JP2566836Y2 - Construction machine branch hose mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch hose mounting structure for reducing noise of a pump mainly provided in a construction machine such as a hydraulic shovel.

[0002]

2. Description of the Related Art FIG. 3 is a partially cutaway rear view of a hydraulic excavator having a conventional branch hose mounting structure. In the figure, 1 is a lower traveling body of a hydraulic shovel, 2
Is an upper revolving superstructure, 3 is a frame of the upper revolving superstructure 2, 4 is an engine mounting seat, 5 is an engine, 6 is an engine mounting bracket, 7 is a rubber mount, and 8 and 9 are hydraulic pumps. , 10 is a valve block, 1
Reference numerals 1 and 12 denote delivery port blocks provided to delivery ports (not shown) of the first pump 8 and the second pump 9, respectively, reference numerals 13 and 14 denote delivery hoses, and reference numerals 15 and 16 denote branch hoses. FIG. 4 is a detailed view of a portion A in FIG.

[0003] When the engine 5 of the hydraulic excavator is operated, the first pump 8 and the second pump 9 rotate, and discharge the pressurized oil. As shown in FIGS. 3 and 4, branch hoses 15 and 16 are attached to the delivery port blocks 11 and 12 of the first pump 8 and the second pump 9, respectively. Thus, the pump noise caused by the pressure oil pulsation frequency during the rotation of the pump is reduced.

[0004]

The branch hoses (15, 16) of the prior art, as shown in FIG. 4, are provided at the ends of the branch hoses (15, 16) with respect to a bracket on the rubber mount (7) for mounting the engine. The closure was fixed. For this reason, the branch hoses 15 and 16 may be piped in a state where they are forcibly bent, and may be damaged by vibration of a hydraulic shovel or the like, causing oil leakage. An object of the present invention is to provide a branch hose mounting structure that can solve the above problems.

[0005]

In the branch hose mounting structure of the present invention, a rigid branch hose is set to a predetermined size, and one end of the branch hose is connected to a delivery port side of a hydraulic pump and fixed. The closed other end was not fixed. Alternatively, one end of a branch hose is connected to each delivery port side of a plurality of hydraulic pumps driven by the engine, and the other end of each of the plurality of branch hoses is connected via an unfixed block member. Was configured.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially cutaway rear view of a hydraulic shovel having a branch hose mounting structure according to a first embodiment of the present invention. In the drawings, the same reference numerals are given to components using the same components as the conventional technology. Although the branch hoses 17 and 18 in the first aspect of the present invention are provided for the first pump 8 and the second pump 9, respectively, their mounting structures are the same. This will be described as a representative example. 2 'is the upper swing body of the excavator, 19 is the branch hose 18
Reference numeral 20 denotes a distal end closing portion.

Next, the branch hose mounting structure according to the first aspect of the present invention will be described with reference to FIG. The branch hose 18 having rigidity is set to a predetermined size L capable of exhibiting the pump noise reduction effect.
9 was connected to the delivery port block 12 of the second pump 9 and fixed, and the distal end closing portion 20 was not fixed but configured in a free state.

Next, the operation of the branch hose mounting structure according to the first aspect of the present invention will be described. Since the branch hose 18 has rigidity, when the proximal end opening portion 19 is connected to the delivery port block 12, the original shape can be substantially maintained without hanging around and deforming into a curved state. The above mounting operation simply connects the proximal end opening portion 19 to the delivery port block 12 and leaves the distal end closing portion 20 free without fixing, thereby greatly simplifying the mounting.
Further, the tip closing portion 20 does not come into contact with other parts in the vicinity when the pump rotates, and the branch hose 18 is forcibly bent and not restrained, so that breakage and oil leak accidents can be prevented. Further, since the length of the branch hose 18 is set to the predetermined dimension L, a pump noise reduction effect can be exhibited. Therefore, the function and durability of the branch hose are exhibited, so that the economy and maintenance of the branch hose can be improved.

Next, FIG. 2 is a partially cutaway rear view of a hydraulic shovel having a branch hose mounting structure according to a second aspect of the present invention. In the drawings, the same reference numerals are given to components using the same components as the conventional technology. 2'a
Is an upper swing body of a hydraulic shovel, 21 and 22 are connection pipes for the branch hose 23, 24 and 25 are connection pipes for the branch 26, and 27 is a block member. The block member 27 generally connects the connection pipes 22 and 25 in a closed state. However, if necessary, an internal passage may be formed to perform communication.

