KR20010087301A - Mounting structure for radiator and oil-cooler of construction machine - Google Patents

Abstract

PURPOSE: To provide a structure for attaching the radiator and the oil cooler of a construction machine such that the tuning needed for avoiding overcooling and insufficient cooling can be achieved in a short time without changing the cooling capabilities of the radiator and the oil cooler. CONSTITUTION: In the structure for attaching the radiator and the oil cooler of the construction machine, the radiator and the oil cooler are disposed in front of a cooling fan to cool radiator cooling water and hydraulic fluid at the same time. The radiator 43 and the oil cooler 44 are arranged in such a way that the gap between one side of the radiator and one side of the oil cooler which are opposite to the exterior part 5 of a vehicle body is wider than the gap between the other sides of the radiator and the oil cooler. The gap between the other sides is closed and the wider gap is positioned near an intake port 7 provided in the exterior part 5 of the vehicle body. Opening adjusting plates 48, 58 and 68 for providing opening 48a, 59, and 69 with predetermined apertures may be provided in the wider gap.

Description

INSTALLATION OF RADIATOR AND OIL COOLER FOR CONSTRUCTION MACHINES {MOUNTING STRUCTURE FOR RADIATOR AND OIL-COOLER OF CONSTRUCTION MACHINE}

The present invention relates to a mounting structure of a radiator and an oil cooler of a construction machine.

In construction machinery, the radiator water temperature and the hydraulic oil temperature should be below the allowable maximum temperature even when continuous operation is performed at the maximum outside air temperature (hereinafter referred to as the maximum outside air temperature) as the specification value and the maximum outside air temperature at the specification. It prevents overheating. For this reason, generally, the radiator cooling water and the operating oil of an oil cooler are cooled simultaneously by the cooling wind by a cooling fan.

For this reason, a lot of proposals have conventionally been made regarding the installation structure of a radiator and an oil cooler, for example, it is disclosed by Unexamined-Japanese-Patent No. 7-14122. Fig. 6 is a sectional side view of a main portion of a hydraulic excavator to which the mounting structure of the radiator and the oil cooler disclosed in the publication is applied. In addition, an arrow shows the flow of a cooling wind, and it does the same after that.

In FIG. 6, the engine 25 is mounted in the vehicle body front-rear direction in the rear part of the upper revolving structure 20, and the cooling fan 26 and the radiator (in order) in front of the engine 25 (namely, the vehicle rear side) are shown in order. 27) The oil cooler 28 is provided. The oil cooler 28 is inclined upward with respect to the radiator 27, and is installed. Moreover, between the radiator 27 and the oil cooler 28, the cover plate 29 which surrounds the outer perimeter of the space part between both is attached. The upper cover 22 which covers the upper part of the radiator 27 and the oil cooler 28 is provided with the intake port 23 of a cooling wind.

According to this structure, since the oil cooler 28 was installed inclined rearward with respect to the radiator 27, the outside air from the suction port 23 is shown by the arrow in the figure, and the oil cooler 28 and the radiator ( 27, it flows smoothly at right angles to each surface, and the cooling efficiency can be improved by preventing the fall of the air volume due to the blockage of cooling wind, or partial dispersion of cooling. Furthermore, since the entire outer circumference between the oil cooler 28 and the radiator 27 is surrounded by the cover plate 29, all the cooling winds sucked from the cooling fan 26 are both the oil cooler 28 and the radiator ( 27, the oil cooler 28 and the radiator 27 can be reliably cooled.

However, in the installation structure of the radiator 27 and the oil cooler 28 as described in the Japanese Unexamined Patent Publication No. 7-14122, the following two problems exist.

(1) Construction which eliminated the lack of each cooling by adjusting the cooling efficiency of the radiator 27 and the oil cooler 28, making the consumption horsepower of the cooling fan 26 the minimum required, and thereby reducing fuel consumption. It is desired to be able to develop a machine in a short period of time. However, in the technique described in Japanese Unexamined Patent Publication No. 7-14122, the above realization is quite difficult.

(2) The optimization of the cooling efficiency and the horsepower of the above (1) results in different types of radiator 27 and oil cooler 28 for each type of construction machine, which increases the number of types and the manufacturing cost and parts management cost. It is increasing.

The details of the above (1) and (2) will be described below.

