JP5591015B2 - Installation structure of greasing valve and greasing valve of crawler belt adjustment cylinder - Google Patents

Description

  The present invention relates to an installation structure for a greasing valve and a drainage valve of a crawler belt adjusting cylinder.

  A crawler type traveling vehicle such as a hydraulic excavator or a bulldozer has a crawler belt adjustment cylinder for adjusting the tension of the crawler belt of the traveling device. Adjusting the amount of extension and adjusting the track tension.

  In order to inject or discharge the grease, a grease supply valve that is a fill valve for injection and a drainage valve that is a relief valve for discharge are attached to the cylinder (see, for example, Patent Document 1). ).

  The grease supply valve is provided with a ball check valve so that grease can be injected from the outside to the inside of the cylinder and the outflow from the inside to the outside is prevented. The degrease valve is attached to the cylinder with a screw so that it can be moved forward and backward. By screwing the valve body at the tip into contact with the valve seat of the cylinder, the grease is prevented from flowing out. By releasing the contact of the valve seat, the grease in the cylinder can be discharged to the outside.

Japanese Patent Laying-Open No. 2006-159966 (FIG. 5)

  The conventional crawler belt adjusting cylinder of the form as described above has the following problems to be solved in relation to the greasing valve and the greasing valve.

  Since the crawler belt adjusting cylinder receives the load of the crawler belt type traveling device, the internal pressure becomes high pressure, and this high pressure also acts on the greasing valve and the greasing valve. Particularly large pressure fluctuations occur due to bumpy ground running, collision with obstacles, repeated forward and backward movement, and the like. In addition, the crawler belt adjustment cylinder equipped on the traveling device that touches earth and sand is likely to be mixed with fine foreign matter during lubrication, and if foreign matter enters the ball check part of the greasing valve under high pressure, It may cause sheet failure and grease leakage. Furthermore, since a high pressure that fluctuates acts on the ball check portion, wear and contact failure of the seat portion are likely to occur.

  The present invention has been made in view of the above-mentioned facts, and its technical problem is to prevent the fluctuating high pressure in the cylinder from acting on the greasing valve of the crawler belt adjusting cylinder, thereby preventing the greasing valve from being damaged and reliable. It is to provide an installation structure of a greasing valve and a draining valve of a crawler belt adjusting cylinder capable of improving performance.

According to the present invention, as an installation structure of the lubrication valve and the drainage valve of the crawler belt adjusting cylinder that solves the above technical problem, a drainage valve mounting hole that penetrates the inside and outside of the cylinder and communicates with the exhaust hole on the way, A greasing valve mounting hole that communicates inward from the drain hole of the drain valve mounting hole from the outside is provided. The drain valve mounting hole has a valve seat on the inside and female threads on both sides of the outer drain hole. and, discharging fat valve has valve seat freely contacts and separates abuts out the closing valve of the cylinder to the tip, and a male screw to be screwed to the female screw, Kyuaburaben mounting hole, Haiaburaben attached communicating between the valve seat and the internal thread hole, Kyuaburaben has a check valve which prevents fluid flow from inside to outside of the cylinder, the valve body and the valve seat of Haiaburaben abuts when you are in, it is closed the communication between Kyuaburaben mounting hole and the cylinder, when the lubrication, the valve moves the Haiaburaben outside the Haiaburaben mounting hole The crawler belt is characterized in that it is separated from the valve seat of the mounting hole so that the greasing valve mounting hole communicates with the inside of the cylinder, and at the time of degreasing, the greasing valve is further moved outward to communicate the inside of the cylinder and the discharging hole. An installation structure for a lubrication valve and a drainage valve of the adjusting cylinder is provided.

  The grease feed valve and drainage valve installation structure of the crawler belt adjustment cylinder constructed according to the present invention is configured such that the grease feed valve communicates with the outside of the valve seat portion that opens and closes the cylinder inside and outside the drainage valve mounting hole. It is installed in the greasing valve mounting hole. That is, the greasing valve is not directly connected to the cylinder, but is connected to the outside of the valve seat of the greasing valve.

