JP2012233538A - Grease injection device and crawler belt tensile force adjustment device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grease injection device capable of preventing the scattering of grease caused by the careless removal of a nipple.SOLUTION: A grease injection device provided with an injection device body 23 having a built-in first check valve 29 that is comprised of a valve and a valve spring inside and blocks the outflow of grease, and a grease nipple 32 having a second check valve 41 which is fixedly inserted into the injection device body 23 and comprised of a valve and valve spring inside and inhibits the outflow of the grease is characterized in that the outer peripheral surface of the grease nipple 32 body has a hexagonal part 40 where a turning tool is engaged and a circular counterbore 36 which is arranged at the injection device body to store the hexagonal part 40 and has an internal diameter smaller than the outer shape of the general-purpose turning tool.

Description

  The present invention relates to a grease injection device and a crawler belt tension adjusting device using the same.

  In general, a construction machine such as a hydraulic excavator or a hydraulic crane includes a traveling body having an endless track. The traveling body is provided with a crawler belt tension adjusting device that adjusts the tension of the endless track crawler belt that spans between the driving wheel and the idle wheel. In this crawler belt tension adjusting device, a grease that injects grease into the crawler belt tension adjusting device against the spring in the crawler belt tension adjusting device in order to adjust the tension of the crawler belt according to the situation of the work site and work contents An infusion device is provided.

  As this type of grease injection device, for example, there is one described in Patent Document 1. The grease injecting device described in Patent Document 1 is provided with a check valve composed of a ball valve and a valve spring on the inside of the nipple main body and the head nipple provided on the nipple main body, respectively. It avoids and eliminates multiple leaks.

Japanese Utility Model Publication No. 10-246

  In the above-described grease injection device, the valve spring of the check valve installed in the nipple body may be damaged or the head of the head nipple may be damaged during use of the construction machine. May need to be replaced.

  When replacing the grease injection device, loosen the nipple body from the crawler belt tension adjustment device, discharge the high-pressure grease in the grease chamber of the crawler belt tension adjustment device to the outside, reduce the pressure in the grease chamber, then the head nipple Remove the head from the nipple body and replace it with a new head nipple.At the time of this replacement, neglect the work to reduce the pressure in the grease chamber of the crawler belt tension adjusting device and remove the head nipple from the nipple body. May end up.

  In this case, normally, the high-pressure grease in the grease chamber of the crawler belt tension adjusting device is prevented from leaking to the outside by the check valve in the nipple body, so that it cannot leak from the screw hole of the head nipple. However, if the valve spring constituting the check valve in the nipple body is broken, the high-pressure grease in the grease chamber of the crawler belt tension adjusting device passes through the check valve in the nipple body, It may have flowed out to the head nipple.

  If the head nipple is removed from the nipple body in this state, there is a problem that high-pressure grease scatters to the outside at high speed from the screw-in hole of the head nipple and stains the periphery.

  The present invention has been made based on the above-described matters, and an object of the present invention is to provide a grease injecting device capable of preventing the scattering of grease due to inadvertent removal of the nipple, and a crawler belt tension adjusting device using the same. There is to do.

  In order to achieve the above object, a first invention comprises an injection device body comprising a valve and a valve spring inside and having a first check valve for preventing the outflow of grease, and screwed into the injection device body. A grease injection device comprising a grease nipple that is fixed and includes a valve and a valve spring and has a second check valve for preventing the grease from flowing out, and a turning tool on the outer peripheral surface of the body of the grease nipple A hexagonal portion for engaging the hexagonal portion is provided, and a circular counterbore portion for accommodating the hexagonal portion, which is provided in the main body of the injection device and has an inner diameter smaller than that of a general-purpose turning tool, is provided.

  Further, according to a second invention, in the first invention, the hexagonal portion of the grease nipple includes a screw portion provided on an outer peripheral surface on one side having the second check valve in the body of the grease nipple, and the It is provided on the outer peripheral surface between the nipple portion on the other side of the main body of the grease nipple.

  Furthermore, a third invention is characterized in that, in the first or second invention, the circular counterbore part is formed at a central part of a hexagonal part in the injection device main body.

  According to a fourth aspect of the present invention, there is provided a crawler belt tension adjusting device including the grease injection device according to any one of the first to third aspects of the invention.

  According to the present invention, since the careless removal of the grease nipple cannot be performed, it is possible to prevent the grease from scattering due to the careless removal of the grease nipple.