(1) When the construction equipment is continuously operated at or below the specification maximum outside air temperature (assuming 40 ° C, and the same applies below), the radiator water temperature and the operating oil temperature are the same as the allowable maximum temperature (the same 100 ° C for simplicity of explanation). In order to ensure that the cooling capacity of the radiator, the cooling capacity of the oil cooler, and the size and rotation speed of the cooling fan are precisely set during the development stage, the test operation is usually performed. As a result, for example, when the continuous operation is performed at the specification maximum outside air temperature of 40 ° C, the radiator water temperature may be 98 ° C and the hydraulic oil temperature may be 90 ° C. In this case, the radiator water temperature and the hydraulic oil temperature have a margin for the allowable maximum temperature of 100 ° C, but since this is being cooled more than necessary by using a cooling fan, the number of rotations of the cooling fan so that the water temperature of the radiator becomes 100 ° C. Lowers the power consumption of the cooling fan by lowering it. At this time, the hydraulic oil temperature rises proportionally to about 92 ° C, but is still cooling with a margin of about 8 ° C. Therefore, the cooling fan consumes extra horsepower and lowers fuel economy.

The above problem also occurs in the installation structure as described in Japanese Unexamined Patent Publication No. 7-14122. That is, in development, the test operation is performed after determining the cooling capacity of the radiator 27 and the oil cooler 28 in the design stage. Here, since the radiator 27 and the oil cooler 28 always have the same flow of cooling air through the cover plate 29, as described above, the efficiency and actual efficiency of both cooling capacities are achieved. It can happen that the rate of rise of the radiator water temperature and the operating oil temperature in the equipment is inconsistent. Therefore, in one test run, when the hydraulic excavator is continuously operated at the maximum ambient temperature, it is quite difficult to achieve a balanced result at the same time the radiator water temperature and the hydraulic oil temperature at the maximum allowable temperature.

For that reason, test and repeat the test. Tuning is necessary to eliminate the lack of cooling of the radiator 27 and the oil cooler 28. For example, first, the pitch (interval) of the cooling fins (not shown) of the oil cooler 28 is coarsened to reduce the total heat dissipation area of the cooling fins, thereby lowering the cooling capacity of the oil cooler 28 to reduce the operating oil. The temperature is allowed to cool only to 96 ° C., for example. As a result, the temperature rise of the cooling wind passing through the oil cooler 28 is suppressed, and the cooling air amount is increased by lowering the ventilation resistance due to the coarsening of the cooling fin hitch, thereby cooling the radiator 27. Improve the capacity so that the radiator water temperature drops to 96 ° C equal to the fluid temperature. Next, the rotation speed of the cooling fan 26 is gradually lowered until the radiator water temperature and the hydraulic oil temperature of 96 ° C become approximately 100 ° C of the maximum allowable temperature at the same time.

By the above tuning, the cooling efficiency of the cooling fan 26 can be raised and the power consumption can be set to the minimum required amount. However, since the tuning method design changes either one of the oil cooler 28 and the radiator 2 to make the hydraulic oil temperature and the radiator water temperature the same, it is necessary to repeat the test operation and the test, and the development period and the development cost increase. do.

(2) In the construction machine, if the optimum oil cooler or radiator is designed for each individual model as described above, there are many kinds and the quantity of production per one type decreases, resulting in a decrease in production efficiency and an increase in cost. Brings about. Therefore, although a cost reduction is made by using a common oil cooler or a radiator among similar models, this commonization makes it difficult to optimize the cooling efficiency and consumption horsepower of the cooling fan for each model described in (1) above, resulting in low cost. But fuel economy is bad.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an installation structure of a radiator and an oil cooler of a construction machine that can be tuned in a short period of time without altering the cooling capacity of the radiator and the oil cooler and to eliminate excessive shortage of cooling. Doing.

In order to achieve the above object, the present invention, the radiator of the construction machine to install a cooling fan in front of the engine covered with the vehicle body, and to install a radiator and an oil cooler in front of the cooling fan to cool the radiator coolant and the operating oil at the same time; In the installation structure of the oil cooler, the gap between the radiator and the oil cooler is arranged with the gap between one side opposite to the exterior of the vehicle body wider than the gap between the other sides, and the wider gap in the vicinity of the intake port provided on the exterior of the vehicle body. The configuration is placed.

According to this configuration, the cooling wind by the cooling fan is provided with the clearance between the one side positioned near this intake port between the radiator and the oil cooler from the intake port of the exterior of the vehicle body, in addition to the normal cooling air flowing into the radiator via the oil cooler. Bypass cooling air flowing directly into the radiator can be obtained. Therefore, first, by changing the amount of bypass cooling wind, the difference between the radiator water temperature and the hydraulic oil temperature can be changed to be approximately equal to the difference between the allowable maximum temperatures of both. The amount of bypass cooling wind can be changed by, for example, changing the angle between the radiator and the oil cooler or arbitrarily adjusting the opening amount of the intake port. Next, by changing the rotation speed of the cooling wind, the radiator water temperature and the hydraulic oil temperature can be changed in substantially parallel movement.

