JP2023169583A - Radiator for work machine, and work machine for slopes - Google Patents

Abstract

To provide a radiator for a work machine whereby: even when a work machine is operated on steep slopes, it is possible to effectively prevent the radiator mounted on the work machine from overheating, and also provide a work machine for slopes.SOLUTION: A radiator for a work machine includes: a radiator body 3 having an upper tank 2 at its top; a pair of water injection pipes 5, 5 that extend upwards from both left and right ends of the upper tank 2; a confluence part 6 where the pair of water injection pipes 5, 5 meet; a coolant supplier 7 at the top of the confluence part 6; a radiator cap 8 that closes the top opening of the coolant supplier 7 in an openable manner; and a radiator subtank 11 that is connected to the coolant supplier 7 through an overflow hose 9.SELECTED DRAWING: Figure 1

Description

The present invention relates to a radiator for a working machine that is suitably used in sloped areas such as mountainous areas, and to a working machine for sloped areas.

Conventionally, a coolant inlet for injecting coolant for engine cooling is provided at the upper end of a radiator, and a radiator sub-tank (reserve) is connected to this coolant inlet through a tank hose to store the coolant. tank) is connected. A pressure cap that removably closes the coolant inlet in a sealed state is attached to the coolant inlet, and engine coolant is injected with the pressure cap removed (for example, , see Patent Document 1).

Japanese Patent Application Publication No. 2017-115819

When a vehicle equipped with the radiator disclosed in Patent Document 1, such as a working machine such as an excavator or a hole-drilling machine such as a shovel car, is operated on a steep slope as shown in FIG. When the liquid level of the coolant reaches the installation part of the coolant supply part located at the upper end of the radiator, for example, the center of the upper surface of the radiator upper tank, the overflow hose (tank hose) connected to the coolant supply part is removed. Coolant may leak into the radiator subtank (reserve tank) through the In this case, the cooling fluid contained in the radiator becomes insufficient, and the cooling function of the radiator deteriorates, causing the engine of the working machine to overheat.

An object of the present invention is to provide a radiator for a working machine that can effectively prevent the engine of the working machine from overheating even when the working machine is operated on a steep slope; An object of the present invention is to provide a working machine for sloped land equipped with a radiator for the machine.

The present invention includes the following inventions.

(1) A radiator body with an upper tank installed at the top, a pair of water injection pipes extending upward from both left and right ends of the upper tank, a confluence where the pair of water injection pipes join, and an upper part of the confluence. A radiator cap that opens and closes an upper end opening of the coolant supply section, and a radiator sub-tank connected to the coolant supply section via an overflow hose. Radiator for work equipment.

(2) As described in (1), the water injection pipe has a lower part extending upward from the upper surface of the upper tank, and an inclined part extending from the upper end of the lower part toward the merging part. radiators for work machines.

(3) The radiator for a working machine according to (1) or (2), wherein the merging section is disposed on a center line passing through a central portion in the width direction of the radiator main body.

(4) The radiator for a working machine according to any one of (1) to (3), wherein the working machine is used on a slope.

(5) A work machine for sloped land equipped with a radiator having a radiator body with an upper tank provided thereon, a pair of water injection pipes extending upward from both left and right ends of the upper tank, and a pair of water injection pipes extending upward from both left and right ends of the upper tank, A confluence section where the water pipes meet, a coolant supply section provided above the confluence section, a cap that opens and closes the upper end opening of the coolant supply section, and an overflow hose connected to the coolant supply section. A work machine for sloped terrain that is equipped with a radiator sub-tank that is connected through the radiator sub-tank.

According to the radiator for work equipment described in (1), if the radiator is tilted significantly, even if the liquid level of the coolant reaches halfway down one of the water injection pipes, it will not reach the upper part of the upper tank. The coolant does not reach the installed part of the coolant supply section, and is prevented from flowing into the radiator reserve tank via an overflow hose or the like connected to the coolant supply section. Therefore, there is an advantage that overheating of the engine due to insufficient amount of coolant contained in the radiator for the working machine can be effectively prevented.