  Therefore, it is possible to prevent the fluctuating high pressure in the cylinder from acting on the greasing valve of the crawler belt adjusting cylinder, to prevent the greasing valve from being damaged, and to improve the reliability.

FIG. 3 is a cross-sectional view showing the installation structure of a greasing valve and a degreasing valve of a crawler belt adjusting cylinder configured according to the present invention, and an enlarged cross-sectional view seen in the direction of arrows AA in FIG. Sectional drawing of a crawler belt adjustment cylinder. The side view of a crawler belt type traveling device.

  Hereinafter, the installation structure of the greasing valve and the drainage valve of the crawler belt adjusting cylinder configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment.

  First, a crawler type traveling apparatus provided with a crawler belt adjusting cylinder will be described with reference to FIG. The crawler type traveling device indicated by the whole number 2 is wound around an idler 6 rotatably attached to one end of the track frame 4, a sprocket 8 attached to the other end, and the idler 6 and the sprocket 8. A crawler belt 10 is provided. By driving the sprocket 8, the crawler type traveling device 2 travels back and forth (left and right in FIG. 3). Adjustment of the tension Z of the crawler belt 10 is performed by extending or contracting the crawler belt adjustment cylinder 12 attached to the track frame 10 to move the position of the idler 6 back and forth.

  The crawler belt adjusting cylinder 12 will be described with reference to FIG. The crawler belt adjusting cylinder 12 includes a cylindrical cylinder portion 14 having one end (the right end in FIG. 2) opened, and a columnar adjuster piston 16 inserted into the cylinder portion 14 so as to freely enter and exit. The amount of protrusion from the open end of the adjuster piston 16 is adjusted by injecting grease, which is an incompressible fluid, into the cylinder portion 14 from the closed end side or discharging grease from the inside of the cylinder portion 14.

  A dust seal 18 that is in sliding contact with the outer periphery of the adjuster piston 16 is attached to the open end of the cylinder portion 14, and a pair of piston seals 20 and 20 that are in sliding contact with the inner diameter of the cylinder portion 14 are attached to the outer periphery of the adjuster piston 16.

  1 will be described with reference to FIG. At the closed end of the cylinder part 14, a grease supply valve 22 for injecting grease into the cylinder and a drainage valve 24 for discharging are installed through a small diameter part 14a formed at the center of the cylinder part 14. .

  A description will be given mainly with reference to FIG. The oil supply valve 22 and the oil discharge valve 24 are installed in the inside and outside of the cylinder 12, that is, the oil discharge valve mounting hole 28 through which the discharge hole 26 communicates with the small diameter portion 14 a radially outside and inside the cylinder portion 14. And a greasing valve mounting hole 30 that communicates from the outside of the cylinder 12 to the inside of the draining hole 26 of the draining valve mounting hole 28. The other end of the discharge hole 26 opens outward in the radial direction of the cylinder portion 14.

  The drainage valve mounting hole 28 includes a tapered valve seat 28a that expands inward and a female screw 28b on both sides of the outer discharge hole 26. The degrease valve 24 is provided with an inwardly projecting tapered valve body 24a that abuts the valve seat 28a so as to be freely contactable with the valve seat 28a and closes the inside and outside of the cylinder 12, and a male screw 24b that is screwed into the female screw 28b. . A hexagonal portion 24c for screwing operation in attachment and detachment is formed at an end portion of the drainage valve 24 protruding outward from the cylinder 14.

  Thus, the drainage valve mounting hole 28 is closed by screwing the drainage valve 24 into the drainage valve mounting hole 28 and bringing the valve body 24a at the tip into contact with the valve seat 28a of the drainage valve mounting hole 28. The fat drain valve mounting hole 28 is opened by loosening the fat valve 28 and releasing the contact.

  The greasing valve mounting hole 30 communicates between the valve seat 28a and the female screw 28b of the drainage valve mounting hole 28. The greasing valve 22 includes a check valve 22a that is a ball check valve that is attached by being screwed to a female screw formed in the greasing valve mounting hole 30 and that prevents the flow from the inside of the cylinder 14 to the outside. . The grease supply valve 22 is connected to a grease pump or a grease gun at an end projecting outward from the cylinder 14 to inject grease.

