JPH054574Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a power transmission device that can be slippered and adjusted according to load conditions, and is used in one-way clutches, transmission torque limiting devices, etc. It is.

(Prior Art and Its Problems) Conventionally, the above-mentioned power transmission device requires a snap spring, malleable screw, etc. on the shaft, and the mechanism for adjusting the slip is complicated, so it has been difficult to downsize the device. For this reason, it has the disadvantage that it is difficult to use it in equipment that needs to be small and lightweight, such as a pencil lead device for an automatic drafting machine.

(Means for Solving the Problems) An object of the present invention is to solve the above-mentioned problems and provide a power transmission device that is small and easy to adjust the slip.

That is, the shaft has a groove provided on its outer periphery along a plane perpendicular to the shaft, a through hole opening at both ends in the groove and crossing the shaft, and a screw hole reaching the through hole from the outside of the shaft. and the rotational force transmission wheel is provided with a groove corresponding to the groove of the shaft on the inner periphery of the shaft hole thereof, and an annular space formed by the groove of the shaft and the corresponding groove of the rotational force transmission wheel. A split ring inserted into the shaft, a rubber material inserted into the through hole of the shaft, and a push screw screwed into the threaded hole of the shaft are provided, and the rubber material is pressed by adjusting the push screw. This makes it possible to adjust the friction between the shaft and the rotational force transmission wheel.

(Function) As mentioned above, not only is the slip adjustment extremely easy, but since nothing is protruding from the outside of the shaft and rotational force transmission wheel, it is extremely small and lightweight.

(Example) Fig. 1 shows the first embodiment of the present invention, in which A is a front view (partially sectional), B is a side view (partially sectional), and C is a sectional view taken along A-A in B. . A groove 2 is provided along the circumference of the shaft 1, and a through hole 3 whose both ends are open is provided at the position of the groove 2. A screw hole 4 is provided to penetrate between the through hole 3 and the end of the shaft 1.

A groove 6 is provided along the inner surface of the shaft hole of the rotational force transmission wheel (gear) 5, corresponding to the groove 2 of the shaft 1. A split ring 7 is inserted into the annular space formed by the grooves 2 and 6. This split ring 7 has an inner diameter equal to the inner diameter of the groove 2 of the shaft 1, an outer diameter equal to the outer diameter of the shaft 1, and a thickness such that the ring has a width that can be loosely fitted into the groove 2, and is divided into two parts.

A rubber material 9 is inserted into the through hole 3, and a set screw 8 is screwed into the screw hole 4.

When assembling these, the split ring 7 is completely inserted into the groove 2 of the shaft 1, the gear 5 is inserted into the shaft 1, and the set screw 8 is screwed in at the position where the grooves 2 and 6 coincide. is deformed by being pushed by the set screw 8, pushes out the split ring 7 outward while protruding from both ends of the through hole 3, and presses it against the bottom of the groove 6 of the gear 5. As a result, the split ring 7 is inserted so as to straddle both the grooves 2 and 6, thereby positioning the gear 5 and transmitting rotational force through friction.

In this case, the frictional force can be adjusted by tightening the set screw 8.

FIG. 2 is a side view (partially in section) showing a second embodiment, in which a screw hole 8' is diagonally provided between the through hole 3 and the side surface of the shaft 1. All other details are the same as in FIG.

(Effects of the invention) As described above, the positioning of the gear 5 and the frictional force are performed by a set of split rings 7, and the frictional force is adjusted inside the shaft 1, so the overall size can be reduced. .

[Brief explanation of drawings]

FIG. 1 shows a first embodiment of the present invention, in which A is a front view (partially sectional), B is a side view (partially sectional),
FIG. 2 is a side view (partial cross section) of the second embodiment. 1... shaft, 2... groove, 3... through hole, 4... screw hole, 5... gear, 6... groove, 7... split ring,
8...Press screw, 9...Rubber-like material.

Claims (1)

[Scope of utility model registration request] In a power transmission device that allows slip adjustment by adjusting frictional force, the shaft has a groove provided on its outer periphery along a plane perpendicular to the shaft, and a through hole that is open at both ends in the groove and passes through the shaft. , a screw hole reaching the through hole from the outside of the shaft is provided, a groove corresponding to the groove of the shaft is provided on the inner periphery of the shaft hole of the rotational force transmission wheel, and a groove of the shaft corresponding to the groove of the shaft is provided. A split ring inserted into an annular space formed by a groove of a rotational force transmission wheel, a rubber-like material inserted into a through hole of the shaft, and a push screw screwed into a screw hole of the shaft, A power transmission device characterized in that the friction between the shaft and the rotational force transmission wheel can be adjusted by pressing the rubber material by adjusting the push screw.