Patent ID: 12241589

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, preferred embodiments according to the present disclosure will be described with reference to the attached drawings.

FIG.2is a cross-sectional view showing a lubricant injector according to a preferred embodiment of the present disclosure,FIG.3is a cross-sectional view showing the separation and assembly of a lubricant injector according to a preferred embodiment of the present disclosure, andFIG.4is a perspective view showing the separation and assembly of a screw shaft and a power transmission member according to a preferred embodiment of the present disclosure.

As shown inFIGS.2and3, the present disclosure is largely composed of a storage chamber10, a piston20, a screw shaft30, a main body40, a drive motor50, and a discharge conduit60.

The storage chamber10is intended to provide a space in which lubricating oil is filled, and is located on the upper side of the lubricant injector according to the present disclosure.

The piston20is provided inside the storage chamber10, and piston20is screw-coupled with the screw shaft30, so that the piston20may be raised and lowered within the storage chamber10as the screw shaft30rotates.

An insertion duct12coupled to an upper coupler, which will be described later, is further provided on the lower surface of the storage chamber10.

The main body40is located in the lower part of the storage chamber10. The main body40is provided with the drive motor50that drives the screw shaft30, and the discharge conduit60for discharging the lubricating oil to the outside.

Meanwhile, according to a preferred embodiment of the present disclosure, as shown inFIG.4, the screw shaft30is provided with a body portion31having a thread formed thereon, and a head portion36at the lower end thereof. The screw shaft30is also provided with an inlet hole32on the lower side thereof and an outlet hole34(seeFIG.3) on the bottom of the head portion36.

In this case, as shown inFIGS.2and3, since the body portion31is rotatably mounted through the storage chamber10, and the inlet hole32and the outlet hole34are in communication with each other through an internal flow passage38, when the lubricant injector operates, as the piston20descends, the pressurized lubricating oil flows into the inlet hole32and then flows out through the internal flow passage38and out through the outlet hole34.

The lubricant injector according to the preferred embodiment of the present disclosure further includes a power transmission member70that is located between the screw shaft30and the discharge conduit60to transmit the rotational force of the drive motor50to the screw shaft30.

At this time, the power transmission member70includes: a circular plate71; an upper coupler72at the center of the upper surface of the circular plate; a lower coupler74at the center of the lower surface of the circular plate; and a ring gear76on the bottom surface of the edge of the circular plate. At the center of the circular plate, a through hole78is formed that penetrates the upper coupler72and the lower coupler74.

As shown inFIG.4, the upper coupler72is intended to be fixedly coupled with the head portion36of the screw shaft30inserted therein. To this end, it is preferable that the head portion36is provided in a polygonal shape or a sawtooth shape, and the upper coupler72fixedly coupled to the head portion is provided in a corresponding shape.

That is, when the head portion36has a polygonal shape such as a triangle or square, and the upper coupler72into which the head portion36is inserted is also shaped to correspond to this shape, the head portion36may be inserted and fixed into the upper coupler72and rotated as a whole.

When the head portion36is shaped into a circle and teeth are formed on the edge thereof, and the upper coupler72into which the head portion36is inserted is also formed with teeth correspondingly, the head portion36may be inserted and fixed into the upper coupler72and rotated as a whole.

Meanwhile, as shown inFIG.2, the ring gear76with gear teeth formed on the inside thereof is provided on the lower edge of the circular plate71. The ring gear76is injection molded integrally with the circular plate71, but may be formed separately and detachably coupled to the circular plate71using screws, etc.

When the ring gear76is detachably coupled like this, in case the ring gear is worn, the ring gear76may be easily replaced by separating the ring gear76from the circular plate71. When all components such as the ring gear76and the circular plate71, as well as the upper coupler72and the lower coupler74, are injection molded as one piece, the production cost decreases.

The ring gear76is rotated by a pinion54linked to the drive motor, which will be described later, and as a result, the circular plate71may also be rotated.

The lower coupler74is inserted into the upper side of the discharge conduit60and rotatably coupled, and for this purpose, the lower coupler74is preferably formed to correspond to the shape of the discharge conduit60.

