JP3566871B2 - Radiator piping structure for construction machinery - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a radiator for cooling an engine mounted on a construction machine such as a hydraulic shovel, and more particularly to a radiator piping structure for circulating cooling water between the engine and the radiator.
[0002]
[Prior art]
BACKGROUND ART Conventionally, in a hydraulic shovel as a construction machine, a hydraulic actuator, specifically a hydraulic motor provided in a lower traveling body, is controlled by controlling a supply amount and a flow direction of hydraulic oil discharged from a hydraulic pump. It drives a swing motor that swings the swing body, a hydraulic cylinder provided in each part of the front attachment, and the like.
[0003]
The hydraulic pump is driven by an engine, and the engine is provided with a radiator.
[0004]
Specifically, as shown in FIG. 4, the cooling water supplied from the radiator 10 is supplied to the engine 12 via the lower radiator hose 11, and the cooling water circulated in the engine 12 and heated to the upper radiator The radiator 10 is returned to the radiator 10 via the hose 13 and exchanges heat with the outside air taken in by the fan of the radiator 10 to lower the temperature. The cooling water is circulated between the radiator 10 and the engine 12 by a water pump attached to the engine 12, so as to prevent the engine 12 from overheating.
[0005]
Further, if the lower radiator hose 11 swings and repeatedly comes into contact with a member near the hose, the hose at the contact portion may be damaged and water may leak. Therefore, the lower radiator hose 11 is fixed to a bracket 15 extending from the engine 12 via a clip 14.
[0006]
[Problems to be solved by the invention]
However, in the conventional radiator piping structure, since the lower radiator hose 11 is fixed to the engine 12, it is inevitable that vibration generated from the engine 12 is transmitted during operation and resonates. Therefore, in order to safely dispose the lower radiator hose 11 without interfering with the reinforcing ribs 16a protruding on the revolving frame 16 and various parts mounted on the revolving frame 16, it is necessary to move the lower radiator hose 11 up and down as viewed from the hose cross-sectional direction. It is necessary to secure sufficient space in each of the left and right directions.
[0007]
For this reason, the conventional radiator piping structure has a problem that the size of the upper swing body cannot be reduced. In the structure in which the lower radiator hose 11 is fixed to the engine 12 that generates vibration, the bracket 15 is formed of a member having a large rigidity, and a clip having a high fastening force is used to prevent the lower radiator hose 11 from falling off. However, there is also a problem that the fixing structure of the lower radiator hose 11 is complicated.
[0008]
The present invention has been made in consideration of the above-described problems in the conventional radiator piping structure, and aims to reduce the size of the upper rotating body without securing a space for preventing interference around the cooling water supply piping. The present invention provides a radiator piping structure for a construction machine, which is capable of simplifying a fixing structure of a cooling water supply pipe.
[0009]
[Means for Solving the Problems]
The present invention relates to a radiator pipe structure for circulating cooling water to an engine of a construction machine, wherein a cooling water supply pipe configured to be started up from a lower part of the radiator and supplying cooling water to the engine from the lower part of the radiator is divided into two parts. In the turning frame between the engine and the radiator, a reinforcing rib is provided so that at least a part is located above the lower part of the radiator, and the reinforcing rib is provided so as to be located above the lower part of the radiator. A radiator of a construction machine having a joint means to be supported , a lower part of the radiator and the joint means being connected by a first cooling water supply pipe, and a joint means and an engine being connected by a second cooling water supply pipe. It is a piping structure .
[0010]
According to the present invention, a cooling water supply pipe for supplying cooling water to the engine is configured by divided first and second cooling water supply pipes, and each cooling water supply pipe is provided between the engine and the radiator. The first cooling water supply pipe connecting the joint means and the lower part of the radiator is configured to be connected by the joint means provided on the reinforcing rib of the turning frame , so that the first cooling water supply pipe is affected by vibration generated from the engine. There is no. On the other hand, the vibration of the engine affects the second cooling water supply pipe. However, since one end of the hose is fixed to the joint means in a stationary state, the runout of the hose is extremely small. This eliminates the need to secure a space around the cooling water supply pipe for preventing interference.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.