Therefore, without altering the cooling capacity of the radiator and the oil cooler, the radiator water temperature and the operating oil temperature when the construction machine is continuously operated at or below the specification maximum outside temperature are approximately matched to the maximum allowable temperatures of each, so as to eliminate the lack of cooling. Since it can be tuned, the horsepower of the cooling fan can be minimized. As a result, fuel economy and cooling fan noise can be reduced.

In addition, since the cooling can be performed without changing the cooling capability of the radiator and the oil cooler, it is possible to tune the radiator and the oil cooler so that the test operation and the test of the radiator and the oil cooler are not necessary. In addition to the reduction, the cost can be reduced by commonizing the radiator and the oil cooler.

Moreover, since the wide gap is located near the exterior of the vehicle body, it is easy to insert a nozzle or the like into the gap between the radiator and the oil cooler, and the middle is easily visible from the outside, so that the radiator can be cleaned easily.

In addition to the above configuration, the present invention may have a configuration in which an opening adjustment plate for installing an opening having a predetermined opening amount is attached to a wider gap between the radiator and the oil cooler.

According to this configuration, by attaching the opening adjustment plate to the gap, the amount of opening of the opening in the gap can be adjusted to adjust the amount of the bypass cooling wind. Here, the adjustment of the opening amount of the opening in the gap may be, for example, by changing the width of the opening adjustment plate made of a flat plate to adjust the area blocking the gap, or changing the size and / or number of holes provided in the opening adjustment plate, Alternatively, this opening of the opening adjustment plate holding the opening of the predetermined opening amount can be blocked by an opening / closing cover (described in detail in the embodiment) or the like to change the area. Therefore, in addition to the above effects, the tuning can be performed more easily.

In addition, if the opening amount can be arbitrarily adjusted by the operator by the opening adjustment plate, it is possible to change the efficiency of the cooling capacity of the radiator and the cooling capacity of the oil cooler, so that the heat generation amount of the engine and the operating oil can be increased without increasing the horsepower of the cooling fan. The cooling efficiency of the radiator water temperature and the hydraulic oil temperature can be appropriately set in accordance with various work contents in which the ratio of the heat generation amount is different (e.g., the cooling efficiency of the hydraulic oil temperature is increased, for example, at high load excavation or at long distance driving). Therefore, the versatility in the application work can be improved.

In addition, in the present invention, in addition to the above configuration, a net may be attached to a wider gap between the radiator and the oil cooler.

According to this configuration, since the amount of the bypass cooling wind can be set by the roughness of the eye of the net, tuning as described above can be facilitated by adjusting the roughness of the eye of the net, and thus the same effect as described above. The effect can be obtained. In addition, the net prevents the inflow of foreign substances such as wood debris and prevents clogging of the radiator.

1 is a plan view of a hydraulic excavator to which the present invention is applied.

2 is a partial cross-sectional rear view of the hydraulic excavator.

3 shows a perspective view of a mounting structure of the radiator and the oil cooler of the first embodiment.

4 shows a perspective view of a mounting structure of the radiator and the oil cooler of the second embodiment.

Fig. 5 shows a perspective view of a mounting structure of the radiator and the oil cooler of the third embodiment.

Fig. 6 shows a main portion partial cross-sectional side view of the prior art.

(Explanation of symbols on the main parts of drawing

One … Lower traveling body 2. Upper Swivel,

3…. Counterweight 4... engine

5…. Body exterior 6. Side intake

7. Top intake port 12. Working machine

41…. Cooling fan 42. Shroud

43. Radiator 44... Oil cooler

45,46... Shroud 47. Bottom plate

48. Aperture adjustment plate 48a. Opening

49. Net 51... Opening and closing cover

52... Long 53. Butterfly nuts

54. Mark 55... Screw member

58. Opening adjustment plate 59. hole

61. Hydraulic pumps 62, 63. Hydraulic motor

68. Opening adjustment plate 69. Opening

EMBODIMENT OF THE INVENTION Below, embodiment is described with reference to FIGS. 1-5.

1 and 2, a description will be given of a hydraulic excavator to which the mounting structure of the radiator and the oil cooler according to the present invention is applied. Fig. 1 is a plan view of the hydraulic excavator, and Fig. 2 is a partial partial rear view.

