Grease automatic feeder

Abstract

To (1) feed grease always continuously and automatically for a long period, (2) feed a proper amount of grease according to climate and weather, (3) make a remaining amount of grease in an automatic feeder visible, and (4) enable the automatic feeder to operate stably by the use of neither an electric pump nor gas expansion.SOLUTION: There is provided an automatic feeder that expands an expansion agent made of powder absorbing vapor in air to expand, to feed grease charged in a cylindrical container, to a bearing. An expansion agent cup filled with the expansion agent is tapered to allow the expansion agent to efficiently expand upward. Even when the cylindrical container expands radially with the pressure of the expansion agent, a rubbery seal plate enters a Poisson deformation state to maintain sealing performance. Suction holes are provided in the expansion agent cup and a piston so that the expansion agent can stably absorb moisture in air. The cylindrical container puts lids on upper and lower sides and can be attached / detached with bolts.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an automatic grease lubricator for constantly and continuously lubricating bearings and the like by pressurizing grease sealed in a cylinder using the continuous expansion of an expansion agent. [Background technology]

[0002] Methods for supplying grease to the bearings of rotating machinery include periodic lubrication with a grease gun and centralized lubrication using an electric pump. Grease guns require manual insertion for each bearing, which is inefficient, and dust accumulates on the grease nipples, which can lead to contamination each time the grease is applied. Electric automatic lubrication requires electrical control and piping, making the entire system expensive and complicated. As problems with bearing grease accumulate immediately after application, such as deterioration, leakage, and the intrusion of moisture and contaminants, there is a demand for an automatic lubricator that can lubricate continuously at all times. The following methods are introduced as specific examples of automatic lubricators.

[0003] In Japanese Patent Publication No. 10-38193, an automatic grease supply device is shown in which grease is stored in an elastic grease container, which is stored in an expansion agent container that stores an expansion agent, and moisture is supplied to the expansion agent through the moisture absorption holes in the expansion agent container, causing the expansion agent to expand and supplying grease to bearings. In this method, it is difficult to seal the elastic grease container and the storage body, and there is a problem that the grease flows back into the storage body. In addition, a method of separating the grease and the expansion agent with a seal plate is exemplified, but there are problems such as the expansion of the expansion agent and the pressurized lubricant causing the storage body to deform in the radial direction, causing the grease to leak into the expansion agent side, preventing the pressure from increasing, and the grease and expansion agent being mixed together, resulting in a decrease in contamination. In addition, since the remaining amount of grease cannot be visually checked, it is necessary to replace it at an appropriate time, which increases costs.

[0004] In JP-A-11-325393, a method is shown in which the expansion force of a solid expansion agent is used to push out the piston and push out the grease. In this method, 1) the expansion agent is shallow because the expansion agent is enclosed in a cone shape, and the extrusion stroke is secured by hydraulic pressure and a two-stage piston, so the structure is complex and heavy. 2) The grease storage section is pressed by the second piston to high pressure and expands radially due to hoop stress, so the expansion amount of the O-ring of the second piston is insufficient, causing grease to leak.

[0005] In JP 2003-83497, an automatic lubricator is shown in which the area of ​​the piston is 1.1 times or more that of the pressing member. In this method, 1) since there is no intake hole in the straight body, the expansion amount of the expansion agent is small, and the replacement cycle of the automatic lubricator is short. 2) Since the cylinder is pushed up only by the contact part, the piston kneads and sticks. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP Patent Publication No. 10-38193 [Patent Document 2] JP 11-325393 Public Relations [Patent Document 3] JP2003-83497 Public Relations Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to solve the following problems: 1) To prevent leakage of grease filled in a cylinder and realize reliable lubrication. 2) To efficiently transmit the expansion force of an expansion agent to the grease so that it can be supplied reliably to the bearings. 3) To enable the remaining amount of grease to be confirmed by simple visual inspection. 4) To enable the supply of an appropriate amount of grease by increasing or decreasing the amount of grease supplied depending on the weather, climate and installation location. 5) To enable constant continuous lubrication over a long period of time to maintain grease with the appropriate properties. 6) To prevent moisture and contamination from entering the bearings. 7) To eliminate the need for manual feeding work. 8) To extend the inspection and management cycle for bearings. [Means for solving the problem]

