JP4412607B2 - Hydraulic hose protection structure - Google Patents

Description

  The present invention belongs to the technical field of a protective structure for a hydraulic hose in a construction machine such as a hydraulic excavator.

Generally, in construction machines such as hydraulic excavators, the engine room in which the engine is housed is separated by a partition wall such as a firewall so that the heat and noise of the engine are prevented from leaking outside the engine room. In this case, however, the engine compartment is in a considerably high temperature region.
By the way, hydraulic equipment such as a hydraulic pump for driving a cooling fan (a fan for cooling a cooling device such as a radiator or an oil cooler) may be arranged in the engine compartment partitioned by the partition wall. When the hydraulic equipment is arranged in the engine compartment in this way, the hydraulic hose connected to the hydraulic equipment passes through the engine compartment which is a high temperature region. For this reason, conventionally, a hydraulic hose that passes through the engine compartment has been used as a highly heat-resistant hose. In such a case, the oil may leak from the hydraulic hose, and the oil may be scattered in the engine room which is a high temperature region.
Therefore, a technique has been proposed in which a protective cover that covers the tightening portion is provided at the tightening portion of the joint that connects the hydraulic hose and the hydraulic equipment, and the protective cover is formed of a mesh assembly having a mesh. (For example, refer to Patent Document 1).
JP 2004-225454 A

  However, since the thing of the said patent document is a thing of the structure which covers a joint part with a protective cover, although it can respond to the oil leak from a joint part, it may contact peripheral equipment by aged deterioration, a body vibration, etc. Thus, the hydraulic hose is worn out, and the oil leaks from the worn part of the hose. Furthermore, since the protective cover is formed of a netting material, the oil leaked from the protective cover is dripped through the mesh, which is not preferable for fire prevention if the dripped part is in the engine room in a high temperature region. There is a problem to be solved by the present invention.

The present invention has been created in order to solve these problems in view of the above-described circumstances, and the invention of claim 1 includes a hydraulic device disposed in an engine compartment partitioned by a partition wall. In a construction machine provided with a hydraulic hose that connects a hydraulic device disposed outside the engine room, the outer peripheral side of the engine chamber disposed part of the hydraulic hose is covered with a heat-resistant tube member, and the tube member Is characterized in that it extends to the outside of the engine compartment in order to guide the oil leaked from the hydraulic hose to the outside of the engine compartment.
And by doing in this way, the engine indoor arrangement | positioning site | part of a hydraulic hose can be protected by a tube member, and even if oil leaks from a hydraulic hose by aged deterioration etc., the leaked oil is tube It will be guided to the outside of the engine room by the member, and therefore it can be surely prevented that the oil is scattered in the engine room, which can greatly contribute to the improvement of the reliability.
According to a second aspect of the present invention, in the first aspect, the tube member is characterized in that the end portion on the engine chamber inner side is sealed, while the outer end portion of the engine chamber is open.
In this way, when oil leaks from the hydraulic hose into the tube member, the oil can be prevented from leaking into the engine chamber from the end of the tube member inside the engine chamber. The oil is discharged from the outer end of the engine compartment to the outside of the engine compartment.
The invention of claim 3 is characterized in that, in claim 1 or 2, the hydraulic hose is routed so that the end of the tube member inside the engine chamber is high and the end of the engine chamber outside is low. It is.
And by doing in this way, the oil which leaked in the protection tube from the hydraulic hose can be guide | induced naturally outside an engine compartment.

  Next, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a hydraulic excavator. The hydraulic excavator 1 is mounted on a crawler-type lower traveling body 2, an upper revolving body 3 that is pivotably provided above the lower traveling body 2, and the upper revolving body 3. The upper revolving unit 3 is equipped with a power mechanism such as a cab 5, a fuel tank 6, a hydraulic oil tank 7, an engine 8, various devices, a counterweight 9, and the like. The basic configuration is the same as before.

  In the present embodiment, the engine 8 is housed in an engine room 10 disposed at a substantially central part in the left-right direction at the rear part of the machine body. The engine 8 is driven on one side of the engine room 10 in the left-right direction. A pump chamber 12 in which the main pump 11 is accommodated is arranged, and a cooling device 13 such as a radiator and an oil cooler, a cooling fan 14 for cooling the cooling device 13 and the like are accommodated on the other side in the left-right direction of the engine chamber 10. A cooling chamber 15 is disposed, and a valve chamber 17 in which the valve unit 16 is accommodated is disposed in front of the engine chamber 10. The engine chamber 10 and the pump chamber 12, the cooling chamber 15, and the valve chamber 17 are separated by a partition wall 18 such as a fire wall (fire wall). The configuration is such that leakage to the outside of the engine compartment 10 can be reduced as much as possible.

  On the other hand, 19 is a cooling pump as a drive source of the fan motor 20 incorporated in the cooling fan 14, and the cooling pump 19 is arranged on the side close to the cooling chamber 15 in the engine chamber 10. The cooling pump 19 is connected to a hydraulic hose 21 serving as a flow path for oil sucked up from the hydraulic oil tank 7 to the cooling pump 19.

  The hydraulic hose 21 is formed of a heat-resistant hose. One end of the hydraulic hose 21 is connected to the cooling pump 19, while the other end passes through the side of the engine 8 and connects the engine chamber 10 and the pump chamber 12. It penetrates the partition wall 18 and is connected to a supply pipe 22 provided in the pump chamber 12. In this case, as shown in FIGS. 3 and 4, the hydraulic hose 21 has a high end at one end connected to the cooling pump 19 and a low end toward the other end that penetrates the partition wall 18 and reaches the pump chamber 12. Is routed to. The supply pipe 22 is a hydraulic pipe serving as a flow path for hydraulic oil supplied from the hydraulic oil tank 7 to various hydraulic pumps.