A counter weight 3 is provided at an upper rear end of the upper swing body 2 rotatably mounted in the upper approximately center of the lower traveling body 1, and an engine 4 and cooling in front of the counter weight 3. The fan 41 or the like is provided in the horizontal direction toward the cooling fan 41 side toward the vehicle body left side. In addition, a vehicle body exterior 5 is provided to surround the engine 4, and the vehicle body exterior 5 is provided with an intake port and an exhaust port of cooling wind, and a side intake port 6 is provided on the left side of the vehicle body left end portion. The upper surface intake port 7 is provided, the side surface exhaust port 8 is provided on the right side, and the upper surface exhaust port 9 is provided at the right side of the vehicle body. In addition, the cooling fan 41 is provided in front of the engine 4, and the protection plate 42 is provided surrounding the outer periphery of the cooling fan 41. Moreover, the radiator 43 is provided in front of the protection plate 42. The oil cooler 44 is provided at the front of the radiator 43. The hydraulic pump 61 is provided at the rear of the engine 4, and the oil cooler 44 is a hydraulic pump. 61) is connected to the hydraulic circuit of the hydraulic oil discharged (circuit not shown)

In addition, the work machine 12 (only part of which is shown) is attached so that up-and-down swinging is possible in the substantially center of the upper turning body 2, and the work machine 12 is driven by the hydraulic cylinder which is not shown in figure. In addition, the hydraulic motors 62 and 63 for running are provided in the rear part of the lower traveling body 1. These hydraulic cylinders for working machines, hydraulic motors 62 and 63 for traveling, and the like are driven by the discharge pressure oil from the hydraulic pump 61.

Next, the installation structure of the radiator and oil cooler which concerns on 1st Embodiment is demonstrated based on FIG. 3 is a perspective view of a mounting structure of the radiator and the oil cooler of the present embodiment.

In the figure, the left and right side plates 45 and 46 connect the left and right ends of the radiator 43 and the oil cooler 44 so that the gap between both upper sides is wider than the gap between both bottom sides. The gap between both sides is sealed. In addition, the gap between both bottom edges is sealed by the bottom plate 47, and the bottom plate 47 makes all or part thereof detachable (not shown). The bottom plate 47 is configured to be detachable by inserting a member made of urethane rubber into the gap, but may be made of, for example, an iron plate or the like. An opening adjustment plate 48 holding an opening 48a of a predetermined area is detachably attached between both upper sides, and a net 49 is attached to the opening 48a. In the vicinity of the opening part 48a of the upper surface of the opening adjustment plate 48, the opening and closing cover 51 which can adjust the opening amount of the opening part 48a is attached and provided. In this embodiment, a pair of long holes 52 and 52 are provided in the left and right ends of the opening and closing cover 51, and the pair of left and right screw members 55 and 55 provided in the vicinity of the opening 48a are described above. It is inserted into the pair of long holes 52 and 52 so as to be fastened with the butterfly nuts 53 and 53. These opening amount adjusting means makes it possible to fix the opening / closing cover 51 at any position between the entire opening 48a, the entire closure, or both. Moreover, the mark 54 corresponding to expansion | disconnection, half opening, or total closure is provided in the upper surface of the opening-closing cover 51. As shown in FIG.

Next, the operation and effect of the first embodiment will be described with reference to FIGS. 1 and 2.

(1) First, as shown in FIG. 3, the radiator 43 and the oil cooler 44 are arranged so that the clearance between the side edges is wider than the clearance between both bottom edges, and the clearance between both sides and the bottom edges. Are respectively sealed, and the opening adjustment plate 48 which holds the opening part 48a of a predetermined area is provided in the clearance gap between both upper sides. 2, the opening adjustment plate 48 is located in the vicinity of the upper surface suction mechanism 7 of the vehicle body exterior 5. As shown in FIG. As a result, the cooling wind by the cooling fan 41 is indicated by arrow P in addition to the normal cooling wind flowing into the radiator 43 via the oil cooler 44 as shown in the image table G of FIG. Similarly, the bypass cooling wind flowing directly into the radiator 43 from the opening 48a of the opening adjustment plate 48 can be obtained.

Therefore, the following tuning becomes possible. First, by adjusting the opening amount of the opening 48 of the opening adjustment plate 48 to change the amount of the bypass cooling air, the difference between the amount of cooling air to the radiator 43 and the amount of cooling air to the oil cooler 44 is changed. The difference between the radiator water temperature and the oil temperature is approximately equal to the difference between the maximum allowable temperatures of both. In addition, the adjustment method of the opening amount of the opening part 48a is mentioned later. Next, the rotation speed of the cooling fan 41 is changed, and the radiator water temperature and the hydraulic oil temperature are changed substantially parallelly.

Thereby, the construction machine is specified by adjusting the opening area of the opening portion 48a and the rotation speed of the cooling fan 41 without changing the cooling capacity of the radiator 43 and the oil cooler 44. In the case of continuous operation in the figure, it is possible to tune the radiator water temperature and the hydraulic oil temperature to the respective maximum allowable temperatures so as to eliminate excessive shortage of cooling, so that the horsepower of the cooling fan 41 can be minimized. Therefore, it is possible to reduce fuel consumption and to reduce noise of cooling fan rotation.

