JP2002348913A - Assembling tool of center joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool for assembling a center joint having simple constitution, carried to a job site using a construction machine to replace a sealing material, and capable of assembling a center joint with suitable force without damaging the sealing material. SOLUTION: This assembling tool is provided with a frame 13 formed by a base 14, side frames 15 and an upper frame 16. The upper frame 16 is provided with a female screw part 24. A screw rod 26 is screwed through the female screw part 24. An operating part 27 for rotation is provided on the upper part of the screw rod 26. A receiving plate 32 is placed on the top face of the center joint 3 to be assembled. The center joint 3 shallow-engaged before assembling is placed on the base 14, and the receiving plate 32 is placed thereon. The screw rod 26 engaged with the female screw part 24 is turned to push down the center joint 3 through the receiving plate 32 to engage a spindle 5 with a body 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for assembling a center joint which is a fluid coupling used in construction machines such as a hydraulic excavator and a crane.

[0002]

2. Description of the Related Art A construction machine such as a hydraulic shovel or a crane is constructed by installing a revolving body on a crawler type or wheel type traveling body via a revolving device, and attaching a work attachment to the revolving body. And in order to supply hydraulic oil from a hydraulic power unit mounted on the revolving structure to the traveling hydraulic motor of the traveling structure,
A center joint, which is a fluid coupling, is installed at the center of the turning device.

[0003] Such a center joint has a structure in which an inner spindle and an outer tubular body are fitted and combined, and is formed in a plurality of grooves provided on the outer periphery of the spindle with a vertical interval. Each of the oil passages is divided by fitting a rubber seal material. Such a sealing material deteriorates in the sealing function with the elapse of the use period, and thus needs to be replaced. In this replacement work, when the body is newly fitted to the spindle, it is difficult to manually fit the body due to the fitting resistance of the seal material. For this reason, a press-fitting device equipped with a hydraulic cylinder is provided in the factory, and the construction machine is transported to the factory to replace the sealing material.

[0004]

As described above, the conventional apparatus for fitting a center joint is of an installation type equipped with a hydraulic cylinder and is installed in a factory. In order to replace the seal material, it is necessary to carry the construction machine to the factory and perform the work, and there is a problem that transportation cost and time are required.

Further, in the case of a hydraulic device, there is a problem that the sealing material is damaged if the sealing material is turned up at the time of the fitting operation because the pressure input is large.

SUMMARY OF THE INVENTION In view of the above problems, the present invention has a simple configuration, and it is possible to carry a construction machine to a site or the like to replace a seal material, and to damage the seal material with an appropriate force. An object of the present invention is to provide a jig capable of assembling a center joint without causing the jig.

[0007]

A jig for assembling a center joint according to claim 1 is a jig for assembling a center joint in which an inner spindle and an outer body are fitted and assembled. A frame body made of a frame, a female screw portion provided in the upper frame, a screw rod that is screwed through the female screw portion, and has an operating portion for rotation at an upper portion,
A receiving plate placed on the upper surface of the center joint to be combined, a spindle or body of the center joint fitted shallowly before assembly is mounted on the base, and the receiving plate is placed on the body or spindle of the center joint. The screw rod screwed into the female screw portion is turned to push down the body or the spindle via the receiving plate to fit the spindle.

As described above, if the body (or the spindle) is pressed down and fitted to the spindle (or the body) by rotating the screw rod by manual power, the manual power is converted into a suitable pressing force by the assembling jig. The two can be fitted with appropriate force and speed without being pushed by an excessively large force as in the case of hydraulic pressure, and if there is a problem, the pushing down work can be easily stopped. Therefore, damage to the sealing material can be prevented.

Further, since the fitting is performed by using human power, a simple and portable structure that can be disassembled and assembled without requiring a hydraulic pressure source can be provided. In this case, the user can carry the assembly jig to exchange the seal material, thereby reducing transportation costs and time.

A center joint assembling jig according to a second aspect is characterized in that, in the first aspect, a pressing block is attached to a lower end of the screw rod so as to be tiltable in all directions.

By providing such a pressing block, the pressing surface of the screw rod can be inclined in all directions in accordance with the inclination of the portion to be pressed. Is prevented, the pressing surface can be evenly applied to the pressed portion, and the misalignment between the spindle and the body can be prevented. As a result, damage to the sealing material and the assembly jig can be prevented. Can be.

According to a third aspect of the present invention, there is provided the center joint assembling jig according to the first or second aspect, wherein a rotary bearing is provided between the receiving plate and the screw rod.

As described above, by providing the rotary bearing between the receiving plate and the screw rod, a smooth fitting operation can be performed without applying a torsional force to the receiving plate by the screw rod.

