JPS6142981Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a torque limiter.

FIG. 1 shows a longitudinal section of a conventional torque limiter. A hub 2 fixed to a rotating shaft 1 has a flange 3 at one end and a threaded portion 4 at the other end. A transmission wheel 5 (for example, a sprocket wheel) in a transmission relationship with the rotating shaft 1 is fitted into the hub 2 via a bush 6, and a disk 7 fitted into the hub 2 is stopped from rotating.
and the flange 3 with friction plates 8, 8 interposed therebetween. Place the disc spring 10 held by the spring bearing ring 9 fitted on the hub 2 against the back of the disk 7, and screw in three adjustment bolts 12 at equal intervals on the circumference into the adjustment nuts 11 screwed into the threaded part 4. By tightening the nut 11 and bolt 12, the disk 7 is appropriately pressurized to adjust the slip torque of the transmission wheel 5.

As mentioned above, in conventional torque limiters, the overall length of the hub is long due to the threaded portion 4, and the rotating shaft 1 often does not reach the outer end of the hub 2 as shown in the figure, making it difficult to prevent the key from falling out. In addition, in addition to requiring man-hours such as processing to stop the rotation of the disk 7 and processing the threaded portion 4, it is also necessary to tighten both the nut 11 and the bolt 12 to adjust the torque, and this tightening is performed in the axial direction. Since it can only be done from one side, it has drawbacks such as being extremely difficult to tighten depending on the arrangement of the equipment. Furthermore, since the bushing 6 is a sliding bearing that is short in length relative to its outer diameter, it has the disadvantage that it is susceptible to galling, seizure, etc. when the transmission wheel 5 slips.

The purpose of this invention is to propose a torque limiter that eliminates the above-mentioned drawbacks of the conventional torque limiter.Instead of the adjustment nut and adjustment bolt of the above-mentioned conventional torque limiter, the flange 3 and the spring bearing ring 9 are directly tightened with bolts, Moreover, it is characterized in that it can be tightened from either side in the axial direction, and that a ring-shaped bush through which the bolt passes is interposed between the transmission wheel center hole and the hub, thereby improving the bearing function for the transmission wheel.

The embodiment shown in FIG. 2 will be described below. In this case, the flange 13 is similar to the above conventional example.
A disk 15 and a spring bearing ring 16 are fitted into a hub 14 having a diameter, and no rotation preventing means is provided between the disk 15 and the hub 14. Friction plates 17, 1 are provided between the flange 13 and the disk 15 as in the conventional case.
The transmission wheel 18 is held between the friction plates 17 and 7.
The transmission wheels 18 are each provided with center holes 19 and 20 larger than the outer diameter of the hub, and the pilot plate 16 is tightened against the flange 13 by bolts 21 passing through the center holes 19 and 20 and the disc 15, thereby tightening the plate. Transmission wheel 18 via spring 22
and adjust its slip torque.

Three bolts 21 are arranged at equal intervals on the circumference, and the flange 13 and the spring bearing ring 16 are provided with bolt holes 23 and screw holes 2 into which the bolt heads are sunk, as shown in FIG.
4 and 3 are provided alternately and equally spaced on the circumference, as shown in the upper half and lower half of Figure 2.
A bolt 21 is inserted from either the flange 13 side or the spring bearing ring 16 side, whichever is easier to tighten, and the two are fastened together.

In the center hole 20, three ring-shaped bushes 25, each rotatably supported by a bolt 21, are provided in contact with the inner surface of the center hole 20 and not in contact with the hub 14.

As a result, when the transmission wheel 18 slips with respect to the hub 14, the annular bushing 25 rotates to follow the transmission wheel 18 around the bolt 20, and the bushing 25
Since the ratio of the rotation radius to the axial length is much smaller than that of the conventional bushing 6, the rotation is smooth and there is no risk of galling or seizure as in the conventional bushing. A miniature ball bearing can also be used instead of the bush 25.

The present invention has the above-mentioned structure, and since the conventional adjusting nut and adjusting bolt are omitted, the shaft length of the hub can be shortened, the shaft can be easily attached to the hub, and the slip torque can be adjusted by either of the bushings. It is convenient to attach since it can be installed from the side, and it has the effect of significantly reducing costs and allowing smooth slip rotation of the transmission wheel 18.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional example, FIG. 2 is a vertical cross-sectional view of an embodiment of the present invention, and FIG. 3 is a layout diagram of bolt holes in a flange and a spring bearing ring. 1... Rotating shaft, 3... Flange, 14... Hub, 15... Disc, 16... Spring bearing ring,
17...Friction plate, 18...Transmission wheel, 19,20...
...center hole, 21...bolt, 22...disc spring, 2
2...insertion hole, 24...screw hole, 25...ring-shaped bush.

Claims (1)

[Scope of utility model registration request] The transmission wheel is supported so as to be able to slip and rotate through a friction plate between the flange of the hub that connects to the rotating shaft and the disk that fits on the hub, and is connected to the disk via a disc spring by a spring bearing ring that fits on the hub. In the torque limiter that applies the adjustment pressure that causes slip, the spring bearing ring is arranged at equal intervals on the circumference of the hub flange, and the annular bush whose outer circumferential surface contacts only the inner surface of the center hole of the transmission wheel is rotatably supported. A torque limiter is tightened by three or more bolts, and is characterized in that the flange of the hub and the spring bearing ring are each provided with bolt insertion holes and threaded holes equal to the number of bolts to be used at equal intervals on the circumference and alternately. .