JPS6218497Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a front loader, and is used for loading and transportation work for agriculture and civil engineering construction.

(Prior technology) Front loaders, which load and transport compost, grass, earth, etc., have vertical frames attached to the left and right sides of the tractor body.
A supporting frame body is formed by projecting a side frame (brace) forward from the vertical frame and attaching the protruding end of the side frame to the front side of the tractor body, and has a working tool such as a bucket or fork in the front part. A pair of left and right lift arms (booms) are pivoted so that they can move up and down, and are equipped with telescopic hydraulic cylinders that allow the lift arms to move up and down. This enables loading and transporting work, and is proposed in, for example, Japanese Patent Laid-Open No. 52-45104.

(Problem that the invention aims to solve) By the way, although conventional front loaders require a fairly large oil capacity, they do not use a tank for the hydraulic system for lifting and lowering the work equipment (also used for ), leading to capacity shortages.

In addition, even if an oil tank is installed to eliminate the lack of capacity, there are considerable restrictions on its mounting location. For example, if it is installed between the rear wheel fenders, the piping will be long and the resistance will not only increase. Another problem was that the oil could not be cooled.

Furthermore, since a large force is applied to the support frame when performing loader work, it is advantageous to increase the length of the support frame in the longitudinal direction of the tractor body and attach it to the tractor body with a so-called large span. , this point has not been considered in the conventional example.

The main object of the present invention is to attach the support frame of the front loader to the tractor body over a large span, and to enable the oil tank to be cooled by suction air for cooling the engine.

(Means for Solving the Problems) The present invention has a front axle frame 15 extending in the longitudinal direction on the left and right sides of the fuselage 8, and this front axle frame 1
A cooler 13 having a suction fan 10 for cooling the engine is mounted on the engine 5 and is covered with a bonnet 14, and is protruded forward and downward from a pair of left and right vertical frames 19 and each of the vertical frames 19. Side frame 21
The following technical measures are taken in a front loader in which a support frame 18 having a support frame 18 is attached to the machine body 8, and a lift arm 30 having a work tool 31 at the front part is attached to the support frame 18 so as to be able to rise and fall freely. Thus, the aforementioned objective was achieved.

That is, in the present invention, each of the front axle frames 15 is made to protrude forward from the front end surface of the bonnet 14, and the oil tank 20 is mounted and fixed upright on the protrusion, and the tank 20 is attached to the suction fan 10. The front ends of the pair of left and right side frames 21 are overlapped with the left and right side surfaces of the tank 20 in a side view, and at the overlapping position It is characterized by being attached to the front axle frame 15 side.

(Example) The figure shows a case where the present invention is applied to an agricultural tractor, where 1 is the vehicle of the agricultural tractor, 2 is the front wheel,
Reference numeral 3 denotes a rear wheel, an engine 4 is mounted on the front part of the vehicle 1, and a clutch housing 6 and a transmission case 7 are sequentially connected to the rear surface of a crank case 5 below the engine to form a fuselage 8.

A radiator 9 is provided in front of the engine 4 so as to face forward, and a suction fan 1 is provided between the engine 4 and the radiator 9 to blow air from the front to the rear of the vehicle 1.
0 is inserted, and the fan 10 is rotationally driven via a transmission belt 11 and a pulley 12 by the rotational force of the crankshaft of the engine 4. The radiator 9 and suction fan 10 constitute a cooler 13 for cooling the engine 4, and a condenser may be used instead of the radiator 9.

A bonnet 14 is provided to enclose the engine 4 and cooler 13.

Reference numeral 15 denotes a pair of left and right front axle frames, which are arranged horizontally and parallel to each other in the direction of movement of the vehicle 1, and whose rear ends are detachably attached to both sides of the lower part of the crankcase 5 using fasteners 16 such as a plurality of bolts, nuts, etc. Each front end is connected to the front end of the vehicle 1 by a horizontal bumper 17 that protrudes from the front end of the vehicle 1.

That is, the cooler 13 is provided on a pair of left and right front axle frames 15, and the front axle frame 1
5 protrudes forward from the front surface 14A of the bonnet 14, and the protruding ends of this protruding portion 15A are connected by a bumper 17.

An oil tank 20 is arranged and erected on the protrusion 15A of the front axle frame 15.
has a hollow flat box shape, and is provided with a plurality of cylinders 26 connecting the front wall 24 and the rear wall 25 of this tank 20, through which the cooling air sucked by the suction fan 10 can flow. It has a hole 27 extending through it in the front-rear direction.

18 is a support frame body, and a pair of left and right vertical frames 19
and a side frame 21 protruding forward and downward from the upper end in the height direction of the vertical frame 19.
Reference numeral 9 denotes a base 22 fixed to the clutch housing 6.
The side frame body 21 is erected and fixed with bolts 23.
are superimposed on both left and right sides of the oil tank 20 in side view, and are attached to the front axle frame 15 side at the superimposed position.

In this embodiment, as shown in FIG. 2, the side frame 21 is superimposed on the upper side of the oil tank 20 and fixed by welding, bolts, etc., and is attached to the protrusion 15A of the front axle frame 15 via the oil tank 20. It is being

Note that the front end of the side frame 21 may overlap the side surface of the oil tank 20 and be fastened and fixed to the protrusion 15A with bolts or the like.

