JPH062036Y2 - Torque limiter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a torque limiting device, and more particularly to a torque limiting device having an improved mechanism for stopping a torque adjusting nut for adjusting a pressing force of a spring.

(B) Prior art An output member that is driven by a drive shaft and has a plurality of grooves formed in its peripheral portion, a rolling member that is rotatably provided in the groove, and one of the grooves. An output member that is rotatably attached to the input member and that engages the rolling member on the side of the groove, and an output member that is axially movable relative to the input member on the other side of the groove. A thrust washer that engages with the rolling member, a torque adjusting nut screwed to the input member so as to adjust the rotational position, and a thrust washer provided between the thrust washer and the torque adjusting nut. An example of a conventional so-called torque limiting device, which includes a spring for applying a force to the rolling member and changes the position of a torque adjusting nut to transmit torque from an input member to an output member, is, for example, Japanese Patent Publication No.
55-21893 and Japanese Patent Publication No. 55-21894. In this conventional device, as a method of locking the torque adjusting nut, the ball is prevented from loosening by the ball loosening prevention screw screwed into the radially extending screw hole formed in the flange portion of the torque adjusting nut. The torque adjustment nut is locked to the input member by pressing it against the outer peripheral surface of the boss.

By the way, when the torque limiting device is incorporated in the index device, the intermittent drive mechanism is arranged adjacent to the input member, the output member is attached to a table having a relatively large diameter, and various devices are attached to the table. Therefore, there is a problem that it is difficult to approach the flange portion of the torque adjustment nut in terms of space, and it is difficult to lock the torque adjustment nut after the limit torque adjustment.

(C) Problem to be Solved by the Invention The problem to be solved by the present invention is to enable the locking operation of the torque adjusting screw from the upper surface of the torque limiting device to facilitate the adjustment.

(D) Means for Solving the Problem The present invention is directed to an input member, an output member that is relatively rotatable with respect to the input member, and a rolling member formed in a notch formed in one of the input member and the output member. A rolling member that is arranged movably and is movable relative to the other of the input member or the output member together with the one, and that is responsible for transmitting torque between the input member and the output member; A spring for elastically pressing a member to the other side of the input member or the output member, a thrust washer arranged adjacent to the rolling member for transmitting the elastic force of the spring to the rolling member, and the input member side Or a torque adjusting nut that is screwed to one side of the output member and adjusts the elastic force of the spring, and the spring is arranged so as to surround the outer circumference of one of the input member and the output member. For the input member side or output In a torque limiting device screwed to a screw formed on one outer periphery of a member, one of the input member and the output member has an axial hole extending axially from an end surface and the input member or the output from the axial hole. A radial hole extending to the outer circumference of the member is provided, a locking member that engages with the inner circumference of the torque adjusting nut is provided in the radial hole, and the locking member is radially outside in the axial hole. A pressing member that pushes out to engage with the torque adjusting nut is provided.

(E) Action In the above configuration, when the load applied to the output member is lower than the predetermined value determined by the spring, torque is transmitted from the input member to the output member via the rolling member. When the load applied to the output member exceeds a predetermined value, relative rotation occurs between the input member and the output member, and torque is not transmitted.

When changing the set value of the limit torque, the pressing member is loosened to release the pressing force of the locking member in the radial direction, and then the torque adjusting nut is rotated for adjustment. After the adjustment, the pressing member is tightened to push the locking member outward in the radial direction, and engage and lock the torque adjusting nut.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 there is shown a first embodiment of the torque limiting device according to the present invention. The torque limiting device 1 of this embodiment includes an input member 2 connected to a drive shaft (not shown) and rotated by the drive shaft, and a flange 2 of the input member 2.
The output member 3 is rotatably attached to the input member adjacent to one side (the upper side in the drawing) of the second member via bearings 31 and 32, and is formed on the outer circumference of the flange 22 so as to be circumferentially separated. A roller type rolling member 4 freely accommodated in a plurality of notches 24 and a ring-shaped member provided on the other side of the flange so as to be rotatable and axially movable relative to the input member 2. The thrust washer 5, a spring bearing 6 provided adjacent to the thrust washer 5 so as to be rotatable with respect to the thrust washer, and a boss portion 21 of the input member 2.
And a plurality of disc springs 8 provided between the spring receiver 6 and the flange 72 of the torque adjusting nut 7. ing. The spring may be a coil spring, and the rolling member may be spherical.

The diameter of the rolling member 4 is larger than the thickness of the flange 22 of the input member 2 so that it can project to either the upper side or the lower side of the flange 22. On the surface of the output member 3 facing the flange 22, a plurality of grooves 34 are formed in the peripheral portion at circumferential intervals. The groove 34 has a shape of a part of the outer circumference of the roller so as to receive the roller-shaped rolling member. The surface of the thrust washer 5 on the flange 22 side is a smooth radial surface. A large number of balls 61 are provided between the thrust washer 5 and the spring bearing 6 in order to facilitate relative rotation therebetween.

A female screw 71 is formed on the inner surface of the torque adjusting nut 7 in approximately half (upper side in the figure) in the axial direction, and the other half has a smooth cylindrical surface 73. A groove 74 for receiving a tool for rotating the flange 72 of the torque adjusting nut 7 is provided on the outer periphery of the flange 72.
Are formed.