[0012]
FIG. 1 shows a configuration in which a radiator piping structure of a construction machine according to the present invention is applied to a hydraulic shovel, and shows a state where the hydraulic shovel is viewed from the rear.
[0013]
In the figure, a hydraulic shovel has a turning frame 1 mounted on an upper portion of a lower traveling body (not shown), a front attachment including a boom, an arm, and a bucket, a cabin on which an operator rides, an engine unit, and a lower traveling device. A hydraulic motor for controlling hydraulic actuators such as a body hydraulic motor, a swing motor for swinging the upper swing body, a hydraulic cylinder for driving a front attachment, and the like are provided.
[0014]
In the above-described hydraulic equipment, a hydraulic pump that supplies pressure oil to each hydraulic actuator is driven by an engine 2, and the engine 2 is provided with a radiator 3.
[0015]
The radiator 3 and the engine 2 are connected by an upper radiator hose 4 as a cooling water return pipe and a lower radiator hose 5 as a cooling water supply pipe. Cooling water that has been heat-exchanged and cooled by the cooling fan 3a of the radiator 3 is supplied to the engine 2 from a lower portion of the radiator 3 by a water pump, and circulates inside the engine 2 to exchange heat with the engine 2 and raise the temperature of the cooling water. It is sent out from the upper part of the engine 2 and returned to the radiator 3 via the upper radiator hose 4. In the drawing, white arrows indicate the supply direction of the cooling water, and black arrows indicate the return direction of the cooling water.
[0016]
Next, the piping structure of the lower radiator hose 5, which is a feature of the present invention, will be described.
[0017]
The lower radiator hose 5 includes a first hose 5a as a first cooling water supply pipe and a second hose 5b as a second cooling water supply pipe, and the first hose 5a and the second hose 5b are , Are connected via an intermediate connecting pipe 6 as joint means.
[0018]
The intermediate connection pipe 6 is fixed to an upper surface 7 a of an H-shaped reinforcing rib 7 which forms a part on the revolving frame 1. The reinforcing ribs 7 reinforce the plate-shaped revolving frame 1 so as to obtain sufficient rigidity with respect to a counterweight attached to a rear portion of the upper revolving structure. As shown, the front revolving body is disposed in the front-rear direction, and the front end communicates with a plate that reinforces a swing fulcrum of a boom (not shown).
[0019]
In the lower radiator hose 5 disposed over the reinforcing ribs 7 in the left-right direction, the first hose 5a moves on the turning frame 1 along the radiator 3 from the radiator hose mounting port 3a provided at the lower part of the radiator 3. It is crawled, raised almost vertically, and connected to the intermediate connection pipe 6.
[0020]
On the other hand, the second hose 5b has one end connected to the intermediate connection pipe 6 and the other end raised from the intermediate connection pipe 6 and connected to the cooling water inlet 2a of the engine 2. 1 and 2, reference numeral 8 denotes a counterweight, and reference numeral 9 denotes an engine cover.
[0021]
FIG. 3 is an exploded view of the connection state between the intermediate connection pipe 6 and the lower radiator hose 5.
[0022]
In the figure, an intermediate connecting pipe 6 includes a pipe 6a, a clip 6b attached to the middle of the pipe 6a, an L-shaped connecting plate 6c for fixing the clip 6b to a reinforcing rib upper surface 7a, and a clip 6b. The connection plate 6c includes bolts 6d for fastening the plate 6c to the reinforcing rib upper surface 7a. The first hose 5a is fixed to the intermediate connection pipe 6 by fitting the end of the first hose 5a to one end of the pipe 6a and tightening the end of the hose with the fastener 5c. Also, by fixing the second hose 5b to the other end of the pipe 6a in the same manner as the first hose 5a, the two hoses 5a and 5b are connected. Unlike the engine 2, the plate 6c for fixing the pipe 6a is attached to the reinforcing rib 7 of the revolving frame 1 which does not vibrate. Therefore, it is necessary to use a member having high rigidity in consideration of vibration. There is no.
