JP2001165038A - Oil hydraulic pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration of a hydraulic pipe due to pulsation, when an oil hydraulic pump is operated, and suppress transmission of vibration of a pulsation reducing hose to a structure in the periphery of the oil hydraulic pump. SOLUTION: A tip end side 21A of a pulsation reducing hose 21 connecting a base end side to a delivery port of an oil hydraulic pump 12 and a tip end side 23A of a pulsation reducing hose 23 connecting a base end side to a delivery port of an oil hydraulic pump 13 are connected by using an elastic ring 25, so as to be restricted by each other, and a free end without abutting to a turn frame 5 or the like is formed. In this way, in addition to that pulsation of pressure oil delivered to a delivery pipe 18 from the oil hydraulic pump 12 can be reduced by the pulsation reducing hose 21 and pulsation of pressure oil delivered to a delivery pipe 19 from the oil hydraulic pump 13 can be reduced by the pulsation reducing hose 23, transmission of vibration of each pulsation reducing hose 21, 23 to the turn frame 5 or the like can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pump device used for, for example, a hydraulic excavator, and more particularly to a hydraulic pump device capable of reducing pulsation of a hydraulic pipe connected to a discharge side of a hydraulic pump.

[0002]

2. Description of the Related Art In general, a traveling or working hydraulic circuit or the like mounted on a construction machine such as a hydraulic excavator or a hydraulic crane includes a hydraulic pump driven by a prime mover and a hydraulic oil supplied from the hydraulic pump. It is roughly constituted by a plurality of hydraulic actuators that operate and a plurality of hydraulic pipes connecting between these hydraulic actuators and the hydraulic pump.

[0003] Since hydraulic oil discharged from the hydraulic pump generates pulsation, among the hydraulic piping connecting the hydraulic pump and the hydraulic actuator, in particular, a hydraulic piping (discharge piping) on the discharge side connected to the discharge port of the hydraulic pump. ) Vibrate with the pulsation of the pressure oil flowing through it.

When the discharge pipe vibrates due to the pulsation of the pressure oil, a control valve connected to the discharge pipe,
Vibration propagates to hydraulic devices such as hydraulic actuators, and structures such as frames that support discharge pipes, and these hydraulic devices and structures are damaged, and the noise caused by the vibration causes deterioration of the working environment around the hydraulic pump. There is a problem that.

On the other hand, the discharge port of the hydraulic pump is
It is known that the pulsation of the pressure oil flowing through the discharge pipe can be reduced by connecting a pulsation reduction hose (hereinafter, referred to as a pulsation reduction hose) separately from the discharge pipe (for example, see Japanese Patent Application Laid-Open No. H08-108). No. 218426, JP-A-8-29
No. 6788).

Here, the pulsation reducing hose according to the above-mentioned prior art has a base end connected to a discharge port of a hydraulic pump and a distal end closed, and introduces a part of the pressure oil discharged from the hydraulic pump. The tip side is fixed via a bracket to a revolving frame or the like constituting an upper revolving unit of the hydraulic shovel.

The pulsation reducing hose reflects the pressure oil introduced from the hydraulic pump at the closed end on the distal end side, returns to the base end side, and merges with the pressure oil discharged into the discharge pipe. A configuration in which the pulsation of the pressure oil returned to the base end side of the pulsation reduction hose and the pulsation of the pressure oil discharged into the discharge pipe interfere with each other to cancel each other, thereby reducing the pulsation of the pressure oil flowing through the discharge pipe. Has become.

[0008]

However, the pulsation reducing hose according to the prior art described above vibrates with the pulsation of the pressure oil discharged from the hydraulic pump when the hydraulic pump is operated. For this reason, the vibration of the pulsation reducing hose propagates to the turning frame to which the tip side of the pulsation reducing hose is fixed via the bracket, and the cab and the like mounted on the turning frame generate vibration, noise, and the like. There is.

Particularly, in a hydraulic pump device provided with a plurality of hydraulic pumps driven by a prime mover, and each of the hydraulic pumps is connected to a separate hydraulic device via a hydraulic pipe, a discharge port of each hydraulic pump is usually used. The pulsation reduction hoses are connected one by one, and the distal ends of the plurality of pulsation reduction hoses are fixed to the turning frame.