[0008] The first solution, as shown in claim 1, is an automatic grease lubricator in which an expansion agent and grease are placed on both sides of a cylindrical container with a sealing plate between them, an upper lid with a discharge pipe for discharging grease is provided on the end face of the cylindrical container on the grease side, and a lower lid is provided on the end face of the cylindrical container on the expansion agent side, the upper lid and the lower lid are fixed to the cylindrical container with bolts, the lower lid is provided with a plurality of air vent holes and has a vent cylinder with open ends attached vertically, the vent cylinder is inserted into an air supply cylinder provided with a plurality of air supply holes, the air supply cylinder is attached vertically to a piston plate for pushing up the sealing plate, the expansion agent is filled in the space formed by the piston plate and the bottom lid, air taken in from the air vent cylinder enters the air supply cylinder through the air vent holes and is absorbed by the expansion agent through the air supply hole of the air supply cylinder, the expansion agent is expanded by the moisture contained in the air, and the piston plate is pushed up and the grease is discharged.

[0009] The second solution, as shown in claim 2, is an automatic grease lubricator in which an expansion agent and grease are arranged on both sides of a cylindrical container via a piston plate, an upper lid having a discharge port is provided on the end face of the cylindrical container on the grease side, and a lower lid is provided on the end face of the cylindrical container on the expansion agent side, the upper lid and the lower lid are fixed to the cylindrical container with bolts, a vent tube with multiple vent holes and open at both ends is vertically attached to the lower lid, the vent tube is inserted into an air supply tube with multiple air supply holes, the air supply tube is vertically attached to the piston plate, and the expansion agent is formed by the piston plate and the lower lid. In this automatic grease lubricator, the grease is filled in a space formed by a bellows-like elastic container that can expand and contract, and the air taken in from the vent cylinder enters the air supply cylinder through the vent hole and is absorbed by the expansion agent through the air supply hole, causing the expansion agent to expand with the moisture contained in the air and push up the piston plate to discharge the grease. The grease is filled in a stretchable, bellows-like elastic container, and the elastic container has a discharge pipe with a male thread and is inserted into the discharge port of the top lid. A fixing nut is screwed onto the discharge pipe, and the elastic container is fixed to the top lid by sandwiching the top lid with the fixing nut.

[0010] The third solution is an automatic grease lubricator in which an auxiliary cylinder with an opening on one side is attached to the piston plate described in claim 1 or claim 2, or a reinforcing cylinder with an opening on one side is attached to the bottom cover, as shown in patent claim 3. Effect of the Invention

[0011] The effects of the first solution are: 1) The continuously expanding expansion agent constantly pushes up the piston and the seal plate to pressurize the grease, so that the grease can be continuously supplied to the bearing. 2) The expansion agent has an extremely slow expansion speed, so that the grease can be supplied for a long period of time, and the bearing can be maintained in an appropriate condition. 3) The grease supply speed can be adjusted according to the environment of the installation site by changing the number and size of the ventilation holes and the air supply holes. 4) Unlike manual lubrication, it is not necessary to connect a grease gun to a dirty lubrication port every time to supply grease, so that the infiltration of moisture and contamination into the bearing can be prevented. 5) Manual feeding work by human power and the associated dangerous work can be eliminated. 6) The automatic grease lubricator has a long life, so that the maintenance cycle of the bearing can be extended. 7) As the expansion agent expands, the pressing plate is pushed up, and the air supply cylinder rises accordingly, so that air containing moisture can be supplied to the expansion agent through the air supply hole, so that the expansion agent continues to expand and grease can be supplied to the end.

[0012] The effects of the second solution are: 1) the grease is filled in an elastic grease container beforehand, making it easy to store in a cylindrical container; 2) the male thread of the discharge pipe of the grease container is screwed into the female thread of the discharge pipe of the grease cylinder, so the grease container can be securely sealed to the discharge pipe; and 3) by making the grease container bellows-shaped, the bellows can be neatly folded vertically without spreading out horizontally when the grease container is compressed, so the grease can be efficiently pushed out.