A lock mechanism 9 for a torque adjusting nut is provided in the input member 2.
Is provided. The lock mechanism 9 is opened at one end surface (upper end surface in the figure) formed in the input member 2 and extends in the axial direction, and an axial hole 91 is opened from the axial hole 91 to the outer periphery of the boss portion 21 of the input member. A radial hole 92, a locking member 93 that is movably provided in the radial hole 92 and that engages with the torque adjusting nut 73 to prevent rotation of the torque adjusting nut 7, and an axial hole 91. And a lock screw 96 screwed into a screw 95 formed at the opening of the axial hole 91. The locking member 93 has a ball shape in this embodiment, and a tapered surface is formed at the tip of the rod 94.
The axial hole may be opened on the other end (lower end) surface of the input member depending on the mode of use. Further, the rod and the lock screw may be integrally fixed. The shape of the locking member is not limited to a sphere, but may be a rugby ball shape or any other shape.

In this lock mechanism, when the torque adjusting nut 7 is rotated, the lock screw 96 is loosened, and when the torque adjusting nut 7 is locked, the lock screw 96 is screwed in and the rod 94 is pushed in. The locking member 93 is pushed outward in the radial direction by the action of the tapered surface of the locking member 93, so that the locking member 93 is pressed against the cylindrical surface 73
It is locked with great force. Therefore, the rotation of the torque adjusting nut is prevented.

The operation of the torque limiting device 1 is the same as that of the conventional torque limiting device, and when the load applied to the output member 3 is smaller than the limit torque set by the spring 8, the rolling member 4 moves in the groove 34 of the output member 3. Since the input state is maintained, the torque applied to the input member 2 is directly transmitted to the output member 3 via the rolling member 4. When the load applied to the output member exceeds the set value of the spring 8, the rolling member 4 axially pushes the thrust washer 5 against the pressing force of the spring 8 and comes out of the groove 34 of the output member 3. Therefore, the input member 2 relatively rotates (idles) with respect to the output member 3, and no torque is transmitted to the output member 3.

In FIG. 3, the torque limiting device 1a of the second embodiment is shown. In this embodiment, one end (upper end) of the spring 8a
Directly contacts the thrust washer 5a, and a spring receiver 6a is provided on the other end (lower end) side of the spring. A large number of balls 61a are provided between the spring bearing 6a and the flange 72a of the torque adjusting nut 7a in order to facilitate relative rotation therebetween. Since the torque of the torque adjustment nut is not applied directly to the spring, adjustment is easy and the torque adjustment nut is difficult to loosen.

Further, in this embodiment, the axial hole 91a of the lock mechanism 9a penetrates through the input member 2a in the axial direction, and the lock screw for operating the locking member 93a and / or
The rod can be inserted. That is, the rod 94a and the lock screw 96a are inserted into the long hole in the axial direction as in the above embodiment, and the lock screw 97a having the tapered surface at the tip is screwed into the shorter end to operate one of the lock screws. When doing, the other lock screw should be loosened sufficiently.

Although the boss portion is formed on the input member to rotatably support the output member on the input member in both of the above-described embodiments, the boss portion is formed on the output member to make the input member ring-shaped and rotate on the output member. It may be supported as much as possible. In this case, the torque adjusting nut is screwed onto the output member, and the lock mechanism for that is formed on the output member.

(G) Effect According to the present invention, the following effects can be achieved.

When the torque limiting device is incorporated in the index device or the like, the lock mechanism of the torque adjusting nut can be operated from the upper surface of the table, and the operability is improved.

Safety is improved because the work of putting hands in a narrow space is reduced.

In the case of the second embodiment, the rotational torque of the torque adjusting nut is not transmitted to the spring, so that it is easy to adjust and difficult to loosen.

[Brief description of drawings]

1 is a sectional view of an embodiment of the torque limiting device according to the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view of another embodiment. 1, 1a: Torque limiting device 2, 2a: Input member 3, 3a: Output member 4, 4a: Rolling member 5, 5a: Thrust washer 7, 7a: Torque adjusting nut 8, 8a: Spring 9, 9a : Lock mechanism 91, 91a: Axial hole 92, 92a: Radial hole 93, 93a: Locking member 94, 94a, 96, 96a, 97a: Pressing member

Claims (1)

[Scope of utility model registration request] 1. An input member, an output member that is rotatable relative to the input member, a roll member disposed in a notch formed in one of the input member or the output member, and the input member or A rolling member that is relatively movable together with the other of the output members and that participates in the transmission of torque between the input member and the output member, and the rolling member of the input member or the output member. A spring for elastically pressing the other side, a thrust washer arranged adjacent to the rolling member for transmitting the elastic force of the spring to the rolling member, and screwed to one side of the input member side or the output member. A torque adjusting nut for adjusting the elastic force of the spring, the spring is arranged so as to surround the outer circumference of one of the input member and the output member, and the torque adjusting nut is provided on the input member side or the output side. Formed on one outer periphery of the member In the torque limiting device screwed together, one of the input member and the output member has an axial hole extending axially from the end face and a radial hole extending from the axial hole to the outer periphery of the input member or the output member. A locking member that engages with the inner circumference of the torque adjusting nut is provided in the radial hole, and the locking member is pushed outward in the radial direction in the axial hole to engage with the torque adjusting nut. A torque limiting device comprising a pressing member for fitting.