Moreover, since the tuning for eliminating both of the cooling capacities of the radiator 43 and the oil cooler 44 can be performed without changing the cooling capacity of the radiator 43 and the oil cooler 44, the test operation of the radiator 43 and the oil cooler 44 at the development stage is performed. This eliminates the need for repetition, and shortens the development period and reduces development costs. In addition, since the same tuning can be performed by using similar radiators 43 and oil coolers 44 in common, the cost of production and management by commonizing the radiators 43 and oil coolers 44 with other models. Reduction is possible. As a result, both low cost and low fuel consumption can be achieved.

(2) Since the opening amount adjustment of the opening part 48a of the opening adjustment plate 48 is performed as follows, this tuning can be made easy.

(a) The roughness of the eyes of the net 49 attached to the opening portion 48a is adjusted.

(b) Slide the opening and closing cover 51 to adjust the area blocked by the opening 48a.

(3) Since the net 49 is attached to the opening part 48a, the foreign material such as the dregs of water contained in the bypass cooling wind can be prevented and the clogging of the radiator 43 can be prevented. In addition, since the opening adjustment plate 48 and the bottom plate 47 are detachable, the opening adjustment plate 48 and the bottom plate 47 are removed at the time of cleaning the clogging of the radiator 43 and the oil cooler 44. By removing, the air nozzle etc. are inserted comfortably in the clearance gap between the radiator 43 and the oil cooler 44 from upper direction, and cleaning operation is possible. In addition, since foreign matters removed at the time of cleaning are easily discharged to the outside from the lower gap after removing the bottom plate 47, the cleaning operation can be facilitated.

(4) In FIG. 3, the opening and closing cover 51 is attached to the upper surface of the opening adjustment plate 48, and the opening and closing cover 51 is provided with a long hole 52, a screw member 55 and a butterfly nut 53 ( The aperture amount adjusting means makes it possible to fix the aperture 48a at any position to expand, open or close the aperture 48a, so that the operator can conveniently adjust the aperture amount of the aperture 48a set by the tuning. For example, the opening amount set by tuning is obtained so that it may be acquired at the position of "S" of the mark 54 of the opening-closing cover 51, and you may reduce conveniently. This reduces the amount of bypass cooling wind indicated by arrow P in the cooling wind of the cooling fan 41 in FIG. 2, and instead flows to the radiator 43 via the oil cooler 44 indicated by arrow G instead. It is possible to increase the amount of normal cooling wind that enters. As a result, since the air warmed by the oil cooler 44 flows more into the radiator 43, the cooling capacity of the radiator 43 can be reduced conveniently. Instead, the cooling capacity of the oil cooler 44 is increased. By such a configuration, it is possible to cope with the following situations.

Here, the above tuning is performed with respect to the state of continuous excavation work with the most frequent use of the hydraulic excavator. In the state of continuous excavation work, since the excavation of the ground and the work machine are lifted, each operation with the swing of the upper swing structure which has large inertia is performed successively, so that the load ratio of the engine 4 is large and heat transfer is performed. The amount of heat generated is not maximum because the hydraulic fluid repeatedly reciprocates the hydraulic cylinder for the work machine and the hydraulic motor for the turning.

(a) When a hydraulic excavator accidentally meets hard ground during continuous excavation work, it is advantageous to continue working on the hydraulic excavator in use, as compared to the replacement time and cost of the larger hydraulic excavator. . In addition, even in hard parts, a large hydraulic excavator may not enter even in hard ground.

In the excavation of the hard ground, the engine 4 is applied at the time of excavation because it takes time to excavate and becomes less frequent with the swing of the upper swing structure 2 lifted by the work machine 12. Because of the high load at the moment, the load factor is low, and the heat generation amount of the engine 4 is not large. In addition, since the frequency of the up / down movement of the work machine 12 and the turning of the upper swinging body 2 is small, the piece and the hydraulic oil have a low flow rate of the hydraulic oil, which is a relief when the joule heat (heat generated from the viscous resistance of the hydraulic oil) is released. Heat is generated. As is well known, since the relief heat (the accumulated amount of pressure and flow rate) of the hydraulic heat is changed to heat, the amount of heat generated is instantaneously high. Therefore, if the frequency of the relief is large, the calorific value of the operating oil will be higher than that in the usual continuous excavation work, and the operating oil will tend to become high temperature.

When this situation occurs under the environment of the high outside air temperature in the summer, the butterfly nut 53 of the opening / closing cover 51 is fixed to the position of “H” of the mart 54 to close the opening 48a. In this state, the cooling capacity of the oil cooler can be slightly increased to cope.