Therefore, when the plurality of hydraulic pumps are driven in synchronization with each other, the revolving frame to which the distal ends of the plurality of pulsation reducing hoses are fixed greatly vibrates due to the superposition of the vibration transmitted from each of the pulsation reducing hoses. However, there is a problem that the ride comfort is reduced for the operator in the cab.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems of the prior art, and can reduce vibration of a hydraulic pipe due to pulsation during operation of a hydraulic pump. It is an object of the present invention to provide a hydraulic pump device capable of suppressing transmission to an object.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a plurality of hydraulic pumps driven by a prime mover, hydraulic pipes respectively connected to the discharge sides of the hydraulic pumps, In order to reduce the pulsation that occurs in the piping, the base end is connected to the discharge side of each of the hydraulic pumps or the middle of the hydraulic piping, and the distal end is closed, and a part of the hydraulic oil discharged from each of the hydraulic pumps is introduced. Applied to a hydraulic pump device comprising a plurality of flexible pulsation reducing hoses.

A feature of the structure adopted by the first aspect of the present invention is that each of the pulsation reduction hoses has a distal end side extending as a free end, and a tip of each of the pulsation reduction hoses is provided between the respective pulsation reduction hoses. That is, a hose restraining member for restraining the side movement is provided.

With this configuration, a part of the pressure oil discharged from each hydraulic pump is introduced into the respective pulsation reducing hose, and is reflected at the closed distal end of the pulsation reducing hose to be reflected at the base end. Returns to the side and merges with the pressure oil discharged into the hydraulic piping. As a result, the pulsation of the pressure oil returned to the base end side of the pulsation reduction hose and the pulsation of the pressure oil discharged into the hydraulic pipe interfere with each other and are offset, thereby reducing the pulsation of the pressure oil flowing through the hydraulic pipe. can do.

At this time, each of the pulsation reducing hoses vibrates due to the pulsation of the pressure oil introduced from the hydraulic pump, but since the leading ends of these pulsation reducing hoses are free ends,
The transmission of the vibration of the pulsation reduction hose to the structure around the hydraulic pump can be suppressed. Further, since the pulsation reducing hoses are mutually restrained by the hose restraining member, it is possible to prevent the distal end side of each pulsation reducing hose from colliding with a surrounding structure or the like.

According to a second aspect of the present invention, the hose restraining member is constituted by an elastic body that elastically restrains the pulsation reducing hoses.

With this configuration, even if, for example, each of the pulsation reducing hoses vibrates so as to repeat displacement in a direction approaching each other and displacement in a direction away from each other,
The hose restraining member can expand and contract following the displacement of the pulsation reducing hose. Therefore, for example, when each pulsation reduction hose is displaced in a direction approaching each other, the hose restraining member is detached from each pulsation reduction hose, or when each pulsation reduction hose is displaced in a direction away from each other, the hose restraining member is It is possible to suppress an excessive force from acting on each pulsation reduction hose restrained by the above.

According to a third aspect of the present invention, the hose restraining member comprises an elastic ring wound between the pulsation reducing hoses.

With this configuration, the pulsation reducing hoses can be restrained from each other by a simple operation of winding the elastic ring between the plurality of pulsation reducing hoses, and the tip of each pulsation reducing hose can be restrained. It is possible to prevent the side from colliding with surrounding structures or the like.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hydraulic pump device according to the present invention will be described below in detail with reference to FIGS.

First, FIGS. 1 to 4 show a first embodiment according to the present invention.
In the drawings, reference numeral 1 denotes a tracked lower traveling body, and the lower traveling body 1 is a traveling hydraulic motor (not shown).
By driving the left and right crawler belts 2 and 2, the hydraulic excavator travels.

An upper revolving unit 3 is mounted on the lower traveling unit 1 so as to be pivotable. The upper revolving unit 3 is connected to a lower traveling unit 4 via a revolving device 4 having a hydraulic motor for turning (not shown). 1
A turning frame 5 provided on the upper side, a cab 6 provided on the front left side of the turning frame 5 to define a driver's cab, and provided on the turning frame 5 behind the cab 6; A building cover 7 defining a machine room for accommodating a motor 9 and a hydraulic pump device 11 to be described later, and a counterweight (not shown) disposed on the revolving frame 5 behind the building cover 7 ).

Reference numeral 8 denotes a working device provided at the center of the front part of the upper swing body 3 so as to be able to move upward and downward. The working device 8 is driven by a plurality of hydraulic cylinders (not shown) to perform excavation work such as earth and sand. Is what you do.

Reference numeral 9 denotes a prime mover disposed inside the building cover 7 and disposed on the revolving frame 5; 10 denotes a power transmission device mounted on the prime mover 9;
Is transmitted to the hydraulic pumps 12, 13 described below.

Numeral 11 denotes a hydraulic pump device located in the building cover 7 and attached to the power transmission device 10. The hydraulic pump device 11 includes hydraulic pumps 12, 13, suction pipes 15, discharge pipes 18, 19. Pulsation reduction hose 21,
3 and the like.

