JP7256959B2 - construction machinery - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine, and more particularly to a construction machine provided with piping connecting an engine and an oil filter.

2. Description of the Related Art In construction machinery, an oil filter is provided to filter foreign matter mixed in engine oil. For example, in Patent Document 1, an oil filter (30) is connected to an engine (26) via a pipe (50) (see FIGS. 3 and 4 of Patent Document 1). More specifically, the pipe (50) passes under the engine (26) and hydraulic pump (28) and is directly connected to the oil filter (30). A hose (52) forming the pipe (50) is connected to the joint (51a) in a gently bent state.

JP 2017-160751 A

In Patent Document 1 described above, it is difficult to wire the pipe (50) from the engine (26) to the oil filter (30) or fix the hose (52) in a narrow space during maintenance work or assembly work. There is a problem.

In addition, in Patent Document 1 described above, since the pipe (50) is routed to avoid the engine (26) and the hydraulic pump, the pipe (50) is inevitably long, and the engine passing through the pipe (50) The oil pressure loss also increases.

Furthermore, in Patent Document 1, the hose (52) passes under the engine (26), so there is a risk that the hose (52) may be crushed by other parts during assembly.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a technique for piping that connects an engine and an engine oil filter in a construction machine with high maintainability and assembly workability.

In order to achieve the above object, the present invention provides a flywheel housing that houses a flywheel connected to an engine, a pump bracket that is arranged on the side of the flywheel housing and supports a hydraulic pump, and the hydraulic pump. and an engine oil filter for filtering engine oil. A discharge port is formed on the side of the engine for discharging the engine oil toward the engine oil filter. , an intake port for sucking the engine oil that has passed through the engine oil filter is formed, and an exhaust pipe and an intake pipe are connected to the exhaust port and the intake port, respectively, and the flywheel housing or The pump bracket is formed with a discharge oil passage to which the discharge pipe can be connected and a suction oil passage to which the suction pipe can be connected, and an end portion of the discharge oil passage to which the discharge pipe is connected; An end portion of the suction oil passage to which the suction pipe is connected is located above the mount bracket and above the discharge port and the suction port when viewed from the wiring direction of the discharge pipe and the suction pipe. The construction machine is arranged at a position not overlapping with the engine on the side where the is formed.

Here, the engine oil filter is arranged on the side where the discharge port and the intake port are formed when viewed from the installation direction, and the discharge oil passage extends between the discharge port and the engine oil filter. and the suction oil passage is formed in the flywheel housing or the pump bracket along a straight line connecting the suction port and the engine oil filter. is preferably formed in a straight line.

Further, the oil discharge passage and the oil suction passage are formed in the flywheel housing, and the oil discharge passage and the oil suction passage are arranged in parallel in the circumferential direction along the outer periphery of the flywheel housing. is preferred.

According to the present invention, since the oil discharge passage and the oil suction passage are formed in the flywheel housing or the pump bracket, the discharge pipe and the suction pipe can be shortened, and the fixing member for fixing the discharge pipe and the suction pipe. does not require Also, when viewed from the wiring direction of the discharge pipe and the intake pipe, the end of the oil discharge passage and the end of the oil suction passage are located above the mount bracket and on the side where the discharge port and the suction port are formed. is placed in a position that does not overlap the Therefore, there is no possibility that the discharge pipe and the suction pipe will be crushed by other parts during assembly. Therefore, the present invention has high maintainability and assembly workability with respect to the piping that connects the engine and the engine oil filter in the construction machine.

1 is a perspective view showing a hydraulic excavator according to an embodiment of the present invention; FIG. II arrow view of FIG. 1 (schematic diagram showing the inside of the engine room). FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2; The top view which shows the inside of the engine room which concerns on a 1st modification. FIG. 5 is a cross-sectional view taken along the line VV in FIG. 4; The top view which shows the inside of the engine room which concerns on a 2nd modification.

<1. embodiment>
A construction machine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. Below, the hydraulic excavator 1 shown in FIG. 1 is illustrated as an example of a construction machine.

As shown in FIG. 1 , the hydraulic excavator 1 includes a crawler-type lower running body 2 and an upper revolving body 3 provided on the lower running body 2 so as to be able to turn.

The upper revolving body 3 includes a cab 31, an attachment 33, an engine room (mechanical housing portion) 35, and the like. Various devices for hydraulically controlling the undercarriage 2 and the attachment 33 are arranged inside the engine room 35 . Various operations such as excavation are performed by an operator operating these devices.