[0013] The effects of the third solution are: 1) the auxiliary cylinder can rise together with the expansion agent, preventing deformation of the cylindrical container, maintaining the sealing performance of the sealing plate, and guiding the sealing plate to its upper limit, and 2) the reinforcing cylinder can restrain the force of the expansion agent expanding the cylindrical container in the radial direction, suppressing deformation of the cylindrical container and preventing grease leakage. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional view of an automatic grease lubricator with a cylindrical container filled with grease. [Diagram 2] A cross-sectional view of an automatic grease lubricator in the middle of extruding grease. [Diagram 3] Detailed view of part a in Figure 2. [Figure 4] FIG. 4 is a cross-sectional view showing a state in which the cylindrical container is restrained by bolts. [Diagram 5] FIG. [Figure 6] FIG. 13 is a cross-sectional view of an embodiment of an automatic grease lubricator provided with an auxiliary cylinder and a reinforcing cylinder. [Figure 7] FIG. 2 is a cross-sectional view of an automatic grease lubricator in which grease is filled into a bellows container. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to claims 1 to 3 and Figs.

[0016] The first solution, as shown in claim 1, is an automatic grease lubricator 10 in which an expansion agent 70 and grease 80 are arranged on both sides of a cylindrical container 20 with a seal plate 60 between them. An upper lid 30 having a discharge pipe 31 for discharging grease is provided on an end face 20a of the cylindrical container 10 on the grease side, and a lower lid 40 is provided on an end face 20b of the cylindrical container 20 on the expansion agent side. The upper lid 30 and the lower lid 40 are fixed to the cylindrical container 20 with a bolt 90. A plurality of vent holes 41a are provided in the lower lid 40, and a vent tube 41 with openings at both ends is vertically attached. The vent tube 41 has a plurality of supply holes 41a. The expansion agent 70 is inserted into an air supply cylinder 51 having an air hole 51a formed therein, and the air supply cylinder 51 is attached vertically to a piston plate 50 for pushing up the seal plate 60. The expansion agent 70 is filled in a space 70a formed by the piston plate 50 and the bottom cover 40. Air taken in from the air vent cylinder 41 enters the air supply cylinder 51 through the air vent 41a and is absorbed by the expansion agent 70 through the air supply hole 51a of the air supply cylinder 51. The moisture contained in the air expands the expansion agent 70, which pushes up the piston plate 50 and discharges the grease 80. This is an automatic grease lubricator 10.

[0017] 1, the cylindrical container 20 has openings at both ends 20a, 20b, and bolts 90 are inserted through a plurality of through holes 32, 42 provided in the top lid 30 and the bottom plate 40 to clamp and secure the cylindrical container 20, thereby forming a hermetically sealed state. Sealing material 21 is fitted between the bottom surface 30b of the top lid 30 and the top end surface 20a of the cylindrical container 20, and between the top surface 40b of the bottom lid 40 and the bottom end surface 20b of the cylindrical container 20 to improve sealing performance.

[0018] 3, by minimizing the gap g between the bolt 90 and the cylindrical container 20, it is possible to suppress radial expansion of the cylindrical container 20 due to the expansion of the expansion agent 70. Since the strength of the cylindrical container 20 can be reinforced and radial deformation can be suppressed, the sealing performance of the sealing plate 60 can be maintained.

[0019] The cylindrical container 20 can be made of a carbon steel pipe, a stainless steel pipe, or a resin pipe such as polyvinyl chloride resin, which can be cut to an appropriate length to suit the volume of the expanding agent 70 or grease 80 .

[0020] A discharge pipe 31 is attached to the top cover 30. The discharge pipe 31 can be attached to the top surface 30a of the top cover 30 by welding 24b, screwing, etc. The discharge pipe 31 is provided with a male thread 31a, which can be connected to a female thread of a grease nipple or the like.

[0021] The bottom cover 40 is provided with a plurality of ventilation holes 41a and an air supply cylinder 41 with both ends open is attached substantially vertically. The ventilation cylinder 41 is covered with an air supply cylinder 51 with a plurality of air supply holes 51a. The air supply cylinder 51 is attached substantially vertically to the piston plate 50. The diameters of the ventilation holes 41a and the air supply holes 51a are 1 to 5 mm. If they are smaller than 1 mm, the expansion agent will clog and the air flow will be poor. If they are larger than 5 mm, the expansion agent 70 will infiltrate the ventilation cylinder 41 and the air supply cylinder 51. It is preferable that the diameter is 3 mm. The number of the ventilation holes 41a and the air supply holes 51a is in the range of 10 to 50. The discharge amount of the automatic grease lubricator 10 changes depending on external conditions such as temperature and humidity, so the discharge amount can be adjusted by changing the number of holes depending on the installation location. For example, the amount of air can be adjusted by sticking a seal or the like to the air supply hole 51a or the ventilation hole 41a to block the air.