  Here, 23 is a joint for connecting the hydraulic hose 21 to the cooling pump 19, and one end of the joint 23 is fastened to the cooling pump 19 via the flange 24, while One end side of the hydraulic hose 21 is fastened to the fastening cylinder portion 23a formed on the end side by means such as caulking.

  Furthermore, 25 is a protective tube as a tube member that covers the outer peripheral side of the engine chamber 10 of the hydraulic hose 21. The protective tube 25 is formed using a heat-resistant and flexible silicon material. In addition, the inner diameter of the protective tube 25 is formed larger than the outer diameter of the hydraulic hose 21 so that a gap S exists between the inner peripheral surface of the protective tube 25 and the outer peripheral surface of the hydraulic hose 21. One end side of the protective tube 25 is closely attached to the outer peripheral surface portion of the fastening cylinder portion 23a of the joint 23 by means such as heat shrinkage, and thus one end side of the protective tube 25 is It is in a sealed state. On the other hand, the other end side of the protection tube 25 extends through the partition wall 18 to the pump chamber 12, that is, the outside of the engine chamber 10, and the other end side of the protection tube 25 has an opening 25a. In addition, the gap S between the protective tube 25 and the hydraulic hose 21 is in communication with the outside.

  In the present embodiment configured as described, the hydraulic hose 21 includes a cooling pump 19 disposed in the engine chamber 10 and a supply pipe disposed in the pump chamber 12 separated from the engine chamber 10 by a partition wall 18. However, the portion of the hydraulic hose 21 where the engine room 10 is disposed is covered with a protective tube 25 made of silicon material having heat resistance and flexibility. Moreover, the protective tube 25 extends through the partition wall 18 to the pump chamber 12, that is, to the outside of the engine chamber 10, and the inner end of the protective tube 25 is sealed. The outer end of the engine compartment 10 has an opening 25a.

  As a result, the portion of the hydraulic hose 21 disposed in the engine compartment 10 is protected by the protective tube 25, and the hydraulic hose 21 comes into contact with peripheral devices due to airframe vibration or the like and is damaged or worn. Even if the hydraulic hose 21 is cracked due to aging or the like, and the oil leaks from the hydraulic hose 21, the leaked oil is scattered in the engine compartment 10. Can be prevented. Moreover, the oil leaked from the hydraulic hose 21 is guided to the outside of the engine compartment 10 through the inside of the protection tube 25 and discharged from the opening 25a at the outer end of the engine compartment 10 of the protection tube 25. Thus, it is possible to reliably prevent the oil from splashing into the engine compartment 10 which is a high temperature region, which can greatly contribute to the improvement of reliability.

  Furthermore, since the hydraulic hose 21 is routed so that the inner end of the engine chamber 10 of the protective tube 25 becomes higher and the outer end of the engine chamber 10 becomes lower, the hydraulic hose 21 leaks into the protective tube 25 from the hydraulic hose 21. The oil is naturally guided outside the engine compartment 10 and discharged from the opening 25a at the outer end of the engine compartment 10. Even when such routing is difficult, since the inner end of the protective tube 25 in the engine compartment 10 is sealed, the oil in the protective tube 25 may leak into the engine compartment 10. It can be avoided reliably.

  In addition to the hydraulic hose 21, the cooling pump 19 includes a hydraulic hose 26 that serves as a flow path for oil supplied from the cooling pump 19 to the fan motor 20, and a drain that is discharged from the cooling pump 19. A hydraulic hose 27 serving as a flow path is connected. The portions of the hydraulic hoses 26 and 27 disposed in the engine chamber 10 are also covered with protective tubes 28 and 29 that match the outer diameters of the hoses, and the protective tubes 28 and 29 extend to the outside of the engine chamber 10. It is extended, and there exists an effect similar to the protection tube 25 mentioned above.

  Of course, the present invention is not limited to the above embodiment, and the hydraulic equipment disposed in the engine compartment may be a hydraulic equipment other than the cooling pump. In the present embodiment, Although the hydraulic excavator is illustrated as the construction machine, it is needless to say that the construction machine can be applied to other construction machines such as a wheel loader.

It is a partially cutaway top view of a hydraulic excavator. It is a top view of an engine room and its peripheral part. It is a figure which shows the routing of a hydraulic hose. It is a figure which shows the routing of a hydraulic hose. (A) is a figure which shows the state which covered the hydraulic hose with the protection tube, (B) is sectional drawing of (A).

Explanation of symbols

10 Engine compartment 18 Bulkhead 19 Hydraulic equipment (cooling pump)
21 Hydraulic hose 25 Tube member (protection tube)
28 Tube member (protection tube)
29 Tube member (protection tube)

Claims (3)

  In a construction machine comprising a hydraulic hose arranged in an engine compartment separated by a partition wall and a hydraulic hose connecting the hydraulic equipment arranged outside the engine compartment, the outer peripheral side of the engine compartment arrangement portion of the hydraulic hose The hydraulic hose protective structure is characterized in that the tube member is covered with a heat-resistant tube member, and the tube member is extended to the outside of the engine compartment to guide the oil leaked from the hydraulic hose to the outside of the engine compartment.   2. The hydraulic hose protection structure according to claim 1, wherein the tube member is sealed at an end portion on the inner side of the engine compartment, and is opened at an outer end portion of the engine compartment.   3. The protection structure for a hydraulic hose according to claim 1, wherein the hydraulic hose is routed so that an end portion of the tube member on the engine room side is high and an end portion of the engine room outside is low.

Images