Next, a branch hose mounting structure according to a second aspect of the present invention will be described with reference to FIG. The branch hose 2 is connected to each of the delivery port blocks 11 and 12 of the two first pumps 8 and the second pump 9 driven by the engine 5.
The connection pipe 21 on the third side and the connection pipe 24 on the branch hose 26 side were connected respectively. The distal end of the connection pipe 22 on the branch hose 23 side and the distal end of the connection pipe 25 on the branch hose 26 side are connected via an unfixed block member 27.

Next, the operation of the branch hose mounting structure according to the second aspect of the present invention will be described. In the branch hose mounting structure of the second aspect, the distal end on the branch hose 23 side and the distal end on the branch hose 26 side are connected via the block member 27, so that the pressure oil pulsation frequency during the rotation of the pump is reduced. Depending on the wavelength, the overall length of the branch hose can be set considerably longer. Moreover, the rigidity of the branch hoses 23 and 26 can be increased by the interposition of the block member 27. Other functions and functions are the same as those of the branch hose mounting structure of the first aspect.

[0012]

In the prior art hydraulic excavator branch hose mounting structure, the base end of the branch hose is fixed to the delivery port side of the hydraulic pump, and the distal end is fixed to the bracket on the upper part of the rubber mount for mounting the engine. Was. For this reason, the branch hose may be piped in a state where it is forcibly bent, and may be damaged due to the vibration of the hydraulic excavator, causing oil leakage. However, in the branch hose mounting structure of the present invention, the rigid branch hose is set to a predetermined size, one end of the branch hose is connected to the delivery port side of the hydraulic pump and fixed, and the closed other end is not fixed. Configured. This allows the branch hose to be attached by simply connecting the one end to the delivery port side and leaving the closed other end free without fixing, thereby greatly simplifying the attachment. In addition, the original shape can be substantially maintained without the branch hose hanging around and being deformed into a curved state.
When the pump rotates, the branch hose does not come into contact with other parts nearby, and since the branch hose is not forcibly bent and restrained, breakage and oil leaks can be prevented. Further, since the length of the branch hose is set to a predetermined size, a pump noise reduction effect can be exhibited. Therefore, it demonstrates the function and durability of the branch hose,
The economical efficiency and maintainability of the branch hose can be improved.

Alternatively, in the present invention, one end of each branch hose is connected to each delivery port side of a plurality of hydraulic pumps driven by the engine, and the other ends of the plurality of branch hoses are not fixed. It was configured to be connected via a block member. In this branch hose mounting structure, the overall length of the branch hose can be set to be considerably long in accordance with the wavelength of the pressure oil pulsation frequency during the rotation of the pump. Moreover, the rigidity of the branch hose can be increased by providing the block member.

[Brief description of the drawings]

FIG. 1 is a partially cutaway rear view of a hydraulic shovel having a branch hose mounting structure according to a first embodiment of the present invention;

FIG. 2 is a partially cutaway rear view of a hydraulic shovel having a branch hose mounting structure according to a second embodiment of the present invention;

FIG. 3 is a partially cutaway rear view of a hydraulic shovel having a conventional branch hose mounting structure.

FIG. 4 is a detailed view of a portion A in FIG. 3;

[Explanation of symbols]

 2, 2 ', 2'a Upper rotating body 5 Engine 8, 9 First and second pumps 11, 12 Delivery port block 13, 14, 23, 26 Delivery hose 15, 16, 17, 18 Branch hose 19 Base end opening Part 20 Tip closing part 21, 22, 24, 25 Connection pipe 27 Block member

Claims (2)

(57) [Scope of request for utility model registration] 1. A branch hose, which is connected to a delivery port of a hydraulic pump driven by an engine mounted on a construction machine and is provided to reduce pump noise caused by a pressure oil pulsation frequency when the pump rotates. A branch hose having rigidity is set to a predetermined size, and one end of the branch hose is connected and fixed to the delivery port side of the hydraulic pump, and the closed other end is not fixed. A branch hose mounting structure for construction machinery. 2. A branch hose connected to a delivery port of a hydraulic pump driven by an engine mounted on a construction machine and provided to reduce pump noise caused by a pressure oil pulsation frequency when the pump rotates. One end of a branch hose is connected to each delivery port side of a plurality of hydraulic pumps driven by an engine, and the other end of each of the plurality of branch hoses is connected via a non-fixed block member. A branch hose mounting structure for a construction machine, wherein the branch hose is connected to the branch hose.