JPS592334Y2 - power transmission device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a power transmission device used in a clutch device or the like.

Figure 1 shows a conventional example of a clutch mode that drives a load such as a sewing machine by engaging and disengaging the clutch.
In the figure, 1 is the rotating shaft of the motor, 2 is the rotor center, and 3
is a stator core, 4 is a stator coil, 5 is a frame, 6 is an intermediate racket, 7 is a ball bearing, 8 is a flywheel supported on the rotating shaft 1, 9 is a mounting foot, 10 is a clutch lining that contacts the flywheel 8 , 11 is clutch lining 10
The clutch wheel 13 is the clutch wheel 11 glued to the boss 1.
2 is a clutch shaft supported via 2, 14 is a clutch shaft 13
15 is a tightening bolt for fixing the boss 12 to the clutch shaft 13; 16 is a movable bearing supported on the clutch shaft 13 via the ball bearing 14;
7 is a bracket that supports the movable bearing 16 so as to be slidable in the axial direction and is fixed to the end of the frame 5; 18 is the end 18;
A lever 1 that drives the clutch shaft 13 toward the flywheel B side via the movable bearing 16 by pulling down the lever a.
Reference numeral 9 indicates a fulcrum pin that is implanted in a protrusion of the bracket 17 and rotatably supports the lever 18; 20 indicates a brake spring biased to drive the clutch wheel 11 to the side opposite to the flywheel 8, that is, to the load side; and 21, a brake spring; As the clutch shaft 13 moves toward the load side, it comes into contact with the clutch wheel 11, and the clutch shaft 13
A brake lining that brakes the rotation of a load connected to the brake lining, 22 a brake shoe to which the brake lining is glued, and 23 a clutch gap adjustment screw that is screwed into a tapped hole passing through the bracket 17 and supports the brake shoe 22 at the end. Bolt, 24 (nut for rotation prevention).

With the above configuration, the electric motor continues to rotate at all times, and rotational energy is stored in the flywheel 8.

When driving a load, such as a sewing machine, by stepping on a footplate (not shown) and lowering the lever 18, the flywheel 8 and clutch wheel 11 are connected, and the load is rotated.

Furthermore, by releasing the force applied to the footboard, the clutch wheel 11 moves to the load side due to the spring pressure of the brake spring 20, presses the brake roughening 21, and causes friction between the clutch wheel 11 and the brake lining 21. By force,
Stop the load.

and 5. In this type of clutch mode, lever 1 is used because the load is repeatedly started and stopped.
Since the movable bearing 16 is frequently driven toward the load side and the anti-load side, the ball bearing 14 is repeatedly subjected to thrust loads, and the ball bearing 7 of the electric motor continues to rotate at all times. It wears out earlier than the previous model.

Therefore, if abnormal noise is generated during operation of the ball bearing 14, it is necessary to disassemble it and inspect it twice.In the conventional ball bearing shown in FIG. Since the structure is such that movement of the ball bearing 14 to the load side is prevented by a, it is necessary to move the movable bearing 16 to the opposite load side after removing the clutch wheel 11.
This had the disadvantage that disassembly and inspection required a lot of time.

The purpose of this invention is to improve the above-mentioned drawbacks. A cylindrical body is provided to cover one end of the power transmission shaft, and the movement of the cylindrical body is controlled by a key fitted to the end of the power transmission shaft. The present invention provides a power transmission device designed to prevent the above.

An embodiment of this invention will be described below with reference to FIGS. 2 to 6.

In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts, and 25 denotes a clutch shaft (power transmission shaft) 26 provided with a stepped portion 25a on the load side that prevents the ball bearing 14 from moving toward the opposite load side. 27 is a sleeve for maintaining a predetermined spacing between the ball bearings 14, and 28 is a key groove 25 formed in the shaft end 25b. 29 is a cylindrical body that is in contact with the side of the ball bearing 14 on the load side and covers the shaft end 25 b on the side where the key groove 25 C is provided; 29 a is the key fitted to the key 28;
The through groove 30 through which the key 28 passes is a retaining ring that prevents the cylindrical body 29 from coming off from the shaft end 251 when the key 28 is not present.

With the structure described above, the operation of connecting the clutch wheel 11 to the flywheel 8 is the same as that of the conventional one, but the operation of releasing the clutch wheel 11 from the flywheel 8 is performed by a movable bearing using the spring pressure of the brake spring 20. 16 to the load side, the cylindrical body 29 is moved to the load side, and the cylindrical body 2
Step 9 is performed by moving the clutch shaft 25 to the load side via the key 2B.

In the embodiment L, the boss 26 of the clutch wheel 11 is fixed to the end of the clutch shaft (power transmission shaft) 25 by welding. There is no problem even if it is attached to 11.

In the above configuration, in order to take out the movable bearing 16, the key 28 is taken out and the cylindrical body 29 is attached to the shaft end 2 of the clutch shaft 25.
5b, the movable bearing 16 and ball bearing 14 can be taken out toward the load side.

As described above, with this invention, the movable bearing can be taken out to the load side along with the ball bearing simply by removing the key from the power transmission shaft and removing the cylindrical body covering the shaft end of the clutch shaft (power transmission shaft). Therefore, there is no need to remove the clutch wheel, and the workability of inspecting and replacing bearings is improved.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the configuration of a conventional example, Figs. 2 to 6 show an embodiment of this invention, Fig. 2 is a sectional view showing the configuration of the main part, and Fig. 3 is a shaft end. Fig. 4 is a plan view of the cylindrical body, Fig. 5 is a sectional view taken along the line V-■ in Fig.
It is a Vi-VI sectional view of the figure. In the figures, the same reference numerals indicate the same or corresponding parts7.
14. 14 is a bearing, 25 is a clutch shaft (power transmission shaft),
25 a is a step, 25 b is a shaft end, 25 C is a keyway,
28 is a key, and 29 is a cylindrical body.

Claims (1)

[Scope of utility model registration request] A power transmission shaft with a keyway provided at one end and a stepped portion at the other end, and two bearing devices provided correspondingly between the keyway and the stepped portion to rotatably support the power transmission shaft. and a cylindrical body located at one end of the power transmission shaft and fitted to cover the keyway portion,
Holding one side of the bearing device at the stepped portion of the power transmission shaft,
The cylindrical body is held on the power transmission shaft in a state where it cannot be removed by a key that penetrates the cylindrical body and is fitted into the key groove, and the other side of the bearing device is held through the cylindrical body. Power transmission device.