Reference numerals 12 and 13 denote two hydraulic pumps which constitute the hydraulic pump device 11.
Are arranged in a single casing 14 in a horizontal state in which respective rotating shafts are arranged in parallel. The hydraulic pumps 12 and 13 have their rotating shafts connected to a power transmission device 10 via gears and the like, and are driven synchronously by a prime mover 9, so that a hydraulic motor for traveling of the lower traveling body 1 Hydraulic motor for turning of turning device 4, working device 8
Pressure oil is discharged toward each of the hydraulic cylinders and the like.

In the casing 14, a suction port for guiding hydraulic oil to each of the hydraulic pumps 12, 13 and a discharge port (not shown) for discharging hydraulic oil from each of the hydraulic pumps 12, 13 are provided. Is formed.

Reference numeral 15 denotes a suction pipe connecting between suction ports of the hydraulic pumps 12 and 13 and the hydraulic oil tank 16, and a base end of the suction pipe 15 is connected to each of the hydraulic pumps 12 and 13 provided in the casing 14. Of the suction pipe 15 is connected to a hydraulic oil tank 16.
The suction pipe 15 guides hydraulic oil stored in the hydraulic oil tank 16 to suction ports of the hydraulic pumps 12 and 13.

Reference numeral 17 denotes a piping connection block fixed to the outer surface of the casing 14. Two oil passages (not shown) are individually formed in the piping connection block 17, and one of the oil passages is The other oil passage communicates with the discharge port of the hydraulic pump 13. The discharge pipe 18 and the pulsation reducing hose 21
And a discharge pipe 19 and a pulsation reducing hose 23 are connected to the other oil passage.

Reference numeral 18 denotes a discharge pipe on the side of the hydraulic pump 12 for connecting between a discharge port of the hydraulic pump 12 and a control valve group 20 described later. The base end of the discharge pipe 18 is connected to a pipe connection block 17. Then, it communicates with the discharge port of the hydraulic pump 12, and the distal end side of the discharge pipe 18 is connected to the manifold of the control valve group 20.

Reference numeral 19 denotes a discharge pipe on the hydraulic pump 13 side connecting the discharge port of the hydraulic pump 13 and the control valve group 20. The base end of the discharge pipe 19 is connected to the pipe connection block 1
7 and communicates with the discharge port of the hydraulic pump 13;
The distal end side of the discharge pipe 18 is connected to a manifold of the control valve group 20.

Reference numeral 20 denotes a control valve group disposed in the building cover 7 at a position forward of the prime mover 9.
Consists of an assembly of control valves for controlling the supply and discharge of hydraulic oil to various hydraulic actuators such as the hydraulic motor for traveling of the lower traveling body 1, the hydraulic motor for turning of the turning device 4, and the hydraulic cylinders of the working device 8, The manifold of the control valve group 20 includes a discharge pipe 18 on the hydraulic pump 12 side, a hydraulic pump 13
Side discharge pipes 19 are connected respectively.

Then, through the discharge pipe 18, the control valve group 2
The pressure oil from the hydraulic pump 12 supplied to the manifold 0 is supplied to and discharged from a predetermined hydraulic actuator through a hydraulic pipe (not shown) connected to an output port of a control valve constituting the control valve group 20. On the other hand, the hydraulic pump 1 supplied to the manifold of the control valve group 20 through the discharge pipe 19
The pressure oil from 3 is supplied and discharged to another hydraulic actuator through a hydraulic pipe (not shown) connected to an output port of another control valve constituting the control valve group 20. The manifold of the control valve group 20 and the hydraulic oil tank 16 are connected by a return pipe (not shown) for guiding return oil from the hydraulic actuator to the hydraulic oil tank 16.

Reference numeral 21 denotes a pulsation reduction hose connected to the discharge port of the hydraulic pump 12 on the hydraulic pump 12 side. The pulsation reduction hose 21 is formed of a high-pressure rubber hose having flexibility. 1 of pressure oil pulsation
When the ４ wavelength is the basic length, it is formed with a length that is a natural number times the basic length. Here, the pulsation reduction hose 2
1 is connected to a piping connection block 17 and communicates with a discharge port of the hydraulic pump 12 to form a pulsation reducing hose 2.
The first end 21A is closed by a sealing plug 22 and is a free end extending downward from the pipe connection block 17.

The pulsation reducing hose 21 introduces a part of the pressure oil discharged from the hydraulic pump 12, reflects this pressure oil at the closed end of the distal end 21 A, returns it to the base end, and supplies the oil to the discharge pipe 18. Merge with pressure oil to be discharged. Accordingly, the pulsation of the pressure oil returned to the base end side of the pulsation reduction hose 21 and the pulsation of the pressure oil discharged to the discharge pipe 18 interfere with each other and cancel each other, and the pulsation of the pressure oil flowing through the discharge pipe 18 Is reduced.