Lubrication:
When grease is fed into the crawler belt adjusting cylinder 12, the drainage valve 24 is moved to the outside of the drainage valve mounting hole 28 (indicated by the arrow X), and the valve body 28a is moved from the valve seat 28a of the drainage valve mounting hole 28. The separated greasing valve mounting hole 30 and the inside of the cylinder 14 are communicated.

Fat drain:
When draining oil in the crawler belt adjusting cylinder 12, the drainage valve 24 is further moved outward X so that the inside of the cylinder 14 communicates with the discharge hole 28b. The grease in the cylinder 14 is discharged by the adjuster piston 16 pushed in the pushing direction by the tension of the crawler belt 10.

Track tension adjustment:
By adjusting the amount of grease supply and drainage, the jumping amount of the adjuster piston 16 is adjusted, and the tension Z (FIG. 3) of the crawler belt 10 is adjusted.

  The effect of the installation structure of the greasing valve and the drainage valve of the crawler belt adjusting cylinder as described above will be described.

  The greasing valve and the greasing valve installation structure of the crawler belt adjusting cylinder constructed according to the present invention is configured such that the greasing valve 22 is provided outside the valve seat 28a that allows the greasing valve mounting hole 28 to be opened and closed in an open / closed manner. It is attached to the greasing valve attachment hole 30 communicating with the direction. That is, the greasing valve 22 is not directly communicated with the cylinder 14, but is connected to the valve body 24a of the drain valve 24 and the outside of the valve seat 28a.

  Therefore, the fluctuating high pressure in the cylinder 14 can be prevented from acting on the greasing valve 22 of the crawler belt adjusting cylinder 12, the damage of the greasing valve 22 can be prevented, and the reliability can be improved. Moreover, since the pressure-resistant intensity | strength of the greasing valve 22 can be lowered | hung, cost reduction is also possible.

  The present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various changes or modifications can be made within the scope of the present invention, for example, as described below. Is.

  In the present embodiment, the discharge hole 26 at the time of greasing is closed by screwing the male screw 24b of the drainage valve 24 and the female screw 28b of the drainage valve mounting hole 28, but it is necessary to further completely close it. In such a case, the outer periphery of the drainage valve 24 positioned between the female screw 28b of the drainage valve mounting hole 28 and the opening portion of the inner grease supply valve mounting hole 30 is in close contact with the inner periphery of the drainage valve mounting hole 28. A high-pressure seal (for example, a smaller piston seal 20 shown in FIG. 2) may be installed.

2: crawler type traveling device 12: crawler belt adjusting cylinder 22: greasing valve 22a: check valve 24: drainage valve 24a: valve body 24b: male screw 26: discharge port 28: drainage valve mounting hole 28a: valve seat 28b: Female thread 30: Greasing valve mounting hole

Claims (1)

The installation structure of the greasing valve and draining valve of the crawler belt adjustment cylinder,
It has a greasing valve mounting hole that penetrates the inside and outside of the cylinder and communicates with the drain hole in the middle, and a greasing valve mounting hole that communicates from the outside of the cylinder to the inside of the drain hole of this greasing valve mounting hole,
The drainage valve mounting hole has a valve seat on the inside and female threads on both sides of the outer discharge hole.
Exhaust fat valve has valve seat freely contacts and separates abuts out the closing valve of the cylinder to the tip, and a male screw to be screwed to the female screw,
The greasing valve mounting hole communicates between the valve seat of the drainage valve mounting hole and the female thread.
The greasing valve has a check valve that prevents the flow of fluid from the inside of the cylinder to the outside,
When the valve body of the degreasing valve and the valve seat are in contact, the communication between the greasing valve mounting hole and the cylinder is closed,
When greasing, move the greasing valve to the outside of the greasing valve mounting hole, separate the valve body from the valve seat of the mounting hole, and connect the greasing valve mounting hole to the inside of the cylinder.
When draining, move the drain valve further outward to allow the inside of the cylinder to communicate with the drain hole.
An installation structure of a greasing valve and a degreasing valve of a crawler belt adjusting cylinder characterized by the above.

Images