JPS62185927A - Link apparatus of backet loader - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a bucket loader, and more particularly to a linkage device for controlling pivoting of a bucket relative to a boom.

(Technical background) The agricultural bucket loader weighs approximately 906 kg (20 uO
It is often used for lifting and transporting large round bales of Chigusa or wheat straw. This operation is often performed using a gripping attachment, which requires a bucket cylinder to be fully tilted and roll back the bales.

Conventional loaders do not have sufficient power to roll back the bales. If large cylinders were used to provide the necessary power, cycle times would be unacceptably slow.

In addition to handling large bales, agricultural loaders must be flexible enough to perform various types of tasks. Therefore, when making design changes to improve workability for a particular task, it is necessary to consider many factors in addition to the length of the cycle time. For example, cycle time,
Bucket roll pack force, bucket speed, bucket angle, bucket horizontality, bucket position, stall-out position, loads on stopping members and other parts, external loads, mechanical interference, appearance, 3. and cost. Restrictions are added from these points of view. The loader bucket must be designed with these constraints in mind. The following examples illustrate some of the limitations imposed on the design of linkages in accordance with the present invention. However, it should be understood that the specific values used in the examples below are not absolute and may vary depending on the loader model.

A cycle time appropriate linkage must not significantly exceed the required rollback force or the cycle time will become unacceptably high. For this reason, it is a problem that cannot be solved by simply increasing the cylinder size.

Bucket Roll Pack Force Bucket roll pack force is 906 kg (200 lbs.
,000 lbs.) of bales. The bucket must also have sufficient roll-packing force to remove the material to be transported from the pile when it is on the ground, and sufficient roll-packing force to remove the material from the pile to the transport position.

Bucket Speed The rotational speed of the bucket should be high enough (approximately 80 to 100 degrees per minute) at the end of the bucket dump cycle to flake off any stray material that may be attached to the bucket. It has to be speed.

Bucket Angle The bucket must be damped at a minimum of 60 degrees at ground level to provide sufficient forward plating.
and must roll back at least 40 degrees at ground level relative to the semi-liquid material. The bucket must dump at 45 degrees at full height and roll back approximately 50 degrees in the transport position to prevent material from falling in front of the bucket.

The self-leveling bucket linkage must provide acceptable self-leveling when integrated with the self-leveling linkage. This means that when the level bucket or attachment is lifted from a ground position, it must not roll back more than 10 degrees or fall into the lower blade in a horizontal position. Well, when the attachment rolls back completely at ground level, it must not roll back another 5 degrees or fall forward at all as it is lifted. The third requirement is that the bucket, fully rolled back in the transport position, must not tip forward more than 5 degrees when lifted to its full height.

Bucket Location The bucket edge should be located as close to the front of the tractor as possible. This creates a tightly coupled combination of loader and tractor with improved maneuverability and reduces the load on the front axle. In many cases, the allowable front axle load is the limiting factor in setting the loader's breakout and lifting capabilities.

Stallout position Once the bucket is fully damped on the ground and the boom is raised, the bucket continues to dampen until it reaches a point where it cannot rotate any further due to mechanical interference with the boom. This position is called a stallout. It is important that this position be located as high as possible to minimize inconvenience to the operator during the loading operation.

When the linkage of the stop member and other members of the loading/unloading device reaches the end of its movement, it contacts the boom of the loader through the stop member of the linkage device.

Linkages should be designed so that cylinder forces do not create unacceptably high stresses in pins, links or boom members.
It is necessary to design it as such.

External Loading The linkage must not only provide acceptable bucket force levels, but also withstand external forces applied to the bucket. These loads occur when the forward or backward movement of the tractor/loader unit is resisted by material or obstructions that impinge on the bucket cutting edge.

If the linkage is not properly designed, it will result in unacceptably high hydraulic pressure build-up or high stress loads on the link members and pins.

Because of the dimensions required of mechanical interference members to transfer loads in a bucket loader device, there are physical constraints on the location of the pivot point/spear. If these constraints are exceeded, mechanical interference between various members will occur.

Appearance The appearance of the linkage needs to be acceptable and matched to the style of the combined tractor and loader unit.

Cost link devices need to be simple enough in construction so as not to exceed cost targets for the functionality provided. The location of the boom pivot determines the complexity and therefore cost of the loader boom design.

Experts concerned with these and other issues have found that the loader provides sufficient power to handle large bales and also has other operating characteristics that make it suitable for versatile agricultural use. We recognize the need to provide an improved linkage system for loader buckets.

DISCLOSURE OF THE INVENTION The present invention provides a linkage system for agricultural bucket lobes to enable large round bales to be handled on available loader roll bars. This linkage is a four-linkage system using a boom link S, an idler link that is proportionally larger than the bucket carrying link, and a bucket-to-cylinder link. This linkage is driven by a longer bucket cylinder that provides the power needed to handle large bales.

In a preferred embodiment, the length of the link, expressed as a ratio of boom to link, is dimensioned such that approximately: Boom link 1.00, bucket carrying link 1
．． 88, link from bucket to cylinder 2.72)
S and idler link 3,74° In addition, the idler link curves to avoid the pivot point of the bucket when the bucket is fully dumped, and the link from the bucket to the cylinder bends when the bucket is fully rolled back. curved to act as a stop member.

