JPH0665626U - Coupling - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a coupling capable of absorbing the impact force when the rotation of the driven side shaft is stopped. [Structure] A pair of circular shafts 3, 3 are formed at both ends of a torsion member 1 made of synthetic resin, and the circular shafts 3, 3 are formed.
The axial length of the central portion 4 between them is made longer than the axial length of the circular shaft portion 3, and the cross-sectional area is made smaller than the cross-sectional area of the circular shaft portion 3. The circular shaft portion 3 is provided with a shaft insertion hole 5 that extends in the axial direction from the end surface and a screw hole 6 that communicates with the shaft insertion hole 5 from the outer peripheral surface. Screw holes 7 communicating with the screw holes 6 are formed in the metal rings 2 and 2 fitted into the circular shaft portions 3 and 3, respectively. By tightening the screw 8 that is screwed into each screw hole 7, the shaft insertion hole 5
The shafts S ₁ and S ₂ inserted in the are fixed. The torsional deformation of the central portion 4 of the torsion member 1 buffers the impact force when the rotation of the driven side shaft is stopped.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a biaxial coupling coupling arranged in the axial direction.

[0002]

[Prior art]

 As shown in FIG. 4, a damper opening / closing device for providing a damper 11 in the duct 10 to rotatably support the duct 10 and rotating the damper 11 to open / close the duct 10 as shown in FIG. There is a motor 12 in which the damper shaft 11a of the damper 11 is rotated. In this case, it is necessary to connect the rotating shaft 12a of the motor 12 and the damper shaft 11a of the damper 11 with the coupling A.

Here, if the coupling A integrally and firmly connects the rotary shaft 12a and the damper shaft 11a, the damper 11 shown in FIG. 4 is rotated in the closing direction to be installed in the duct 10. When the damper 11 is brought into contact with the stopper 13, there is a risk that the damper 11 impacts against the stopper 13 and damages the damper 11 and the stopper 13. Further, there is a problem that the damper 11 is separated from the stopper 13 due to the reaction force at the time of contact, and the damper 11 cannot be held in the fully closed state.

In order to solve such a problem, there has been conventionally proposed a coupling that buffers an impact force and allows the damper 11 to elastically contact the stopper 13.

6 and 7 show a coupling having a cushioning function. In this coupling, the torque transmitting members 22 and 23 made of metal are screwed to the opposite ends of the two shafts 20 and 21, and a plurality of claws 22a and 23a are provided on the outer peripheral portions of the opposite end faces of the torque transmitting members 22 and 23, respectively. An elastic body 24 made of rubber or the like is incorporated between the facing portions of the torque transmitting members 22 and 23, and a plurality of projecting portions 24a provided on the outer periphery of the elastic body 24 are provided between the claws 22a and 23a facing each other in the circumferential direction. The protrusion 24a is elastically deformed to absorb the impact force when the shaft stops rotating, and the elasticity of the protrusion 24a elastically presses the damper 11 against the stopper 13 to fully close the damper 11. I try to hold it.

[0006]

[Problems to be solved by the device]

 By the way, in the above coupling, when torque is transmitted between the pair of rotary shafts 20 and 21, the protrusion 24a of the elastic body 24 is always subjected to a compressive force, which easily causes fatigue and has a problem in durability. .

Further, since the protrusion 24a of the elastic body 24 is assembled between the claws 22a and 23a that are opposed to each other in the circumferential direction, backlash occurs at the fitting portion, and smooth torque transmission cannot be performed. There is.

The present invention has a technical problem to solve the above-mentioned conventional problems and to provide a coupling having excellent durability that can effectively absorb an impact force when rotation is stopped.

[0009]

[Means for Solving the Problems]

 In order to solve the above problems, in the present invention, a circular shaft portion is provided at both ends, the axial direction of the central portion between the circular shaft portions is made longer than the circular shaft portion, and the cross-sectional area is circular. It consists of a synthetic resin torsion member smaller than the cross-sectional area of the shaft and a pair of metal rings fitted to the circular shaft of the torsion member. A shaft insertion hole extending in the axial direction and a screw hole reaching from the outer peripheral surface to the shaft insertion hole are provided, a screw hole communicating with the screw hole is formed in each metal ring, and a pair of shaft fixings screwed into each screw hole. We adopted a configuration that included the screws.

