JPS6321834Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a plunger type grease supply device that supplies grease to sliding surfaces such as bearings.

2. Description of the Related Art A grease supply device is a device that uses a plunger type pump to forcibly supply grease to a large number of lubricated parts, and is often used, for example, to lubricate bearings in vehicles.

A conventional example of this type is Japanese Utility Model Application No. 58-89692. In this example, the main body is provided with a large-diameter air cylinder and a small-diameter oil cylinder 21 with the same axis on the left side thereof. air cylinder 1
A cup-shaped piston fitted with a ring packing is disposed inside the cylinder 8 so as to be slidable in the left and right direction, and a plunger 20 is fitted into the oil cylinder 21.
The plunger 20 and the oil cylinder 21 form a pump chamber.

The plunger 20 is brought into contact with the piston by a return spring 23 that is elastically loaded between the main body and a spring seat provided at the right end of the plunger, and the piston is always urged to the right as shown in the figure. It's in a good position.

The right end surface of the air cylinder 18 has a supply passage connected to an air pressure source via a solenoid valve 17. When the solenoid valve 17 is opened and compressed air is supplied, the compressed air acts on the piston. Then, the piston is displaced to the left against the return spring 23, so that the grease previously introduced into the pump chamber is supplied from the discharge passage 22 to each oil supply location. When the supply is completed, the solenoid valve 17 is closed, and the plunger 20 is returned to its original position by the return spring 23. During the return stroke, grease is drawn into the pump chamber from the grease container 1, and the next grease is drawn into the pump chamber. Preparations are made for supply.

In such a grease supply device, the electromagnetic valve 17 has a structure as shown in FIG.
The air passage 31 connected to the right end surface of the air cylinder 18 mentioned above has a valve body movable chamber 32 described below and a connection port 33 connected to an air pressure source, and the valve body movable chamber 32 is connected to the valve body movable chamber 32 on the connection port 33 side. It has a supply side valve seat 34 that protrudes to the side, and an exhaust side valve seat 3 at an upper position facing the valve body movable chamber 32 and opposing the supply side valve seat 34.
5 is formed.

The valve body 36 is located within the valve body movable chamber 32, is provided with a rod 37, has seat surfaces formed on its upper and lower surfaces, and has a spring 38 between it and the lower surface of the valve body movable chamber 32. It is loaded with bullets. This valve body 36 is in contact with a plunger 39, which will be described below, via a rod 37. This plunger 39
The lower end abuts against the rod 37 as described above, and the upper end abuts against a spring 41, one end of which is accommodated in a spring accommodating hole 40 formed in the axial direction.

Further, the plunger 39 is arranged in a plunger movable chamber 43 formed at the center of a coil 42 and having a magnetic rod 44 inserted into the upper end thereof, and when the coil 42 is excited, it is displaced against the spring 41. , the valve pair 36 moves from the supply side valve seat 34 to the exhaust side valve seat 3
The contact position is switched to 5.

Note that 45 is a terminal for power supply.

Problems to be Solved by the Invention In such a solenoid valve 17, the plunger 39 has a spring storage hole 40 formed in the center, so there is a magnetic loss corresponding to that amount, and a coil is used to compensate for the loss. Since the amount required, the coil 42 had to be large.

Therefore, the purpose of this invention is to eliminate the magnetic loss of the plunger.

Means to Solve the Problems The gist of this invention is to attach a diaphragm to the opposite end of the plunger that slides inside the cylinder, fix the open end of the diaphragm to the main body, and use the diaphragm to connect the plunger to the opposite end of the cylinder. In a grease supply device that constitutes a pneumatic chamber, and the supply of air pressure to the pneumatic chamber is controlled via a solenoid valve, the solenoid valve has a valve body that moves up and down, and a valve body that can be selectively moved by this displacement. A supply side valve seat and an exhaust side valve seat are seated, a plunger abuts on a rod integrated with the valve body, and the valve body is pressed against the supply side valve seat through the plunger. a spring whose one end engages with an annular groove formed on the outside near the lower end on the valve body side of the plunger and whose other end abuts against the lower end side of the coil; and a coil which displaces the plunger against this spring. It consists of more than one thing.

Function: Therefore, there is no need to form a spring storage hole in the axial direction of the plunger of the solenoid valve, and the magnetic efficiency of the plunger is improved accordingly, making it possible to reduce the amount of coils. It is something.

Embodiments Hereinafter, embodiments of this invention will be described with reference to the drawings.

