JPH0723626Y2 - Torque limiter - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] This invention is intended to transmit rotational torque,
The present invention relates to a torque limiter that cuts off.

[0002]

2. Description of the Related Art The rotation of a shaft is transmitted to a rotating body such as a roller,
A torque limiter is used when transmitting and blocking the rotational torque to and from the rotating body according to the magnitude of the load acting on the rotating body.

By the way, since the conventionally known torque limiter transmits and cuts off the rotational torque only in one direction of rotation, the rotational torque is transmitted to the rotating body in both forward and reverse directions. When transmitting and shutting off, it is necessary to provide two types of torque limiters, one for forward rotation and the other for reverse rotation, which not only causes a cost increase but also has a problem in that the installation is limited.

In order to solve such a problem, a torque limiter built-in type in which a torque limiter capable of transmitting and blocking rotational torques having different magnitudes in both forward and reverse directions is incorporated inside a rotating body. Has already proposed (Japanese Patent Application No. 3-247323).

FIG. 3 and FIG. 4 show a torque limiter built-in type rotating body which the applicant of the present invention has already proposed, in which a rotating body 1 molded of synthetic resin is formed with a fitting recess 2 which is open at one side. A torque limiter 10 that transmits the rotation of the shaft 3 to the rotating body 1 is incorporated inside the fitting recess 2, and a holding lid 4 is attached to the opening of the fitting recess 2 to prevent the torque limiter 10 from coming off.

The torque limiter 10 is composed of an outer ring 11, an inner ring 12, a roller clutch mechanism 20 and a coil spring 13 provided between the both wheels 11, 12, and the outer ring 1
1 is fixed to the rotating body 1. Roller clutch mechanism 2
0 indicates an inclined surface 21 inclined in the circumferential direction on the inner diameter surface of the outer ring 11.
The cages 22 are provided at equal intervals in the circumferential direction, and the cage 22 incorporated between the outer ring 11 and the inner ring 12 faces the inclined surfaces 21 and faces the pockets 2.
3, the roller 24 assembled in each pocket 23 is pressed in the circumferential direction by the torque setting spring 25,
Is pressed against the cylindrical outer surface of the inner ring 12 and the inclined surface 21.

The coil spring 13 is incorporated between the inner ring 12 and the shaft 3, and a bending piece 14 provided at one end is engaged with an axial engaging groove 15 formed on the inner surface of the inner ring 12.

In the rotating body with the built-in torque limiter having the above structure, when the shaft 3 rotates in the direction of the arrow in FIG. 4, the coil spring 13 contracts in diameter and the shaft 3 rotates through the coil spring 13. Is transmitted to the inner ring 12, and the roller 2
4 is transmitted to the outer ring 11. When the load acting on the outer ring 11 increases, the roller 24 moves toward the wide portion of the space formed by the cylindrical outer surface of the inner ring 12 and the inclined surface 21 by contact with the inner ring 12, and the inner ring 12 and the roller 24
A slip occurs between the outer ring 11 and the outer ring 11, and the torque transmission from the outer ring 11 to the rotating body 1 is blocked.

When the shaft 1 rotates in the direction opposite to the direction of the arrow in FIG. 4, the coil spring 13 is rewound and the coil spring 1
The binding force by which the shaft 3 tightens the shaft 3 decreases, slippage occurs when the binding force and the frictional force of the part balance, and the shaft 3 idles.

As described above, the previously proposed rotary body with built-in torque limiter generates the on / off torque by the spring force of the torque setting spring 25 when the shaft 1 rotates in the direction of the arrow, and the coil spring 13 when rotating in the opposite direction. Generates the on / off torque by the binding force that tightens the shaft 3, so that by making the spring force of the torque setting spring 25 and the binding force of the coil spring 13 different, it becomes different in both the forward and reverse directions. It has a characteristic that a large amount of torque can be transmitted to the rotating body 1.

[0011]

In the rotating body having the built-in torque limiter, since the inner diameter of the coil spring 13 in the natural state is smaller than the outer diameter of the shaft 3, when the shaft 3 is assembled, the shaft 3 is mounted. The shaft 3 is inserted inside the inner ring 12 while rotating the coil spring 13 in the direction in which the coil spring 13 is expanded. Therefore, when the shaft 3 is assembled, the inner ring 12 receives a pressing force in the axial direction, and as shown in FIG. 3, when the inner diameter of the holding lid 4 is larger than the outer diameter of the inner ring 12, the inner ring 12 is shown in FIG. There is a risk of getting out.

This invention has a technical object to prevent the inner ring from coming out from the inner side of the outer ring when the shaft is assembled.

[0013]

In order to solve the above-mentioned problems, in the present invention, in the above-mentioned torque limiter, the inner diameter portion of the holding lid attached to the opening of the fitting recess is opposed to the end surface of the inner ring. The adopted structure was adopted.

Here, the torque limiter has a pair of oil-impregnated bearings for preventing axial movement of the coil springs fixed to both ends of the inner ring of the inner ring, and the oil-impregnated bearings rotatably support the shaft. Good.

In the case of such a torque limiter, the oil-impregnated bearing provided on the side of the holding lid has a length such that its end portion penetrates the holding lid and projects outward, and the end surface of the oil-impregnated bearing is attached to the shaft. It is preferable to bring the stop ring for positioning into contact with the stop shaft and the holding lid in a non-contact state to reduce the rotational resistance applied to the rotating body.

