JP2017096295A - Dust proof structure of fill valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust proof structure of a fill valve capable of surely preventing foreign matter from entering the fill valve, and preventing falling even under large vibration or impact.SOLUTION: A dust proof structure of a fill valve is formed with a nipple 2 in which an injection port 1 for supplying grease is formed. A check valve 3 configured to prevent backflow of grease is formed at the depth of the nipple 2. The dust proof structure is provided with: a sealing plate 4 contacting with a tip part 2A of the nipple 2 to seal the injection port 1; a cylindrical fixing pipe 5 surrounding a side surface of the nipple 2 from the periphery of the sealing plate 4; and a fixing screw 6 penetrating fixing pipe 5 to crimp and fix the fixing pipe to the side surface of the nipple 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a dustproof structure for a fill valve that prevents foreign matter such as earth and sand from entering a fill valve mounted on a crawler of a construction machine or a muddy work vehicle.

  The working environment such as construction machines and muddy ground vehicles is assumed to run on crawlers not only in muddy areas, but also on the ground such as earth and sand layers, clay layers, volcanic ash layers, and coal surface layers. A general grease nipple has a ball-shaped check valve at the tip of the nipple, but a crawler of a construction machine or a muddy work vehicle is called a fill valve in which the check valve is arranged at the back of the nipple. Special grease nipple is used.

  However, when used in a poor working environment, it often adheres to the tip of the fill valve. When grease is injected as it is, foreign matter such as earth and sand enters the inside together with the grease, and grease leakage occurs. As a result, problems such as loosening of the crawler occur. Therefore, conventionally, a cleaning operation such as wiping off foreign matter at the tip of the fill valve is required before supplying grease.

  Therefore, as described in Patent Document 1, a grease nipple protection device that prevents mud clogging of the fill valve has been proposed. In this protective device, a protective recess is formed around the grease nipple, a cylindrical cap mounting cylinder is fitted inside the protective recess, and a mudguard cap is fitted into the opening of the cap mounting cylinder. It is.

JP 2008-95775 A

  However, in the protective device described in Patent Document 1, since a synthetic resin cap mounting cylinder is fitted inside the protective recess, large vibrations generated in construction machines and muddy work vehicles are applied, and earth and sand are attached to the cap. If it collides with the mounting cylinder, the cap mounting cylinder may easily drop and the cap may open.

  Moreover, since the ball-shaped check valve is not arranged at the tip of the fill valve, and the injection hole is always open, foreign matter enters the inside of the injection hole and grease leakage occurs. It is necessary to disassemble and clean the fill valve. However, it is extremely difficult to remove foreign matters even in this disassembly and cleaning operation, and grease leakage cannot be eliminated. Since the cap of Patent Document 1 is configured to cover a portion away from the tip of the injection hole, if a small amount of foreign matter adheres to the inside of the cap mounting cylinder or the cap, the foreign matter is released in the cap due to vibration or the like. As a result, there is a risk of entering the inside of the injection hole.

  Furthermore, in Patent Document 1, since a protective recess is formed around the fill valve, if the cap mounting cylinder falls from the protective recess, foreign matter tends to accumulate in the protective recess, and the protective recess. There was also a risk that the foreign matter inside would fill the fill valve.

  Therefore, the present invention was created to solve the above-described problems, and can reliably prevent foreign matter such as earth and sand from entering the fill valve used in construction machines and muddy work vehicles. The purpose of the present invention is to provide a dust-proof structure for a fill valve that can prevent a drop even by a large vibration or impact generated in a muddy work vehicle.

  In order to achieve the above-mentioned object, the first means in the present invention comprises a nipple 2 in which an inlet 1 for supplying grease is formed, and a check valve 3 for preventing the backflow of grease in the back of the nipple 2. In the fill valve, a sealing plate 4 that seals the inlet 1 in contact with the tip 2A of the nipple 2, a cylindrical fixed tube 5 that surrounds the side surface of the nipple 2 from the periphery of the sealing plate 4, and a fixed A fixing screw 6 that penetrates the tube 5 and is fixed to the side surface of the nipple 2 by pressure is provided.

  The sealing plate 4 of the second means has a fitting protrusion 4A protruding from the side of the nipple 2 that comes into contact with the tip 2A.

  In the third means, the nipple 2 has a shape including a tapered side surface 2B extending rearward from the distal end portion 2A, and a recess 2C adjacent to the tapered side surface 2B. A fitting surface 5A that fits on the outer periphery is formed on the inner surface of the fixed tube 5, and when the sealing plate 4 seals the injection port 1, the tip of the fixing screw 6 is crimped to the recess 2C. It is comprised so that it may do.

