JP2571757Y2 - Drive structure of sirocco fan for radiator in backhoe - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive structure of a sirocco fan for a radiator in a backhoe.

[0002]

2. Description of the Related Art In recent years, environmental problems and the like have been attracting attention, and noise generated during construction work has become a problem in construction work sites. Therefore, a low noise type construction work machine is desired.

Under such circumstances, a fan for forcibly cooling a radiator attached to an engine is provided in a backhoe for excavation work or the like in order to reduce noise.
Some are relatively quiet sirocco fans.

[0004] Due to heat balance and space considerations, the upper part of the radiator is disposed so as to be inclined toward the engine, and the sirocco fan is positioned below the radiator with respect to the crankshaft direction of the engine. The sirocco fan is arranged in a state where the drive shaft directions are orthogonal to each other, and a drive source such as a hydraulic motor is separately provided to drive the sirocco fan.

[0005]

However, in the sirocco fan driving method as described above, a hydraulic motor or the like is provided as a dedicated driving source, resulting in a significant increase in cost. .

Therefore, even if a low-noise backhoe is developed, the spread of such a low-noise backhoe has been slow due to a significant increase in cost.

[0007] Therefore, there is a strong demand from users for a low-cost low-noise backhoe.

An object of the present invention is to provide a drive structure for a radiator sirocco fan in a backhoe that can solve the above-mentioned problems.

[0009]

According to the present invention, a radiator is attached to the engine with its upper part tilted, and a sirocco fan is attached to the radiator through a cooling duct in order to forcibly cool the radiator. At
The drive shaft of the sirocco fan and the crankshaft of the engine are interlocked, and the sirocco fan is housed in a fan case with openings on the engine side and upper side, and a radiator is communicated above the fan case via a cooling duct. The fan case, the cooling duct, and the radiator were connected integrally to the engine.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a radiator sirocco fan driving structure in a backhoe according to the present invention.

FIG. 1 is an overall side view of a backhoe having a sirocco fan for a radiator according to the present invention.
FIG. 4 is an explanatory view showing a state where the sirocco fan is provided.

As shown in FIG. 1, the backhoe A has a crawler 4 attached to the center of a crawler-type traveling device 1 via a swivel bearing 3, and a bonnet 6 is disposed on the swivel 4. ing.

A sirocco fan F for disposing the engine 2 and radiator 30 in the bonnet 6 and forcibly cooling the radiator 30 adjacent to the radiator 30 is provided.
And other equipment.

In the swivel 4, a cabin 19 is provided on the left side with respect to the traveling direction of the backhoe A, and a driver's seat 15 is provided in the cabin 19. A part 5 is provided.

Left and right lever stands 16 and 16 as side lever specifications are disposed on both sides of the driver's seat 15, and operation levers 18 and 18 are provided on the left and right lever stands 16 and 16.
And cut-off levers 24, 24 are provided.

A boom bracket mounting fulcrum 7 is protruded from the front of the swivel base 4, and the boom bracket 7 supports the boom 11 and the arm 10 for excavation work on the mounting fulcrum 7. Attach the bracket 8, attach the boom 9 to the bracket 8, and attach the arm 10 to the tip of the boom 9.
And the bucket 11 are connected so as to be able to move up and down and rotate freely, thereby forming an excavation work part a.

A boom cylinder 12, an arm cylinder 13, and a bucket cylinder for operating the excavating section a
14 are respectively connected to control valves (not shown) via hydraulic piping, and the operator operates the operation lever 1
By operating the buttons 8 and 18, the control valve opens and closes appropriately, and the excavating work part a can be moved arbitrarily.

In FIG. 1, reference numeral 17 denotes a step surface of the control unit 5, reference numeral 22 denotes a blade having an earth discharging operation and a stabilizer function, and reference numeral 23 denotes an operating cylinder for moving the blade 22 up and down.