Reference numeral 23 denotes a pulsation reduction hose connected to the discharge port of the hydraulic pump 13 on the hydraulic pump 13 side. The pulsation reduction hose 23 is formed of a high-pressure rubber hose having flexibility, and discharges from the hydraulic pump 13, for example. 1 of pressure oil pulsation
When the ４ wavelength is the basic length, it is formed with a length that is a natural number times the basic length. Here, the pulsation reduction hose 2
3 is connected to a piping connection block 17 and communicates with a discharge port of a hydraulic pump 13 so that a pulsation reducing hose 2 is connected.
3 has a free end 23A which is closed by a sealing plug 24 and extends downward from the pipe connection block 17.

The pulsation reducing hose 23 introduces a part of the pressure oil discharged from the hydraulic pump 13, reflects the pressure oil at the closed end of the distal end 23 A, returns the oil to the base end, and supplies the oil to the discharge pipe 19. Merge with pressure oil to be discharged. Thereby, the pulsation of the pressure oil returning to the base end 23A of the pulsation reducing hose 23,
The pulsation of the pressure oil discharged to the discharge pipe 19 interferes with each other and is canceled out, so that the pulsation of the pressure oil flowing through the discharge pipe 19 can be reduced.

Reference numeral 25 denotes an elastic ring as a hose restraining member provided between the two pulsation reducing hoses 21 and 23. The elastic ring 25 is formed by connecting a band-like elastic material such as rubber to a ring. Is formed. And
The elastic ring 25 is provided at the distal end 21A of the pulsation reducing hose 21.
And the pulsation reducing hose 23 are wound around the distal end 23A of the pulsation reducing hose 23 with appropriate elasticity.
This restricts the movement of the distal end sides 21A, 23A of 23.

Here, each of the pulsation reducing hoses 21 and 23 is
As shown in FIGS. 3 and 4, the distal ends connected to each other by an elastic ring 25 in a state where the base ends are connected to the piping connection block 17 as shown in FIGS. 21A, 23A
However, it is configured to keep a posture floating in the air away from the turning frame 5, the suction pipe 15, and the like.

Further, since the elastic ring 25 has an appropriate elasticity, even if the pulsation reducing hoses 21 and 23 vibrate so as to repeat the displacement in the direction approaching each other and the displacement in the direction separating from each other, Elastic ring 25
Can expand and contract following the displacement of the pulsation reducing hoses 21 and 23.

For this reason, for example, the pulsation reducing hoses 21 and
When the pulsation reducing hoses 21 and 23 are displaced in the directions in which the pulsation reducing hoses 21 and 23 are displaced in the directions in which the elastic rings 25 contract, the elastic rings 25 contract. Sometimes
By allowing the elastic rings 25 to extend and allow the pulsation reducing hoses 21 and 23 to be displaced, it is possible to suppress an excessive force from acting on the pulsation reducing hoses 21 and 23 restrained by the elastic ring 25.

The elastic ring 25 may be provided, for example, at an intermediate portion of each of the pulsation reducing hoses 21 and 23 in the longitudinal direction.
The elastic ring 25 is preferably provided between the distal ends 21A and 23A of the pulsation reducing hoses 21 and 23 since the maximum is at 23A.

The hydraulic pump device 11 according to the present embodiment has the above-described configuration, and its operation will be described below.

First, when the prime mover 9 operates, each hydraulic pump 1 connected to the prime mover 9 via the power transmission device 10 is operated.
2, 13 are driven synchronously. Thereby, the hydraulic oil in the hydraulic oil tank 16 is sucked into each of the hydraulic pumps 12, 13 through the suction pipe 15, and the hydraulic pumps 12, 13
The sucked hydraulic oil is pressurized and discharged as pulsating pressure oil to each discharge port.

Most of the pressure oil discharged from the hydraulic pump 12 is guided to a control valve group 20 through a discharge pipe 18 and supplied to a predetermined hydraulic actuator via the control valve group 20. On the other hand, most of the pressure oil discharged from the hydraulic pump 13 is guided to the control valve group 20 through the discharge pipe 19 and supplied to other hydraulic actuators via the control valve group 20.

At this time, a part of the pressure oil discharged from the hydraulic pump 12 is introduced into the pulsation reducing hose 21, reflected by the distal end 21 A of the pulsation reducing hose 21, returned to the base end, and returned to the discharge pipe 18. Pulsation of the pressure oil flowing through the discharge pipe 18 can be reduced. On the other hand, a part of the pressure oil discharged from the hydraulic pump 13 is introduced into the pulsation reducing hose 23, reflected by the distal end 23 </ b> A of the pulsation reducing hose 23, returned to the base end, and discharged to the discharge pipe 19. By joining the oil, the pulsation of the pressure oil flowing in the discharge pipe 19 can be reduced.