FIG. 2 is a schematic configuration diagram of various devices installed inside the engine room 35 when viewed from the center side of the machine to the rear side of the machine. As shown in FIG. 2, the radiator 4, the engine 5, the flywheel housing 6, the pump bracket 7, the hydraulic pump 8, and the engine oil filter 9 are installed in the engine room 35. As shown in FIG.

The radiator 4 is installed at the left end of the engine room 35 and consists of a cooling fan and a heat exchanger.

The engine 5 is installed laterally on the right side of the radiator 4 so that the rotation axis coincides with the machine width direction. A discharge port 51 and an intake port 53 are formed on the side (front) of the engine 5 .

The discharge port 51 is a port for discharging engine oil containing impurities (engine oil before filtration) toward the engine oil filter 9 . A discharge hose 91</b>A for sending the engine oil discharged from the discharge port 51 to the engine oil filter 9 is connected to the discharge port 51 .

The intake port 53 is a port for sucking the engine oil from which impurities have been removed in the engine oil filter 9 (filtered engine oil). A suction hose 93</b>A for returning engine oil to the engine 5 after passing through the engine oil filter 9 is connected to the suction port 53 .

The flywheel housing 6 is a member for housing a flywheel (not shown), and is provided on the right side of the engine 5 so as to be continuous with the body portion of the engine 5 . A flywheel is a well-known thick disc-shaped member that rotates around a rotation axis together with a crankshaft (not shown).

The flywheel housing 6 is formed with an oil discharge passage 61 for sending the engine oil discharged from the discharge port 51 to the engine oil filter 9 . Further, the flywheel housing 6 is formed with an intake oil passage 63 for returning the engine oil that has passed through the engine oil filter 9 to the engine 5 .

As shown in FIG. 3 , the oil discharge passage 61 and the oil suction passage 63 are arranged in parallel in the circumferential direction along the outer circumference of the flywheel housing 6 . In other words, the oil discharge passage 61 and the oil suction passage 63 are arranged at positions that do not contact the flywheel (not shown).

As shown in FIG. 2, the oil discharge passage 61 is connected to a discharge hose 91A, and the suction oil passage 63 is connected to a suction hose 93A.

The pump bracket 7 is a member for holding the hydraulic pump 8 and is provided continuously with the flywheel housing 6 on the right side of the flywheel housing 6 .

As shown in FIGS. 2 and 3, a pair of mounting brackets 50, 50 for mounting the hydraulic pump 8 are provided on the lower surface of the pump bracket 7 so as to protrude to the opposite side (right side) of the flywheel housing 6. It is Here, the mount brackets 50 , 50 are integrally configured with the pump bracket 7 .

The hydraulic pump 8 is attached in series with the engine 5 via the pump bracket 7 mentioned above.

The engine oil filter 9 is a filter for filtering engine oil containing impurities, and is provided on the right side of the pump bracket 7 (the right end of the engine room 35). The engine oil filter 9 can be maintained through the inspection door 351 shown in FIG.

As shown in FIG. 2, the engine oil filter 9 is connected to a discharge oil passage 61 and a suction oil passage 63 of the flywheel housing 6 via a discharge hose 91B and a suction hose 93B, respectively.

As shown in FIG. 3 , the oil discharge passage 61 and the oil suction passage 63 are arranged from the mount bracket 50 when viewed from the wiring direction (machine width direction) of the discharge hoses 91A, 91B and the suction hoses 93A, 93B. is arranged at a position not overlapping with the engine 5 on the upper side and the side (front side) where the discharge port 51 and the intake port 53 are formed.

In this embodiment, as shown in FIG. 2, the engine oil filter 9 is arranged on the side where the discharge port 51 and the intake port 53 are formed (machine front side).

The oil discharge passage 61 described above is formed in the flywheel housing 6 along a straight line connecting the oil discharge port 51 and the engine oil filter 9 . Similarly, the intake oil passage 63 described above is formed in the flywheel housing 6 along a straight line connecting the intake port 53 and the engine oil filter 9 .

That is, as shown in FIG. 2, the piping route (discharge hose 91A, discharge oil passage 61, and discharge hose 91B) from the discharge port 51 to the engine oil filter 9 is formed substantially in a straight line. Further, the piping route (the suction hose 93A, the suction oil passage 63 and the suction hose 93B) from the suction port 53 to the engine oil filter 9 is formed substantially in a straight line.