[0023]
The intermediate connection pipe 6 serves to position the first hose 5a and the second hose 5b. For example, the first hose 5a is fitted to one end of the pipe 6a and pushed until it comes into contact with the clip 6b. Thus, predetermined gaps S1 and S2 are secured between the first hose 5a and the reinforcing ribs 7. Therefore, there is no variation in assembly accuracy between operators, and the lower radiator hose 5 can be arranged in a short time. The second hose 5b can be positioned similarly to the first hose 5a.
[0024]
In the lower radiator hose 5 arranged as described above, the first hose 5a is connected to the non-vibrating intermediate connection pipe 6 and the radiator 3, so that the first hose 5a is not affected by the vibration generated by the engine 2. Therefore, in order to avoid interference with the reinforcing ribs 7 of the frame 1 or to avoid interference with various components mounted on the frame 1, the lower radiator hose 5 needs to be disposed apart from the reinforcing ribs 7 and various components. There is no.
[0025]
Further, although the vibration of the engine 2 propagates to the second hose 5b, one end of the second hose 5b is connected to the intermediate connecting pipe 6 which does not itself vibrate. The deflection of the second hose 5b is much smaller than the method of fixing the lower radiator hose to the two main bodies via the bracket. Therefore, it is not necessary to secure a space around the lower radiator hose 5 for preventing interference.
[0026]
In the present invention, any joint structure can be adopted as the joint means as long as it can connect the lower radiator hose 5 divided into two parts by a turning frame between the engine 2 and the radiator 3. .
[0027]
【The invention's effect】
As is apparent from the above description, according to the present invention, it is not necessary to secure a space for preventing interference around the cooling water supply pipe, so that the size of the upper-part turning body can be reduced.
[0028]
Further, according to the present invention, since the cooling water supply pipe divided into two parts is fixed by connecting to the joint means, the cooling water supply pipe is directly fixed to the revolving frame. Thus, there is an advantage that it can be securely fixed without giving excessive tightening force.
[0029]
Further, according to the present invention, the structure for fixing the cooling water supply pipe can be simplified.
[0030]
Further, since the cooling water supply pipe of the present invention is constituted by two parts, a part of the cooling water supply pipe can be removed. Therefore, for example, if the first cooling water supply pipe is removed from the joint means, the radiator can be easily removed and maintenance can be facilitated.
[Brief description of the drawings]
FIG. 1 is a front view showing a radiator piping structure of a construction machine according to the present invention.
FIG. 2 is a plan view of FIG.
FIG. 3 is an exploded perspective view showing the configuration of the joint means of the present invention.
FIG. 4 is a perspective view showing a conventional radiator piping structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Swivel frame 2 Engine 3 Radiator 4 Upper radiator hose 5 Lower radiator hose 6 Intermediate connecting pipe 7 Reinforcement rib 8 Counterweight

Claims (1)

In a radiator piping structure that circulates cooling water to the engine of construction machinery,
A cooling water supply pipe configured to be started from a lower part of the radiator and supplying cooling water to the engine from the lower part of the radiator is divided into two parts ,
A revolving frame between the engine and the radiator is provided with a reinforcing rib at least partially located above a lower portion of the radiator,
Wherein said coupling means is supported by the reinforcing rib is provided so as to be positioned above the lower portion of the radiator, this coupling means and the bottom of the radiator are connected by a first coolant supply pipe Rutotomoni, the joint A radiator piping structure for a construction machine, wherein the means and the engine are connected by a second cooling water supply pipe.

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