[0022] 2 shows the state where the expansion agent 80 expands and pushes up the piston plate 50, the seal plate 60, and the grease 80. The air supply cylinder 51 and the vent cylinder 41 are connected to the center of the expansion agent 70, and when the expansion agent expands and pushes up the piston plate, the air supply cylinder also rises at the same time. The vent cylinder 41 is fixed to the bottom cover 40 and does not rise, but supplies air to the expansion agent 70 and the intake cylinder 51 below. Air is supplied to the expansion agent 70 from the air supply hole 51a, allowing expansion to continue.

[0023] 1 and 2 show the air flow inside the cylindrical container 20. Air taken in from the vent tube 41 passes through the vent hole 41a and enters the supply tube 51, then passes through the air supply hole 51a and is absorbed by the expansion agent 70, causing the expansion agent 70 to expand. As shown in Fig. 2, when the expansion agent 70 expands, the piston plate 50 and the supply tube 51 rise, but since the ventilation path is maintained by the vent tube 41, the air supply continues to the end, the expansion of the expansion agent 70 progresses, and the green 80 is pushed out.

[0024] A level gauge attachment part 50a is provided in the center of the piston plate 50, and a level gauge 53 is suspended by a wire 52 or string 52. A thin plate such as a resin plate or copper plate, or a resin string is suitable for the level gauge 53. As the piston plate 50 rises, the level gauge 53 is pulled up, so the amount of grease 80 that has decreased can be accurately detected.

[0025] FIG. 1 shows a cross-sectional view of the seal plate 60. The seal plate 60 is made of an elastic rubber plate. Examples of rubber plates include natural rubber (NR), styrene butadiene rubber (SBR), chloroprene rubber (CR), acrylonitrile rubber (NBR), butyl rubber (IIR), ethylene propylene rubber (EPDM), urethane rubber (U), and silicone rubber (Si). By making the seal plate 60 out of a rubber plate, the characteristic of the rubber plate being compressed and deformed by a vertical pressure and deforming and stretching in the horizontal direction is utilized. If a groove 60a is formed on the side surface 60b of the seal plate 60 and an O-ring 61 is attached, the sealing performance is improved.

[0026] The thickness of the seal plate 60 is preferably 15 to 30 mm. If it is thinner than 15 mm, the sealing performance is reduced. If it is thicker than 30 mm, the Poisson deformation in the radial direction is small, and the sealing performance is reduced. A thickness of about 20 mm is preferable.

[0027] In the case of a combination of a seal plate 60 and an O-ring 61 made of hard resin or metal as in the conventional case, the sealing performance of the O-ring 61 changes subtly depending on the manufacturing accuracy of the seal plate 60 and the expansion amount of the cylindrical container 20. For example, since the cylindrical container 20 is made of a thin metal plate or hard resin, the viscosity of the grease 70 differs between the daytime in midsummer and the nighttime in midwinter, causing a change in back pressure and resulting in a different expansion amount of the cylindrical container 20. In addition, when the cylindrical container 20 is press-manufactured, it is difficult to mold it into a perfect circle, and a seal made by combining a highly rigid seal plate 60 made of metal or hard resin with an O-ring 61 cannot follow the deformation and cannot prevent localized leakage. In order to follow such changes in the amount of expansion, a sealing function that applies the Poisson deformation of the seal plate 60 made of an elastic body as in the present invention is essential. If a groove 60a is formed on the outer peripheral side surface 60b of the elastic seal plate 60 and an O-ring 61 is fitted therein, the sealing performance is improved.

