JPH062035Y2 - Torque limiter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a torque limiter for various drive force transmission devices.

[Prior art]

The structure disclosed in Japanese Utility Model Publication No. Sho 53-6766 has been proposed as a torque limiter. The proposed torque limiter has a brake lining fitted on the outer periphery of a boss, a slit is formed along the axial direction on the body fitted around the boss, and a pair of sliding members and a pair of bands are formed on the outer periphery of the body. Stack the metal fittings in sequence,
Since both ends of a pair of overlapping sliding members and band fittings are connected to each other by bolts and nuts via springs, the number of parts is large and the gear part is integrally formed on one side of the sinus body. Since the splits are formed on the other side and the splits are deformed by tightening the pair of band metal fittings, there is surface contact, which results in an unbalanced load. Therefore, brake lining is required. In addition, there is a drawback that the assemblability is poor.

[Purpose of device]

In view of the above drawbacks, the present invention is to obtain a torque limiter which is small in size and stable in function with a small number of parts.

[Constitution of device]

The present invention has a plate member having a rotary shaft portion, a concave curved portion that abuts the rotary shaft portion at two places in the middle, a screw hole at one end side and a hole thicker than the screw hole at the other end side, and the screw. Two plate members, each of which is composed of an adjusting screw that is screwed into the hole and an expanding spring that is fitted between the plate member and the adjusting screw, are made to face each other with the rotary shaft part sandwiched between the concave curved parts. , A mechanism portion formed by screwing the adjustment screw into the screw hole from a side of the thick hole through an expansion spring, a space portion, and an adjustment opening portion of the adjustment screw, and is loosely fitted to the plate body. It is composed of a matching rotating body, and the mechanism portion is incorporated in the space portion of the rotating body.

〔Example〕

The present invention will be described below with reference to the illustrated embodiments. 1 and 2, the torque limiter is configured such that the mechanism B of the torque limiter is dropped into the space A of the rotating body 1 having teeth and the lid 2 is fixed by the connecting screw 3. .

As shown in FIGS. 1 to 3, the torque limiter mechanism portion B has two plate bodies 5 and 5 placed on the upper and lower sides of the outer periphery of the metal ring 4 of the rotary shaft portion C, and the two plate bodies 5 and 5 are attached. Is fixed at both ends by adjusting screws 7, 7 which sandwich the expansion springs 6, 6.

As shown in FIGS. 2 and 4, the rotary body 1 is made of a synthetic resin material and has an outer shape formed by a boss portion 1a and a tooth portion 1b, and the space portion A is formed in the boss portion 1a. At the center of the boss portion 1a, a two-stage large-diameter hole 1c and a smaller-diameter hole 1d are formed. Boss
A step portion 1e into which the lid 2 is fitted and a recessed portion 1f are formed on the edge of 1a opposite to the tooth portion 1b. A screw hole 1g into which the coupling screw 3 is screwed is formed at the center of the recess 1f. Openings 1h and 1h are formed in the boss portion 1a at the head position of the adjusting screws 7 and 7, respectively. Further, recesses 1i, 1i are formed inside the edge of the boss portion 1a on the side opposite to the tooth portion 1b.
a and 5a are loosely fitted respectively.

As shown in FIGS. 5 and 6, the lid 2 is provided with a convex portion 2a and an edge portion 2b, which are fitted in the concave portion 1f, inside the disc made of synthetic resin material.
A through hole 2c through which the coupling screw 3 penetrates is formed at the center of the. A large diameter through hole 2d into which the bush 8 is fitted and a screw lock injection hole 2e are formed in the center of the disk.

The rotating shaft portion C is composed of a rotating shaft 9, a bush 8 and a metal ring 4 as shown in FIG. Bush 8 is rotating body 1
It is rotatably supported by the hole 1d and the through hole 2d of the lid 2, and the center is fitted to the rotating shaft 9 by the D hole 8a. The metal ring 4 is press-fitted onto a part of the outer circumference of the bush 8.

As shown in FIGS. 1 and 3, the two plate members 5 and 5 have concave portions 5b and 5b, which come into contact with the rotary shaft portion C and two portions of the metal ring 4, and have screw holes at one end 5a. 5c and a hole 5e thicker than the screw hole 5c are formed in the other end 5d. Adjusting screws 7, 7 in the screw hole 5c
Are screwed together. The two plate bodies 5 and 5 are assembled such that a screw hole 5c is formed on one end side 5a and a thick hole 5e is formed on the other end side 5d so as to face each other with different phases, and the recessed portion of the rotating body 1 is formed.
Since it is loosely fitted to 1i, it is automatically aligned following the metal ring 4 of the rotary shaft portion C.

When the torque limiter is assembled, grease is applied to the sliding contact surfaces of the two plate members 5 and 5 with the metal ring 4, and they are assembled so as to face each other, and loosened by the adjusting screw 7 in which the expansion spring 6 is fitted. The torque limiter mechanism unit B is assembled by being coupled.