1 and 2, the grease supply device will be explained first. The main body 1 of the grease supply device is made of resin, and has a left part 1a and a right part 1b separated by a longitudinal cut surface 2, which are connected by screws 3 and nuts 4. Inside the main body 1, a large diameter diaphragm movable chamber 5 is provided on the right side in FIG. A cylinder 6 is formed, and the right side of the cylinder 6 projects into the diaphragm movable chamber 5. The cylinder 6 is composed of a resin portion 6a and a metal sleeve 6b disposed inside the resin portion 6a, and the sleeve 6b is molded when the main body 1 is molded.

Inside this cylinder 6 is a metal plunger 8.
The left end portion of the plunger 8 and the cylinder 6 form a pump chamber 9. This plunger 8 is made up of a retainer 10 with a bowl-shaped portion facing the cylinder 6 at its right end, a diaphragm 12 (described below) that wraps around the retainer 10, and a presser fitting 13 that presses the diaphragm 12, which are fixed with screws 11. There is. A return spring 14 is provided between the retainer 10 and the left end of the diaphragm movable chamber 5.
is loaded, the plunger 8 is always urged to the right, and when the plunger 8 is not operating, it is at the right end.

The diaphragm 12 is made of cloth coated with resin or rubber, and its open end 16 is attached so as to be sandwiched between the left part 1a and the right part 1b that constitute the main body 1. The attachment method is to fold the open end 16 back 180 degrees from the bowl body. Therefore, the diaphragm 12 appears in a state in which the sides of the bowl body are bent at a steep angle. Note that as the plunger 8 is displaced, the bent position shifts.

The diaphragm 12 returns the diaphragm movable chamber 5 to the left side, forming a spring chamber 5a and a pneumatic chamber 5b on the right side, and an air passage 17 connected to an unillustrated air pressure source is opened in the pneumatic chamber 5b. A solenoid valve 18 is provided in this passage 17, and by opening and closing the solenoid valve 18, the pneumatic chamber 5b can be opened to the atmosphere or connected to an air pressure source.

The pump chamber 9 formed by the cylinder 6 and the plunger 8 has a suction port 20 and a discharge port 21.
is connected to the suction port 20, and a check valve 22 is connected to the suction port 20.
is arranged and communicated with a grease container 26 described below. On the other hand, the discharge port 21 is connected to a grease supply destination via a distributor (not shown).

A grease storage section 23 is provided at the upper part of the grease supply device main body 1, and the grease storage section 23 is connected to a holder 24 (not shown) screwed to the main body 1.
and the protective case 2 fitted into this holder 24.
5 and a grease container 26 housed within the container. At the center of the holder 24, there is a threaded part 27 that projects upward, and the threaded part 27 side is connected to the main body 1.
A replenishment port 28 is provided which communicates with the suction port 20 of. By screwing the grease container 26 into the threaded portion 27 with the mouth 29 of the grease container 26 facing downward, the grease container 26 is fixed, and at the same time, the tip of the replenishment port 28 is connected to the lid 30 of the grease container 26. The inside of the grease container 26 and the pump chamber 9 of the main body 1 are thereby communicated with each other.

In the above configuration, the grease supply device operates as follows. Here, the pump chamber 9 is supplied with grease in advance, and the plunger 8
It is assumed that has been restored to the state shown in FIG. To supply grease, when the solenoid valve 18 is operated to guide compressed air to the pneumatic chamber 5b, the pressure in the pneumatic chamber 5b increases, and the plunger 8 is moved by the return spring 1.
4 and is pushed to the left. This plunger 8
Due to this movement, the grease filled in the cylinder 6 is pressurized and is discharged from the discharge port 21. Grease discharged from the discharge port 21 is supplied to each lubricated portion via a distribution chamber (not shown).
When the supply of grease is finished, the electromagnetic valve 18 is de-energized and the compressed air in the pneumatic chamber 5b is discharged to the atmosphere. As a result, the plunger 8 is urged to the right by the action of the return spring 14, and as the plunger 8 returns, grease is sucked into the pump chamber 9, preparing for the next supply.

In this way, the grease supply device is operated using the compressed air supplied to the pneumatic chamber 5b as a driving force, and the solenoid valve 1 controls the supply of the compressed air.
8 has the following configuration.

The solenoid valve 18 is located on the right side 1 of the grease supply device main body 1.
The valve body movable chamber 32 placed above the valve body 36 and housing the valve body 36 forms the air passage 17 with a connection port 33 connected to an air pressure source (not shown).

