JPH0121219Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial application field This invention is designed to
This invention relates to a torque limiter that prevents this overload from being transmitted to the input shaft.

BACKGROUND TECHNOLOGY A conventional torque limiter is one in which the input-side rotating body and the output-side rotating body are connected by a power transmission ball, thereby reducing the shock during engagement and disengagement and simplifying the structure. A hole penetrating the input side rotary body and the output side rotary body near the outer periphery of the flanges, or a hole at one end and a groove with the other end opened outward, into which a shear pin is fitted, or a shear pin fitted between the input side rotary body and the output side rotary body. Attachments are bolted to support surfaces provided on the outer periphery of the side rotary body, and shear pins connecting both attachments are fitted into pin holes provided in both attachments.

Problems that the invention aims to solve In the case of the conventional torque limiter as mentioned above,
Since the planar support surfaces of the input and output rotating bodies and the attachments fixed to these support surfaces are connected only by bolts, there is a risk that the attachments will slip if a large torque is to be transmitted. Therefore, since the attachment and the bolts for fixing it to the support surface must be made larger, the torque limiter becomes larger, more complex, and less reliable.

Means for Solving the Problems This invention was devised to solve the above problems, and consists of bottoms provided on the outer peripheries of the input-side rotating body and the output-side rotating body, which are arranged concentrically. A shear pin of the same shape as the above-mentioned engagement groove was engaged with the narrow inverted trapezoid engagement groove, and a tightening bolt inserted into the insertion hole provided at both ends of the shear pin was provided at the bottom of each engagement groove. A shear pin is directly tightened by screwing into a screw hole.

Function Since the torque limiter of this invention has the above-described structure, the shear pin is engaged with and tightened in both the groove of the input-side rotary body and the groove of the output-side rotary body, and is joined to the side surface of the groove. Therefore, since the input and output rotating bodies and shear pins are connected not only by bolts but also by shear pins, even when used for heavy loads, all the torque applied to the input side rotating bodies is transmitted to the shear pins, and the set torque is When it reaches this point, the shear pin breaks and prevents the transmission of rotational force to the output rotating body.

Embodiment In the first embodiment shown in FIGS. 1 and 2, 1 is an input rotating body, and 2 is an output rotating body. An input shaft 3 is fixed to the input rotary body 1, and a cylindrical portion 5 integral with the output rotary body 2 is rotatably fitted outside the cylindrical portion 4 integral with the rotary body 1. A ring 6 fixed to the end of the cylindrical part 4 prevents it from coming off, and a transmission member 7 such as a gear is fixed to the outer end of the cylindrical part 5.

Each of the rotating bodies 1 and 2 has a disk shape, and inverted trapezoidal grooves 8 and 9 are formed in a part thereof, respectively.
In addition, screw holes 10 are provided at the bottoms of the grooves 8 and 9, respectively.
11 is formed.

Reference numeral 12 denotes a shear pin, which has a circumferential cutting groove 13 in the center as shown in FIG. Insertion holes 16 and 17 are formed in each of the engaging portions 14 and 15, respectively.

As shown in FIGS. 1 and 2, the engaging portions 14 and 15 of the shear pin 12 were engaged with the grooves 8 and 9 of the input and output rotating bodies 1 and 2, and inserted into the insertion holes 16 and 17, respectively. Screw the bolts 18, 19 into the respective screw holes 10, 11, screw the nuts 20, 21 into each bolt, tighten the respective engaging parts 14, 15 into the grooves 8, 9, and turn the input shaft 3 with appropriate power. If an excessive load is applied to the transmission member 7 while it is being driven,
The shear pin 12 is cut at the circumferential groove 13 to prevent excessive load from being transmitted to the input shaft 3 side.

In addition, in the embodiment, bolts 18, 19 and nut 2
Although the shear pin 12 is fixed to the rotating body using bolts 0 and 21, the nut can be omitted if a head bolt is used. Furthermore, although the figure shows only one shear pin 12, if the transmitted torque becomes large, the grooves 8 and 9 may be provided in a plurality of places, and the shear pin 12 may be attached to each of these grooves.

Effects This invention connects both rotating bodies with the shear pin by engaging both ends of the shear pin with each groove of the input/output rotating body as described above, and directly connects the shear pin to both rotating bodies with a bolt. This strengthens the connection between the shear pin and the rotating body, so even if the bolts that fix the shear pin to the rotating body are made thinner, there is no fear that the shear pin will shift relative to the rotating body.

Therefore, even if the transmitted torque is increased, the bolts for fixing the shear pin to each rotating body can be made thinner, so there is an effect that the product can be manufactured more compactly than conventional products.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of this invention, FIG. 2 is a longitudinal sectional side view of the same, and FIG. 3 is a perspective view showing an example of the shear pin. 1... Input side rotating body, 2... Output side rotating body,
8, 9... Groove, 13... Circumferential groove, 12... Shear pin, 16, 17... Insertion hole, 18, 19... Bolt.

Claims (1)

[Scope of utility model registration request] A shear pin formed in the same shape as the engagement groove is engaged with a communicating engagement groove of an inverted trapezoid with a narrow bottom provided on the outer periphery of the input-side rotation body and the output-side rotation body, which are arranged concentrically. A torque limiter characterized in that a shear pin is directly tightened by screwing a tightening bolt inserted into an insertion hole provided at both ends into a screw hole provided at the bottom of each engagement groove.