In this case, the pulsation reducing hose 21 generates vibration when the pressure oil discharged from the hydraulic pump 12 is introduced, and the pulsation reducing hose 23 also generates a vibration when the pressure oil discharged from the hydraulic pump 13 is introduced. Causes vibration.

However, these pulsation reducing hoses 21 and 23
The distal ends 21A and 23A are free ends that are restrained by an elastic ring 25 and do not come into contact with the turning frame 5 or the like. Therefore, each pulsation reducing hose 2
The vibrations of the pulsation reducing hoses 21 and 23 can be reliably prevented from being transmitted to the turning frame 5 and the like, while the vibrations of the pulsation reducing hoses 21 and 23 are suppressed by the elastic force of the elastic ring 25. As a result, it is possible to suppress the cab 6 mounted on the turning frame 5 from generating vibration, noise, and the like, and to improve the riding comfort in the cab 6.

Since the elastic ring 25 has appropriate elasticity, it can expand and contract following the vibration of the pulsation reducing hoses 21 and 23. Therefore, for example, when the pulsation reducing hoses 21 and 23 are displaced in a direction approaching each other due to vibration, the elastic ring 25 is prevented from being detached from the pulsation reducing hoses 21 and 23 due to contraction. , 23 can be reliably restrained. On the other hand, when the pulsation reducing hoses 21 and 23 are displaced in a direction away from each other, the elastic ring 25 is extended to allow the displacement of the pulsation reducing hoses 21 and 23, so that the pulsation reducing hoses 21 and 23 restrained by the elastic ring 25. And the life of the pulsation reducing hoses 21 and 23 can be extended.

Furthermore, the pulsation reducing hoses 21 and 23 can be restrained from each other by a simple operation of winding the elastic ring 25 between the distal ends 21A and 23A of the pulsation reducing hoses 21 and 23. For example, the number of parts can be reduced and the operation can be simplified as compared with a case where the tip end side of each pulsation reducing hose is restricted to the turning frame 5 using a bracket or the like.

Next, FIGS. 5 and 6 show a second embodiment of the present invention.
This embodiment is characterized in that two hydraulic pumps are applied to a vertical tandem type hydraulic pump in which a rotating shaft is arranged in series in a single casing. It is in. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 31 denotes a hydraulic pump applied to the present embodiment instead of the hydraulic pump 11 according to the first embodiment. The hydraulic pump 31 is substantially the same as the hydraulic pump 11 described above. The hydraulic pumps 32, described later,
33, the suction pipe 15, the discharge pipes 18, 19, the pulsation reducing hoses 21, 23 and the like.

Reference numerals 32 and 33 denote two hydraulic pumps constituting the hydraulic pump device 31. These two hydraulic pumps 32 and 33
Are disposed in a single casing 34 in a vertically installed state in which respective rotating shafts are arranged in series. The hydraulic pumps 32, 33 are connected to a power transmission device 10 by a coaxially connected rotary shaft and driven synchronously by a prime mover 9, so that a hydraulic motor for traveling of the lower traveling body 1, The hydraulic oil is discharged to the turning hydraulic motor of the device 4, the hydraulic cylinders of the working device 8, and the like.

Reference numeral 35 denotes a piping connection block on the hydraulic pump 32 side fixed to the outer surface of the casing 34. In the piping connection block 35, two oil passages (not shown) are individually formed. One oil passage communicates with the discharge port of the hydraulic pump 32, and the other oil passage communicates with the discharge port of the hydraulic pump 33. A discharge pipe 18 and a pulsation reducing hose 21 are connected to one oil path, and a discharge pipe 19 and a pulsation reducing hose 23 are connected to the other oil path.

Then, the tip side 2 of the pulsation reducing hose 21
1A and the distal end 23A of the pulsation reducing hose 23,
The elastic ring 25 is wound with appropriate elasticity, and the movement of the distal ends 21A and 23A of the pulsation reducing hoses 21 and 23 is restricted by the elastic ring 25.

The hydraulic pump device 31 according to the present embodiment has the above-described configuration. Also in the present embodiment, the pulsation of the pressure oil discharged from the hydraulic pump 32 to the discharge pipe 18 is reduced by the pulsation reducing hose 21. The pulsation reducing hose 23 can reduce the pulsation of the pressure oil discharged from the hydraulic pump 33 to the discharge pipe 19 by the pulsation reducing hose 23, and also suppresses the transmission of the vibration of the pulsation reducing hoses 21 and 23 to the turning frame 5 and the like. It is possible to improve the riding comfort in the cab 6 mounted above.