According to a fourth aspect of the present invention, there is provided a center joint assembling jig according to any one of the first to third aspects, wherein the base is provided with positioning means for the body or the spindle.

As described above, by providing the positioning means on the base, the center joint can be set to the center position, which can contribute to the smooth fitting operation of the center joint.

[0016]

FIG. 1A is a perspective view showing an example of an installation location of a center joint of a construction machine using an assembly jig according to the present invention. Track frame 2 of traveling body 1
, A turning device 3 is installed, and a center joint 3 is installed at the center thereof. The center joint 3 is an oil passage between a hydraulic power unit (not shown) on the revolving unit and a hydraulic cylinder (not shown) for moving the front and rear hydraulic motors 4 and driven wheels of the traveling unit 1 back and forth. Is for connecting.

FIG. 1B is an exploded perspective view of the center joint 3. Spindle 5 inside center joint 3
Openings 7 are provided at different heights on the side surfaces of the plurality of ports 6 respectively connected to the hydraulic piping via internal oil passages, and grooves 8 are provided above and below each opening 7. Are provided, and a sealing material 9 is fitted into each groove 8.

On the other hand, the outer cylindrical body 10 is provided with a port 11 for connecting an external pipe at a height corresponding to the opening 7 of the spindle 5.

When the use period of the center joint 3 elapses, the seal material 9 is worn, and the body 10 and the spindle 5 are worn.
Can be easily separated from each other, but when a new sealing material 9 is attached to the spindle 5, it is difficult to fit them both manually.

FIG. 2 is a perspective view showing an embodiment of a center joint assembling jig according to the present invention, and FIG. 3 is a front view showing a state where the center joint is being assembled using the assembling jig. . In FIGS. 2 and 3, reference numeral 13 denotes a frame, and the frame 13 includes a base 14, side frames 15, and an upper frame 16. The lower end of the side frame 15 is fitted to a U-shaped bracket 17 fixed to the left and right sides of the base 14 by welding.
It is fastened by bolts 18 and nuts 19 and is detachably attached. As a means for positioning the spindle 5, a plate 20 having a semicircular positioning portion 20a for fitting the spindle 5 is fixed to the base 14.

The upper frame 16 comprises a top plate 16a and side plate portions 16b on both sides thereof. Pins 23 are provided in a plurality of holes provided in the upper portion of the side frame 15 and at corresponding positions of the side plate portion 16b. By inserting the upper frame 16 into the left and right side frames 1
5 is removably mounted between the upper ends of the five.

A female screw 24 is provided at the center of the top plate 16a of the upper frame 16. In the present embodiment,
The female screw portion 24 is formed by welding a female screw cylinder.

Reference numeral 26 denotes a screw rod which is screwed through the female screw portion 24. An operating portion 27 such as a hexagonal portion is provided at the upper end of the screw rod 26. The operation unit 27 of the present embodiment is for mounting a rotation tool such as a ratchet wrench to rotate the screw rod 26. In addition, as the operation unit, an operation rod may be detachably or fixedly provided.

The lower part of the screw rod 26 has a spherical part 2
The pressing block 30 is tiltable in all directions through the pressing block 30.
Is installed. Reference numeral 32 denotes a receiving plate mounted on the upper surface of the center joint 3 to be combined.
Has a concave portion 35 for fitting.

When assembling the spindle 5 using this assembling jig, the screw rod 26 is raised and the outer periphery of the lower portion of the spindle 5 on which a new sealing material 9 is attached to the positioning portion 20 a on the base 14. Mating and positioning,
The body 10 is set thereon by fitting its lower part to the upper part of the spindle 5. In this case, the lower side of the body 10 is locked by the uppermost sealing material 9 to prevent the body 10 from falling.

In this state, the receiving plate 32 is concentrically placed on the body 10, a bearing 34 is fitted into the concave portion 35 of the receiving plate 32, and a ratchet wrench or the like is attached to the operating portion 27 of the screw rod 26, and the screw rod 26 is mounted. Turn to lower direction and press block 3
0 is brought into contact with the bearing 34. FIG. 3 shows the state at this time. Further, by pushing down the receiving plate 32 and the body 10 through the screw rod 26, the body 10 is fitted to the spindle 5 to the final fitting position.

As described above, if a configuration is used in which the human power is converted into a pressing force by the screw rod 26 and the body 10 is pressed down and fitted to the spindle 5, it is pushed in with an excessively strong force as in the case of hydraulic pressure. Without any trouble, the fitting is performed with an appropriate force and speed, and in the case of a failure, the pressing-down operation can be easily interrupted, so that damage to the sealing material can be prevented.

