JPS6230309B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Generally, as a device for supplying relatively high viscosity lubricating oil such as grease to multiple oil supply parts of a vehicle, etc.
There is a single-tube terminal type air-type refueling device. This branches air pressure, which is the operating source for various control mechanisms installed in vehicles, to operate actuators such as air-driven pumps (hereinafter referred to as air-type pumps), and pre-greases them. Grease stored in a reservoir is supplied to the required location via a distribution valve, as shown in Figure 1.
A solenoid valve V used for branching and switching the supply air, an air pump P, a grease reservoir R, and a distributor D for distributing grease are each installed separately on a bracket or vehicle frame, and each element device is connected to a hose or tube. connected by. In this device, when a solenoid valve V is energized by pressing a push button switch S on a panel of the driver's seat, compressed air is sent from an air tank T to an air pump P via the solenoid valve V. This sent compressed air acts on a large-diameter piston in the air pump P, increases the pressure of a small-diameter plunger that engages with the piston by using the difference in pressure receiving area, and moves it forward against the spring. Grease from the grease reservoir R is fed to the oil supply section O via piping p ₁ such as a hose or tube, and a distributor D. Then, when the pressure switch _S1 is turned ON, the solenoid valve V operates to cut off the compressed air from the air tank T and release the compressed air in the cylinder of the air pump P to the atmosphere. The plunger is moved back by the spring, and grease is sucked into the pump P from the grease reservoir R in preparation for the next lubrication.

However, in the conventional oil supply device as mentioned above,
Because solenoid valves, air pumps, grease reservoirs, etc. are connected by piping such as hoses, the overall size is large, and the hassle of piping the hoses and the suction of the air pump due to the piping resistance of the hoses. Due to the reduction in power, the suction time from the grease reservoir to the air pump becomes longer, and when the temperature drops and the viscosity of the grease increases, especially in winter or at low temperatures, the suction time becomes longer and the lubrication interval becomes longer. .

The present invention eliminates the drawbacks of the prior art described above,
The purpose is to reduce the overall shape and shorten the time required to suck grease into the air pump without increasing the spring load of the air pump.

In order to achieve the above object, the present invention provides an air pump consisting of a two-position, three-way type solenoid valve, a large-diameter piston, and a small-diameter plunger that operate by increasing air pressure by utilizing a difference in pressure-receiving area. The main body has a grease discharge hole and a suction hole with a check valve inside, and a tank that houses a grease reservoir formed in the shape of a flexible bag is integrated, and the air discharge hole of the solenoid valve is integrated. It is characterized in that it is connected to the tank without being exposed to the atmosphere, and that the tank is provided with a throttle hole that opens to the outside air.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a sectional view showing an embodiment of the grease pump of the present invention, and 1 is a two-position, three-way type solenoid valve, which has an air inlet 1a, an air outlet 1b, and an air discharge hole 1c. The electromagnetic valve 1 is a known one, and its internal structure includes a spring 12 in the center of an electromagnetic coil 11, as shown in FIG.
A valve body 13 is provided so as to be slidable in the vertical direction, and the lower end of the valve body 13 is connected to the valve chamber 1 which communicates with the air inlet 1a and the air outlet 1b.
A valve stem 16 is attached to the upper part of the valve body 13, and the upper end of the valve stem 16 is seated on a valve seat 17 provided in the air discharge hole 1c. . Further, gaps are formed in the periphery of the valve body 13 and the periphery of the valve stem 16, and the valve chamber 14 passes through these gaps to form the air discharge hole 1c.
It is configured to communicate with.

On the other hand, in the main body 2b connected to the solenoid valve 1 in FIG. The pneumatic pump 2 is formed by constantly engaging a small diameter plunger 3 that operates by increasing air pressure by using the return spring 3a, and the large diameter piston 2
A is fitted into the inner surface of the main body 2b corresponding to the first cylinder, and the small diameter plunger 3 is fitted into the second cylinder 3c formed inside the main body 2b.