Next, FIG. 7 shows a third embodiment according to the present invention. The feature of this embodiment is applied to a hydraulic pump device provided with three hydraulic pumps each having an individual casing. It is in. In the present embodiment,
The same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 41 denotes a hydraulic pump device applied to the present embodiment instead of the hydraulic pump device 11 according to the first embodiment. The hydraulic pump device 41 includes hydraulic pumps 42, 43, 44, suction pipe 45, discharge pipe 49,
50, 51, pulsation reducing hoses 52, 54, 56, and the like.

Reference numerals 42, 43 and 44 denote three hydraulic pumps constituting the hydraulic pump device 41.
Each of 43 and 44 has an individual casing. The hydraulic pumps 42, 43, 44 are mounted on the power transmission device 10 such that their rotating shafts are arranged in parallel, and are driven synchronously by the prime mover 9, so that the traveling hydraulic pressure of the lower traveling body 1 is adjusted. The hydraulic oil is discharged toward the motor, the turning hydraulic motor of the turning device 4, the hydraulic cylinders of the working device 8, and the like.

A suction pipe 45 connects between the hydraulic pumps 42, 43, 44 and the hydraulic oil tank 16. The base end of the suction pipe 45 branches into three branch pipes. Are connected to the suction ports of the hydraulic pumps 42, 43, 44, respectively. Further, the distal end side of the suction pipe 45 is connected to the hydraulic oil tank 16. The suction pipe 45 guides the hydraulic oil stored in the hydraulic oil tank 16 to the suction ports of the hydraulic pumps 42, 43, 44.

Reference numeral 46 denotes a piping connection block provided on the hydraulic pump 42. The piping connection block 46 is connected to a discharge pipe 49 and a pulsation reducing hose 52. Is connected to a discharge port of the hydraulic pump 42 via an oil passage formed in the pipe connection block 46.

Reference numeral 47 denotes a piping connection block provided in the hydraulic pump 43. The piping connection block 47 is connected to a discharge pipe 50 and a pulsation reducing hose 54. Is connected to the discharge port of the hydraulic pump 43 via an oil passage formed in the pipe connection block 47.

Reference numeral 48 denotes a piping connection block provided on the hydraulic pump 44. The piping connection block 48 is connected to a discharge pipe 51 and a pulsation reducing hose 56. Communicates with the discharge port of the hydraulic pump 44 via an oil passage formed in the pipe connection block 48.

Reference numeral 49 denotes a discharge pipe connected to the pipe connection block 46 and the control valve group 20. The discharge pipe 49 connects between the discharge port of the hydraulic pump 42 and the control valve group 20. .

Reference numeral 50 denotes a discharge pipe connected to the pipe connection block 47 and the control valve group 20. The discharge pipe 50 connects between the discharge port of the hydraulic pump 43 and the control valve group 20. .

Reference numeral 51 denotes a discharge pipe connected to the pipe connection block 48 and the control valve group 20. The discharge pipe 51 connects between the discharge port of the hydraulic pump 44 and the control valve group 20. .

Reference numeral 52 denotes a pulsation reducing hose whose base end is connected to a discharge port of the hydraulic pump 42 via a piping connection block 46. The pulsation reducing hose 52 is made of a flexible high-pressure rubber hose. When the base length is a quarter wavelength of the pulsation of the pressure oil discharged from the hydraulic pump 42, the length is formed as a natural number times the base length. The base end of the pulsation reducing hose 52 is connected to a discharge port of the hydraulic pump 42 via a piping connection block 46. Further, the distal end side 52A of the pulsation reducing hose 52 is
Blocked by the sealing plug 53 and the pipe connection block 46
Is a free end that extends downward from.

Reference numeral 54 denotes a pulsation reducing hose whose base end is connected to the discharge port of the hydraulic pump 43 via a piping connection block 47. The pulsation reducing hose 54 is made of a flexible high-pressure rubber hose. When the base length is a quarter wavelength of the pulsation of the pressure oil discharged from the hydraulic pump 43, the length is formed as a natural number times the base length. The base of the pulsation reducing hose 54 is connected to a discharge port of the hydraulic pump 43 via a piping connection block 47. Also, the distal end 54A of the pulsation reducing hose 54 is
Blocked by the sealing plug 55 and the pipe connection block 47
Is a free end that extends downward from.

