JP2802001B2 - Front loader frame structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure of a front loader mounted on a tractor.

[0002]

2. Description of the Related Art In a case where a front loader is mounted on a tractor, a side frame for mounting a front loader having a cylindrical body is fixed to the left and right sides of the tractor body in order to reinforce the body of the tractor body from cracking. , Fix the reinforcement bracket to the cylinder of this side frame,
The reinforcing bracket and the rear part of the tractor vehicle body are detachably connected by a rear reinforcing frame to be integrated with the tractor vehicle body.

[0003] The fixing structure of the cylindrical body and the reinforcing bracket includes a structure in which a hole is formed in one flat plate and the reinforcing bracket is fitted and welded to the cylindrical body, and a structure in which two reinforcing brackets are provided. In some cases, the flat end of each flat plate is formed into a semicircular concave portion and engaged with the rear half of the cylindrical body portion to be welded.

[0004]

In the former prior art, since the reinforcing bracket is welded by fitting the entire periphery of the hole into the cylindrical body, the manufacturing cost is high and the manufacturing becomes difficult.
In the latter conventional technique, since two flat plates are required, the material cost and the manufacturing cost are increased, and it is difficult to attach / detach to / from the rear reinforcing frame, and it is difficult to secure strength against twisting in both. It has a structure.

According to the present invention, the reinforcing bracket is formed into a shape having a vertical plate portion and a horizontal plate portion, and the front end thereof is fixed in an arc shape from the front of the outer periphery of the cylindrical portion through the rear to the vicinity of the lowest portion. Accordingly, an object of the present invention is to provide a frame structure of a front loader that can secure sufficient strength against bending and twisting and can easily be attached to and detached from a rear reinforcing frame.

[0006]

A specific means for solving the problems in the present invention is to fix a front loader mounting side frame 3 having a cylindrical body 2 to the left and right sides of a tractor body 1, 3 is a frame structure of a front loader in which a reinforcing bracket 5 is fixedly attached to the cylindrical body portion 2 and the reinforcing bracket 5 and a rear portion of the tractor vehicle body 1 are detachably connected by a rear reinforcing frame 4. It has a vertical plate portion 6 and a horizontal plate portion 7 intersecting with the vertical plate portion, and its front end is fixed in an arc shape from the front of the top A of the outer periphery of the cylindrical body 2 to the vicinity of the lowest portion B through the rear. is there.

[0007]

The reinforcing bracket 5 has an L-shape having a vertical plate portion 6 and a horizontal plate portion 7 intersecting the vertical plate portion 6, and exhibits sufficient strength against bending and twisting. The front end of the reinforcing bracket 5 is fixed in an arc shape from the front of the top part A of the outer periphery of the cylindrical body part 2 to the vicinity of the lowest part B through the rear part and does not need to be fitted to the cylindrical body part 2 at the time of fixing. The welding may be performed by applying the welding from the outside, and a sufficient fixing length at the top A of the cylindrical body portion 2 is ensured to secure the strength of the tractor vehicle body 1 against cracks and the like.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4, reference numeral 1 denotes a tractor body, an engine 8, a clutch housing 9, and a transmission case 10.
Are directly connected in the front-rear direction, and a front axle frame 12 having a U-shape in a plan view projects forward from the engine 8.
A radiator, a battery, and the like are mounted on the front axle frame 12, and are surrounded by the bonnet 11 together with the engine 8.

A front loader 13 pivotally supports the boom 15 above the mast 14 via a horizontal shaft 42, pivots a bucket 16 at the tip of the boom 15, and a boom cylinder 17 and a bucket which move the boom 15 up and down. The mast 14 is attached to the side frame 3. Side frame 3
There are a pair of left and right sides of the tractor body 1, and each side frame 3 has a cylindrical body portion 2 projecting outward from a mounting plate 19,
A reinforcing bracket 5 is provided to protrude rearward from the cylindrical body portion 2.

