JP2536766Y2 - Emergency mechanism of power transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an emergency mechanism of a power transmission device for manual operation in the event of a failure or the like.

(Conventional technology and problems)

In general, a power storage device such as that shown in FIG. 4 is provided in a storage cabinet under the floor, a hanging cabinet, or the like that moves a storage body up and down by power. The device 50 includes a worm gear 52 provided on a shaft of a drive motor 51, a worm wheel 53 meshing with the worm gear 52, a pinion 54 rotatable integrally with the worm wheel 53, and geared wires 55a and 55b moved forward and backward by the pinion 54, In particular, the worm gear 52 has, in addition to the deceleration function, a reverse rotation preventing function for preventing the drive motor 51 from rotating reversely due to the weight of the storage body.

By the way, in this type of power transmission device 50, when an abnormality such as a power failure or a failure occurs, the worm gear 52 serves as a stopper, and manual operation becomes impossible. For this reason, an emergency mechanism is provided which enables manual operation even in such a situation.

 FIG. 5 shows a conventional emergency mechanism 60.

The emergency mechanism 60 includes a gear case 61 provided with a bearing portion 62 at the center.A pinion shaft 63 having the pinion 54 at one end is rotatably provided inside the bearing portion 62, and an outer peripheral portion of the bearing portion 62 is provided. The worm wheel 53 is provided rotatably. On the other hand, the pinion shaft 63
The other end of the clutch plate has a non-circular cross section on the middle side.
63a is formed, and a screw portion 63b is formed on the distal end side.
Then, the first clutch plate 64, the second clutch plate 65, and the leaf spring 66 are sequentially fitted into the clutch plate insertion portion 63a, and a fixing nut 67 is screwed into the screw portion 63b. In this case, since a circular hole is formed at the center of the first clutch plate 64, it is rotatable with respect to the pinion shaft 63, and the center of the second clutch plate 65 is the same as the cross section of the clutch plate insertion portion 63a. Since the insertion hole having the shape is formed, the rotation with respect to the pinion shaft 63 is restricted. Further, a plurality of locking pieces 64 s protruding toward the worm wheel 53 are integrally formed on a peripheral portion of the first clutch plate 64. Each of these locking pieces 64s is a worm wheel 5
3 are inserted and locked in a plurality of locking holes 53s.

Therefore, if the fixing nut 67 is tightened, the first clutch plate 64 and the second clutch plate 65 are crimped by friction,
The rotation of the worm wheel 53 is performed by the first clutch plate 64,
The power is transmitted to the pinion shaft 63 via the second clutch plate 65. On the other hand, when a power failure or the like occurs, if the fixing nut 67 is loosened with a tool, the crimp between the first clutch plate 64 and the second clutch plate 65 is released, so the pinion shaft 63
Can be turned by a tool or the like.

However, such a conventional emergency mechanism 60
Since the leaf spring 66 exists even if the fixing nut 67 is loosened,
Between the first clutch plate 64 and the second clutch plate 65, a certain amount of friction acts, and there is a disadvantage that it cannot be easily turned.

Further, after the fixing nut 67 is loosened with a wrench or the like, it is turned with a hexagon wrench or the like, so that two tools and a two-stage operation are required, and the operation is troublesome, and the operation cannot be sped up.

An object of the present invention is to provide an emergency mechanism for a power transmission device that solves the problems existing in the related art.

[Means for solving the problem]

According to the present invention, a transmission shaft 3 for outputting rotation is rotatably arranged at the center of a transmission gear 2 to which rotation is input, and a clutch member is provided between the transmission gear 2 and the transmission shaft 3 so that the transmission gear 2 and the transmission shaft are provided. In the emergency mechanism 1 configured to be able to connect or disconnect the clutch member 3, in particular, the transmission shaft 3 is provided with a clutch member 5 that can rotate integrally with the transmission shaft 3 so as to be freely displaceable in the axial direction. The clutch member 5 and the transmission gear 2 are configured to be mutually locked by displacement of the clutch member 5 to one side, and to be released by displacement to the other side. Along with
A jig attaching / detaching portion 8 using, for example, a screw hole 7 for a jig for displacing and rotating the clutch member 5 to the other side is provided.

[Action]

According to the emergency mechanism 1 according to the present invention, the clutch member 5 can rotate integrally with the transmission shaft 3 and can be displaced in the axial direction, and is biased to one side by the spring 6. Therefore, the clutch member 5 is normally engaged with the transmission gear 2, and the transmission gear 2 and the transmission shaft 3 are normally connected to the clutch member 5.
Connected via Therefore, the rotation is input to the transmission gear 2 and output via the clutch member 5 and the transmission shaft 3.

On the other hand, when an abnormality such as a power failure occurs, a jig M having a screw portion Mo is screwed into the screw hole portion 7 of the jig attaching / detaching portion 8, and if the clutch member 5 is pulled, the urging force of the spring 6 is opposed. The clutch member 5 can be displaced to the other side, and the engagement of the clutch member 5 with the transmission gear 2 is released. Therefore, by operating the jig M, the transmission shaft 3 can be turned,
The rotation by this operation is not transmitted to the transmission gear 2 side.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration of the emergency mechanism 1 according to the present invention will be described in detail with reference to FIG.