[0028] The sealing performance of the seal ring 60 with the O-ring 61 attached as shown in FIG. 4 will be described. The amount of radial expansion δ of the seal plate 60 due to the expansion and pressurization of the expansion agent 70 is shown. If the thickness of the seal plate 60 is t1, the thickness of the seal plate after pressurization is t2, the diameter of the seal plate 60 is s1, the diameter of the seal plate 60 after pressurization is s2, and the Poisson's ratio of the seal plate 60 is ν, then δ=s2-s1={(t1-t2) / t1} / (ν / s1). As the expansion agent 70 expands, the seal plate 60 is pressurized from above and below and compressed vertically, expanding radially at the Poisson's ratio. Even if the cylindrical container 20 formed of a thin plate expands and deforms in the radial direction, the seal plate 60 deforms in accordance with the amount of deformation, so that a reliable seal can be obtained.

[0029] For example, since the Poisson's ratio of rubber is generally about 0.5, when the sealing plate 60 is compressed by 1 mm, it will expand laterally by about 0.5 mm. By expanding the sealing plate 60 laterally at the Poisson's ratio, the grease 70 can be supplied to the bearing at an appropriate pressure without leaking even if the cylindrical container 20 expands.

[0030] As shown in Fig. 5, a space 50b can be formed by attaching an auxiliary cylinder 54 with an opening on one side to the piston plate 50. Workability is improved because the space 50b can be filled with the expansion agent 70 before placing it on the cylindrical container 20. The auxiliary cylinder 54 can suppress deformation of the cylindrical container 20 due to the expansion agent.

[0031] By attaching the reinforcing cylinder 43 to the bottom cover 40, the auxiliary cylinder 54 can be prevented from being deformed in the radial direction due to the expansion of the expansion agent 70.

[0032] The expanding agent 70 is a compound mainly composed of calcium oxide (CaO). It utilizes the property that calcium oxide forms calcium hydroxide (Ca(OH)2) through a hydration reaction, and grows into long, anisotropic hexagonal plate-shaped crystals over time, thereby increasing in volume. Examples of expanding agent products include Blaister (Taiheiyo Cement Co., Ltd.), S-Mite (Sumitomo Osaka Cement Co., Ltd.), and HP Rocktone (Kawai Lime Industry Co., Ltd.). By appropriately combining these products with calcium oxide, an expanding agent suitable for the bearing environment can be prepared.

[0033] The amount and speed of expansion can be adjusted by mixing 1-5% by weight of a powder of a deliquescent substance with calcium oxide. Less than 1% by weight has little effect. More than 5% by weight has too fast an expansion speed that is difficult to control. Deliquescent substances include citric acid (C6H8O7), sodium hydroxide (NaOH), potassium carbonate (K2CO3), and magnesium chloride (MgCL2).

[0034] The second solution, as shown in claim 2, is an automatic grease lubricator 10 in which an expansion agent 70 and a grease 80 are arranged on both sides of a cylindrical container 20 via a piston plate 50, an upper lid 30 having a discharge port 30a is provided on an end face 20a of the cylindrical container 20 on the grease 80 side, and a lower lid 40 is provided on an end face 20b of the cylindrical container 20 on the expansion agent 70 side, the upper lid 30 and the lower lid 40 are fixed to the cylindrical container 20 with a bolt 90, a vent tube 41 having a plurality of vent holes 41a and open at both ends is vertically attached to the lower lid 40, the vent tube 41 is inserted into an air supply tube 51 having a plurality of air supply holes 51a, the air supply tube 51 is vertically attached to the piston plate 50, and the expansion agent 70 is formed by the piston plate 50 and the lower lid 40. In the automatic grease lubricator 10, grease 80 is filled in a space 70a formed by a bellows-like elastic container 81 that can expand and contract, and the elastic container 81 is provided with a discharge pipe 82 having a male thread and is inserted into the discharge port 30b of the top lid 30, a fixing nut 83 is screwed onto the discharge pipe 82, and the elastic container 81 is fixed to the top lid 30 by sandwiching the top lid 30 with the fixing nut 83.

[0035] 2, the grease container 81 is made of a resin elastic body such as polyvinyl chloride, has a bellows shape, and can be freely compressed in the vertical direction. The grease container 81 is equipped with a discharge pipe 82 with a male thread, and is inserted into the discharge port 30b provided in the top lid 30. A nut 83 is screwed onto the discharge pipe 82, and the discharge pipe 82 is tightened and fixed to the top lid 30.