[0016]

As described above, according to this invention, since the inner diameter portion of the pressing lid faces the end surface of the inner ring as described above, it is possible to prevent the inner ring from slipping out when the shaft is inserted into the inner ring. .

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a first embodiment of a torque limiter built-in type rotating body according to the present invention. Here, since the configuration of the torque limiter 10 incorporated inside the rotating body 1 is the same as that of the torque limiter 10 of FIGS. 3 and 4 described above, the same parts are designated by the same reference numerals. And the description is omitted.

Coil spring 1 incorporated inside the inner ring 12
Reference numeral 3 denotes a pair of oil-impregnated bearings 16a, 1a provided at the axial center of the inner ring 12 and provided on both sides of the coil spring 13 thereof.
6b is fixed to the inner ring 12 by means of press fitting or adhesion, and the shaft 3 is rotatably supported by the oil-impregnated bearings 16a and 16b.

The annular pressing lid 4 provided at the opening of the fitting recess 2 has an annular projecting portion 5 on the outer circumference, and the projecting portion 5 and an annular groove 6 formed on the inner circumference of the fitting recess 2. The holding lid 4 is fixed to the rotating body 1 by the engagement of. The inner diameter of the pressing lid 4 faces the end surface of the inner ring 12, and the outer peripheral surface contacts the retaining ring 7 attached to the shaft 3 to position the rotating body 1.

As described above, the inner diameter of the pressing lid 4 is set to the inner ring 1
By facing the end surface of the inner ring 12, the inner ring 12 can be prevented from slipping out when the shaft 3 is inserted into the inner ring 12.

FIG. 2 shows a second embodiment of the rotating body according to the present invention. In this second embodiment, a pair of oil-impregnated bearings 1
Of the 6a and 16b, the end of the oil-impregnated bearing 16a provided on the presser lid 4 side is projected outward from the central hole 8 of the presser lid 4, and the outer end surface thereof is brought into contact with the retaining ring 7 to position the rotating body 1. is doing.

As described above, when the end surface of the oil-impregnated bearing 16a is brought into contact with the retaining ring 7, the retaining lid 4 and the retaining ring are held in non-contact with each other, so that the retaining lid 4 rotating with the rotating body 1 is retained. It is possible to prevent scratches from being brought into contact with 7, and it does not affect the transmission of torque to the rotating body 1.

In the case of the embodiment, a pair of oil-impregnated bearings 16a, 16b is fixed to the inner side of the inner ring 12 as the torque limiter. However, the torque limiter is not limited to this, and for example, a torque limiter as shown in FIG. It may be a limiter.

Oil-impregnated bearings 16a and 16b are provided inside the inner ring 12.
In the torque limiter with the fixed
Since there is no contact between the shaft 3 and the shaft 3,
It is possible to prevent the outer periphery of the shaft 3 from being scratched.

As the lubricant with which the oil-impregnated bearings 16a and 16b are impregnated, mineral oil, synthetic oil and semi-solid or solid grease can be mentioned.

[0027]

As described above, in the rotating body according to the present invention, since the inner diameter portion of the pressing lid is opposed to the end surface of the inner ring, the inner ring is pulled out to the outside when the shaft is inserted into the inner ring. Can be prevented, and the workability of assembly can be improved. Further, by fixing the pair of oil-impregnated bearings inside the inner ring to support the shaft, it is possible to prevent the shaft from being scratched when the shaft idles. further,
If the holding lid is in contact with the retaining ring for positioning the rotating body, the torque transmission is affected by the friction acting between the holding lid and the retaining ring, but the end surface of the oil-impregnated bearing is brought into contact with the retaining ring. This can prevent the torque transmission from being affected.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of a rotating body according to the present invention.

FIG. 2 is a vertical sectional front view showing a second embodiment of the same rotating body.

FIG. 3 is a longitudinal sectional front view of the already proposed rotating body.

FIG. 4 is a vertical side view of the above.

FIG. 5 is a sectional view showing an assembled state of the shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating body 2 Fitting recessed portion 3 Shaft 4 Presser lid 11 Outer ring 12 Inner ring 13 Coil springs 16a, 16b Oil impregnated bearing 20 Roller clutch mechanism

Claims (3)

[Scope of utility model registration request] 1. An outer ring, wherein a rotating member is formed with a fitting recess opening on one side, and an inner ring is rotated only in one direction between an outer ring fixed in the fitting recess and an inner ring incorporated therein. A roller clutch mechanism for transmitting to the inner ring, and one end of which is connected to the inner ring between the inner ring and a shaft inserted therein, and a coil that is wound when the shaft rotates in the disengagement direction of the roller clutch mechanism. incorporate springs, the torque limiter, characterized in that the roller clutch mechanism is retained by pressing the lid attached to the opening of the fitting recess, and are opposed to the inner diameter portion of the pressing lid on the end face of the inner ring. Te wherein at <br/> the torque limit data according to claim 1, move the coil spring is provided at the central portion in the axial direction of the inner ring inner diameter surface, the inner surface at both ends of the inner ring in the axial direction of the coil spring A torque limiter, which is equipped with a pair of oil-impregnated bearings that prevent 3. The torque limiter according to claim 2, wherein an outer end portion of the oil-impregnated bearing provided on the side of the holding lid is inserted into a center hole of the holding lid so as to face the outside of the holding lid. A torque limiter.