JPH0336748Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a rotational shock absorber for devices that rotate forward and backward, such as those that automatically open and close opening/closing members such as automobile window glasses and sunroofs by driving a motor. It is related to.

[Problems to be solved by the prior art and the invention] In general, in automatic opening and closing of this type of opening/closing member, a worm gear provided on the drive shaft of the motor is meshed with a helical gear and driven in a decelerating state. However, in such a device, it is necessary to buffer shocks caused when the motor stops or when an overload occurs on the driven side. Conventionally, an elastic material such as rubber is provided on the helical gear by vulcanization bonding or pressure bonding, and the torsion, compression deformation, etc. of the elastic material is used to buffer the impact. However, this method has the disadvantage that the buffering effect is not affected by the vulcanization conditions, and it is difficult to obtain a sufficient buffering effect to buffer the impact torque. Therefore, as shown in Publication No. 59-10439,
A C-shaped spring with a protrusion and first and second rotating bodies are fitted into a cylinder body on which a helical gear is formed on the outer peripheral surface, and the rotational force of the cylinder body by the helical gear is applied to the cylinder body.
There is a device that transmits the impact torque to the first and second rotating bodies via a spring and buffers the impact torque with a C-shaped spring, but this one uses a C-shaped spring with four projections. Rather than having to make it into a special shape, the protrusions are fitted inside the cylinder by engaging grooves formed on both surfaces of the first rotating body, the second rotating body, and the cylinder. It needs to be fitted. however,
In this internal fitting operation, since the protrusions protrude in the outer radial direction, the spring cannot be inserted as is. While resisting the biasing force and sandwiching the cylinder so that it has a small diameter, insert the protrusion on the opposite side from one side of the cylinder to the other,
Moreover, at this time, the protrusion must also be inserted into the groove of the rotating body, making the assembly work extremely complicated and troublesome, and if the diameter of the cylindrical body is made small, the above assembly work becomes even more difficult. Therefore, the diameter of the cylindrical body cannot be freely selected, and this has the limitation that the reduction ratio cannot be freely selected by the helical gear formed on the outer peripheral surface of the cylindrical body. Moreover, if the grooves on the rotary body side that the protrusion engages with do not match the grooves on the cylinder side, and there is play, play will occur between the cylinder and the output shaft, so it is necessary to form the grooves with considerable precision. Therefore, there were problems in that it was necessary to add a separate cutting process, etc.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a rotational shock absorber that can eliminate these drawbacks. A first rotary body consisting of a bottomed annular body that integrally rotates in conjunction with the first rotary body, in which an engaging portion facing inward from the bottom of the rotary body is formed, and a circular arc-shaped body that extends along the inner peripheral surface of the ring of the first rotary body. A spring, which is elastically loaded and has engaging ends facing toward the shaft center at both ends so as to sandwich the engaging portion from both sides, and an output shaft that is interlocked and connected to the driven side are integrally connected to each other. and a second rotating body, which is disposed on the side opposite to the bottom of the first rotating body and has an engaging portion facing toward the first rotating body so as to be sandwiched from both sides by both engaging ends of the spring. and the first rotating body and the second rotating body,
It is characterized by being elastically connected via a spring.