Further, a grease discharge hole 2c is formed in the upper side of the main body 2b, and a suction hole 2d equipped with a check valve 3b is formed in the center of the upper wall. , a plunger working chamber 3 formed by the plunger 3 and the second cylinder 3c.
It is connected to d.

A tank 4 is connected above the main body 2b with bolts and nuts, and an opening is formed in the tank 4 by a flexible elastic material such as polyethylene to store grease therein. The grease reservoir 5 formed in the shape of a bellows-shaped bag has
The opening portion is installed inside the main body 2b so as to be joined to the outer peripheral portion of the suction hole 2d portion, and further,
The inside of the tank 4 and the air discharge hole 1c of the solenoid valve
The tank 4 is connected by a pipe 6, and the tank 4 is provided with a throttle hole 4a that is open to the outside air.

Next, to explain the operation, by pressing the push button switch on the driver's seat panel, the solenoid valve 1 is activated, and compressed air is passed from the air inlet 1a to the air outlet 1b to the large diameter piston 2a of the air pump 2.
When the pressure is applied to the small diameter plunger 3 that is engaged with the plunger 3, an increased pressing force is applied upward in inverse proportion to the pressure receiving area ratio, so that the grease in the plunger working chamber 3d that constitutes the pump chamber is The grease is fed under pressure to an external oil supply section through the grease discharge hole 2c. At this time, the suction hole 2d is closed by the check valve 3b.

Next, when the solenoid valve 1 is turned off by, for example, releasing the push button switch, the air inlet 1a and the air outlet 1b are cut off, and the air outlet 1b and the air discharge hole 1c are communicated (FIG. 3 shows this state). . Therefore, the piston 2a and plunger 3 in the air pump 2
is pushed back and lowered by the action of the return spring 3a. Along with this, the piston 2a
Since the air below is pushed out into the tank 4 through the air discharge hole 1c and the piping 6, the grease reservoir 5 housed in the tank 4 is pressed from the outer periphery.
The internal grease is pushed out to the plunger operating chamber 3d via the check valve 3b.

As described above, in combination with the suction effect due to the retreating action of the plunger 3, the time for sucking the grease during the downward (suction) stroke of the plunger 3 can be shortened. Note that the air pushed into the tank 4 is gradually released to the outside air through the throttle hole 4a, so during the next upward (discharge) stroke of the plunger 3, the check valve 3b closes the suction hole 2d. There is no effect.

As explained above, according to the present invention, since the solenoid valve, the air pump, and the tank containing the grease reservoir are integrated, the overall shape can be reduced, and the spring load can be reduced. Since the suction time during the downward stroke of the plunger 3 can be shortened, oil can be refilled in a short time.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a conventional air-type oil supply system, Figure 2
The figure is a longitudinal cross-sectional view showing an embodiment of the grease pump according to the present invention, and FIG. 3 is a cross-sectional view of a solenoid valve. 1...Solenoid valve, 1a...Air inlet, 1b...Air outlet, 1c...Air discharge hole, 2...Air pump, 2a...Piston, 2b...Main body, 2c...
Grease discharge hole, 3...plunger, 3b...check valve, 4...tank, 4a...throttle hole, 5...grease reservoir.

Claims (1)

[Claims] 1. A solenoid valve having an air inlet, an air outlet, and an air discharge hole, and a large-diameter piston that is pressed by air pressure from the air outlet of the solenoid valve, and increases the air pressure by using the difference in pressure receiving area. A main body forming an air pump having a small-diameter plunger that operates as a pump, and having a grease discharge hole and a suction hole having a check valve therein, each communicating with the working chamber of the plunger constituting a pump chamber. a grease reservoir formed into a bag shape with one opening by a flexible elastic material that stores grease therein; and the opening of the grease reservoir is connected to the suction hole of the main body. the solenoid valve, the main body, and the tank are integrated, the air discharge hole of the solenoid valve is connected to the tank, and the tank is provided with a throttle hole that opens to the outside air. Grease pump with centralized lubrication system.