As shown in FIGS. 2 and 3, the mounting plate 19 has a front portion fixed to the front axle frame 12 (or the engine 8 together therewith) via bolts 22. The mounting plate 19 is provided between the front axle frame 12 and the spacer 24.
And the front axle frame 1 with respect to the engine 8
2 does not interfere with the bolt 23 for mounting the same. The rear part of the mounting plate 19 is fixed to the side surface of the clutch housing 9 (or flywheel housing) via bolts 25. Thereby, the mounting plate 19 also serves to connect the engine 8 and the clutch housing 9.

A cylindrical body is formed by projecting a cylindrical body outwardly from the left and right mounting plates 19 to the left and right.
The lower portion of the mast 14 is fitted and welded to the outer end of the mast 14 to form an integral structure that cannot be separated. This is because the tractor is a dedicated front loader machine.
The mast receiving portion may be fixed to the cylindrical body portion 2, and the mast 14 may be detachably attached to the mast receiving portion. The upper part of the mast 14 and the front part of the front axle frame 12 are connected by a brace 26.

The reinforcing bracket 5 is formed of a member having an L-shaped cross section, and has a vertical plate portion 6 and a horizontal plate portion 7 intersecting the vertical plate portion. Is formed long forward, and the top A of the outer periphery of the cylindrical body portion 2 is formed.
It is fixed in an arc shape from the front through the rear part to the vicinity of the lowest part B. The front upper portion of the vertical plate portion 6 may be located on the top A of the outer periphery of the cylindrical body portion 2, but by extending the front portion, the upward force applied to the cylindrical body portion 2, that is, the tractor body 1 is cracked. More powerful support can be provided for such forces. The rear lower portion of the vertical plate portion 6 may be formed up to the lowest portion B of the outer periphery of the cylindrical body portion 2, but if the front upper portion is located before the top A of the cylindrical body portion 2, it is difficult to fit into the cylindrical body portion 2. The arc formed at the front end of the vertical plate portion 6 is substantially semicircular.

Reference numeral 29 denotes an arc-shaped upper plate, which reinforces the fixation between the vertical plate portion 6 and the cylindrical body portion 2. Reference numeral 30 denotes a flat lower plate.
The adhesion between the horizontal plate 7 and the cylindrical body 2 is reinforced. The rear reinforcing frame 4 has an L-shaped cross section in the front half and a strip-shaped member in the rear half, and the vertical plate portion 6 and the horizontal plate portion 7 of the reinforcing bracket 5.
And are removably connected via bolts 31. The bolt hole through which the bolt 31 of either the rear reinforcing frame 4 or the reinforcing bracket 5 penetrates is a long hole in the front-rear direction, and absorbs a manufacturing error.

The rear portion of the rear reinforcing frame 4 is bolted to a rear axle case 33 fixed to the transmission case 10, and a lower engaging portion 34 is formed at the rear end for engaging and supporting a lower portion of a backhoe mount. . A triangular plate 35 is fixed to the rear portion of the rear reinforcing frame 4 and the rear axle case 33. An upper engaging portion 36 for connecting the upper portion of the mounting table of the backhoe is provided at the upper rear portion. Post 3
A mounting portion 39 for detachably mounting the mounting portion 8 is formed.

The reinforcing bracket 5 may be formed of an H-shaped or T-shaped section, or the rear reinforcing frame 4 may be formed of a strip or L-shaped member.
The full length may be formed by a profile. FIGS. 5 and 6 show two examples of the reinforcement structure at the root of the boom 15. The boom 15 is formed by welding a bottom plate 40 to a U-shaped cross section, and a boss 41 is provided at a root portion thereof, and is connected to the mast 14 via a horizontal shaft 42 passing through the boss 41.