With this configuration, the present invention allows the spring shape to be simplified, is easy to assemble, does not generate backlash, and allows the size of the helical gear to be freely selected. be.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a rotational shock absorber according to the present invention, and the rotation shock absorber 1 includes a helical gear 3 meshing with a worm gear 2 interlocked with a motor (not shown), and a helical gear 3. 3
The first rotating body 4 is integrally fixed to the first rotating body 4, the spring 5 is fitted inside the first rotating body 4, and the second rotating body 6 is opposed to the first rotating body 4. That is, in the helical gear 3, an output shaft 7 interlocked with the driven side is rotatably supported at its axis, while the first rotating body 4 is formed of a bottomed annular body. However, by fitting the protrusion 4b protruding outward from the bottom 4a of the first rotating body 4 into the concave groove 3a formed in the boss portion of the helical gear 3, the helical gear 3 becomes the first rotating body. 4 is integrally fixed to the outer surface of the bottom 4a of both 3,
4 is designed to rotate as a unit. Further, a locking piece 4d is bent and formed on the bottom portion 4a of the first rotary body 4 so as to protrude inside the ring portion 4c.
On the other hand, in this embodiment, the spring 5 is formed by bending a cylindrical bullet into an arc shape.
Both ends thereof are further bent inward from the axis of the first rotating body 4 to form engaging ends 5a and 5b. The spring 5 is inserted into the first rotating body 4 from the opening side (opposite the bottom side) so as to sandwich both sides of the locking piece 4d while engaging the engaging ends 5a and 5b. It is designed to be placed inside along the inner peripheral surface of the ring portion 4c of the body 4.
Further, the second rotating body 6 is arranged on the opening side of the first rotating body 4 so as to close the opening.
The center part thereof is recessed toward the first rotary body 4 side, and the tip of the output shaft 7 is key-fitted into the key hole 6a formed at the center of the recess. It is integrally attached to the two rotating bodies 6, and both 6 and 7 rotate together. Further, an engaging portion 6b is formed on the circumferential wall of the recess, and the engaging portion 4d is inserted into the engaging portion 4d when the opening of the first rotary body 4 is abutted against the second rotary body 6 so as to cover it. The springs 5 and 5 face each other so as to overlap on the axis side, and the engaging ends 5a and 5b of the spring 5 are sandwiched and engaged with each other on both sides thereof, and in this way, the first rotating body 4 and the second rotating body 6 are elastically connected via a spring 5.

In the embodiment of the present invention configured as described above, the rotation of the worm gear 2 in conjunction with the drive of the motor causes the first rotating body 4 together with the helical gear 3 to move in the direction of arrow A, that is, one engagement end of the spring 5. Part 5
a engages with the engaging portion 4d of the first rotating body 4, and the other engaging end 5b rotates in the direction of engaging with the engaging portion 6b of the second rotating body 6. , said A
The rotational force in the direction A is elastically transmitted from the first rotary body 4 to the second rotary body 6 side via the spring 5, whereby the second rotary body 6 rotates in the A direction and the output shaft 7 is rotated. This will cause the rotation to take place. Also, the reverse B
With regard to the rotation in the direction, elastic power transmission is performed from the first rotating body 4 to the second rotating body 6 via the spring 5 in an engagement relationship opposite to that described above, and on the driven side, the glass window is Reciprocating operations such as opening and closing will be performed.

In such an operation on the driven side, when it is rotating in the A direction as described above, some kind of overload is applied from the driven side and the rotation of the output shaft 7 is suddenly restricted and stopped. In this case, the first rotating body 4 attempts to further rotate due to the driving force from the motor side. In this case, in the present invention, when the second rotating body 6 stops, the spring 5
is in a state where the other engaging end 5b side is fixed, and one engaging end 5a moves elastically in the direction of reducing the diameter of the spring 5 in the A direction according to the rotational force of the first rotating body 4. In this way, it is possible to provide a buffering effect in the event of an emergency stop due to an overload applied to the driven side. This buffering effect acts in the same way whether the helical gear 3 rotates in the forward or reverse direction, in the opposite relationship to the above.

In this way, in the present invention, by elastically linking each other through the spring 5, it is possible to transmit power with a buffering effect between the first rotating body 4 and the second rotating body 6. However, the spring 5 has a pair of engaging ends 5a and 5b facing in the axial direction at a position inside the ring portion 4c of the first rotating body 4, and the spring 5 is connected to the first rotating body 4 side. The structure can be extremely simple in that the locking piece 4d and the locking portion 6b on the second rotary body 6 are sandwiched and engaged from both sides. There is no need to create a special device at all, and the spring 5 can be easily formed by simply bending the bullet, making it possible to form the spring 5 extremely easily and at low cost.