[0010]

[Action]

 In the coupling having the above structure, the shafts are inserted into the shaft insertion holes of the pair of circular shaft parts, and the shafts are fixed by tightening the screws screwed into the screw holes of the metal ring.

When torque is transmitted between a pair of shafts, when the driven side shaft is stopped, the central portion of the torsion member is twisted and deformed, and due to the twisted deformation, the impact of the driven side shaft when rotation stops Power is absorbed.

[0012]

【Example】

 An embodiment of this invention will be described below with reference to FIGS.

As shown, the coupling according to the present invention comprises a torsion member 1 and a pair of metal rings 2 and 2.

The torsion member 1 is made of elastic synthetic resin such as Duracon. This torsion member 1 has a pair of circular shaft portions 3 and 3 that can be inserted inside the metal ring 2 at both ends, and a central portion 4 between the circular shaft portions 3 and 3 is a circular shaft portion 2. More torsional elasticity.

In order to make the torsional elasticity of the central portion 4 larger than that of the circular shaft portion 2, here, the sectional shape of the central portion 4 is made to be a cross shape, and the sectional area is made smaller than that of the circular shaft portion 2. The length in the direction is made longer than the axial length of the circular shaft portion 2. The central portion 4 may be in the form of a thin plate or a shaft having a diameter smaller than that of the circular shaft 3.

The circular shaft portion 3 of the torsion member 1 is provided with a shaft insertion hole 5 extending in the axial direction from the end surface and a screw hole 6 communicating with the shaft insertion hole 5 from the outer peripheral surface.

Each of the metal rings 2 is fitted to the circular shaft portion 2 of the torsion member 1. A screw hole 7 communicating with the screw hole 6 is formed in the metal ring 2, and a screw 8 is screwed into the screw hole 7.

In the coupling having the above structure, the shafts S ₁ and S ₂ are inserted into the shaft insertion holes 5 of the torsion member 1 and the screws 8 screwed into the screw holes 7 are tightened to form the respective shafts S ₁ and S _2. To fix.

Now, for example, when the rotational force of the motor is applied to _one shaft S ₁ , the rotation is transmitted to the other shaft S ₂ via the coupling.

When torque is transmitted between the two shafts S ₁ and S ₂ , when a shock force that stops rotation is applied to the driven shaft S ₂ , the torsion member 1 is twisted and deformed in the central portion 4. Due to the twist deformation, the impact force when the rotation of the driven side shaft S ₂ is stopped is absorbed.

[0021]

[Effect of device]

 As described above, in the present invention, when an impact force for stopping rotation is applied to the driven shaft, the central portion of the torsion member is twisted and deformed, so that the damper opening and closing device shown in FIG. The impact force when the damper is brought into contact with the stopper can be effectively absorbed, and the damper can be elastically pressed against the stopper to be in a fully closed state. In addition, since the torsionally deformable torsion member is made of synthetic resin, it has excellent durability, and since the torsion member and shaft are connected by tightening the screw that engages the screw hole of the metal ring, there is no rattling. Connection is possible, and rotational torque can be transmitted smoothly between the two axes.

Further, since the screw hole for screwing the screw is formed in the metal ring, the screwing strength is higher than that in the case where the screw hole is formed in the torsion member, and the shaft is firmly connected to the torsion member. can do.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a coupling according to the present invention.

FIG. 2 is a vertical sectional front view of the same.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view of a damper opening / closing device.

FIG. 5 is a perspective view of a damper drive device.

FIG. 6 is an exploded perspective view showing a conventional coupling.

FIG. 7 is a sectional view of the above coupling.

[Explanation of symbols]

 1 Torsion Member 2 Metal Ring 3 Circular Shaft Part 4 Intermediate Part 5 Shaft Insertion Hole 6 Screw Hole 7 Screw Hole 8 Screw

Claims (1)

[Scope of utility model registration request] 1. A composite having circular shaft portions at both ends, wherein a central portion between the circular shaft portions has an axial direction longer than that of the circular shaft portions and a cross-sectional area smaller than that of the circular shaft portions. A torsion member made of resin and a pair of metal rings fitted to the circular shaft portion of the torsion member, a shaft insertion hole extending axially from the outer end surface to each circular shaft portion of the torsion member, and an outer peripheral surface. And a screw hole reaching the shaft insertion hole from each other, forming a screw hole communicating with the screw hole in each metal ring, and having a pair of screws for fixing the shaft screwed into each screw hole.