According to the radiator for work equipment described in (2), the extension length of the water injection pipe is larger than that of a radiator in which the water injection pipe extends in a straight line from the top surface of the upper tank at a predetermined angle. This has the advantage that even if the radiator is tilted significantly, the level of the coolant can be more effectively prevented from reaching the installation part of the coolant supply section.

According to the radiator for work equipment described in (3), the confluence section and the coolant supply section provided above the confluence section are disposed at positions biased toward one side in the width direction of the radiator main body. , when the radiator is tilted toward the installation part of the confluence part, the liquid level of the coolant does not easily reach the installation part of the coolant supply part, and the liquid level is not easily reached through the overflow hose connected to the coolant supply part. The outflow of coolant can be suppressed.

(4) Even when a work machine equipped with the above-mentioned work machine radiator is operated on a steep slope, the outflow of the coolant through the overflow hose connected to the coolant supply section is suppressed. This has the advantage of effectively preventing engine overheating.

According to the working machine for sloped land described in (5), even when this working machine is operated on a steep slope, the coolant can reach the installation part of the coolant supply part located above the upper tank. Therefore, the outflow of the coolant through the overflow hose connected to the coolant supply section can be suppressed, and overheating of the engine can be effectively prevented.

FIG. 1 is a front view showing an embodiment of a radiator for a work machine according to the present invention. FIG. 2 is an explanatory diagram showing the operating state of a working machine equipped with a radiator. FIG. 2 is a front view showing a state in which a radiator for a work machine is tilted. It is a front view showing a modification of the radiator for a work machine according to the present invention. FIG. 2 is a front view showing a conventional example of a radiator for a work machine according to the present invention.

Hereinafter, embodiments according to the present invention will be described based on the drawings. It should be noted that structures given the same reference numerals in each figure indicate the same structure, and the explanation thereof will be omitted.

FIG. 1 is a front view schematically showing the configuration of a radiator 1 for a working machine according to an embodiment of the present invention. This radiator 1 for a work machine has a radiator main body 3 with an upper tank 2 provided at the top, and a lower tank 4 provided at the bottom of the radiator main body 3. The coolant returned to the upper tank 2 of the radiator 1 from the engine (not shown) mounted on the working machine 10 such as a hole drilling machine as shown in FIG. 2 forms the radiator body 3. It is configured to be cooled by outside air when moving to the lower tank 4 side through a water tube.

Further, the radiator 1 for a work machine includes a pair of water injection pipes 5, 5 extending upward from both left and right ends of the upper tank 2, and a confluence part 6 where the water injection pipes 5, 5 join together above the upper tank 2. A coolant supply section 7 provided at the upper part of the confluence section 6, a radiator cap 8 that opens and closes the upper end opening of the coolant supply section 7, and an overflow hose 9 connected to the coolant supply section 7. A radiator sub-tank 11 is connected to the radiator sub-tank 11.

The water injection pipe 5 has a lower part 51 extending upward from the upper surface of the upper tank 2, and an inclined part 52 extending upward from the upper end of the lower part 51 toward the merging part 6 while being inclined. . Further, the pair of water injection pipes 5, 5 are formed symmetrically, and the merging portion 6 is arranged on a center line 30 passing through the widthwise center of the radiator main body 3.

The coolant supply part 7 is made of a cylindrical body whose lower end is connected to the upper surface of the confluence part 6, and the peripheral wall of the radiator cap 8 is screwed onto the upper part of the cylindrical body, so that the upper end opening of the coolant supply part 7 is opened. The part can be opened and closed. Further, a hose attachment portion 91 is provided protruding from the circumferential surface of the coolant supply portion 7 , and one end portion of the overflow hose 9 is fitted into the hose attachment portion 91 .