Moreover, as shown in FIG. 3, the rotational shock absorber 1 can be assembled by simply stacking the helical gear 3, the first rotating body 4, the spring 5, and the second rotating body 6. Even if the first rotating body 4 is made small in diameter, the assembly work is extremely simple and work efficiency can be greatly improved. In addition, the engagement relationship of the spring 5 and the like can be completely internalized within the first rotary body 4, so that there is no protrusion as in the conventional case, and therefore, the helical gear 3 Since a separate device can be attached to the outer surface of the bottom portion 4a of the first rotor 4 instead of the outer peripheral surface of the rotor 4, in this case, the reduction ratio by the helical gear 3 can be adjusted to the first rotation. This further provides the effect that it can be freely selected regardless of the size of the body 4.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, but essentially consists of a bottomed annular body that integrally rotates in conjunction with the forward and reverse drive of the motor.
A first rotating body has an engaging portion formed thereon facing inward from the bottom of the rotating body, and the first rotating body is elastically mounted in an arc shape along the inner circumferential surface of the ring, and the engaging portion is provided at both ends of the first rotating body. A spring having an engaging end facing toward the shaft core and an output shaft interlockingly connected to the driven side are integrally attached, and are arranged on the side opposite to the bottom of the first rotating body. and a second rotating body formed with an engaging portion facing toward the first rotating body so as to be sandwiched between both engaging ends of the spring from both sides, and the first rotating body and the second rotating body are connected to each other. , the structure and shape of the first rotating body, the spring, and the second rotating body are not limited to any means as long as they are elastically connected via a spring. Needless to say, it is not permissible to separately fix it to the side surface of the body, but it may be formed on the outer periphery of the first rotating body. Further, the spring may be formed by cutting a steel plate into a required shape and then bending it.

[Operations and Effects] In short, the present invention is configured as described above, so that the first rotating body interlocked with the motor side and the second rotating body interlocked with the driven side are elastically connected via a spring. Although the two rotating bodies are connected in an interlocking manner so as to have a shock-absorbing effect, the spring has a pair of engaging ends facing toward the shaft center and is connected from both sides to the engaging portions provided on both rotating bodies. Since it is sufficient to lock the spring by pinching it, the shape is simple, and the spring can be formed by an extremely simple method such as simply bending the bullet, making it possible to form a spring using a special method unlike the conventional one. There is no need to do so. Moreover, the installation of the rotational shock absorber is
Since the first rotating body, spring, and second rotating body can be simply stacked, assembly is extremely easy even if the first rotating body has a small diameter, and work efficiency is greatly improved. becomes. Furthermore, the engagement relationship between the first and second rotary bodies by the spring can be constructed such that the entire engagement is internalized within the first rotary body, so that the outer surface of the bottom of the first rotary body is connected to the helical gear. It can be used as a mounting surface, so the reduction ratio by helical gear can be
It is also possible to consider the effect that it can be freely selected without being affected by the diameter of the first rotating body.

[Brief explanation of drawings]

The drawings show an embodiment of the rotational shock absorber according to the present invention, in which FIG. 1 is a partially cutaway front view of the rotational shock absorber, FIG. 2 is a longitudinal sectional view, and FIG.
The figure is an exploded perspective view, and FIG. 4 X, Y, and Z are action explanatory views. In the figure, 1 is a rotational shock absorber, 3 is a helical gear,
4 is a first rotating body, 5 is a spring, 6 is a second rotating body, and 7 is an output shaft.

Claims (1)

[Claims for Utility Model Registration] 1. A first rotary body consisting of a bottomed annular body that integrally rotates in conjunction with forward and reverse drive on the motor side, and in which an engaging portion is formed from the bottom of the body toward the inside of the ring; Bullet-loaded in an arc shape along the inner peripheral surface of the ring of the first rotating body,
A spring having engaging ends facing toward the axis side so as to sandwich the engaging portion from both sides is integrally attached to the output shaft, which is interlockingly connected to the driven side. a second rotating body, which is disposed on the side opposite to the bottom of the first rotating body, and has an engaging portion facing toward the first rotating body so as to be sandwiched between both engaging ends of the spring from both sides; A rotational shock absorber characterized in that a first rotating body and a second rotating body are elastically connected via a spring. 2. The integral rotation of the first rotating body in conjunction with the forward and reverse drive of the motor side is achieved by integrally fixing the helical gear, which is engaged with the worm gear connected to the motor side, to the bottom outer surface of the first rotating body. The rotational shock absorber according to claim 1, which is characterized in that the rotational shock absorber is constructed by performing the following steps.