According to the above-described embodiment, the oil discharge passage 61 and the oil suction passage 63 are formed in the flywheel housing 6, the discharge hoses 91A and 91B are connected to the ends of the oil discharge passage 61, and the ends of the oil suction passage 63 are connected to the ends of the oil suction passage 63. Intake hoses 93A and 93B are connected to the portion. That is, the piping is divided into four hoses (discharge hoses 91A, 91B and suction hoses 93A, 93B). Therefore, each hose (discharge hoses 91A, 91B and suction hoses 93A, 93B) can be made short.

Therefore, fixing members (such as brackets) for fixing the discharge hoses 91A and 91B and the suction hoses 93A and 93B are not required. Therefore, no clearance is required between the fixed member and the equipment on the machine side, and it is possible to realize a piping configuration with a minimum clearance in a narrow space.

When viewed from the direction in which the discharge hoses 91A, 91B and the suction hoses 93A, 93B are routed (see FIG. 3), the oil discharge passage 61 and the oil suction passage 63 are above the mount bracket 50 and the discharge port 51 , and is arranged at a position not overlapping the engine 5 on the side where the intake port 53 is formed. Therefore, the discharge hoses 91A, 91B and the suction hoses 93A, 93B are routed at a relatively high position, and there is no possibility that the discharge hoses 91A, 91B and the suction hoses 93A, 93B will be crushed by other parts during assembly. , there is no need to perform curing work.

In addition, since the discharge oil passage 61 and the suction oil passage 63 are formed in the flywheel housing 6, there is no need to mark the fixing portion of the hose or adjust the fixing position, thereby reducing variations in assembly. is possible.

Thus, the above-described embodiment has high maintainability and assembly workability for the discharge hoses 91A, 91B and the suction hoses 93A, 93B that connect the engine 5 and the engine oil filter 9 in the hydraulic excavator 1. there is

In the above-described embodiment, as shown in FIG. 2, the piping route (discharge hose 91A, oil discharge passage 61, and discharge hose 91B) from the discharge port 51 to the engine oil filter 9 is formed substantially in a straight line. ing. Further, the piping route (the suction hose 93B, the suction oil passage 63 and the suction hose 93A) from the engine oil filter 9 to the suction port 53 is formed substantially on a straight line.

Therefore, since the discharge hoses 91A, 91B and the suction hoses 93A, 93B can be constructed in the shortest possible time, the pressure loss of the hoses can be reduced, and the hydraulic pressure rising time can be shortened. Further, it is possible to reduce the risk of damage to the engine due to lack of oil film caused by the oil pressure build-up time when the engine is started immediately after the engine oil and the engine oil filter 9 are replaced.

Further, in the above-described embodiment, as shown in FIG. 3 , the oil discharge passage 61 and the oil suction passage 63 are arranged in parallel in the circumferential direction along the outer circumference of the flywheel housing 6 . Therefore, the shape change of the flywheel housing 6 can be minimized, and the cost associated with the shape change can be reduced while ensuring the clearance with other parts.

As an alternative to the above-described embodiment, it is possible to provide a fixing member shaped like a hose and configure only undivided hose piping. , maintainability and quality reliability are left to the user, and are not necessarily effective.

<2. Variation>
The construction machine according to the present invention is not limited to the above-described embodiment, and various modifications and improvements are possible within the scope of the claims.

For example, in the above-described embodiment, as shown in FIG. 1, the inspection door 351 is formed on the right side of the engine room 35, and the engine oil filter 9 is arranged near the inspection door 351 (right end of the engine room 35). Although the case where it is exemplified, it is not limited to this.

As shown in FIG. 4, in some small construction machines, an inspection door 351 is arranged at the rear of the machine. In that case, the engine oil filter 9 is provided on the outer peripheral surface (rear side) of the flywheel housing 6, as shown in FIGS.

In this modification, a discharge oil passage 61 and a suction oil passage 63 are formed inside the outer edge of the flywheel housing 6 along the circumferential direction. One end of the oil discharge passage 61 is connected to the discharge port 51 via a discharge hose 91A. One end of the suction oil passage 63 is connected to the suction port 53 via a suction hose 93A. On the other hand, the other end of the oil discharge passage 61 and the other end of the oil intake passage 63 are both directly connected to the engine oil filter 9 .

According to the modified example described above, when viewed from the wiring direction of the discharge hose 91A and the suction hose 93A (see FIGS. 4 and 5), the end of the discharge oil passage 61 to which the discharge hose 91A is connected And the end of the suction oil passage 63 to which the suction hose 93A is connected is arranged at a position above the mount bracket 50 and not overlapping the engine 5 . Therefore, the discharge hose 91A and the suction hose 93A are routed at a relatively high position, there is no risk of being crushed by other parts during assembly, and there is no need to perform curing work as in the above embodiment.