The vicinity of the boss 41 is liable to be broken because the force is applied intensively. Therefore, the reinforcing plates are welded to the outer surfaces of the left and right side walls at the root of the boom 15, but the cost is high and the appearance is not good. Therefore, as shown in FIG.
5 is fixed to the inner surfaces of the left and right side walls, the boss 41 and the bottom plate 40 at the same time.
As shown in FIG. 7, a flat reinforcing plate 43 that is simultaneously bonded to the inner surfaces of the left and right side walls of the boom 15 and the boss 41 is fixed. Thereby, the reinforcing plate 43 can reinforce the root part of the boom 15 without being seen from the outside, and can reduce the cost by reducing the reinforcing plate and the welding length by half.

FIG. 7 shows an example of a damping stopper. The mounting plate 45 on the back of the bucket 18 has the boom 1
5 through a pivot 46 to form a four-bar linkage between the mounting plate 45 and the boom 15.
Links 47 and 48 are connected, and the tip of the piston rod 18 </ b> A of the bucket cylinder 18 is connected via a pin 49 in the middle of the first link 47.

The bucket cylinder 18 includes a bucket 1
When the damper 8 is dumped to the maximum angle, an excessive impact is applied to the piston, which may cause a failure.
A stopper which abuts against the end face of the mounting plate 45 at the tip of 5;
Alternatively, a stopper or the like that comes into contact with the end surface of the first link 47 is provided on the tip side surface of the boom 15 so that the movement of the piston rod 18A is stopped before the piston rod 18A reaches the maximum extension state.

However, with the stopper as described above,
Because it is difficult to set it at the exact position,
It may be damaged by the bite of a stone, and the cost is high. In FIG. 7, a stopper 50 is provided on the upper surface of the distal end of the boom 15 so as to contact the distal end of the piston rod 18A, so that the boss 18B at the distal end of the piston rod 18A fitted to the pin 49 comes into line or surface contact. . The stopper 50 is easily welded, and the tip of the boom 15 can be reinforced by welding. However, the stopper 50 may be provided so as to be adjustable in the front-rear position with a bolt or the like.

[0020]

According to the present invention described in detail above, the front loader mounting side frame 3 having the cylindrical portion 2 is fixed to the left and right sides of the tractor vehicle body 1. A front loader frame structure in which a reinforcing bracket 5 is fixed and the reinforcing bracket 5 and a rear portion of the tractor body 1 are detachably connected by a rear reinforcing frame 4, wherein the reinforcing bracket 5 intersects with a vertical plate portion 6. And the front end thereof is fixed in an arc shape from the front of the top A of the outer periphery of the cylindrical body portion 2 to the vicinity of the lowest portion B through the rear portion, so that the reinforcing bracket 5 is bent and twisted. Tractor body 1
Can be prevented, and the attachment and detachment with the rear reinforcing frame 4 can be facilitated.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional side view of a main part.

FIG. 3 is an enlarged plan view of a main part.

FIG. 4 is an overall side view.

FIG. 5 is a partially cutaway perspective view showing a first example of a reinforcing structure of a root portion of a front loader.

FIG. 6 is a side view showing a second example of a reinforcing structure of a root portion of a front loader.

FIG. 7 is a side view showing an example of a damping stopper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor body 2 Cylindrical part 3 Side frame 4 Rear reinforcement frame 5 Reinforcement bracket 6 Vertical plate part 7 Horizontal plate part A Top part B Minimum part

Claims (1)

(57) [Claims] 1. A front loader mounting side frame (3) having a cylindrical body (2) is fixed to the left and right sides of a tractor vehicle body (1), and is attached to the cylindrical body (2) of the side frame (3). A frame structure of a front loader in which a reinforcing bracket (5) is fixedly attached, and the reinforcing bracket (5) and a rear portion of the tractor body (1) are detachably connected by a rear reinforcing frame (4). 5) has a vertical plate portion (6) and a horizontal plate portion (7) intersecting with the vertical plate portion, the front end of which passes through the rear portion from the front (A) of the outer periphery of the cylindrical body (2) to the lowest portion (5). B)
A frame structure for a front loader, which is fixed in an arc shape to the vicinity.