Also, the spindle 5 and the body 10 are fitted by using human power, so that a simple and portable configuration that does not require a hydraulic pressure source and can be disassembled and assembled as shown in the embodiment is provided. The sealing jig can be exchanged by carrying the assembly jig to a work site or a user's construction machine storage location, thereby reducing transportation costs and time.

Further, if the pressing block 30 is provided at the lower end of the screw rod 26 via the spherical portion 29 as in the present embodiment, the pressing surface of the screw rod 26 can be omnidirectional in accordance with the inclination of the pressed portion. To prevent the screw rod 26 from hitting at the time of pushing down in the spindle assembly, the pressing surface can be evenly applied to the pressed portion, and the misalignment between the spindle 5 and the body 10 can be prevented. As a result, damage to the sealing material and damage to the assembly jig can be prevented.

Further, by providing the rotary bearing 34 between the screw rod 26 and the receiving plate 32 as in the present embodiment, a smooth torsion force is not exerted on the receiving plate 32 by the screw rod 26, and the rotation is carried out smoothly. The fitting operation can be performed.

Also, as in the present embodiment, the base 14
By providing the positioning means such as the plate 20 having the positioning portion 20a to the center joint, the center joint 3 can be set to the center position, which can contribute to smooth fitting work of the center joint 3.

In practicing the present invention, the assembly jig may be configured so that the body 10 is fitted so that the spindle 5 faces upward.

[0033]

According to the first aspect of the present invention, since the center joint is assembled by converting the human power into the pressing force by the screw rod of the assembling jig, it is pushed in with an excessively strong force as in the case of hydraulic pressure. Without these, the fitting is performed with an appropriate force and speed, and if there is a problem, the pressing operation can be easily stopped, so that damage to the sealing material can be prevented.

Also, since the fitting is performed by using human power, a simple and portable structure that can be disassembled and assembled without requiring a hydraulic source can be provided. The sealing jig can be exchanged by carrying the assembly jig, thereby reducing transportation costs and time.

According to the second aspect of the present invention, since the pressing block capable of tilting in all directions is provided, the pressing surface of the screw rod can be tilted in all directions in accordance with the tilt of the portion to be pressed. In this case, the screw rod is prevented from coming into contact with each other, the pressing surface can be evenly applied to the pressed portion, and the misalignment between the spindle and the body can be prevented. Damage to the assembly jig can be prevented.

According to the third aspect, since the rotary bearing is provided between the receiving plate and the screw rod, a smooth fitting operation can be performed without applying a torsional force to the receiving plate by the screw rod.

According to the fourth aspect, since the positioning means is provided on the base, the center joint can be set at the center position, which can contribute to the smooth fitting operation of the center joint.

[Brief description of the drawings]

FIG. 1A is a perspective view showing an example of an installation position of a center joint of a construction machine using an assembly jig according to the present invention, and FIG. 1B is an exploded perspective view of the center joint of the present example.

FIG. 2 is a perspective view showing an embodiment of the jig of the present invention.

FIG. 3 is a front view showing an assembly operation state of the spindle according to the embodiment.

[Explanation of symbols]

1: running body, 2: track frame, 3: center joint, 4: hydraulic motor, 5: spindle, 6: port,
7: opening, 8: groove, 9: sealing material, 10: body, 1
1: Port, 13: Frame, 14: Base, 15: Side frame,
16: upper frame, 17: bracket, 18: bolt, 19:
Nut, 20: plate, 20a: positioning part, 23:
Pin, 24: female screw portion, 26: screw rod, 27: operating portion, 29: spherical portion, 30: pressing block, 32: receiving plate,
34: bearing, 35: recess

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Mikiya Murakami 2-5-1 Koraku, Bunkyo-ku, Tokyo F-term in Hitachi Construction Machinery Co., Ltd. (reference) 2D015 BA03

Claims (4)

[Claims] 1. A center joint assembling jig for fitting an inner spindle and an outer body by fitting them together, comprising: a frame body comprising a base, a side frame and an upper frame; and a female screw portion provided on the upper frame. A screw rod which is screwed through the female screw portion and has an operating portion for rotation at the top thereof; and a receiving plate placed on the upper surface of a center joint to be combined, and which is shallowly fitted to the base before assembly. Place the spindle or body of the center joint, and place the receiving plate on the body or spindle of the center joint. A jig for assembling a center joint, wherein a spindle is fitted with a spindle. 2. A center joint assembling jig according to claim 1, further comprising a pressing block attached to a lower end of said screw rod so as to be tiltable in all directions. 3. A center joint assembling jig according to claim 1, wherein a rotary bearing is provided between said receiving plate and said screw rod. 4. A center joint assembling jig according to any one of claims 1 to 3, wherein said base is provided with means for positioning said body or spindle.