The loader 28 has a pair of left and right lift arms 30 and a working tool 31 operated by a tilt cylinder 32 at the front end of the arms 30, and the base end of the lift arm 30 protrudes to the upper end of the vertical frame 19. It is pivotally mounted to the bracket 29 so as to be vertically movable about a horizontal axis, and a telescoping hydraulic cylinder 33 is connected between each lift arm 30 and the vertical frame 19, and the lift arm 30 is raised and lowered by the telescoping action of the cylinder 33. I try to do that.

34 is a pump, the suction side of which is connected to the piping member 3.
5 is connected to the oil tank 20, and its discharge side is connected to a control valve mechanism 36 attached to the rear surface of the upper end of the vertical frame body 19 through a piping member (not shown).

Note that the return of the control valve mechanism 36 is via the piping member 37,
The oil tank 2 is connected to the oil tank 2 through the passage 21A in the side frame 21.
0.

That is, the passage 21A is formed in the oil tank 2 by forming the passage 21B on the side of the tank at a position where the side frame 21 overlaps the side of the tank.
It communicates with the internal housing section of 0.

Although not shown, the tank 20 has a replenishment port, and the passage 21A may be a piping member provided separately from the side frame 21.

In the above embodiment, when the tractor 1 is moved backward and the control valve mechanism 36 is operated, the lifting hydraulic cylinder 33 is expanded and contracted, and the lift arm 3
0 is raised and lowered, and the tilt cylinder 32 is expanded and contracted to rotate the working tool 31, and loader work is performed here.

In this loader work, the cylinders 32, 33
The hydraulic fluid is applied to the front protrusion 1 of the front axle frame 15.
The oil is stored in an oil tank 20 installed upright on the bonnet 5A, and since the tank 20 is placed forward of the bonnet front 14A and can be placed all the way across the vehicle width, a sufficient storage capacity can be secured. Become.

Further, even if the oil tank 20 is placed upright on the bonnet front surface 14A, since the oil tank 20 has the through hole 27 penetrating in the front-rear direction, the intake (intake) of cooling air by the suction fan 10 is ensured. Moreover, the oil in the tank 20 is cooled by passing the cooling air through the through hole 27, thereby providing an oil cooler function.

Furthermore, the load during loader work is borne by the fuselage 8 via the support frame 18, and for this purpose, the span between the attachment point of the intermediate portion of the support frame 18 to the fuselage 8 side and the attachment point to the front end side must be widened. It is advantageous to make it large.

Regarding this point, in the embodiment of the present invention, the front axle frame 15 is provided with a protrusion 15A that protrudes forward from the bonnet front surface 14A, and a side frame (brace) is provided.
By overlapping the front end of the oil tank 21 with the side surface of the oil tank 20 erected on the protrusion 15A and attaching it at this overlapping position, the span can be increased and the load during loader operation can be reliably withstood. become.

(Effect of idea) The present invention is as described above, and has the following advantages.

Each of the front axle frames 15 is attached to the bonnet 1.
protrude forward from the front end surface of 4, and on the protrusion,
Since the oil tank 20 is mounted vertically and fixed,
It is possible to provide a tank 20 with a large capacity, and it is also easy to replenish the tank 20.

In addition, since the tank 20 has a through hole 27 extending in the front and back direction through which the cooling air from the suction fan 10 can be conducted, even if it is installed upright in front of the bonnet, there is no problem in taking in the engine cooling air. On the other hand, by conducting cooling air through the through holes 27, it is possible to provide an oil cooler function, which is advantageous.

Furthermore, the front ends of the pair of left and right side frames 21 protruding forward and downward from the left and right vertical frames 19 of the support frame 18 are superimposed on the left and right side surfaces of the tank 20 in side view, and the superimposed position is Since it is attached to the front axle frame 15 side, the support frame 18 of the loader 28 can have a large longitudinal span, is highly durable, and can perform stable operations.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; Fig. 1 is an overall side view when the present invention is applied to an agricultural tractor;
The figure shows a perspective view of the main part of FIG. DESCRIPTION OF SYMBOLS 1...Vehicle, 4...Engine, 10...Suction fan, 13...Cooler, 15...Front axle frame, 15A...Protrusion part, 18...Support frame body, 19
... Vertical frame body, 20 ... Oil tank, 21 ... Side frame body, 28 ... Loader.

Claims (1)

[Claims for Utility Model Registration] A cooler 1 having a front axle frame 15 extending in the longitudinal direction on the left and right sides of a fuselage 8, and having a suction fan 10 for engine cooling on the front axle frame 15.
3 is mounted and covered with a bonnet 14, and has a pair of left and right vertical frames 19 and side frames 21 projecting forward and downward from each of the vertical frames 19. 8, and the support frame 1
8, a lift arm 3 having a working tool 31 in the front part;
In a front loader equipped with a bonnet 1 that can be raised and lowered, each of the front axle frames 15 is attached to a bonnet 1.
protrude forward from the front end surface of 4, and on the protrusion,
While mounting and fixing the oil tank 20 upright,
The tank 20 has a through hole 27 passing through it in the front and rear direction through which the cooling air generated by the suction fan 10 can be conducted.
The front ends of the pair of left and right side frames 21 are stacked on the left and right side surfaces of the tank 20 in side view,
A front loader characterized in that the front loader is attached to the front axle frame 15 side at the overlapping position.