JP4583999B2 - Joint fixing device for construction machinery - Google Patents

Description

  The present invention relates to a joint fixing device used for hydraulic piping of construction machinery.

  Conventional construction machines such as hydraulic excavators use many hydraulic pipes. Among these hydraulic pipes, for example, a pipe described in Patent Document 1 is a relatively low pressure and high flow rate hydraulic pipe. A connecting device (joint) is used.

In the joint described in Patent Document 1, an annular groove is formed on the outer periphery of the end of the pipe to be connected, and an annular protrusion is formed on the inner circumferential surface of the annular groove by an elastic body such as rubber. It has a configuration in which the annular projection of the provided seal ring is fitted.
In addition, each seal ring is fitted in a diameter-enlarged opening formed at both ends of the sleeve, and each tube body is liquid-tightly connected by the sleeve, and on the outer periphery of the diameter-enlarged opening, The clamp ring divided into two in the radial direction is fitted, and the diameter of the diameter-enlarged opening of the sleeve is reduced by tightening between the ends of each clamp ring with a fixing tool such as a bolt. .
As a result, the inner peripheral surface of the seal ring is crimped to the outer peripheral surface of the pipe by the clamp ring, so that the seal between the pipe and the sleeve can be surely performed, and at the same time, the joint is connected to the pipe by the annular protrusion fitted in the annular groove. It can be prevented from coming off more.

On the other hand, among the hydraulic pipes of construction machinery, there is a return pipe that returns the hydraulic oil that has driven the actuator to the hydraulic oil tank as a low-pressure hydraulic pipe having a high flow rate.
An oil cooler that cools the hydraulic oil that has become hot by driving the actuator is installed in the middle of the return pipe of the hydraulic oil. The described joint is used, and as a pipe fixing device for fixing the pipe connected by the joint to the vehicle body, for example, one described in Patent Document 2 is known.

In the pipe fixing device described in Patent Document 2, a curved portion that sandwiches a pipe that is fixed to a pedestal is formed on one end side, and is formed of a pressing plate having a bolt insertion hole drilled on the other end side. The inserted bolt is screwed into the pedestal and the piping is fixed between the curved portion and the pedestal so that the piping is fixed to the pedestal. The pedestal is located near the joint connecting the piping and the oil cooler. It is comprised so that piping may be fixed to.
JP 2002-349777 A JP 2002-294744 A

However, like the joint described in Patent Document 1, the annular protrusion formed on the inner surface of the seal ring is fitted into the annular groove formed on the outer peripheral surface of the tube so that the joint is detached from the pipe. If the vibration is applied to the pipe for a long time , the annular protrusion may be damaged or deteriorated, the joint may come off from the pipe, or oil leakage may occur. Since it is necessary to project an annular protrusion on the inner peripheral surface of the ring or to form an annular groove on the outer peripheral surface of the pipe, there are also problems such as high component costs and processing costs.

  On the other hand, in the pipe fixing device described in Patent Document 2, the press plate is used to fix the pipe to the base in the vicinity of the joint, thereby preventing the joint from coming off the pipe by the press plate. If the pipe is not fixed in the vicinity of the joint, it will not be possible to prevent the joint from coming off.Therefore, there are other members around the pipe, and it cannot be applied to places where the pipe cannot be fixed near the joint. In addition to the problem of receiving, there is also a problem that the cost increases due to an increase in the number of parts because a presser plate, a fixing tool and the like are separately required.

  The present invention has been made to remedy such a problem, and an object of the present invention is to provide a joint fixing device for a construction machine that can reliably prevent the joint from coming off the pipe with a small number of parts.

  A joint fixing device for a construction machine according to the present invention is a joint fixing device for a construction machine that prevents a joint provided at a connecting portion of a hydraulic pipe through which pressure oil flows from coming out of the pipe. A main part provided along one end of the main part, a stopper projecting from one end of the main part and contacting the end of the joint to prevent the joint from coming out of one pipe, It is comprised from the attachment part provided in the end side, and attached to the attachment seat provided in one piping so that attachment or detachment was possible by the fixing tool.