Reference numeral 11 denotes a gear case provided with a bearing portion 12 at the center, and a pinion shaft 3a is provided inside the bearing portion 12 via a collar 13.
(Transmission shaft 3) is provided rotatably. Pinion shaft 3a
The pinion 14 has one end at one end, and the pinion 14
° The geared wires 15a and 15b mesh with the opposing positions. In addition, a moving part such as a housing is connected to the distal ends of the geared wires 15a and 15b. A worm wheel 2a (transmission gear 2) is rotatably provided on the outer peripheral portion of the bearing portion 12. The worm wheel 2a and the collar 13 are held by a C-ring 16 locked at a predetermined position on the pinion shaft 3a. On the other hand, the pinion shaft located on the other side than the C ring 16
3a is formed in a non-circular cross section as shown in FIG. 2, and a clutch plate 5a (clutch member 5) is fitted therein. In addition,
An insertion hole having the same shape as the cross-sectional shape of the pinion shaft 3a is formed at the center of the clutch plate 5a. Thus, the rotation of the clutch plate 5a with respect to the pinion shaft 3a is restricted in both directions, that is, the clutch plate 5a can rotate integrally and can be displaced in the axial direction. In addition, locking pieces 17 protruding toward the worm wheel 2a are provided at four peripheral portions of the clutch plate 5a.
Are integrally formed. For this purpose, the worm wheel 2a is formed with locking holes 18 into which the locking pieces 17 are inserted and locked. On the other hand, a stopper plate 19 is fixed to the other end of the pinion shaft 3a, and the coil spring 6 is compressed between the stopper plate 19 and the clutch plate 5a.

On the other hand, a jig attaching / detaching portion 8 is attached to the clutch plate 5a. The jig attaching / detaching portion 8 includes a mounting plate 21 screwed to the clutch plate 5a and a mounting / dismounting nut 22 fixed to the mounting plate 21. The detachable nut 22 has the screw hole 7.

Next, the function of the emergency mechanism 1 will be described.

First, normally, as shown in FIG. 1, the clutch plate 5a is urged by the coil spring 6 toward one side, that is, toward the worm wheel 2a. For this reason, each locking piece 17 is inserted and locked in each locking hole 18 and the worm wheel
2a and the pinion shaft 3a are connected via a clutch plate 5a. Therefore, the rotation of the worm gear (see FIG. 4) on the drive motor side is transmitted to the pinion shaft 3a via the worm wheel 2a and the clutch plate 5a.

On the other hand, when an abnormality such as a power failure or a failure occurs, first, a jig M having a screw portion Mo at the tip as shown in FIG. 3 is prepared. Then, when the screw portion Mo of the jig M is completely screwed into the detachable nut 22, and the jig M is pulled against the elasticity of the coil spring 6, the clutch plate 5a is pulled as shown in FIG. It can be separated from the worm wheel 2a. As a result, the locking pieces 17 are pulled out of the locking holes 18.
The worm wheel 2a and the pinion shaft 3a are separated. Therefore, if the jig M is turned, the pinion shaft 3a can be turned, and manual operation can be easily performed.

Although the embodiments have been described in detail above, the present invention is not limited to such embodiments. For example, the case where the jig attaching / detaching portion uses a screw portion is shown, but another principle such as a fitting type may be used. In addition, details, configurations, shapes, and the like can be arbitrarily changed without departing from the gist of the present invention.

[Effect of the invention]

As described above, the emergency mechanism of the power transmission device according to the present invention provides the transmission shaft with the clutch member rotatable with the transmission shaft 3 so as to be axially displaceable, and the spring for biasing the clutch member to one side. And the clutch member and the transmission gear are configured to be locked to each other by displacement to one side of the clutch member, and to be released by displacement to the other side, and to displace the clutch member to the other side. Since the jig attaching / detaching part for the jig to be rotated and rotated is provided, the following remarkable effects are obtained.

At the time of manual operation, the locked state of the clutch member and the transmission gear can be completely released, and the clutch member can be freed,
Easy manual operation without being affected by friction.

Since the disengagement of the clutch member and the operation of the transmission shaft can be performed simultaneously with a single jig, the number of tools can be reduced by half and the work content can be reduced by half as compared with the conventional case.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a power transmission device provided with the emergency mechanism according to the present invention. FIG. 2 is a sectional view taken along line AA in FIG. 1. FIG. 3 is provided with the emergency mechanism during manual operation. FIG. 4 is a longitudinal sectional view of a power transmission device, FIG. 4 is a principle configuration diagram of the power transmission device, and FIG. 5 is a longitudinal sectional view of a power transmission mechanism provided with an emergency mechanism according to the related art. In the drawing, 1: Emergency mechanism, 2: Transmission gear 3: Transmission shaft, 5: Clutch member 6: Spring, 7: Screw hole 8: Jig attachment / detachment

Claims (2)

(57) [Scope of request for utility model registration] A transmission shaft (3) for outputting rotation is rotatably disposed at the center of a transmission gear (2) to which rotation is input, and a clutch member (3) is provided between the transmission gear (2) and the transmission shaft (3). By providing the transmission gear (2) and the transmission shaft (3), in the emergency mechanism (1) of the power transmission device configured to be able to connect or disconnect the transmission shaft (3), the transmission shaft (3) is attached to the transmission shaft (3). ), A clutch member (5) rotatable in the axial direction is provided, and a spring (6) for urging the clutch member (5) to one side is provided, and the clutch member (5) and the transmission gear (2) are provided. ) Is configured such that the clutch member (5) is locked to each other by displacement to one side, and is disengaged by displacement to the other side, and displaces the clutch member (5) to the other side. And a jig attaching / detaching portion (8) for the jig to be rotated. Emergency mechanism of the power transmission device according to claim. 2. The emergency mechanism of a power transmission device according to claim 1, wherein the jig attaching / detaching portion (8) uses a screw hole (7).