Thus, according to the lubricant injector of the present disclosure, by providing the ring gear76at the edge of the circular plate71so as to rotate by means of the pinion54, and allowing the screw shaft30to be fixedly coupled and rotated at the center of the upper surface of the circular plate71, the screw shaft may be rotated reliably even with a small torque.

Meanwhile, according to a preferred embodiment of the present disclosure, rotational force is transmitted from the drive motor50accommodated in the main body40through a reducer80to the final pinion54, and the drive motor50is controlled by electrical signals from a control panel (not shown).

The drive motor50is located on one side of the main body40in consideration of the discharge conduit60located at the center of the main body40, and the reducer80is located above the drive motor50and transmits rotational force to the final pinion54at an appropriate reduction ratio. As a result, the power transmission member70is rotatably coupled by the pinion54interlocked with the drive motor50and may finally transmit rotational force to the screw shaft30.

Meanwhile, according to a preferred embodiment of the present disclosure, as shown inFIG.3, after the discharge conduit60, the drive motor50, the reducer80, and the pinion54are placed inside the main body40, the lower coupler74on the lower surface of the power transmission member70is rotatably coupled to the upper side of the discharge conduit60, and the head portion36of the screw shaft30is fixedly coupled to the upper coupler72.

Next, after the screw shaft30is rotatably mounted through the storage chamber10, the piston20is coupled thereto, and finally, the screw shaft30is fixed to the main body40using the ring-shaped locking member90to complete the assembly.

Alternatively, the assembly sequence may be as follows. First, with the screw shaft30fastened to the storage chamber10and the piston20, the head portion36of the screw shaft30is fixedly coupled to the upper coupler72, and finally, the screw shaft30and the main body40are fixed to each other by the ring-shaped locking member90.

In this case, fastening may be easily accomplished because the insertion duct12that is coupled to the upper coupler72is protruding on the lower surface of the storage chamber10, and the inner part of the locking member90and the upper outer part of the main body40are designed to be screwed together, enabling easy fastening just by tightening.

In addition, it is preferable that an O-ring is provided on the outer periphery of the insertion duct12to block lubricating oil from escaping through the outlet hole34of the screw shaft30.

The operating process of the lubricant injector of the present disclosure configured as described above will be described in more detail as follows.

As shown inFIG.2, when the drive motor50controlled by the control panel (not shown) rotates, the motor speed is reduced by the reducer80to obtain an appropriate reduction ratio and the pinion54rotates, and the circular plate71, that is, the power transmission member70, also rotates very slowly by the ring gear76coupled with the pinion54.

At this time, because of the head portion36fixedly coupled to the upper coupler72on the upper surface of the circular plate71, the screw shaft30also rotates at the same speed and as a result, the piston20descends due to the rotation of the screw shaft30.

As the piston20descends in this way, the lubricating oil pressurized inside the storage chamber10sequentially flows through the inlet hole32of the screw shaft30to the internal flow passage38and the outlet hole34, and to the through hole78formed in the power transmission member70and the discharge conduit60and be injected into the final destination.

In this case, it is desirable that the inlet hole32formed on the lower side of the screw shaft30be located at the lowest possible inside of the storage chamber10so that the lubricating oil filled in the storage chamber10is completely discharged to the last remaining amount.

As described above, the basic technical idea of the present disclosure is to provide a lubricant injector that, by using a ring gear, may slowly rotate a screw shaft by maximally increasing the reduction ratio in an internal space of a provided lubricant injector with a predetermined size, and may strongly rotate the screw shaft to increase ejection pressure.

Furthermore, the basic technical idea of the present disclosure is to provide a lubricant injector that may reliably rotate a screw shaft even with a small rotational force of a pinion by providing a ring gear at the edge of a circular plate to allow the circular plate to rotate by means of the pinion, and by ensuring that the screw shaft is fixedly coupled to the center of the upper surface of the rotating circular plate.

The present disclosure may be modified in various ways by those skilled in the art within the scope of the basic technical idea of the present disclosure.