With the above configuration, even if vibration is applied to the pipe for a long time , the stopper and mounting seat prevent the joint from moving, so the joint does not come off from the pipe and the pipe is fixed to the vehicle body near the joint. Since there is another member around the pipe and the pipe cannot be fixed to the vehicle body side, it is possible to connect the pipe with a joint, which greatly increases the degree of freedom of the pipe. Piping design and construction become easy.
In addition, there is no need to project an annular protrusion on the inner peripheral surface of the joint seal ring or to form an annular groove on the outer peripheral surface of the pipe. Since the fixing device can be configured, the cost of the entire pipe can be reduced.

  In the joint fixing device for a construction machine according to the present invention, a stopper portion is provided on the attachment portion side of the main portion so as to prevent the joint from coming out from the other side of the pipe by contacting the end portion of the joint.

  With the above configuration, the mounting seat can be installed at a position away from the connection end of the pipe. The prevention effect is not impaired.

  In the joint fixing device for a construction machine according to the present invention, the attachment portion is provided with a locking portion for preventing the main portion from rotating around the fixing tool.

  With the above-described configuration, the main part does not rotate even if the fastening of the fastening tool is incomplete or the fastening tool is loosened due to vibration or the like.

  The joint fixing device for a construction machine according to the present invention is a self-propelled traveling body, a revolving body provided on the traveling body so as to be able to swivel, an engine room installed at a rear portion of the revolving body, and an engine room. A joint fixing device for a construction machine, comprising: an oil cooler, a return pipe for flowing hydraulic oil into and out of the oil cooler, and a joint connecting the return pipe and a pipe projecting from the oil cooler. A main portion provided along the pipe, a stopper projecting from one end of the main portion, and contacting the end of the joint to prevent the joint from coming out of one of the pipes; A mounting portion provided on the other end side of the mounting portion and detachably attached to the mounting seat provided on one of the pipes by a fixing tool, projecting on the mounting portion side, and contacting the end of the joint. The other pipe by touching Those constructed from a stopper portion for preventing the joint get out.

With the above configuration, the joint does not come off from the pipe even if the pipe is subjected to vibration for a long period of time , and there is no need to fix the pipe to the vehicle body near the joint, so there are other members around the pipe. Therefore, it is possible to connect pipes with joints even in places where the pipes cannot be fixed to the vehicle body side, which greatly increases the degree of freedom of piping, making it easier to design and install hydraulic pipes and seal the joints. Since there is no need to project an annular protrusion on the inner peripheral surface of the ring or to form an annular groove on the outer peripheral surface of the pipe, there is no increase in parts costs and processing costs, and the joint fixing device is configured with a small number of parts. As a result, the cost of the entire hydraulic piping can be reduced.
In addition, since the stopper part that prevents the joint from coming out from the other side of the pipe protrudes on the attachment part side of the main part, the mounting seat can be installed at a position away from the connection end of the pipe. Even if there is some dimensional error in the installation position of the mounting seat, the joint cannot be attached or the joint prevention effect is not impaired, and the main part rotates around the fixing tool at the mounting part. Since a locking part is provided to prevent this, the main part does not rotate even if the fixing tool is not fully tightened or the fixing tool is loosened due to vibration, etc. The effect is not impaired.

  According to the joint fixing device for a construction machine of the present invention, since the degree of freedom of piping is greatly increased, the design and construction of hydraulic piping is facilitated, and the joint fixing device can be configured with a small number of parts. Cost reduction.

An embodiment in which the present invention is implemented in a hydraulic excavator will be described in detail with reference to the drawings.
1 is a side view of a hydraulic excavator, FIG. 2 is a perspective view of the vicinity of the engine compartment, FIG. 3 is an enlarged cross-sectional view of the joint, FIG. 4 is an arrow view from the direction A in FIG. FIG. 6 is an enlarged sectional view taken along line CC of FIG.

The hydraulic excavator shown in FIG. 1 includes a traveling body 1 that is capable of self-propelling and a revolving body 2 that is rotatably disposed on the traveling body 1.
The traveling body 1 has a track frame 3 including a center frame 3a and a pair of side frames 3b provided on both sides of the center frame 3a. An idler 4 is provided at one end of each side frame 3b. A sprocket 6 that is supported by a traveling motor 5 that is a hydraulic motor is provided on the other end side.
An endless crawler belt 7 is provided between the idler 4 and the sprocket 6, and the crawler belt 7 is driven by the sprocket 6 so that the traveling body 1 can self-propel and the side frame 3b. A plurality of rolling wheels 8 are rotatably supported on the upper and lower portions.
The revolving unit 2 that is installed on the center frame 3 a of the track frame 3 so as to be able to swivel has a bottom portion constituted by a vehicle body 10 frame, and a work machine 11 is mounted on the front portion of the vehicle body frame 10.