In addition, since the other end of the oil discharge passage 61 and the other end of the oil intake passage 63 are directly connected to the engine oil filter 9, the number of parts is reduced and the assembling efficiency is improved.

Furthermore, since the oil discharge passage 61 and the oil suction passage 63 formed in the flywheel housing 6 are relatively long, it is possible to increase the amount of heat released by the cooling air and suppress the temperature rise of the engine oil. .

Further, in the above-described embodiment, as shown in FIG. 2, the flywheel housing 6 is formed with the discharge oil passage 61 and the suction oil passage 63, but the present invention is not limited to this. As shown in FIG. 6 , the pump bracket 7 may be formed with an oil discharge passage 71 and an oil suction passage 73 . In that case, as in the above embodiment, when viewed from the wiring direction of the discharge hose 91A and the suction hose 93A, the discharge oil passage 71 and the suction oil passage 73 are above the mount bracket 50 and do not overlap the engine 5. placed in position.

Further, in the above-described embodiment, the discharge hose 91A and the suction hose 93A are illustrated as examples of the discharge pipe and the suction pipe according to the present invention, but the present invention is not limited to this. If the distance between the discharge port 51 and the suction port 53 and the flywheel housing 6 is short, the hose may not be used due to the problem of bending R. In that case, instead of the discharge hose 91A and the suction hose 93A, a steel discharge tube 91A and a suction tube 93A may be used.

If the discharge tube 91A and the suction tube 93A made of steel pipes are used, the degree of freedom in processing is increased, so even if the distance between the discharge port 51 and the suction port 53 and the flywheel housing 6 is short, it can be handled. It is possible. In addition, unlike rubber hoses, steel tubes do not require regular replacement due to deterioration of the material, and can extend the life of the machine. In addition, since the steel tube vibrates almost the same as the engine vibration, the influence of the vibration of the piping is eliminated. Furthermore, since the amount of heat released is greater than that of rubber hoses, the risk of damage to the engine due to lack of oil film due to a decrease in oil viscosity can be further reduced.

INDUSTRIAL APPLICABILITY As described above, the construction machine according to the present invention is suitable for a hydraulic excavator equipped with a pipe connecting an engine and an engine oil filter.

1 hydraulic excavator, 2 lower running body, 3 upper revolving body, 4 radiator, 5 engine,
6 flywheel housing, 7 pump bracket, 8 hydraulic pump,
9 engine oil filter, 31 cab, 33 attachment,
35 engine room, 50 mount bracket, 51 exhaust port, 53 intake port,
61 discharge oil passage, 63 suction oil passage, 91A, 91B discharge hose,
93A, 93B suction hose, 351 inspection door

Claims (3)

a flywheel housing containing a flywheel connected to the engine;
a pump bracket disposed on the side of the flywheel housing and supporting a hydraulic pump;
a mount bracket integrally provided with the pump bracket at a lower portion of the pump bracket ;
an engine oil filter for filtering engine oil;
with
A discharge port for discharging the engine oil toward the engine oil filter is formed on the side of the engine, and an intake port for sucking the engine oil that has passed through the engine oil filter is formed. is,
A discharge pipe and a suction pipe are connected to the discharge port and the suction port, respectively,
The flywheel housing or the pump bracket is formed with a discharge oil passage to which the discharge pipe can be connected and a suction oil passage to which the suction pipe can be connected,
When the end of the oil discharge passage to which the discharge pipe is connected and the end of the suction oil passage to which the suction pipe is connected are viewed from the wiring direction of the discharge pipe and the suction pipe (2) The construction machine is arranged above the mount bracket and on the side where the exhaust port and the intake port are formed so as not to overlap the engine. The engine oil filter is arranged on the side where the discharge port and the intake port are formed when viewed from the installation direction,
The oil discharge passage is formed linearly in the flywheel housing or the pump bracket along a straight line connecting the discharge port and the engine oil filter,
2. The construction machine according to claim 1, wherein the intake oil passage is formed linearly in the flywheel housing or the pump bracket along a straight line connecting the intake port and the engine oil filter. . The oil discharge passage and the oil suction passage are formed in the flywheel housing,
3. The construction machine according to claim 2, wherein the oil discharge passage and the oil suction passage are arranged in parallel in the circumferential direction along the outer circumference of the flywheel housing.

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