JPS6221777Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spring clutch/brake lubrication device.

Spring clutches/brakes are capable of highly accurate rotational control, and have conventionally been used as shown in FIGS. 1a and 1b and 2a to 2d. That is, the first sleeve 2 shown in the figure is constantly applied with a rotational force from the outside, and when it is necessary to transmit the rotational force to the shaft 1, a stopper 6 protruding from the outer peripheral surface of the spring case 5 is used.
When the spring 4 is displaced in the circumferential direction by an electromagnetic solenoid (not shown), the spring 4 is wound around the first sleeve 2, so that rotational force is transmitted to the shaft 1 via the spring 4 and the second sleeve 3. .

However, the first sleeve 2, the second sleeve 3, the spring case 5 and the spring 4
The precision of the spring clutch/brake is extremely high, but because the structure of the spring clutch/brake makes it difficult to lubricate, the precision of each of the above parts decreases due to wear, making it difficult to maintain a long service life.

The present invention was devised in view of the above circumstances, and its purpose is to facilitate lubrication and extend the life of the spring clutch by automatically supplying the appropriate amount of oil with an appropriate viscosity. The present invention aims to provide a spring clutch/brake lubricating device with a simple structure.

Hereinafter, the present invention will be explained in Figs. 3a, b and 4a,
An explanation will be given based on one embodiment shown in b and c. In the figure, reference numeral 11 denotes a shaft having an oil sump 12 therein, and a first sleeve 13 that constantly rotates is fitted around the shaft 11. Reference numeral 14 designates a cylindrical spring case into which a spring 15 is inserted, and which has a stopper 14a and an oil escape hole 14b protruding from the outer circumferential surface. It's summery. Further, reference numeral 16 denotes a second sleeve having an oil groove 16a, into which the spring 15 is inserted in close contact with the shaft 11, and is integrally constructed. That is, when the stopper 14a protruding from the outer peripheral surface of the spring case 14 loses its function as a stopper due to an electromagnetic solenoid (not shown), the rotational force of the first sleeve 13 causes the spring case 14 to displace in the circumferential direction, causing the spring 15 to displace. Since it is wound around the first sleeve 13, it is transmitted to the shaft 11 via the second sleeve 16 and rotated.

Therefore, a method for injecting oil into the oil sump 12 in the shaft 11 is to press the oil into the oil sump from an opening (not shown) at one end of the shaft 11 using, for example, a grease gun. 12, flows out from a hole 11a formed in the outer circumferential wall of the shaft 11 to an oil groove 16a of the second sleeve 16, and is guided to an oil escape hole 14b of the spring case 14. Therefore, when the shaft 11 rotates, oil is sent to the oil escape hole 14b due to the centrifugal force and the change in the diameter of the spring 15.
2, oil flows out little by little, allowing for appropriate lubrication.

The above description has been made regarding its function as a clutch, but by fixing the first sleeve 13, it can also be used as a brake, and the flow of oil at that time is the same as when it is used as a clutch. .

In one embodiment of the present invention, the oil sump is provided inside the shaft, but as shown in FIG. 5, the oil sump 22 may be provided inside the second sleeve 21.
In this case, centrifugal force can make it easier for oil to flow out of the oil sump 22. However, the present invention is not limited to the above embodiment, and may include a hole 11'a bored in the shaft 11' or a through hole (not shown) in the second sleeve 21 formed integrally with the shaft. There is no problem even if the oil is supplied from a source or the like and the oil is stored in an oil sump 22 provided inside the oil tank.

As explained above, according to the present invention, it is easy to lubricate the spring clutch/brake, the structure is simplified, and the life of the spring clutch can be extended.Moreover, fresh oil is always injected into the spring, and old oil is discarded. Since it is released to the outside, it has excellent effects such as further extending the life of the spring clutch.

[Brief explanation of the drawing]

Figures 1a and 1b show the main parts of a conventional spring clutch/brake. Figure 1a is a half-sectional view showing the state in which the rotational force of the first sleeve is not transmitted to the shaft, and Figure 1b is a half-sectional view showing the rotation of the first sleeve. Half-sectional view showing the state in which force is transmitted to the shaft, Figures 2 a to d
is a perspective view of the second sleeve, spring, spring case, and first sleeve showing the main parts of FIG. 1;
Figures 3a and 3b show an embodiment of the present invention.
A is a half-sectional view showing a state in which the rotational force of the first sleeve is not transmitted to the shaft in the spring clutch/brake lubrication device, and b is a half-sectional view showing a state in which the rotational force of the first sleeve is transmitted to the shaft. 4a to 4c are perspective views of the second sleeve and spring case showing the main parts of FIG. 3;
and a vertical sectional view of the shaft, and FIG. 5 shows another embodiment of the present invention, and is a half sectional view showing a state in which the rotational force of the first sleeve is not transmitted to the shaft in a spring clutch/brake lubricating device. It is a diagram. 12... Oil sump, 11a... Hole, 11... Shaft, 13... First sleeve, 16a... Oil groove,
16...Second sleeve, 15...Spring, 1
4...Spring case, 14b...Oil escape hole (oil escape part).

Claims (1)

[Claims for Utility Model Registration] (1) A rotating shaft, a first sleeve that freely rotates around the shaft, and a second sleeve that is fitted onto the shaft and rotates together with the shaft.
a sleeve; a coil spring having one end wrapped around the first sleeve and the other end wrapped around the second sleeve to transmit rotation between the first sleeve and the second sleeve; and an outer periphery of the coil spring. an oil sump provided in the shaft or second sleeve for storing oil, and a space in the spring case that communicates with the oil sump to store oil in the oil sump. for a spring clutch/brake, characterized in that the spring clutch/brake is provided with a hole for supplying oil into the spring case, and an oil escape part provided in the spring case to discharge excess oil from the spring stored in the spring case to the outside. Lubricating device. (2) The oil sump is provided in the shaft, and the hole is provided so that the oil sump and the outer circumferential wall of the rotating shaft communicate with each other. A spring clutch/brake lubrication device as described in scope 1. (3) The spring clutch/brake lubrication device according to claim 2, wherein the second sleeve is provided with an oil groove at a position communicating with the hole.