The overall structure of the backhoe A in this embodiment is as described above. The gist of the present invention is that the drive shaft F1 of the sirocco fan F and the crankshaft of the engine 2 are provided.
2a, the sirocco fan F is housed in a fan case 32 having an opening on the engine 2 side and the upper side, and the radiator 30 is connected to the upper part of the fan case 32 through a cooling duct 34, and That is, the fan case 32, the cooling duct 34, and the radiator 30 are integrally connected to the engine 2.

That is, as shown in FIG. 2, behind the engine 2 fixed by the engine mount 2b, the sirocco fan F is connected to the drive shaft F1 of the engine F.
Fan case 32 so that it is in the same direction as the crankshaft 2a.
The drive shaft F1 of the fan F and the crankshaft 2a of the engine 2 are interlockingly connected via a coupling 31.

Then, the fan case 32 accommodating and disposing the sirocco fan F is fixed to the mounting plate 35, and
35 is supported by a mounting bracket 33 fixed to the side of the engine 2.

A radiator 30 is provided above the fan case 32 accommodating the sirocco fan F in a state where the radiator 30 is inclined toward the engine 2, and between the radiator 30 and the fan case 32. The cooling ducts 34 are integrally connected to the mounting plate 35 with a gap d therebetween.

Accordingly, the fan case 32, the cooling duct 34, and the radiator 30 also vibrate in the same manner in response to the vibration of the engine 2, and are disposed in the case 32 and attached to the crankshaft 2a of the engine 2. The drive shaft F1 of the connected sirocco fan F is not twisted due to the out-of-phase vibration and the like, so that the shaft is not damaged or other troubles are caused.

Also, the fan case 32 and the cooling duct 34, and the cooling duct 34 and the radiator 30
Since each does not significantly interfere with each other, the gap d
May have a minimum width.

As described above, since the drive shaft F1 of the sirocco fan F for forcibly cooling the radiator 30 and the crankshaft 2a of the engine 2 are linked to each other, a drive source dedicated to the sirocco fan F such as a hydraulic motor is separately provided. There is no need to provide them, and a significant cost reduction can be achieved.

Also, unlike a hydraulic motor or the like, the amount of rotation is always affected by the number of revolutions of the engine 2 without being affected by the oil temperature, and a stable air volume can be obtained.
Cooling efficiency increases.

Further, since the fan case 32, the cooling duct 34, and the radiator 30 are fixed to the mounting plate 35, and the mounting plate 35 is supported by the mounting bracket 33 fixed to the side surface of the engine 2, The vibration and the vibration of the sirocco fan F are synchronized, and the drive shaft F1 of the fan F is not twisted and the coaxial F1 is not damaged, and is formed between the fan case 32, the cooling duct 34, and the radiator 30. The gap d is only required to have a minimum width, and the whole can be laid out compactly.

Further, in this embodiment, as described above, the clearance is provided between the fan case 32 and the cooling duct 34, and between the cooling duct 34 and the radiator 30 so as not to interfere with each other due to the vibration of the engine 2. d is provided,
A cushioning material such as rubber can be provided in the gap d.

In FIG. 2, reference numerals 36 and 37 denote pulleys, and reference numeral 38 denotes a timing belt.

The backhoe A in this embodiment is
In order to reduce the noise, the hood 6 provided with the sound absorbing ribs 40 is provided. The bonnet structure will be described below.

That is, as shown in FIG. 3, a steel plate serving also as a rib of the bonnet 6 is disposed inside the bonnet 6, and a rock-like rock wool as a sound absorbing material 41 is adhered to form a sound absorbing rib 40. doing.

In this embodiment, rock-like rock wool is used as the sound absorbing material 41. However, the sound absorbing material 41 has a plate shape or
There are various types such as cotton, fiber, and the like, and any type can be used as long as the object can be achieved.

With the above configuration, the engine sound and the hydraulic pump sound generated from inside the bonnet 6
Other noise can be absorbed by the sound absorbing ribs 40 to reduce external noise.

