JP2531629Y2 - Air compressor lubrication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an oil supply device for an air compressor.

(Prior Art) FIG. 5 shows a basic structure of a well-known air compressor. As a lubricating means for lubricating sliding surfaces such as a crankshaft 101 and an inner wall of a cylinder 102, FIG. As shown in the drawing, a method of supplying oil through an oil supply hole 104 formed of a throttle hole formed in a crankcase 103 or the like is widely known.

(Problems to be Solved by the Invention) However, the conventional technical means has a limit that dust is easily clogged when the flow passage area of the oil supply hole 104 is too narrow (usually, about 1.5 mm in diameter). On the other hand, if the flow passage area is too large, an unnecessarily large amount of oil is supplied into the air compressor, passes between the cylinder and the piston ring, and is discharged (or sometimes a suction valve).
There is a problem that the amount of oil flowing out from the tank increases.

In view of this point, in the present invention, with a simple configuration, it is possible to select a large hole diameter as a flow passage area of the oil supply hole so as not to cause a possibility of clogging with dust, and to set an appropriate amount so that the oil supply amount is not more than necessary. It is an object of the present invention to provide an air compressor refueling device capable of suppressing the oil supply.

(Means for Solving the Problems) In order to solve the above problems, the present invention forms a circumferential surface eccentric to the axis of the crankshaft on the outer circumferential surface of the crankshaft, An armature that is in sliding contact with the circumferential surface is disposed so as to be reciprocally movable, and a flow path connected to an oil supply pipe that pressure-feeds lubricating oil is formed inside the armature, and a downstream communication port is formed. The actuator is formed at a position that can be opened and closed by the reciprocating motion of the actuator itself, and a refueling hole opened in the crankcase is connected downstream of the communication port, so that the reciprocating motion of the actuator based on the eccentricity of the circumferential surface The opening and closing of the communication port causes the supply pressure from the oil supply pipe to intermittently supply oil into the crankcase via the oil supply hole.

(Operation) As described above, since lubricating oil is supplied to the air compressor intermittently, even if the diameter of the oil supply hole is set to be large, the amount of oil supply can be suppressed to an appropriate amount. That is, by adopting the intermittent refueling method, the refueling amount can be suppressed to an appropriate amount and the diameter of the refueling hole can be set to be relatively large, so that the problem that the refueling hole is clogged with dust as in the related art can be avoided.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing a main part of an embodiment of the present invention. The crankshaft 1 is rotatably supported by a crankcase 3 via left and right bearings 2,2. A circumferential surface 4 having a center eccentric with respect to the axis of the crankshaft 1 is formed on a part of the outer circumferential surface of the crankshaft 1, and an actuator described later slides on the circumferential surface 4. And is configured to reciprocate.

FIG. 2 is a longitudinal sectional view showing a valve mechanism for intermittently supplying pressure oil from an oil supply pipe. The main part of this valve mechanism is composed of an operator 5, a flow path 6 formed in the operator 5, an oil supply hole 7 formed in the crankcase 3, and a return spring 8. In the figure, 9 is a joint portion of an oil supply pipe connected to a known oil supply means such as an oil pump, 10 is a communication port formed on the downstream side of the flow path 6, C is the axis of the crankshaft 1, C ′ is the center of the circumferential surface 4. When the actuator 5 is retracted toward the crankcase 3 due to the eccentricity of the circumferential surface 4, that is, the actuator moves to the left in FIG. 2 and the communication port 10 is formed on the crankcase 3 side. 5, the oil supply hole 7 and the oil supply pipe communicate with each other through the communication port 10, so that the pressure oil from the oil supply pipe is supplied by the pressure to the oil supply hole 7. Is supplied to the inside of the crankcase 3. in this case,
By adjusting the ratio of the opening time in the opening and closing cycle of the communication port 10 by selecting the position of the communication port 10, the amount of eccentricity of the circumferential surface 4 and the amount of protrusion of the actuator 5, the supply amount of the lubricating oil is adjusted. It goes without saying that you can do it. Therefore, while the opening ratio of the communication port 10 is appropriately suppressed, the hole diameter of the oil supply hole 7 is set to be large, so that dust clogging can be avoided.

Next, the operation of this embodiment will be described. When the crankshaft 1 is rotated by driving means (not shown), the center C ′ of the circumferential surface 4 is aligned with the axis C of the crankshaft 1.
, The circumferential surface 4 rotates while being eccentric. Therefore, the actuator 5 slidingly contacting the circumferential surface 4 repeats reciprocating motion. As the actuator 5 reciprocates, the flow path 6 formed in the actuator 5 communicates with the oil supply hole 7 through the communication port 10 or is shut off. Thereby, the oil supply from the oil supply hole 7 is performed intermittently.

In this case, the timing at which the flow path 6 formed in the actuator 5 communicates with the oil supply hole 7, that is, the communication port 10
If the position of the center C 'of the circumferential surface 4 is set so that the timing at which the piston opens and the timing at which the piston passes through the bottom dead center coincide, the exposed cylinder inner wall portion below the piston is the smallest. Since lubrication is performed at the timing, excessive lubrication to the cylinder inner wall portion is suppressed, and the amount of oil rise can be reduced.

As described above, the amount of lubrication depends on the amount of eccentricity of the center C ′ of the circumferential surface 4, that is, the size of the stroke of the actuator 5 determined by the amount of eccentricity, the formation position of the communication port 10,
By selecting the amount of protrusion of the operator 5 and the like, the timing can be adjusted by setting the timing at which the flow path 6 of the operator 5 communicates with the oil supply hole 7. Further, the circumferential surface 4 is not limited to the forming position in the above embodiment, but may be formed at any position on the outer circumferential surface of the crankshaft 1, and the specific structure and the installation position of the valve mechanism are appropriately selected. be able to.

(Effects of the Invention) In the present invention, the following effects can be obtained as a result of employing the above configuration.

(1) Since refueling is performed intermittently and the amount of refueling can be suppressed to an appropriate amount, the degree of freedom for setting a large flow passage area of the refueling hole increases.

(2) Therefore, problems such as clogging of dust can be avoided by setting the flow passage area of the oil supply hole to an appropriate size.

(3) Since the eccentric circumferential surface formed by using the outer peripheral surface of the crankshaft is used as the driving means of the actuator, there is no need to provide any special driving means and the configuration is simple.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a main part in an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view showing a valve mechanism part in the embodiment, and FIG. 3 is an actuator in the embodiment. FIG. 4 is a sectional view showing a conventional example, and FIG. 5 is a longitudinal sectional view showing a basic structure of an air compressor. DESCRIPTION OF SYMBOLS 1 ... Crank shaft, 3 ... Crank case, 4 ... Circumferential surface, 5
... actuator, 6 ... flow path, 7 ... oil supply hole, 8 ... return spring, 10 ...
Communication port

Claims (1)

(57) [Scope of request for utility model registration] 1. An outer peripheral surface of a crankshaft is formed with a circumferential surface eccentric with respect to the axis of the crankshaft, and an operating element slidably contacting the circumferential surface is disposed on the crankcase side so as to be reciprocally movable. And a flow path connected to an oil supply pipe for feeding lubricating oil is formed inside the actuator, and a downstream communication port is formed in a portion that can be opened and closed by the reciprocating motion of the actuator itself. An oil supply hole opened in the crankcase is connected to a downstream side of the communication port, and the communication port is opened and closed by a reciprocating motion of an operator based on eccentricity of the circumferential surface, thereby supplying the oil from the oil supply pipe. An oil supply device for an air compressor, wherein oil is intermittently supplied into the crankcase through the oil supply hole by pressure.