The other end of the overflow hose 9 is fixed to a hose fastening portion 92 provided on the radiator sub-tank 11 by being fitted onto the outside or the like. In FIG. 1, reference numeral 12 is a drain hose that drains excess cooling water supplied into the radiator sub-tank 11 to a location such as below an undercover (not shown). Further, reference numeral 13 is a hose attachment part to which one end of the drain hose 12 is fitted, etc., and reference numeral 14 is a closing cap that opens and closes the upper end opening of the radiator sub-tank 11. be.

When filling the radiator 1 for a work machine with coolant, after removing the radiator cap 8 from the coolant supply section 7, insert the inlet of a coolant replenishment container (not shown) into the coolant supply section 7. By tilting the coolant replenishment container while pressed against the upper end opening of the coolant replenishment container, the coolant contained in the coolant replenishment container is gradually injected into the coolant supply section 7. The coolant injected into the coolant supply section 7 is sequentially supplied into the upper tank 2, the radiator body 3, and the lower tank 4 through the water injection pipes 5, 5, and is stored therein.

After storing a sufficient amount of coolant in the upper tank 2, radiator body 3, and lower tank 4, and removing air from the radiator 1 for the working machine as necessary, the radiator cap 8 is supplied with coolant. By screwing into the portion 7, the upper end opening of the coolant supply portion 7 is closed. In the above-described configuration, when the temperature of the engine rises during operation of the working machine 10, the thermostat (not shown) opens the valve, and the cooling water is supplied according to the water supply power of the water pump (not shown) driven by the engine. The engine is cooled by being supplied to the engine of the working machine 10 through the upper tank 2, the radiator body 3, and the lower tank 4.

When the temperature of the cooling water rises to near the boiling point during engine operation and the cooling water expands, the internal pressures of the upper tank 2, radiator body 3, and lower tank 4 rise above a certain value. Cooling water passes through the left and right water injection pipes 5, 5 and reaches the upper confluence section 6 and the coolant supply section 7. As a result, a portion of the cooling water in the radiator 1 flows out from the overflow hose 9 into the radiator sub-tank 11 and is stored therein. After that, when the engine cools down and the internal pressure of the upper tank 2, radiator body 3, and lower tank 4 decreases, negative pressure is generated that sucks the cooling water in the radiator sub-tank 11, causing the upper tank 2, radiator body 3, and lower tank Coolant is drawn back to 4.

When the working machine 10 is operated on a steep slope as shown in FIG. 2, the working machine radiator 1 mounted on the working machine 10 is tilted significantly as shown in FIG. Even in such a case, the coolant contained in the radiator 1 will not flow out from the coolant supply section 7 arranged above the upper tank 2 to the radiator sub-tank 11 side via the overflow hose 9. Therefore, there is an advantage that it is possible to effectively prevent the occurrence of a problem caused by a decrease in the cooling function of the radiator, that is, the overheating of the engine of the working machine as in the conventional example.

That is, in the conventional radiator, as shown in FIG. 23, and there is a possibility that the coolant may flow out toward the radiator sub-tank via the overflow hose 24 connected to the coolant supply section 23. When such a situation occurs, the amount of coolant contained in the radiator 21 becomes insufficient, and the cooling function of the radiator is reduced, which inevitably causes the engine of the working machine to overheat.

On the other hand, in the radiator 1 for a working machine according to the present invention, as shown in FIG. As shown in FIG. 3, when the radiator 1 for the working machine is tilted significantly, the liquid level W of the coolant is not on one side. Even if the water reaches the middle of the water injection pipe 5, unless the slope is such that the work equipment 10 for sloped land falls over, the coolant supply part 7 located above the upper tank 2 will not reach the installation part.