As shown in FIG. 1, the work machine 11 has a base end pivotally attached to the front portion of the body frame 10 and a boom 12 that can be raised and lowered by a boom cylinder 13, and a base end side pivotally attached to the tip end of the boom 12. The arm 15 is configured to be rotatable by an arm cylinder 14 and a bucket 17 pivotally attached to the tip of the arm 15 and rotatable by a bucket cylinder 16.
A driver's cab 18 is installed at the front of the vehicle body frame 10 on the side of the work machine 11, and an engine compartment 19 is installed at the rear of the vehicle body frame 10. The counterweight 20 is attached to.
The engine chamber 19 has a substantially sealed structure in which the front and rear are covered with a front cover 21b and a rear cover 21c, both side surfaces are covered with side covers 21a, and the upper surface is covered with an upper cover 21d. , A power engine, a hydraulic pump driven by the engine, and various engine auxiliary machines (both not shown) are installed, and one of the side covers 21a that covers both side surfaces of the engine chamber 19 so as to be freely opened and closed is An intake port 22 made up of a large number of slits is opened at the top.

A cooling fan (not shown) that is rotationally driven by the engine is provided at a position facing the inner surface of the side cover 21a provided with the intake port 22, and as the cooling fan rotates, the side cover 21a External air is sucked into the engine compartment 19 through the intake port 22 opened at the top, and between the side cover 21a and the cooling fan, the oil cooler 24 and the radiator are located close to the cooling fan side. 25. An upper frame 23a and a lower frame 23b for attaching the intercooler 26 are installed apart from each other in the vertical direction.
As shown in FIG. 2, both ends of the upper frame 23a are fixed to the front cover 21b and the rear cover 21c of the engine compartment 19, and the lower frame 23b is fixed to the vehicle body frame 10, so that the upper frame 23a and the lower frame 23b Between them, the oil cooler 24, the radiator 25, and the intercooler 26 are attached in a straight line in a direction perpendicular to a line connecting the intake port 22 and the exhaust port (not shown).

The oil cooler 24 cools the hydraulic oil that has become high temperature by driving the working machine 11 and the like, and is installed in the middle of the hydraulic oil return pipe 27. The hydraulic oil cooled by the oil cooler 24 is A return pipe connected to the upper front portion of the oil cooler 24 is returned to a hydraulic oil tank (both not shown).
The radiator 25 radiates cooling water for cooling the engine, and is connected to an engine cooling system (not shown). The intercooler 26 is connected to a cooling system (not shown) for cooling intake air taken into the engine. ing.
The return pipe 27 for hydraulic oil uses a relatively large diameter steel pipe, for example, a φ42 steel pipe, so that a large amount of hydraulic oil can flow at one time. The hydraulic oil discharged from a control valve (not shown) is supplied to the oil cooler 24. A joint 30 is connected between the return pipe 27 and a pipe 28 serving as a hydraulic oil inlet projecting from the front lower part of the oil cooler 24.

The joint 30 comprises a flexible coupling that can connect both pipes by absorbing these misalignments even if there is some misalignment in the pipes to be connected to each other, and the return pipe 27 to be connected as shown in FIG. A cylindrical ring having a seal ring 31 that can be fitted to the outer peripheral surface of the end portion of the pipe 28 projecting from the lower front surface of the oil cooler 24, and an enlarged diameter portion 32a that can be fitted to the seal ring 31 on both ends. The sleeve 32, the retainer 32b, the enlarged diameter portion 32a of the sleeve 32, and the clamp 33 that presses the retainer 32b against the seal ring 32 from the outside.
The seal ring 31 is formed in an annular shape by an elastic body such as rubber, and has an inner diameter slightly smaller than the outer diameter of the pipes 27 and 28 to be connected.
The sleeve 32 is formed of a metal in a substantially barrel shape with a slightly large central portion. The sleeve 32 is provided with an enlarged diameter portion 32a that can abut on the outer periphery of the seal ring 31 at both ends, and the retainer 32b is a seal ring 31. The enlarged diameter portion 32 a and the retainer 32 b can come into contact with the outer peripheral surface of the seal ring 31.
The clamp 33 is formed by a clamp ring 33a that is divided into two in the circumferential direction. At both ends of the clamp ring 33a, attachment holes 33b through which a fixing tool 34 such as a bolt is inserted are formed. In a state where the ring 33a is fitted to the outer periphery of the enlarged diameter portion 32a of the sleeve 32 and the retainer 32b, the fixing tool 34 inserted into the attachment hole 33b is tightened, whereby the seal ring 31 is interposed via the enlarged diameter portion 32a and the retainer 32b. The inner peripheral surface can be pressed against the outer peripheral surfaces of the pipes 27 and 28.