(b) In the hydraulic excavator, moving from the work site far from the base station to the next site, depending on the preparation of the transport truck and personnel at the base station and the size of the transportation cost to the work site, etc. Even if the hydraulic excavator is a foil type (the lower traveling body 1 holds a wheel: not shown), the crawler belt type hydraulic excavator shown in FIG. 1 may move independently. In this long period of time, since the engine 4 is a load as much as it resists the running resistance, the amount of heat generated is low, while the hydraulic oil drives the high speed hydraulic motors 62 and 63 of the lower traveling body oil at high speed. Since the long piping path (not shown) is continually and largely circulated between the hydraulic motors 62 and 63 and the hydraulic pump 61 installed at the rear part on the upper swinging body 2, the joule heat is continuously generated and the amount of heat generated is increased. many.

When this situation occurs during the summer outside air temperature, the opening and closing cover 51 is fixed at the position of "T" of the mark 54 with the butterfly nut 53, and the opening portion 48a is fully closed. In this way, the cooling capacity of the oil cooler 44 can be further increased to cope with it.

As described above, under normal continuous excavation operation state with the highest frequency of use, the opening and closing cover 51 of the opening adjustment plate 48 is developed, and tuning is performed to eliminate the lack of cooling to consume the cooling fan 41. After the horsepower is set to the minimum necessary, it is possible to cope with the opening amount adjustment of the opening portion 48a even in the heat generation situation of the engine 4 and the hydraulic oil in a different working state from that. As a result, it is possible to simultaneously achieve low cost, low fuel consumption and high versatility.

Next, the second embodiment will be described with reference to FIG. 4. 4 is a perspective view of a mounting structure of the radiator and the oil cooler of the present embodiment. In addition, the same code | symbol is attached | subjected to the component same as FIG. 3, and the following description is abbreviate | omitted and it is similarly carried out below.

The opening adjustment plate 58 is detachably attached between the upper side of the radiator 43 and the oil cooler 44. The opening adjustment plate 58 is provided with holes 59 of a predetermined size drilled by a predetermined number.

Next, the operation and effect of the second embodiment will be described with reference to FIGS. 2 and 4.

As shown in FIG. 4, the opening adjustment board 58 which holds the predetermined number of holes 59 of predetermined size is provided in the clearance gap between the radiator 43 and the oil cooler 44 at both upper sides. And as shown in FIG. 2, the opening adjustment plate 58 is located in the vicinity of the upper surface inlet port 7 of the vehicle body exterior 5. As shown in FIG. Thereby, in addition to the normal cooling wind flowing into the radiator 43 via the oil cooler 44 as indicated by arrow G, directly from the hole 59 of the opening adjustment plate 58 as indicated by arrow P. Bypass cooling air flowing into the radiator 43 can be obtained.

Therefore, the tuning of the radiator water temperature and the hydraulic oil temperature can be facilitated. That is, first, the size and / or number of the holes 59 of the opening adjustment plate 58 are adjusted to change the difference between the amount of cooling air to the radiator 43 and the amount of cooling air to the oil cooler 44 in the same manner as in the above embodiment. Change the difference between the water temperature and the fluid temperature. Next, the rotation speed of the cooling fan 41 is changed, and the radiator water temperature and the hydraulic oil temperature are changed in substantially parallel movement. Thereby, the same effects as the effect (1) in the above embodiment (reduction of fuel consumption and noise, reduction of development period and development cost, and cost reduction of production and management) can be obtained.

In addition, since the opening adjustment plate 58 can be manufactured only by making a hole in a flat plate, adjustment of the total opening area of the hole 59 can be made easy by changing the size and / or number of the hole 59, Tuning is made easier.

As a result, low cost and low fuel consumption can be made compatible.

In addition, since the opening adjustment plate 58 and the bottom plate 47 are made detachable, the cleaning operation | work of clogging of the radiator 3 and the oil cooler 44 can be made easy like the previous embodiment.

Next, 3rd Embodiment is described with reference to FIG. 5 is a perspective view of a mounting structure of the radiator and the oil cooler of the present embodiment.

In the same figure, the side plates 65 and 65 are attached to the left and right side surfaces of the radiator 43, and the side plates 66 and 66 are attached to the left and right side surfaces of the oil cooler 44. As shown in FIG. The side plate 65 and the side plate 66 are rotatably connected by the pin 61 at the bottom. Further, an upper portion of the side plate 65 is provided with a U-shaped locking portion 62 which is formed long in the rotational direction of the side plate 65 and holds a U-shaped hole in which the rotational direction front end is opened, and the side plate 66 is provided. On the upper side of the screw member 63 protruding outward is fixed. The side plate 65 is rotatable while contacting along the outer surface of the side plate 66 in a state where the screw member 63 is inserted into the U-shaped hole of the U-shaped locking portion 62. It is fastened to the side plate 66 by a nut (not shown) which is screwed to the screw member 63 in the rotational position. In addition, the side plates 65 and 65 and the side plates 66 and 66 seal the gap between the radiators 43 and both sides of the oil cooler 44. In addition, the opening adjustment plate 68 is detachably attached to the clearance gap between the radiator 43 and both upper sides of the oil cooler 44. And the opening amount of the opening part 69 which remain | survives in a clearance gap is adjusted by changing the width W of this opening adjustment board 68, and closing the said clearance gap and adjusting an area.