  The nipple 2 of the fourth means extends from the recess 2C toward the rear of the nipple 2 and is formed so as to be gripped by a tool, and the hexagonal portion 2D has an open end of the fixed pipe 5 A fitting groove 2E for fitting the portion 5B is formed, and a locking recess 5C for locking the tool is formed on the outer surface of the fixed tube 5 so that the release end 5B is removed from the fitting groove 2E. Is.

  According to the first aspect of the present invention, the sealing plate 4 that seals the inlet 1 in contact with the tip 2A of the nipple 2 is formed, so that the inlet 1 of the fill valve that is always open is reliably sealed. Can be stopped.

  In addition, the sealing plate 4 and the fixing tube 5 are provided with the fixing screw 6 that passes through the cylindrical fixing tube 5 surrounding the side surface of the nipple 2 from the periphery of the sealing plate 4 and is fixed to the side surface of the nipple 2 by pressure bonding. It can be securely fixed and can withstand large vibrations and shocks. As a result, there is no fear that the fixed pipe 5 will fall easily even if a large vibration generated in the construction machine or muddy work vehicle is applied, and earth and sand collide with the cap mounting cylinder.

  Since the sealing plate 4 is provided with a fitting protrusion 4A that is fitted into the inlet 1 on the side of the nipple 2 in contact with the tip 2A, the inlet 1 Prevent foreign matter from entering inside. Further, the insertion protrusion 4A can prevent the displacement of the sealing plate 4 and the fixed tube 5 and can enhance the drop-off preventing force due to vibration and impact.

  As in claim 3, the nipple 2 has a shape including a tapered side surface 2 </ b> B that extends rearward from the distal end portion 2 </ b> A, and a recess 2 </ b> C adjacent to the tapered side surface 2 </ b> B, Since the fitting surface 5A to be fitted on the inner surface of the fixed tube 5 is formed, the fitting surface 5A and the sealing plate 4 can be closely attached to the tip portion of the nipple 2 for protection. Moreover, since the tip of the fixing screw 6 is crimped to the recess 2C when the sealing plate 4 seals the injection port 1, the recess 2C serves as a retaining screw for the fixing screw 6, A reliable fixing force can be obtained.

  As in claim 4, the nipple 2 extends from the recess 2C toward the rear of the nipple 2 and is formed with a hexagonal portion 2D formed so as to be gripped by a tool, and the release end portion 5B of the fixed tube 5 is provided on the hexagonal portion 2D. Since the fitting groove 2E to be fitted is formed, the nipple 2 and the fixed tube 5 can be fixed integrally.

  Moreover, since the fitting groove 2E is formed in the thick hexagonal part 2D, there is no possibility that the strength of the nipple 2 is lowered by the fitting groove 2E. Further, the hexagonal portion 2D can be rotated with a tool even while the release end portion 5B is fitted in the fitting groove 2E.

  Further, a locking recess 5C for locking the tool is formed on the outer surface of the fixed tube 5 in which the release end 5B is fitted in the fitting groove 2E, and the release end 5B is removed from the fitting groove 2E. Therefore, the release end 5B fitted in the fitting groove 2E can be easily removed.

  As described above, according to the present invention, foreign matter such as earth and sand can be surely prevented from entering the fill valve used in the construction machine and the muddy work vehicle, and the large vibration generated in the construction machine and the muddy work vehicle can be prevented. It achieved the original goal of being able to prevent falling even when impacted.

It is a longitudinal cross-sectional view which shows one Example of this invention. It is a disassembled perspective view which shows one Example of this invention. It is sectional drawing to which the principal part of this invention was expanded. It is a longitudinal cross-sectional view which shows the other Example of the sealing board of this invention.

  The dust-proof structure of the present invention is used for a fill valve having a nipple 2 in which an inlet 1 for supplying grease is formed and a check valve 3 for preventing a reverse flow of grease at the back of the nipple 2. As a main configuration, a sealing plate 4, a fixed tube 5, and a fixing screw 6 are provided (see FIG. 1). The material constituting them can be a metal material such as stainless steel, or a hard plastic resin.

  The sealing plate 4 is a plate-like member that contacts the tip 2A of the nipple 2 and seals the injection port 1 (see FIG. 3). In the illustrated example, the inner surface of the sealing plate 4 is in direct contact with the portion that contacts the tip of the nipple 2, but the nipple 2 is brought into contact with the contact portion via an elastic material or cushioning material. The protection of the tip can be strengthened (not shown). The illustrated nipple 2 has a shape including a tapered side surface 2B extending from the front end portion 2A toward the rear, and a recess 2C adjacent to the tapered side surface 2B (see FIG. 2).