On the other hand, the joint 30 is provided with a joint fixing device 35 that prevents the joint 30 from coming off from the pipes 27 and 28.
As shown in FIGS. 4 to 6, the joint fixing device 35 includes a plate-like main portion 35a substantially parallel to the axis of the pipes 27 and 28 to be connected, and a pair of protrusions projecting from both ends of the main portion 35a. It consists of stopper portions 35b and 35c and is integrally formed of metal.
The main portion 35a is formed in a rectangular shape as shown in FIG. 4, and a stopper portion 35b that bends substantially perpendicularly to the main portion 35a is provided on one end side.
The distal end side of the stopper portion 35 b protrudes toward the pipe 28 so as to be close to one end face of the joint 30. When the joint 30 moves in the direction of the pipe 28, the stopper portion 35 b comes into contact with the end face of the joint 30. The joint 30 is prevented from moving further to the pipe 28 side.
The other end side of the main portion 35a is an attachment portion 35d, and an attachment hole 35e through which the fixing tool 36 such as a bolt is inserted is formed in the attachment portion 35d, and is closer to the stopper portion 35b side than the attachment portion 35d. A stopper portion 35c is projected at the above position.

The stopper portion 35c is projected so as to be substantially parallel to the same direction as the stopper portion 35b, and the interval between the stopper portions 35b and 35c is slightly larger than the total length of the joint 30, and the joint 30 is directed to the pipe 27 side. When it moves, it contacts the end surface of the joint 30 to prevent the joint 30 from moving further toward the pipe 27 side.
Further, on the outer peripheral surface of the pipe 27, when the stopper portions 35b and 35c are positioned on both end sides of the joint 30, mounting seats 37 project from positions that match the mounting holes 35e of the mounting portion 35d.
As shown in FIG. 6, the mounting seat 37 includes a seat portion 37 a formed in a substantially U shape and a nut 37 b fixed to the back surface of the seat portion 37 a, and the open end of the seat portion 37 a is the outer periphery of the pipe 27. The joint fixing device 35 can be fixed to the mounting seat 37 by screwing the fixing tool 36, which is fixed to the surface and inserted into the mounting hole 35e of the mounting portion 35b, into the nut 37b. The main portion 35a can be locked from rotating around the fixing tool 36 by bringing a locking portion 35f projecting from the mounting portion 35d into contact with one end face of 37.

Next, the operation of the constructed joint fixing device for a construction machine will be described.
Many of the hydraulic pipes piped to construction machinery are piped without passing through the engine room 19 to prevent a fire from occurring when an oil leak occurs. After passing through the front wall 21 b of the engine chamber 19, the pipe is connected to the lower part of the front surface of the oil cooler 24 through the front surface side of the oil cooler 24.
The return pipe 27 and the pipe 28 projecting from the lower front surface of the oil cooler 26 are connected by a joint 30. The joint 30 is connected to the pipes 27, 28 by the clamp 33 on the inner peripheral surface of the seal ring 31. When the pipes 27 and 28 are subjected to vibration for a long period of time , the joint 30 comes off from the pipes 27 and 28 and causes oil leakage.

In order to prevent this, the fixing tool 36 inserted into the mounting hole 35e of the mounting portion 35d is inserted into the mounting seat 37 so that both ends of the joint 30 are sandwiched between the stopper portions 35b and 35c projecting from the main portion 35a. The mounting portion 35d35 is fixed to the mounting seat 37 by screwing into the nut 37b.
This prevents the joint 30 from moving by the stopper portions 35b and 35c even if vibrations or the like act on the pipes 27 and 28 for a long period of time, so that the joint 30 can be reliably prevented from coming off from the pipes 27 and 28. Become.
Further, the locking portion 35f protruding from the mounting portion 35d is locked to the end surface of the mounting seat 37, and the main portion 35a does not rotate around the fixing tool 36. Therefore, the piping 27, Thus, it is possible to prevent the joint 30 from coming off from 28.