Next, the operation and effect of the present embodiment will be described with reference to FIGS. 2 and 5.

Effects similar to the effect (1) in the above embodiment (reduction of fuel economy and noise, reduction in development period and development cost, and cost reduction in production and management) can be obtained.

In addition, since the opening adjustment plate 58 can be manufactured only by drilling a hole in the flat plate, the adjustment of the total opening area of the hole 59 can be easily changed in the size and / or number of the holes 59. It can be done easily.

As a result, low cost and low fuel consumption can be made compatible.

In addition, since the opening adjustment plate 58 and the bottom plate 47 are detachable. As in the previous embodiment, cleaning of clogging of the radiator 43 and the oil cooler 44 can be facilitated.

Next, the third embodiment will be described with reference to FIG. 5. 5 is a perspective view of a mounting structure of the radiator and the oil cooler of the present embodiment.

In the same figure, the side plates 65 and 65 are attached to the left and right side surfaces of the radiator 43, and the side plates 66 and 66 are attached to the left and right side surfaces of the oil cooler 44. As shown in FIG. The side plate 65 and the side plate 66 are rotatably connected by the pin 61 at the bottom. In addition, a U-shaped locking portion 62 is formed in the upper portion of the side plate 65 that is elongated in the rotational direction of the side plate 65 and holds a U-shaped hole in which the rotational direction front end is opened. A screw member 63 protruding outward is fixed to the upper side of the 66. The side plate 65 is rotatable while contacting along the outer surface of the side plate 66 in a state where the screw member 63 is inserted into the U-shaped hole of the U-shaped locking portion 62. The side plate 66 is fastened by a nut (not shown) that is screwed to the screw member 63 at the rotational position of the screw member 63. The side plates 65 and 65 and the side plates 66 and 66 seal the gaps between the radiator 43 and the oil cooler 44 on both sides. In addition, the opening adjustment plate 68 is detachably attached to the clearance gap between the radiator 43 and both upper sides of the oil cooler 44. The opening amount of the opening 69 remaining in the gap is adjusted by changing the width W of the opening adjustment plate 68 to close the gap to adjust the area.

Next, the operation and effect of the present embodiment will be described with reference to FIGS. 2 and 5.

As shown in FIG. 5, the width W of the opening adjustment plate 68 which closes the clearance gap between the radiator 43 and the oil cooler 44 at both sides is adjusted to form an opening 69 having a predetermined area remaining in the clearance gap. Alternatively, the angle between the radiator 43 and the oil cooler 44 is adjusted by the rotation between the side plates 65 and 60 to adjust the opening amount of the opening 69. 2, the opening adjustment plate 68 is located in the vicinity of the upper surface inlet port 7 of the vehicle body exterior 5. As shown in FIG. Thereby, in addition to the normal cooling wind flowing into the radiator 43 via the oil cooler 44 as indicated by arrow G, as shown by arrow P, the radiator 43 is directly connected to the radiator 43. Incoming bypass cooling wind can be obtained.

Therefore, the tuning of the radiator water temperature and the hydraulic oil temperature can be facilitated. That is, by first adjusting the width W of the opening adjustment plate 68 and / or the angle between the radiator 43 and the oil cooler 44, the difference between the radiator water temperature and the hydraulic oil temperature is changed as in the previous embodiment, and then By changing the rotation speed of the cooling fan 41, the radiator water temperature and the hydraulic oil temperature are changed substantially in parallel. By this, the same effect as the effect (1) in the first embodiment (reduction of fuel economy and noise, Shorter development period, lower development costs, and lower production and management costs).

In addition, since the opening adjustment plate 68 can be manufactured on a flat plate, adjustment of the opening area of the opening 69 can be easily performed by changing the width W of the opening adjustment plate 68. In addition, the rotation between the radiator 43 and the oil cooler 44 can easily adjust the angle formed by both. By this, the above tuning can be further facilitated. In addition, as a method of changing the width W of the opening adjustment plate 68, a plurality of narrow opening adjustment plates may be mounted in parallel in advance and selectively removed from the plurality of opening adjustment plates.

As a result, low cost and low fuel consumption can be made compatible.

In addition, since the opening adjustment plate 68 and the bottom plate 47 are detachable, the clogging of the radiator 43 and the oil cooler 44 can be facilitated like the previous embodiment.

