Working machine

Abstract

In a wheel loader 3, an angle formed by a first line segment L1 connecting a pivot position Y on a boom 10 of a bell crank 11 and a pivot position X on a connecting link 13 and a second line segment L2 connecting the pivot position Y on the boom 10 of the bell crank 11 and a pivot position W on a tilt cylinder 12 is set in a range from 0 degree to 180 degrees on the attachment 20, 30 side, the attachment can be selected from a plurality of types such as a bucket 20 and a fork 30 for use, and each of the attachment 20, 30 that is different from each other has a different pivot position on the connecting link 13 relative to the pivot position on the boom 10 as a reference point.

Description

technical field [0001] The invention relates to a working machine. Background technique [0002] Conventionally, it is known to use a wheel loader as a working machine. In the wheel loader, attachments such as buckets are set on the front end of the boom, which is pivotally supported on the vehicle body and set in such a way that the boom cylinder can move up and down, the bucket passes through The so-called Z bar linkage is driven. [0003] Such as Figure 35 As shown, the Z bar-shaped link is composed of a rocker 11 pivotally supported in the approximate center of the boom 10 in a rotatable manner, and a hydraulic cylinder ( Refer to the dashed line), and the connecting link 13 connecting the other end side of the rocker 11 and the back of the bucket 20 . [0004] In addition, in Figure 35 In , the illustration of the boom cylinder and the hydraulic cylinder for dumping is omitted in order to avoid the complexity of the drawing. In addition, in the drawing, the pivot ...

AI Technical Summary

Problems solved by technology

[0019] However, in the wheel loader disclosed in Patent Document 1, the angle characteristics of the bucket are improved by specifying the pivot positions of the vehicle body and the hydraulic cylinder for dumping. In this case, after turning the boom to raise the bucket, the angle of the attachment at the highest position deviates greatly on the positive side (the side opposite to the dumping side), resulting in a problem that the angle characteristic cannot be maintained

[0020] Such problems even in Figure 35 Among the conventional wheel loaders shown, such as Figure 36 The same would result as shown, and, in Figure 37 In the wheel loader shown in Patent Document 2, such as Figure 38 as shown also produces

In particular, in the wheel loader of Patent Document 2, ( Figure 37 , 38 ), unlike other wheel loaders, the hydraulic cylinder for dumping (refer to the dot-dash line) is pivotally supported by the boom 10, and since the positional relationship between the hydraulic cylinder for dumping and Therefore, no matter whether the bucket 20 is tilted on the ground or not, as the bucket 20 rises, the attachment angle also deviates greatly on the positive side as it is, and the soil, etc. handled by the bucket 20 increases with the orientation. position, while overflowing to the body side

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