  Furthermore, it is also possible to provide a fitting protrusion 4A that fits into the injection port 1 on the side of the sealing plate 4 that contacts the tip 2A of the nipple 2 (see FIG. 4). The insertion protrusion 4A reliably prevents foreign matter from entering the inlet 1 and also prevents the sealing plate 4 and the fixed tube 5 from being displaced by the insertion protrusion 4A.

  The fixed tube 5 is a member integrally formed from the periphery of the sealing plate 4 and has a cylindrical shape surrounding the side surface of the nipple 2 (see FIG. 2). In the example of illustration, the fitting surface 5A which fits the outer periphery of the taper side surface 2B is formed in the inner surface of the fixed pipe 5 (refer FIG. 3). The fitting surface 5A and the inner surface of the sealing plate 4 wrap the tip of the nipple 2 in a close state. Therefore, if even a small amount of foreign matter adheres to the intimate portion, the foreign matter becomes a hindrance and it is difficult to fill the tip of the nipple 2.

  The fixing screw 6 is a screw-like member that passes through the fixing tube 5 and is fixed to the side surface of the nipple 2 by pressure. The tip of the fixing screw 6 is configured to be crimped to the recess 2C (see FIG. 1). The illustrated fixing screw 6 is provided with a slit on the head so as to use a flathead screwdriver (see FIG. 2). That is, if a wrench hole or a cruciform groove for a plus driver is provided on the head, it becomes difficult to insert the tip of the wrench or the plus driver when clay or earth and sand adheres to the head. On the other hand, in the case of slitting, the fixing screw 6 can be turned by simply removing the clay or earth and sand inside the tip of the flathead screwdriver.

  The nipple 2 in the illustrated example has a tapered side surface 2B and a recessed portion 2C that are continuously provided from the distal end portion 2A, and extends from the recessed portion 2C toward the rear of the nipple 2 so as to be gripped by a tool. 2D is provided. And it is also possible to form a fitting groove 2E on the entire surface side of the hexagonal portion 2D and to provide a release end portion 5B of the fixed tube 5 described later (see FIG. 3). When the release end 5B is fitted in the fitting groove 2E in this way, the release end portion is fitted from the fitting groove 2E by locking the tool in the locking recess 5C formed on the outer surface of the fixed tube 5. The work which removes 5B is made easy. The fitting groove 2E and the locking recess 5C can be arbitrarily set.

  The fill valve has a configuration including a check valve 3 for preventing a reverse flow of grease in the back of the nipple 2 (see FIG. 1). In the illustrated example, a pair of check valves 3 including a check ball 3A, a coil spring 3B, and a seal ring 3C are arranged behind the nipple 2. Further, the counter electrode portion of the nipple 2 is provided with a connection seal portion 7 for connection to an oil tank or the like.

  In addition, each structure of this invention is not limited to the example of illustration, For example, the shape and structure of the sealing plate 4, the fixed pipe 5, the fixing screw 6, etc., or the shape of the nipple 2 are the gist of this invention. It is possible to change arbitrarily within the range which does not change.

DESCRIPTION OF SYMBOLS 1 Injection port 2 Nipple 2A Tip part 2B Tapered side surface 2C Recessed part 2D Hexagon part 3 Check valve 3A Check ball 3B Coil spring 3C Seal ring 4 Sealing plate 4A Insertion protrusion 5 Fixed pipe 5a Screw hole 5A Fitting surface 5B Release End 5C Locking recess 6 Fixing screw 7 Connection seal

Claims (4)

  Seal that seals the inlet in contact with the tip of the nipple in a fill valve having a nipple formed with an inlet for supplying grease and a check valve for preventing backflow of grease at the back of the nipple A dust-proof structure for a fill valve comprising: a plate, a cylindrical fixed tube surrounding the side surface of the nipple from the periphery of the sealing plate, and a fixing screw that passes through the fixed tube and is fixed to the side surface of the nipple by pressure bonding .   2. The dust-proof structure for a fill valve according to claim 1, wherein the sealing plate is provided with a fitting projection that fits into the injection port on the side of the nipple that contacts the tip.   The nipple has a shape including a tapered side surface extending rearward from the distal end portion and a recess adjacent to the tapered side surface, and a fitting surface that fits on an outer periphery of the tapered side surface is formed on the fixed pipe. The dust-proof structure of the fill valve according to claim 1 or 2, wherein the tip of the fixing screw is pressure-bonded to the recess when the sealing plate seals the injection port.   The nipple has a hexagonal portion formed so as to spread from the recess toward the rear of the nipple and gripped by a tool, and a fitting groove into which the open end of the fixed pipe is fitted. 4. A dustproof structure for a fill valve according to claim 3, wherein a locking recess for locking the tool is formed on the outer surface of the fixed tube so that the release end is removed from the fitting groove.

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