booms, the tip of which reaches the front of the vehicle body, and a work tool provided at the tip of these work booms,
A rollover protection device for a work vehicle, characterized in that the work boom has a mountain shape in a side view, and a top portion is formed at a height corresponding to a ceiling portion of a head guard at a descending limit. The work boom rollover protection device according to claim 1, wherein the work boom has a trapezoidal mountain shape including a rear oblique side, a top upper side, and a front oblique side. A head guard is provided on a driver's seat installed on a vehicle body having a traveling device, and a base end portion is rotatably supported in a vertical direction on a rear pillar portion installed on a rear portion of the vehicle body, and both sides of the driver's seat are provided. A work vehicle rollover protection device provided with a pair of left and right work booms, the tip of which reaches the front of the vehicle body, and a work tool provided at the tip of these work booms,
A rod-shaped side guard that is attached from the base end side to the tip end side of the work boom and has a trapezoidal mountain shape when viewed from the side, with the top side at the height corresponding to the head guard ceiling at the descending limit is provided. A rollover protection device for a work vehicle characterized by that.

Images