In addition, since the sound absorbing ribs 40 also serve as ribs of the bonnet 6, chattering noise and the like of the bonnet 6 due to noise can be prevented, noise generated outside can be reduced as a whole, and rigidity of the bonnet 6 itself can be reduced. It also contributes to the up.

Next, the cut-off lever 24 of the backhoe A
Will be described.

As shown in FIGS. 1, 4 and 5, operating levers 18, 18 are erected on left and right lever stands 16, 16 provided on both sides of the driver's seat 15, and the same operation is performed. lever
The cut-off levers 24, 24 provided on the outside of the 18, 18 are once extended to the excavation work section a side,
It is arranged so as to extend inward from 24a, 24a, respectively.

That is, the grip of the cut-off levers 24, 24
From the operator sitting on the driver's seat 15, the position of 24a, 24a should be closer to the excavation work part a and to the operator side than the left and right operation levers 18, 18, respectively. become.

Therefore, when operating the cutoff levers 24, 24, there is no danger that the arm may accidentally hit the operating levers 18, 18 and cause the digging work part a to malfunction.

When the operator gets on and off the cabin 19, as shown in FIG.
From the position X in the operating state of 24, the levers 24, 24 must be pulled to a position Y in which the levers 24, 24 are pulled forward. At this position Y, the hydraulic pressure to the excavation work unit a is shut off, so that the excavation work unit a There is no risk of operation and it is very safe.

The cut-off levers 24, 24 are
They are linked and have a structure in which one of them can be operated.

[0041]

According to the present invention, the following effects are produced.

Since the drive shaft of the sirocco fan for forcibly cooling the radiator and the crankshaft of the engine are connected to each other, there is no need to provide a separate drive source for the sirocco fan, such as a hydraulic motor, and the cost is greatly reduced. Can be achieved.

Also, unlike a hydraulic motor or the like, the amount of rotation can always be obtained in accordance with the engine speed without being affected by the oil temperature, and a stable air volume can be obtained, thereby increasing the cooling efficiency. Moreover, since the sirocco fan is housed in the fan case having an opening on the engine side, the hot air around the engine can be effectively discharged to the outside, and the ambient temperature around the engine can be reduced.

A sirocco fan, a cooling duct,
In addition, since the radiator is integrally connected to the engine side, the fan case, cooling duct, and radiator also vibrate in the same way with respect to the engine vibration, and the drive shaft of the sirocco fan The shaft is not damaged by twisting or the like, and it does not cause other troubles.

Further, the fan case and the cooling duct, and the cooling duct and the radiator do not greatly interfere with each other due to the vibration of the engine, so that the above-mentioned gap may be a minimum width, and the whole can be laid out compactly. .

[Brief description of the drawings]

FIG. 1 is an overall side view of a backhoe including a sirocco fan for a radiator according to the present invention.

FIG. 2 is an explanatory diagram showing a state where the sirocco fan is provided.

FIG. 3 is a perspective view showing a bonnet structure.

FIG. 4 is a front view showing a mounting structure of a cut-off lever.

FIG. 5 is a side view of the same.

[Explanation of symbols]

 A Backhoe F Sirocco fan F1 Drive shaft 2 Engine 2a Crankshaft 30 Radiator 34 Cooling duct

Claims (1)

(57) [Scope of request for utility model registration] A radiator (30) is attached to the engine (2) with its upper part tilted to the engine (2) side, and the radiator (30) is connected to the radiator (30) via a cooling duct (34) in order to forcibly cool the radiator (30). in backhoe mounted sirocco fan (F), the drive shaft of the sirocco fan (F) and (F1), with interlocked coupling the crankshaft of the engine (2) (2a) Te, the Shirokkofu
Fan (F) with a fan having openings on the engine (2) side and upper side.
The fan case (32).
The radiator (30) is communicatively connected via the cooling duct (34), and
Kamo, fan case (32), cooling duct (34) and radiator
A drive structure for a sirocco fan for a radiator in a backhoe, wherein (30) and (30) are integrally connected to the engine (2) .