The lengths of the links can be varied to accommodate loaders of various sizes as long as the preferred ratio of lengths is maintained. A longer link will require a cylinder with a longer stroke but a smaller diameter, and a shorter link will require a cylinder with a shorter stroke but a larger diameter.

It is an object of the present invention to provide an improved loader bucket IJ link device.

Another object of the present invention is to provide a loader bucket linkage system that allows large bales to be dumped and rolled back without compromising other performance characteristics of the loader.

Yet another object of the present invention is to provide a loader bucket linkage that increases power where needed while minimizing cylinder size and cycle time.

Yet another object of the present invention is to provide a loader bucket IJ link device that is simple in structure and inexpensive to manufacture.

Yet another object of the present invention is to provide a roller bucket linkage that is convenient to operate and easy to maintain.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the accompanying drawings.

Figure 1 shows a tractor 2 equipped with an agricultural bucket loader 4.
shows. The loader 4 has a gripping attachment 6 for gripping a large round tank 8 of Chigusa or wheat straw. Loader 4 includes a forwardly extending boom 10 and hydraulic means or cylinders (not shown) for moving boom 10 between lowered and raised positions. Said boom 1
0 end carries a pivotally mounted bucket 14 and a hydraulic means or cylinder 16, which positions the bucket in the fully rolled back position shown in FIGS. 4 and 5 and in the fully rolled back position shown in FIG. Move between the fully damped positions shown in the figure.

As shown most clearly in Figures 3, 5 and 6,
A four-bar linkage 20 is attached to the boom lO and interconnects the boom lO, the bucket 14, and the means for moving the bucket or cylinder 16. The link device 20 includes a boom link 22) a bucket link 24, and a carrier link.

/26'jF3 and an idle link 28.

Boom link 22 is the distal portion of boom 10 and its length is defined by the distance between boom rear pivot pin 31 and boom forward pivot pin 33. Bucket link 24 is located above boom link 22 and its length is defined by the distance between rear pivot pin 35 and front pivot pin 37 mounted on cylinder 16. There are two carrier links 26 to which buckets 14 are attached, the length of which is defined by the distance between pins 33 and 37. An idler link 28 interconnects pins 31 and 33, the length of which is defined by the distance between said pins.

The illustrated linkage device 20 includes an idler link 28, a bucket link 24, and a carrier link 26.
The lengths are approximately 3.74 g, 2.72 g and 1.88 g as a ratio to the boom link 22, respectively. As long as the preferred length ratios are maintained, the linkage can be sized to accommodate larger or smaller loaders.

The use of the linkage 20 provides a loader 40 with sufficient power to dump and roll back large, round bales without compromising other important operating characteristics. Power is increased only where needed, minimizing cylinder size and cycle time.

Effects of the Invention As can be seen from the above description, the present invention achieves at least all of the above objects.

[Brief explanation of drawings]

1 is a side view of a tractor/loader utilizing a loader bucket linkage according to the present invention, illustrating the use of a gripping attachment to engage a large tank located at ground level; FIG. Figure 2 is a top view taken from line 2-2 in Figure 1, and Figure 3 is an enlarged partial side view of the loader bucket linkage when the bucket is in a horizontal position at ground level as shown in Figure 1. Figure 4 is similar to Figure 1 but shows the bucket fully rolled back to lift the bales; Figure 5 is similar to Figure 3;
Similar to Figure 4, but an enlarged partial side view showing the bucket linkage of the loader when the bucket is fully rolled back 40 degrees from the ground as shown in Figure 4, S and Figure 6 are similar to Figure 3. 5 is an enlarged partial side view similar to FIG. 5 but showing the bucket linkage of the loader when the bucket is fully damped at full boom height (45 degrees); FIG. In the figure, 2...Tractor 4...Bucket loader 6.
...Gripping attachment 8...Bale 10...Boom 12...Hydraulic cylinder 14...Bucket 16...Hydraulic cylinder 20...Link device 2
2...Boom link 24...Bucket link
26...Carrier link 28...Idler link

Claims (1)

Claims: 1) a forwardly extending boom, means for selectively moving the boom between a lowered position and a raised position, a bucket pivotally connected to the boom, and a means for fully rolling the bucket; a bucket loader including means for selectively moving the bucket between a backed position and a fully damped position; a boom link having a length defined by a distance between a rear pivot pin of the boom fixed to the boom and the preceding pivot pin; a bucket link located above said boom link, the length of which is determined by the spacing between a rear pivot pin fixed to said bucket link and a forward pivot pin attached to said means for moving said bucket; a defined bucket link; and a carrier link pivotally connected at an upper end to the forward pivot pin of the bucket link and at a lower end to a forward pivot pin of the boom, the carrier link supporting the bucket; a carrier link whose length is defined by the spacing between the forward pivot pin of the bucket link and the forward pivot pin of the boom; and at an upper end the rear pivot pin of the bucket link. an idler link pivotally connected to a rear pivot pin of the boom at a lower end, the idler link and the bucket link being proportionally larger than the carrier link and the boom link; Characteristic link device. 2) A linkage device according to claim 1, wherein the means for moving the bucket is a hydraulic cylinder. 3) The apparatus of claim 1, wherein the length of the idle link is about 3 times the length of the boom link.
．． 74 times, the length of the bucket link is about 2.72 times the length of the boom link, and the length of the carrier link is about 1.88 times the length of the boom link.
Link equipment that is double.