It is a vertical side view of the idler wheel side of the crawler belt tension adjusting device provided with an embodiment of the grease injection device of the present invention. FIG. 2 is a longitudinal plan view showing, on an enlarged scale, a portion provided with an embodiment of the grease injection device of the present invention shown in FIG. 1. FIG. 3 is an enlarged longitudinal plan view showing an embodiment of the grease injection device of the present invention shown in FIG. 2. It is the figure which looked at one Embodiment of the grease injection apparatus of this invention shown in FIG. 3 from the IV-IV arrow. It is a front view which shows an example of the turning tool used for one Embodiment of the grease injection | pouring apparatus of this invention. It is a side view of the socket part of an example of the turning tool used for one Embodiment of the grease injection apparatus of this invention shown in FIG.

Hereinafter, an embodiment of a grease injection device of the present invention and a crawler belt tension adjusting device using the same will be described with reference to the drawings.
FIG. 1 is a longitudinal side view of the idler wheel side of a crawler belt tension adjusting device including an embodiment of the grease injection device of the present invention, and FIG. 2 includes an embodiment of the grease injection device of the present invention shown in FIG. FIG. In these drawings, first, a crawler belt tension adjusting device including an embodiment of the grease injection device of the present invention will be described.

  In FIG. 1, a crawler belt tension adjusting device 1 is installed in a traveling body of a construction machine in this example. The traveling body 2 of the construction machine includes a traveling body frame 3, drive wheels (not shown) provided on one side of the traveling body frame 3 (left side in FIG. 1), and the other side of the traveling body frame 3 (in FIG. 1). A free wheel 4 provided on the right side, and an endless track foot (not shown) that spans the idle wheel 4 and a drive wheel (not shown).

  On the other side (right side in FIG. 1) of the traveling body frame 3, idler wheel brackets 5 are provided in the vertical direction on the paper surface of FIG. The idler wheel bracket 5 is provided with guide rails 6 for guiding the idler wheel 4.

  Between the idler wheel brackets 5, a yoke 7 is arranged which is bifurcated into a bifurcated shape, extends in parallel, is formed in a substantially U shape, and includes an arm portion 7 a and a rod portion 7 b connected to the arm portion 7 a. The arm portion 7 a of the yoke 7 supports the shaft 4 a of the idler wheel 4 via the bearing 8 so as to be rotatable. Further, the arm portion 7 a of the yoke 7 is guided and supported by the guide rail 6 of the idler wheel bracket 5 so as to be movable in the front-rear direction (the left-right direction in FIG. 1) of the traveling body frame 3.

Next, a configuration of the crawler belt tension adjusting device 1 that is provided between the traveling body frame 3 and the idler wheel 4 and adjusts the crawler belt tension by moving the idler wheel 4 forward and backward of the traveling body frame 3 is configured. This will be described with reference to FIGS.
As shown in FIG. 1, the crawler belt tension adjusting device 1 includes a support plate 9 provided in the traveling body frame 3, and a cylinder 10 disposed between the support plate 9 and the idler wheel bracket 5 in the traveling body frame 3. And one end is connected to the rod portion 7b of the yoke 7, the other end is inserted into one side of the cylinder 10 and the piston rod 11 on the yoke side is positioned on the support plate 9 by the nut 12, and the other end is A frame-side piston rod 13 inserted into the other side of the cylinder 10, and a spring 16 installed between a spring receiving member 14 provided on the support plate 9 and a spring receiving member 15 provided on the outer periphery of the cylinder 10. ing. The nut 12 is secured to the piston rod 13 on the frame side by a set screw 12a.

  A grease chamber 17 is formed in the cylinder 10 by the end faces of the piston rod 11 on the yoke side and the piston rod 13 on the frame side. The grease chamber 17 communicates with one end of a grease passage 18 provided in the frame side rod 13 so as to extend in the axial direction. The other end of the grease passage 18 is closed by a plug 19 as shown in FIG. As shown in FIG. 2, a grease passage 20 provided in the frame side rod 13 from the radial direction is connected to the other end side of the grease passage 18.

  As shown in FIG. 2, a grease injection device 21 is screwed into the grease passage 20 via a nut 12. The nut 12 is provided with a grease G discharge hole 22 that is discharged through the grease injection device 21. Further, the traveling body frame 3 facing the grease injection device 21 is formed with a hole 3a for inserting a turning tool.