Reference numeral 56 denotes a pulsation reducing hose whose base end is connected to a discharge port of the hydraulic pump 44 via a piping connection block 48. The pulsation reducing hose 56 is made of a high-pressure rubber hose having flexibility. Assuming that the basic length is ４ wavelength of the pulsation of the pressure oil discharged from the hydraulic pump 44, it is formed to have a length that is a natural number times the basic length. The base end of the pulsation reducing hose 56 is connected to a discharge port of the hydraulic pump 44 via a piping connection block 48. Also, the distal end 56A of the pulsation reducing hose 56 is
Blocked by the sealing plug 57, the pipe connection block 48
Is a free end that extends downward from.

The pulsation reducing hose 52 reduces the pulsation of the pressure oil discharged from the hydraulic pump 42 to the discharge pipe 49, and the pulsation reduction hose 54 controls the pulsation of the pressure oil discharged from the hydraulic pump 43 to the discharge pipe 50. The pulsation reducing hose 56 reduces the pulsation of the pressure oil discharged from the hydraulic pump 44 to the discharge pipe 51.

Reference numeral 58 denotes an elastic ring serving as a hose restraining member provided between the pulsation reducing hoses 52 and 54. The elastic ring 58 is formed by, for example, connecting belt-like rubber in a ring shape. And the elastic ring 58
The pulsation reducing hose 52 is wound with a suitable elasticity between the distal end side 52A of the pulsation reducing hose 52 and the distal end side 54A of the pulsation reducing hose 54.
A, 54A are restricted.

Reference numeral 59 denotes an elastic ring as a hose restraining member provided between the pulsation reducing hoses 54 and 56. The elastic ring 59 is formed by, for example, connecting belt-like rubber in a ring shape. And the elastic ring 59
The pulsation reducing hose 54 is wound with a suitable elasticity between the distal end 54A of the pulsation reducing hose 54 and the distal end 56A of the pulsation reducing hose 56.
A, 56A are restricted.

The hydraulic pump device 41 according to the present embodiment has the above-described configuration, and the pulsation of the pressure oil discharged from the hydraulic pump 42 to the discharge pipe 49 is reduced by a pulsation reducing hose 52.
The pulsation of the pressure oil discharged from the hydraulic pump 43 to the discharge pipe 50 is reduced by the pulsation reduction hose 54, and the pulsation of the pressure oil discharged from the hydraulic pump 44 to the discharge pipe 51 is reduced by the pulsation reduction hose 56. Can be.

At this time, the pulsation reducing hose 52 generates vibration by the introduction of the pressure oil discharged from the hydraulic pump 42, and the pulsation reducing hose 54 generates the vibration by the introduction of the pressure oil discharged from the hydraulic pump 43. Vibration is generated, and the pulsation reducing hose 56 generates vibration when pressure oil discharged from the hydraulic pump 44 is introduced.

However, these pulsation reducing hoses 52, 5
The distal ends 52A, 54A, 56A of the rotary frames 4 and 56 are restrained from each other via elastic rings 58 and 59, and
It is a free end that does not come into contact with etc. Therefore, the vibrations of the pulsation reducing hoses 52, 54, 56 are suppressed by the elastic force of the elastic rings 58, 59, and the vibrations of the pulsation reducing hoses 52, 54, 56 are reduced.
Etc. can be reliably prevented. As a result, it is possible to suppress the cab 6 mounted on the turning frame 5 from generating vibration, noise, and the like, and to improve the riding comfort in the cab 6.

In the above-described first embodiment, a case where the base end sides of the pulsation reducing hoses 21 and 23 are connected to the discharge ports of the hydraulic pumps 12 and 13 via the piping connection block 17 is taken as an example. However, the present invention is not limited to this. For example, the base end of the pulsation reducing hose 21 is connected to the middle of the discharge pipe 18, and the base end of the pulsation reducing hose 23 is connected to the middle of the discharge pipe 19. It may be configured. This is the same for the second and third embodiments.

In the above-described second embodiment, 2
Although the hydraulic pump device 31 in which the individual hydraulic pumps 32 and 33 are incorporated in a single casing 34 has been described as an example, the present invention is not limited to this. For example, two hydraulic pumps having individual casings The present invention can also be applied to a hydraulic pump device provided with

Further, in each of the above-described embodiments, the case where the elastic ring 25 (58, 59) formed by connecting a belt-like rubber in a ring shape is used as an example of the hose restraining member. The hose restraining member may be formed by connecting a coil spring or the like in a ring shape, for example.

Further, in each of the above-described embodiments, the case where the present invention is applied to a hydraulic pump device mounted on a hydraulic excavator has been described as an example. However, the present invention is not limited to this, and for example, a hydraulic crane, a wheel loader, etc. The present invention can be widely applied to hydraulic pump devices mounted on other construction machines and hydraulic pump devices mounted on various industrial machines.