[0036] The grease container 81 is compressed by the piston plate 50 which receives an upward force due to the expansion of the expansion agent 70, and is pushed out from the discharge pipe 82.

[0037] The third solution is an automatic grease lubricator 10, characterized in that an auxiliary cylinder 54 having an opening on one side is attached to the piston plate 50 described in claim 1 or claim 2, and a reinforcing cylinder 43 having an opening on one side is attached to the bottom cover 40, as shown in patent claim 3.

[0038] 5, a space 50b that is open on one side can be formed by the piston plate 50 and the auxiliary cylinder 54, and this space 50b can be filled with the expansion agent 70. After the expansion agent 70 is filled in the space 50b, the cylindrical container 20 can be placed thereon, improving workability.

[0039] The auxiliary cylinder 54 can be made of a metal plate or a resin plate. The auxiliary cylinder 54 can be fixed to the piston plate 50 by welding or adhesive. The auxiliary cylinder 54 can reduce the force of the expanding agent 70 expanding the cylindrical container 20 in the radial direction.

[0040] The reinforcing cylinder 43 is a metal cylinder that is open on one side and is attached by welding to the bottom cover 40. The reinforcing cylinder 43 reduces the direct pressure of the expansion agent 70 and the auxiliary cylinder 54 against the cylindrical container 20, thereby suppressing deformation. [Explanation of symbols]

[0041] 10: Automatic grease lubricator 20: Cylindrical container 20a: End face 20b: End face 30: Upper lid 31:Discharge pipe 32:Through hole 40: Lower lid 41: Ventilation tube 41a: Ventilation hole 42:Through hole 43: Reinforced cylinder 50: Piston plate 50a: Mounting part 50b: Space 51: Air intake cylinder 51a: Air supply hole 52: I 53: Level gauge 54: Auxiliary cylinder 60: Seal plate 60a: Groove 60b: Side 61: O-ring 70: Leavening agent 80: Grease 90: Bolt

Claims

1. 1. An automatic grease lubricator in which an expansion agent and grease are disposed on both sides of a cylindrical container via a sealing plate, the cylindrical container has an upper lid provided with a discharge pipe for discharging grease on its end face on the grease side, and a lower lid provided with its end face on the expansion agent side, the upper lid and the lower lid are fixed to the cylindrical container with bolts, the lower lid has a plurality of vent holes formed therein and a vent cylinder with open ends is attached vertically, the vent cylinder is inserted into an air supply cylinder having a plurality of air supply holes, the air supply cylinder is attached vertically to a piston plate for pushing up the sealing plate, the expansion agent is filled in a space formed by the piston plate and the lower lid, air taken in from the air supply cylinder enters the air supply cylinder through the air vent holes, and is absorbed by the expansion agent through the air supply hole of the air supply cylinder, the expansion agent is expanded by moisture contained in the air, and the piston plate is pushed up to discharge the grease.

2. In an automatic grease lubricator in which an expansion agent and grease are disposed on both sides of a cylindrical container via a piston plate, an upper lid having a discharge port is provided on the end face of the cylindrical container on the grease side, and a lower lid is provided on the end face of the cylindrical container on the expansion agent side, the upper lid and the lower lid are fixed to the cylindrical container with bolts, a vent tube having a plurality of vent holes and open at both ends is vertically attached to the lower lid, the vent tube is inserted into an air supply tube having a plurality of air supply holes, the air supply tube is vertically attached to the piston plate, the expansion agent is filled in a space formed by the piston plate and the lower lid, In the automatic grease lubricator, air taken in from the vent cylinder enters the air supply cylinder through the air vent hole, and is absorbed by the expansion agent through the air supply hole, causing the expansion agent to expand with moisture contained in the air and push up the piston plate to discharge the grease. The automatic grease lubricator is characterized in that the grease is filled in a stretchable bellows-shaped elastic container, the elastic container has a discharge pipe with a male thread and is inserted into the discharge port of the top lid, a fixing nut is screwed onto the discharge pipe, and the elastic container is fixed to the top lid by sandwiching the top lid with the fixing nut.

3. 3. The automatic grease lubricator according to claim 1, further comprising an auxiliary cylinder having an opening on one side attached to said piston plate and a reinforcing cylinder having an opening on one side attached to said bottom cover. Beginning of the form

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