Next, the configuration of the above-described grease injection device 21 will be described with reference to FIGS. 3 and 4. 3 and FIG. 4, the same parts as those in FIG. 1 and FIG.
The grease injection device 21 includes a screw portion 24 that is screwed into the screw portion 13a of the piston rod 13 on the frame side on the outer periphery of one side of the cylindrical main body 23, and the screw portion 24 is provided on the other side of the main body 23. A hexagonal portion 25 is provided to engage a tool that is tightened or loosened.

  A tapered portion 26 is formed at the tip of one side of the main body 23 of the grease injection device 21. The tapered portion 26 normally closes the grease passage 20 by abutting against a corner portion 27 formed in the grease passage 20 by tightening the main body 23.

  The screw portion 24 of the main body 23 is provided with a grease relief groove 28 in the axial direction of the main body 23 for allowing the grease passage 20 to communicate with the discharge hole 22 of the grease G when the main body 23 is loosened.

  A first check valve storage space 30 for storing the first check valve 29 and a valve seat 31 are formed inside one side of the main body 23 of the grease injection device 21. The first check valve 29 housed in the first check valve housing space 30 includes a spherical valve 29 a that contacts the valve seat 31 and a valve spring 29 b that presses the valve 29 a against the valve seat 31. ing.

  A grease nipple storage hole 33 for storing the grease nipple 32 is formed inside the other side (hexagonal portion 25 side) of the main body 23 of the grease injection device 21. The grease nipple storage hole 33 can communicate with the first check valve storage space 30 through the communication hole 34.

  On the side of the communication hole 34 of the hole 33 for storing the grease nipple, there is provided a screw hole 35 to be screwed with a thread portion of the grease nipple 32 described later in detail. In addition, a circular counterbore portion 36 that houses a hexagonal portion of a grease nipple 32, which will be described in detail later, is formed at the center of the hexagonal portion 25 of the main body 23 of the grease injection device 21.

  Next, the configuration of the above-described grease nipple 32 will be described with reference to FIGS. 3 and 4. The grease nipple 32 is provided on the outer periphery of the main body 37 of the grease nipple 32, one side of the main body 37, and is provided on the other side of the main body 37, and is connected to the grease gun. A nipple portion 39 and a hexagonal portion 40 that is provided on an intermediate outer periphery of the main body 37 and engages with a tool for tightening or loosening the screw portion 38 are provided.

  In the body 37 of the grease nipple 32, a second check valve storage space 42 for storing the second check valve 41 is formed. The second check valve 41 stored in the second check valve storage space 42 includes a spherical valve 41 a that abuts the inner surface of the nipple portion 39 and a valve spring 41 b that presses the valve 41 a. Yes.

  As described above, the circular counterbore portion 36 formed at the center of the hexagonal portion 25 of the main body 23 in the grease injecting device 21 accommodates the hexagonal portion 40 of the grease nipple 32. The inner diameter of the circular counterbore portion 36 is set so that the socket portion of the turning tool cannot be inserted and the socket portion of a special turning tool described later can be inserted.

  The relationship between the inner diameter dimension of the circular counterbore part 36 and the special turning tool used in the present invention will be described with reference to FIGS.

  First, as shown in FIGS. 5 and 6, a special turning tool 42 used in the present invention includes a socket portion 42a, a rod 42b having one end fixed to the socket portion 42a, and a handle fixed to the other end of the rod 42b. 42c. As shown in FIG. 6, a hexagon hole 42d into which the hexagonal portion 40 of the grease nipple 32 is fitted is provided in the socket portion 42a.

  As shown in FIG. 6, the wall thickness T between the outer peripheral surface of the socket portion 42a and the corner portion of the hexagonal hole 42d is set smaller than that of the socket portion of a normal turning tool. In other words, the diameter D of the outer peripheral surface of the socket part 42a is set smaller than that of the socket part of a normal turning tool.

  In relation to the configuration of the socket portion 42a of the special turning tool 42 described above, the diameter of the circular counterbore portion 36 formed in the hexagonal portion 25 of the main body 23 in the grease injection device 21 is the socket portion of the special turning tool 42. The dimension is set such that the outer peripheral surface of 42a is fitted. As a result, the socket part of a normal turning tool cannot be fitted into the hexagonal part 40 of the grease nipple 32, and the socket part 42a of the special turning tool 42 described above can be fitted into the counterbore part 36. Yes.