[0080]

As described above in detail, according to the first aspect of the present invention, the distal ends of the plurality of pulsation reducing hoses respectively connected to the discharge sides of the plurality of hydraulic pumps are set as free ends, and each of the pulsation reducing hoses is used. Since a hose restraining member for restraining the movement of the tip of each pulsation reducing hose is provided between the pulsation reducing hoses, the hydraulic piping connected to the discharge side of each hydraulic pump generates vibration caused by the pulsation of the pressure oil, causing the pulsation to decrease. In addition to being able to be reduced by the reduction hose, the vibration generated by each pulsation reduction hose at this time can be suppressed from being transmitted to the structure around the hydraulic pump, and the vibration, noise, etc. of the structure can be reliably reduced. Can be reduced. In addition, since the pulsation reduction hoses are mutually restrained by the hose restraining member, the vibration itself of each pulsation reduction hose can be suppressed, and it is possible to prevent the distal end side of each pulsation reduction hose from colliding with a surrounding structure or the like. Can be suppressed.

According to the second aspect of the present invention, since the hose restraining member is formed of the elastic body which elastically restrains between the pulsation reducing hoses, even if each of the pulsation reducing hoses is displaced by vibration, the hose restraining member can be restrained. The member can expand and contract following the displacement of the pulsation reducing hose. Therefore, for example, when the respective pulsation reducing hoses are displaced in a direction approaching each other, it is possible to suppress the hose restraining member from separating from each of the pulsation reducing hoses, and it is possible to reliably restrain each pulsation reducing hose. . On the other hand, when the pulsation reduction hoses are displaced in the direction away from each other, it is possible to suppress an excessive force from acting on each of the pulsation reduction hoses restrained by the hose restraining member, and to prolong the life of the pulsation reduction hoses. it can.

Further, according to the third aspect of the present invention, since the hose restraining member is constituted by the elastic ring wound between the pulsation reducing hoses, only the elastic ring is wound between the plurality of pulsation reducing hoses. These pulsation reducing hoses can be restrained from each other by the simple work described above.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which a hydraulic pump device according to a first embodiment of the present invention is applied to a hydraulic shovel.

FIG. 2 is a plan view of a hydraulic pump, a suction pipe, a discharge pipe, a pulsation reducing hose, an elastic ring, and the like, as viewed from the direction of arrows II-II in FIG.

FIG. 3 is a side view of a hydraulic pump, a suction pipe, a discharge pipe, a pulsation reducing hose, an elastic ring, and the like, as viewed from a direction indicated by arrows III-III in FIG.

FIG. 4 is an enlarged perspective view showing a hydraulic pump, a suction pipe, a discharge pipe, a pulsation reducing hose, an elastic ring, and the like.

FIG. 5 is a plan view of a hydraulic pump, a suction pipe, a discharge pipe, a pulsation reducing hose, an elastic ring, and the like according to the second embodiment as viewed from the same position as in FIG.

FIG. 6 is a side view of a hydraulic pump, a suction pipe, a discharge pipe, a pulsation reducing hose, an elastic ring, and the like according to the second embodiment as viewed from the same position as in FIG.

FIG. 7 is a side view of a hydraulic pump, a suction pipe, a discharge pipe, a pulsation reducing hose, an elastic ring, and the like according to a third embodiment as viewed from the same position as in FIG.

[Explanation of symbols]

9 Motor 12, 13, 32, 33, 42, 43, 44 Hydraulic pump 18, 19, 49, 50, 51 Discharge piping (hydraulic piping) 21, 23, 52, 54, 56 Pulsation reduction hose 25, 58, 59 Elasticity Ring (Hose restraint member)

Claims (3)

[Claims] A hydraulic pump driven by a prime mover, hydraulic pipes respectively connected to the discharge sides of the hydraulic pumps, and a pulsation generated in the hydraulic pipes are reduced.
The base end is connected to the discharge side of each of the hydraulic pumps or the middle of the hydraulic piping, and the front end is closed,
In a hydraulic pump device comprising a plurality of flexible pulsation reducing hoses into which a part of the pressure oil discharged from each of the hydraulic pumps is introduced, each of the pulsation reducing hoses extends with a distal end side as a free end. A hydraulic pump device having a configuration, wherein a hose restraining member is provided between each of the pulsation reducing hoses to restrain movement of the tip of each of the pulsation reducing hoses. 2. The hydraulic pump device according to claim 1, wherein the hose restraining member is formed of an elastic body that elastically restrains the pulsation reducing hoses. 3. The hydraulic pump device according to claim 1, wherein the hose restraining member is formed of an elastic ring wound between the pulsation reducing hoses.