The valve body movable chamber 32 is connected to the connection port 33 below.
A supply side valve seat 34 is provided on the side, and an exhaust side valve seat 35 is provided on the upper side opposite to this, and a valve body 36
By displacing vertically, the valve seat is selectively seated on one of the valve seats to open and close the hole formed there.

The valve body 36 is shown in FIGS. 3 and 4 and is made of rubber or the like, and a rod 37 is inserted and fixed into the valve body 36. In both of these embodiments, the rod 37
In the case of FIG. 4, a holding piece 43 is arranged.

The plunger 39 is connected to the rod 37 at its lower end.
It is arranged in a plunger movable chamber 43 which is formed at the center of the coil 42 and has a magnetic rod 44 inserted into its upper end, and its upper end is flat and faces the lower surface of the magnetic rod 44. are doing. The plunger 39 has one end engaged with an annular groove 46 formed on the outside near its lower end, and a conical spring 41 whose other end is in contact with the lower end side of the coil 42 to supply the valve body 36. It is biased in the direction of pressing toward the side valve seat 34. In addition, 45,4
5 is a terminal for power supply.

As shown in the figure, when the coil 42 is in a de-energized state with no current flowing through it, the valve body 36 is moved by the spring 41 that presses the plunger 39 to the supply side valve seat 34.
Since the supply side is closed and the exhaust side is opened, the air pressure chamber 5b is opened to the atmosphere from an exhaust port (not shown). In this state, the pump chamber 9 is filled with grease in advance.

When the solenoid valve 18 is energized, the coil 42 of the solenoid valve 18 is energized and the plunger 39 is displaced upward, so the force applied to the valve body 36 is weakened, and the compressed air pushes up the valve body 36 and is exhausted. It flows into the air pressure chamber 5b while being pressed against the side valve seat 35.

Due to the inflow of compressed air, the pressure within the air pressure chamber 5b increases, and the plunger 8 is pushed to the left against the return spring 14. By this movement of the plunger 8, the grease filled in the cylinder 6 is pressurized and is discharged from the discharge port 21.
Then, the grease discharged from the discharge port 21 is supplied to each lubricated portion via a distributor (not shown).

When the supply of this grease is finished, the solenoid valve 1
8 is stopped, the holding force of the electromagnetic valve 18 to the plunger 39 is removed, and the valve body 36 is seated on the supply side valve seat 34 by the spring 41, stopping the pressure feeding of compressed air, and the exhaust side valve seat 35 is opened to discharge the compressed air in the air pressure chamber 5b to the atmosphere. As a result, the plunger 8 is urged to the right by the action of the return spring 14, and the plunger 8 returns to its original position.

Effects of the invention As described above, according to this invention, in the solenoid valve of the grease supply device, the upper end of the plunger is flat and faces the lower surface of the magnetic rod, and the facing area is large. Therefore, the magnetic attraction force is increasing. For this reason, it has the effect of reducing the number of coil turns (coil amount) of the solenoid valve compared to the conventional example.

This reduction in the amount of coils allows the outer shape to be made smaller.

In addition, the spring that biases the valve body of the solenoid valve is 1
This also has the effect of reducing the number of parts compared to the conventional example.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of this invention, Figure 2 is a sectional view showing an embodiment of this invention.
The figure is an enlarged sectional view of the essential parts of the same, FIGS. 3 and 4 are sectional views of the valve body, and FIG. 5 is a sectional view of a conventional electromagnetic valve. 5b... Pneumatic chamber, 6... Cylinder, 8... Plunger, 12... Diaphragm, 18... Solenoid valve, 34... Supply side valve seat, 35... Exhaust side valve seat,
36... Valve body, 37... Rod, 39... Plunger, 41... Spring, 42... Coil.

Claims (1)

[Scope of utility model registration request] A diaphragm is attached to the anti-cylinder side end of the plunger that slides inside the cylinder, the open end of the diaphragm is fixed to the main body, the diaphragm forms a pneumatic chamber on the anti-cylinder side, and the pneumatic chamber is equipped with a solenoid valve. In the grease supply device, the solenoid valve has a valve body that moves up and down, and a supply side valve seat and an exhaust side valve seat that are selectively seated by the movement of the valve body. a plunger that abuts a rod integrated into the valve body;
One end of the plunger is engaged with an annular groove formed on the outside near the lower end on the valve body side of the plunger so that the valve body is pressed against the supply side valve seat via this plunger, and the other end is engaged with the lower end of the coil. A grease supply device comprising a spring in contact with a side thereof and a coil for displacing the plunger against the spring.