Next, the operation of the crawler belt tension adjusting apparatus 1 having the above-described embodiment of the grease injection device 21 of the present invention and the embodiment of the grease injection device of the present invention will be described.
First, the operation of the crawler belt tension adjusting device 1 will be described. The crawler belt tension adjusting device 1 presses the idler wheel 4 in the direction away from the driving wheel by the spring force of the spring 16, thereby giving an appropriate tension to the crawler belt. Yes. For example, when the construction machine is traveling, the crawler belt is deformed according to the undulations of the ground, and when a load is applied to the idler wheel 4 toward the drive wheel, the spring 16 is bent and deformed, thereby In contrast, an excessive load (tension) is prevented from acting.

  In some cases, the condition of the crawler belt of the construction machine is adjusted in accordance with the situation of the work site and the work content. In this case, when a grease gun is connected to the nipple portion 39 of the grease nipple 32 shown in FIG. 3 and the grease gun is operated to supply the grease, the grease opens the second check valve 41 in the grease nipple 32. Then, it flows into the main body 23 of the grease injection device 21.

  The grease opens the first check valve 29 through the communication hole 34 by the supply pressure of the grease gun, and flows into the grease chamber 17 shown in FIG. 1 through the grease passages 20 and 18. Thereby, the tension of the crawler belt can be adjusted.

  Next, when the nipple portion 39 of the grease nipple 32 is damaged, the grease nipple 32 is removed from the main body 23 of the grease injection device 21 and replaced with a new grease nipple 32. Since the hexagonal portion 40 is accommodated in the circular counterbore portion 36 of the main body 23 in the grease injection device 21, the grease nipple 32 is removed from the main body 23 of the grease injection device 21 using a normal turning tool. I can't.

  For this reason, the main body 23 of the grease injection device 21 is loosened, and the grease escape groove 28 provided in the screw portion 24 of the main body 23 is communicated with the discharge hole 22. Thereby, since the high-pressure grease in the grease chamber 17 is discharged to the outside through the grease escape groove 28 and the discharge hole 22, scattering of the high-pressure grease can be suppressed.

  Further, the valve spring 29a of the first check valve 29 installed in the main body 23 of the grease injection device 21 may be damaged. In this case, since the high-pressure grease flows into the grease nipple 32, the removal of the grease nipple 32 can be prevented as described above, and scattering of the high-pressure grease can be suppressed.

  To replace the grease nipple 32, after releasing the pressure of the grease as described above, the socket portion 42a of the turning tool 42 shown in FIG. 5 and FIG. The grease nipple 32 can be extracted from the main body 23 of the grease injection device 21 by fitting in the space S between the circular counterbore part 36 and turning the handle 42c.

  According to the embodiment of the present invention, since the careless removal of the grease nipple 32 is prevented, it is possible to prevent the grease from scattering due to the careless removal of the grease nipple 32.

  Moreover, when applied to the crawler belt tension adjusting device 1 provided with the embodiment of the grease injection device 21 of the present invention, the scattered grease wiping work is not required.

  In the above-described embodiment, the grease injecting device 21 is arranged in the radial direction of the piston rod 13 on the frame side. However, it can also be provided on the end surface portion of the piston rod 13 on the frame side.

DESCRIPTION OF SYMBOLS 1 Crawler belt tension adjustment apparatus 21 Grease injection apparatus 23 Main body 29 of grease injection apparatus 1st check valve 32 Grease nipple 36 Circular counterbore part 40 Hexagon part 41 2nd check valve 42 Turning tool

Claims (4)

An injection device body comprising a valve and a valve spring inside and having a first check valve for preventing the outflow of grease, and screwed and fixed to the injection device body, and comprising a valve and a valve spring inside. A grease injection device comprising a grease nipple having a second check valve for preventing outflow;
On the outer peripheral surface of the body of the grease nipple, a hexagonal portion that engages with a turning tool is provided,
A grease injection device, characterized in that a circular counterbore portion is provided in the injection device main body and has an inner diameter smaller than the outer shape of a general-purpose turning tool and accommodates the hexagonal portion. The grease injection device according to claim 1,
The hexagonal portion of the grease nipple is between a screw portion provided on an outer peripheral surface on one side having the second check valve in the body of the grease nipple and a nipple portion on the other side of the body of the grease nipple. A grease injection device provided on an outer peripheral surface. In the grease injection device according to claim 1 or 2,
The above-described circular counterbore portion is formed at the center of the hexagonal portion of the injection device main body. A crawler belt tension adjusting device comprising the grease injecting device according to any one of claims 1 to 3.

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