In the embodiment described above, the pair of stopper portions 35b and 35c are projected from the main portion 35a. However, as in the modification shown in FIG. 7, the stopper portion 35b is provided only on one end side of the main portion 35a, The stopper 30b may prevent the joint 30 from moving to the 28 side, and the mounting seat 37 may prevent the joint 30 from moving to the pipe 27 side. A stopper pin (both not shown) may be fitted and inserted into the pin holes drilled in the seat 37 and the mounting portion 35e to prevent the main portion 35a from rotating around the fixing tool 36.
Further, substantially semicircular cutouts slightly larger than the outer diameters of the pipes 27 and 28 are formed at the tip ends of the stopper parts 35b and 35c, so that the stopper parts 35b and 35c are bifurcated, and these cutouts are formed in the pipes 27 and 28. The fitting 30 may be prevented from moving by being fitted, and in this case, the locking portion 35f for preventing the main portion 35a from rotating around the fixing tool 36 is not necessary.

  Furthermore, although the said embodiment demonstrated the example applied to the piping of the oil cooler 24 of the parallel arrangement | positioning which arrange | positioned the oil cooler 24, the radiator 25, and the intercooler 26 on the straight line in the direction orthogonal to the flow direction of air, Needless to say, the present invention can be applied to the pipe of the oil cooler 24 in the serial arrangement in which the cooler 24, the radiator 25, and the intercooler 26 are stacked in the air flow direction, and the joint 30 provided in the return pipe 27 for the hydraulic oil of the excavator. In addition, the present invention can be applied to general hydraulic piping of construction machinery in which a joint 30 made of a flexible coupling is used.

It is a side view of the construction machine which employ | adopted the joint fixing device which becomes embodiment of this invention. It is a perspective view of the engine room vicinity of the construction machine which employ | adopted the joint fixing device which becomes embodiment of this invention. It is an expanded sectional view of the joint fixed with the joint fixing device of the construction machine which becomes embodiment of this invention. It is an arrow view from the A direction of FIG. It is an arrow view from the B direction of FIG. It is an expanded sectional view which follows the CC line of FIG. It is a top view which shows the modification of the joint fixing device of the construction machine which becomes embodiment of this invention.

Explanation of symbols

1 traveling body 2 revolving body 19 engine room 24 oil cooler 27 piping (return piping)
28 Piping 30 Joint 35a Main part 35b Stopper part 35c Stopper part 35d Mounting part 35f Locking part 36 Fastening tool 37 Mounting seat

Claims (4)

  A joint fixing device for a construction machine that prevents a joint provided at a connection portion of a hydraulic pipe through which pressure oil flows from the pipe, and a main part provided along the pipe connected by the joint; A stopper that protrudes from one end of the main part and contacts the end of the joint, thereby preventing the joint from coming out of one of the pipes; and provided at the other end of the main part. And a joint fixing device for a construction machine, wherein the joint fixing device is detachably attached to a mounting seat provided on one of the pipes by a fixing tool.   2. The construction machine according to claim 1, wherein a stopper portion is provided on the attachment portion side of the main portion so as to protrude from the other pipe so as to contact the end portion of the joint, thereby preventing the joint from coming out. Joint fixing device.   The joint fixing device for a construction machine according to claim 1 or 2, wherein the attachment portion is provided with a locking portion that prevents the main portion from rotating around the fixing tool. A self-propelled traveling body, a revolving body provided on the traveling body so as to be able to swivel, an engine chamber installed at the rear of the revolving body, an oil cooler installed in the engine chamber, and hydraulic oil. A joint fixing device for a construction machine, comprising: a return pipe that flows into and out of the oil cooler; and a joint that connects the return pipe and a pipe projecting from the oil cooler, the pipe being connected by the joint A stopper portion that prevents the joint from coming out of one of the pipes by projecting on one end side of the main portion and contacting the end of the joint; A mounting portion provided on the other end side of the main portion and detachably attached to a mounting seat provided on one of the pipes by a fixing tool; and projecting on the mounting portion side; and the joint At the end of The other of said joint fixing system for a construction machine characterized by comprising a stopper portion for preventing from the joint slipping out pipe by contact.

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