In addition, in the above embodiments, the configuration in which the wider gap between the radiator and the oil cooler are provided so as to face the upper surface of the exterior of the vehicle body has been described. However, the present invention is not limited to this configuration, for example, The configuration in which the gap is provided to face the side of the vehicle exterior is also applicable.

In addition. The combination of the component described in the said embodiment is not limited to this, The combination may be arbitrary within the range which can achieve the technical idea of this invention.

Since the present invention can achieve remarkable effects as described above, the present invention can be applied not only to the hydraulic excavator but also to other construction machines having a radiator and an oil cooler, and has low cost, low fuel consumption and high versatility. It is possible to provide an installation structure of an engine and an oil cooler of a construction machine which simultaneously realizes this.

(1) Radiator and oil cooler in front of the cooling fan to make the gap between the two sides wider than the gap between the other sides, and the opening adjustment plate is installed in the wide one side of the gap to install an opening of a predetermined size, and also the gap between the other sides. It sealed and cooled engine cooling water and hydraulic fluid simultaneously, and the said opening adjustment plate was arrange | positioned near the intake port of the exterior of a vehicle body. As a result, the cooling wind by the cooling fan obtains the normal cooling wind flowing into the radiator via the oil cooler and the bypass cooling wind flowing directly into the radiator from the inlet of the vehicle body through the opening by the opening adjustment plate. Can be.

At this time, by first adjusting the opening amount according to the opening adjustment plate to change the amount of the bypass cooling wind, the difference between the radiator water temperature and the hydraulic oil temperature can be changed to be approximately equal to the difference between the allowable maximum temperatures. Next, by changing the rotational speed of the cooling fan, the radiator water temperature and the hydraulic oil temperature can be changed substantially in parallel.

Thus, the radiator is operated when the construction machine is continuously operated at the maximum outside air temperature by adjusting the opening amount and adjusting the cooling fan rotation speed without changing the cooling capacity of the radiator and the oil cooler (ie, without changing the type). Since the water temperature and the hydraulic oil temperature are approximately matched to their respective allowable maximum temperatures, and can be tuned so that there is no shortage of cooling, the horsepower of the fan can be set to the minimum required. Therefore, fuel economy and noise can be reduced.

(2) Tuning can be performed without changing the cooling capacity of the radiator and oil cooler, which eliminates the need for repeating test operations in the development stage, shortens the development period and reduces development costs, as well as the radiator and oil cooler. It is also possible to reduce the cost by sharing with other models.

(3) By adjusting the aperture amount by the aperture adjustment plate, the aperture amount set by the tuning can be conveniently adjusted in accordance with the contents of the work temporarily. This reduces the amount of bypass cooling air passing through the openings in the cooling wind of the cooling fan, and instead increases the amount of normal cooling air passing through the oil cooler, thereby reducing the cooling capacity of the radiator. In addition, it is possible to increase the cooling capacity of the oil cooler. Therefore, in addition to the above-described tuning (1) and (2) in order to eliminate the excessive shortage of cooling in the normal working condition with the highest frequency of use, and to make the horsepower of the cooling fan to the minimum required, The opening amount can be arbitrarily adjusted by changing the opening / closing degree of the opening / closing cover of the opening adjustment plate even under the heat of the engine and the hydraulic oil in the state. As a result, it is possible to cope with various work contents and to improve the versatility.

(4) In recent years, reduction of carbon dioxide emissions is a problem in all fields, and construction machinery is no exception. Therefore, while it is a task to develop a low-fuel engine, it is also a problem to improve the fuel efficiency of each work load by effectively using the output of the engine when the engine is mounted on a construction machine for work. Based on the above (1), (2) and (3), the horsepower consumption of the cooling fan required to cool the radiator water and the working oil can be minimized according to the work content, so that the fuel efficiency of each work can be improved. And it can solve one of the problems of the construction machine.

Claims (3)

In the installation structure of the radiator and oil cooler of a construction machine that cools the radiator coolant and the hydraulic oil by installing a cooling fan in front of the engine covered with the body exterior and installing a radiator and an oil cooler in front of the cooling fan. The radiator 43 and the oil cooler 44 are arranged so that the gap between one side opposite to the vehicle body exterior 5 is wider than the gap between the other sides, and provided near the air intake port 7 provided in the vehicle body exterior 5. The installation structure of the radiator and the oil cooler of the construction machine, characterized in that the gap between the wide side. 2. The opening adjusting plate (48, 58) according to claim 1, wherein the openings (48a, 59, 69) for holding a predetermined opening amount are provided in the wide gap between the radiator (43) and the oil cooler (44). 68) The installation structure of the radiator and oil cooler of the construction machine characterized in that attached. 2. The installation structure of a radiator and an oil cooler of a construction machine according to claim 1, wherein a net (49) is attached to a wider gap between the radiator (43) and the oil cooler (44).