After the torque limiter mechanism B is installed in the space A of the rotating body 1 as shown in FIG. 1, the driver is inserted through the openings 1h and 1h and the adjusting screw 7 is turned to adjust the limit torque. . After the torque is set, the screw lock material is injected from the screw lock injection hole 2e of the lid 2 into the screwing portion of the adjusting screw 7 and the plates 5 and 5.

In the operation of the torque limiter, when a driving force is applied to the rotating body 1 or the rotating shaft 9, the other side is driven to rotate. When the load becomes larger than the pressure contact force of the expansion spring 6, both of them slip and serve as a torque limiter.

When the torque limiter is configured as described above, the pair of two plate bodies 5 are automatically aligned along the outer circumference of the metal ring 4 so that an unbalanced load does not occur, and fine adjustment is possible with the adjustment screw 7. Since the number of parts is small, the assemblability is good and the cost can be reduced. Further, since the sliding contact surface between the plate body and the metal ring is open and the adjustment opening 1h of the adjustment screw 7 is provided, cooling can be performed when heat is generated due to slip. Further, even if the bush 8 is formed of a synthetic resin material, the metal ring 4 and the metal plate body 5 are in contact with each other to prevent wear, and the metal materials are in contact with each other and grease is applied, so that durability is improved. .

FIG. 7 shows a modified example in which a peripheral groove 4a for oil storage is formed on the outer periphery of the metal ring 4. Since slippage occurs between the metal ring 4 and the plate 5 when the torque is applied with a torque larger than a predetermined value, it is desirable that grease be accumulated in the circumferential groove 4a.

FIG. 8 shows a modification in which a spiral groove 4b for oil storage is formed on the outer circumference of the metal ring 4.

FIG. 9 shows a modification in which a plate body 5 is provided with a recess or hole 5f for storing oil. Forming a recess or hole 5f for storing oil in the plate body 5 facilitates processing.

In the above embodiment, the plate body 5, the expansion spring 6, the adjusting screw 7 are used.
Although one pair was used, this connection configuration, that is, one plate 5
Has a thick hole 5e, and the other plate 5 is provided with a screw hole 5c so as to face each other, and an adjusting screw 7 is screwed into the plate 5 through the expansion spring 6, and the plate 5 on the opposite side with the rotary shaft portion C interposed therebetween. Even if the opposing portions of No. 5 are joined by an appropriate joining means, the effects such as self-alignment and a small number of parts can be obtained.

[Effect of device]

Since the present invention is configured as described above, the two plates are automatically centered along the outer circumference of the rotary shaft, no eccentric load is generated, and fine adjustment is possible with the adjusting screw. Since the number is small, the assemblability is good and the cost can be reduced. Further, since the sliding contact surface between the plate body and the rotating shaft portion is open and the adjusting screw has the adjusting opening portion, cooling can be performed when heat is generated due to slip. Further, the sliding contact surface is contacted by the metal materials, and it is possible to provide a torque limiter which has excellent practical effects such as abrasion resistance and improved durability.

[Brief description of drawings]

An embodiment of the present invention is shown in the drawings, FIG. 1 is a sectional front view of a main portion of a torque limiter with a lid removed, FIG. 2 is a sectional side view of a torque limiter, and FIG. 3 is a sectional front view of a torque limiter mechanism portion. FIG. 4 is a perspective view of a rotating body having teeth,
5 is a sectional side view of the lid, FIG. 6 is a front view of the lid, FIG. 7 is a perspective view of a modified example in which a peripheral groove for oil sump is formed on the outer circumference of the metal ring of the rotating shaft portion, and FIG. A perspective view of a modified example in which a spiral groove for oil storage is formed on the outer circumference of the metal ring of the rotating shaft part,
The drawing is a perspective view of a modified example in which a plate body is provided with a recess or hole for storing oil. C ... Rotating shaft portion, 1 ... Rotating body having tooth portions, 5 ... Plate body, 5a
… One end side, 5b… Concave curved part, 5c… Screw hole, 5d… Other end side, 5e…
Thick hole, 6 ... Expansion spring, 7 ... Adjustment screw.

Claims (1)

[Scope of utility model registration request] 1. A plate body having a rotary shaft portion, a concave curved portion that abuts the rotary shaft portion at two places in the middle, and a screw hole at one end side and a hole thicker than the screw hole at the other end side, Two plate members, each of which is composed of an adjusting screw to be screwed into the screw hole and an expanding spring fitted between the plate member and the adjusting screw, are opposed to each other with a concave curved portion sandwiching the rotary shaft portion. And has a mechanism portion formed by screwing the adjusting screw into the screw hole from the thick hole side through an expansion spring, a space portion and an adjusting screw adjusting opening portion, and is loose from the plate body. A torque limiter comprising a rotating body to be fitted, and the mechanism portion being incorporated in a space portion of the rotating body.