Therefore, according to the radiator 1 for a work machine according to the present invention and the work machine 10 for slope use on which the radiator 1 is mounted, the radiator sub-tank 11 is connected to the overflow hose 9 connected to the coolant supply section 7. The coolant is prevented from flowing out toward the engine, and overheating of the engine caused by an insufficient amount of coolant contained in the radiator 1 can be effectively suppressed. Furthermore, the water injection pipes 5, 5 and the confluence section 6 can function as a storage section that accommodates a portion of the cooling water expanded during engine operation. Therefore, an air pocket (air retention part) can be formed by adjusting the internal pressure of the radiator body 3 without providing a conventionally well-known pressure regulator valve or vacuum valve to adjust the communication state between the radiator body and the radiator sub-tank. It also has the advantage of being able to prevent this from happening. In addition, in FIG. 2, an example in which the present invention is applied to the working machine 10 consisting of a drilling machine that performs drilling work on sloped land etc. is explained, but the present invention is not limited to this, and it can be applied to an excavating machine consisting of a shovel car or a crushing machine consisting of a crusher. Of course, the present invention can also be applied to machines etc.

Further, instead of the above-described embodiment, a water injection pipe 5a may be provided that extends in a straight line upward from the top surface of the upper tank 2 at a predetermined angle, as in a modified example 1a shown in FIG. . However, as in the embodiment shown in FIG. 3, the water injection pipe 5 has a lower part 51 extending upward from the upper surface of the upper tank 2, and an inclined part 52 extending from the upper end thereof toward the upper merging part 6. According to this configuration, it is possible to increase the extension length of the water injection pipe 5 compared to the modification example 1a shown in FIG. This has the advantage that it is possible to more effectively prevent the occurrence of a situation in which the liquid level W reaches the installation part of the coolant supply part 7.

Note that instead of the above-described embodiment in which the merging portion 6 of the water injection pipe 5 is arranged on the center line 30 passing through the central portion of the radiator body 3 in the width direction, the merging portion 6 and the coolant supply provided above the radiator body 3 are arranged. It is also possible to arrange the portion 7 at a position biased to one side in the width direction of the radiator main body 3 (not shown). However, when the merging section 6 and the coolant supply section 7 are arranged at positions biased toward one side in the width direction of the radiator main body 3, the radiator 1 for the work machine is inclined toward the disposed section of the merging section 6. When this happens, the liquid level W of the coolant easily reaches the installation part of the coolant supply section 7, and the coolant tends to flow out into the radiator sub-tank 11 via the overflow hose 9 connected to the coolant supply section 7. Tend. For this reason, as shown in the above-described embodiment, it is preferable that the merging portion 6 of the water injection pipe 5 be disposed on the center line 30 passing through the widthwise central portion of the radiator main body 3.

1, 1a Radiator for work equipment 2 Upper tank 3 Radiator body 4 Lower tank 5, 5a Water injection pipe 6 Confluence section 7 Coolant supply part 8 Radiator cap 9 Overflow hose 10 Work equipment for sloped terrain 11 Radiator sub tank 12 Drain hose 13 Drain hose 14 Closing cap 30 Center line 51 Lower part of water injection part 52 Inclined part of water injection part 91, 92 Fastening part of overflow pipe

Claims (5)

A radiator body with an upper tank installed at the top,
a pair of water injection pipes extending upward from both left and right ends of the upper tank;
A confluence part where the pair of water injection pipes meet;
a cooling liquid supply section provided above the merging section;
a radiator cap that opens and closes an upper end opening of the coolant supply section;
A radiator for a working machine, comprising: a radiator sub-tank connected to the coolant supply section via an overflow hose. The water injection pipe includes a lower portion extending upward from the upper surface of the upper tank;
The radiator for a working machine according to claim 1, further comprising an inclined portion extending from an upper end portion of the lower portion toward the merging portion. 3. The radiator for a working machine according to claim 2, wherein the merging section is disposed on a center line passing through a central portion in the width direction of the radiator main body. The radiator for a working machine according to claim 1, wherein the working machine is used on a slope. A work machine for sloped land equipped with a radiator having a radiator body with an upper tank provided on the top,
a pair of water injection pipes extending upward from both left and right ends of the upper tank;
A confluence part where the pair of water injection pipes meet;
a cooling liquid supply section provided above the merging section;
a cap that opens and closes an upper end opening of the coolant supply unit;
A radiator sub-tank connected to the coolant supply section via an overflow hose.

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