JPS6142986Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a gear type damper used for damping moving parts (load members) in video decks and other equipment.

(Prior art) For example, in a video deck, when loading or unloading a tape, the tape accommodating part, which serves as a load member, is made to protrude outside the deck by a spring force, and by applying resistance to this spring force, the tape accommodating part is gently protruded. A gear type damper is used to achieve this.
Conventionally, this gear type damper consists of a spur gear transmission mechanism in which a large number of spur gears are meshed and connected in the direction of increasing speed sequentially from the first stage, and this is interlocked and connected to the loading/unloading mechanism of the tape storage section, and the operation of the loading/unloading mechanism is (when operating in the direction of protruding the tape storage section),
By inputting the operating force to the damper, the gear mechanism is configured to apply resistance to the insertion/removal mechanism.

However, such a conventional gear type damper using a group of spur gears has the following drawbacks.

(a) Since the speed increasing efficiency is poor considering the space occupied by the gear, the structure is large and assembly is troublesome.

(b) The rotation of the final stage gear tends to become unstable due to foreign matter getting caught in the final stage gear, which rotates at the highest speed and has the smallest rotational torque, or due to interference between the gears' teeth, which can cause the damper to operate. less certain and reliable.

(c) The damper action fluctuates due to variations in the force (spring constant) of the spring as a driving source and changes over time.

(d) Gear noise is especially loud due to the high speed rotation of the final stage gear.

(Purpose of the invention) Therefore, the present invention provides a damper that has a compact structure, is easy to assemble, has a high damping effect, has excellent operation certainty and reliability, and has low gear noise. .

(Structure of the invention) The feature of the invention is that it is a damper that provides resistance to the spring force that operates a load member such as a tape storage section, and the spring force is applied as a rotational force to one end of the sun axle. An input section is provided, a plurality of sun gears are rotatably provided along the sun axle along the axial direction, and a plurality of planetary gears are meshed around each of the sun gears to form a plurality of stages in the axial direction. The planetary gear units of the first stage in each of the planetary gear units are pivotally supported on the input section, and the planetary gears of the second and subsequent stages are connected to each other's previous stage units. Each of these planetary gear units is inserted into a damper case equipped with an internal gear with each planetary gear meshing with the internal gear, and each planetary gear unit is inserted into the final stage sun gear. This damper is made up of a series of impellers that provide rotational resistance to the final stage sun gear due to wind pressure as it rotates.

Each planetary gear of the first-stage planetary gear unit in the gear unit is pivotally supported by the input section, and each planetary gear of the second-stage and subsequent stages is pivotally supported by the sun gear of the unit in the previous stage, and each of these planetary gears is A damper is provided in which a gear unit is inserted into a damper case equipped with an internal gear with each planetary gear meshing with the internal gear, and an impeller is connected to a sun gear at the final stage. .

(Example) In the figure, 1 is a damper case, in which an internal gear 2 is integrally formed on the inner peripheral surface, and attachment parts 3, 3 for a machine frame such as a video deck are integrally provided at one end. . The damper case 1 may have a peripheral wall formed simply in a cylindrical shape, but in the illustrated embodiment, in order to enhance the soundproofing effect, an inner wall 4 and an outer wall 5 are formed in a concentric cylindrical shape and are connected at one end. A double wall structure is formed with a hollow space between the two walls 4 and 5. The internal gear 2 is integrally provided on the inner peripheral surface of the internal wall 4. Also, damper case 1
At the rear end opening, an inner cover 6 and an outer cover 7 are attached to the inner wall 4 and the outer wall 5, respectively, with a certain space remaining between the two covers 6 and 7.

8 is a sun axle, and the front end of the shaft 8 is equipped with an input section. That is, the driven wheel 10 is attached to the vicinity of the front end of the sun axle 8, and the input wheel 9 is rotatably fitted in front of the sun axle 8, and the driven wheel 10 and input wheel 9 will be described in detail later. An input section is constructed by interlocking and connecting via the one-way spring clutch 16 described above. These driven vehicles 1
0 and the input wheel 9 are each rotatably fitted into the front end opening of the damper case 1, and the rear end of the sun axle 8 is rotatably supported in the center of the lids 6, 7. In this way, the sun axle 8 is rotatably disposed in the center of the damper case. The damper case 1, the lids 6 and 7, the driven wheel 10, and the input wheel 9 are each made of a synthetic resin having high strength and appropriate elasticity, such as polyacetal.

The input wheel 9 is integrally connected with an input piece 11,
A protrusion 12 for connection to an operating part of the equipment is also integrally molded at the end of the input piece 11. 13 is a reinforcing metal cap fitted onto the protrusion 12.

Ring-shaped recesses 14 and 15 are provided at corresponding positions on the back surface of the input wheel 9 and the front surface of the driven wheel 10, and the one-way spring clutch 1 is inserted between the two recesses 14 and 15.
There are 6. This spring clutch 16 transmits rotation of the input wheel 9 in only one direction to the driven wheel 10.
That is, in the mechanism for taking in and out the tape storage section of the video deck described above, the input wheel 9 is activated only when an operating force is applied to the input wheel 9 via the input piece 11 in the direction in which the tape storage section protrudes from the mechanism.
The rotation is transmitted to the driven vehicle 10. In this case, in order to avoid a situation where the facing portion of the input wheel 9 and the driven wheel 10 is worn out and the spring gets wedged there, the spring clutch 16 is made of a wire rod with a square cross section, and the spring clutch 16 is Metal rings 17 and 17' are interposed between the input wheel 9 and the driven wheel 10, respectively. This metal ring 1
7, 17' are connected to the input wheel 9 and the driven wheel 10 by engagement between a groove-shaped notch 18 provided at one location in the circumferential direction of each and a protrusion 19 provided on the inner peripheral surface of the recesses 14, 15. It is prevented from rotating. Note that this one-way clutch is the same as the spring clutch 1.
Various changes other than 6 can be made. Furthermore, depending on the application of the damper of the present invention, such a clutch may not be provided and the input wheel 9 and the driven wheel 10 may be directly connected.
Alternatively, it may be formed integrally. In addition to this, the structure of the input section can be changed in various ways within a range that satisfies the predetermined mechanism. On the other hand, planetary axles 20 are placed at regular intervals at three locations around the back of the driven vehicle 10...
are integrally protruded.

21, 22, 23 are sun gears, and the sun gears 21, 22 other than the final stage sun gear 23 have a main part 24 with teeth, and three planetary axles 26 in the peripheral part, like the driven wheel 10. It is formed by integrally connecting a protruding disk-shaped portion 25. Further, in the final stage sun gear 23, an impeller 27 is integrally connected to a main portion 24 provided with teeth, and the impeller 27 is provided with a plurality of radially arranged blades 28. It is formed into an appropriate shape that can easily receive wind pressure in the direction of rotation.
The sun gears 21, 22, 23 are rotatably fitted to the sun axle 8 with thrust washers 29 interposed between them, and the impeller 27 connected to the final stage sun gear 23 and the A thrust washer 29 is also interposed between the inner cover 6 and the inner cover 6. These thrust washers 29 are made of a material with a small coefficient of friction, such as a Teflon sheet, and reduce the friction between the sun gears. On the other hand, the final stage impeller 2
A thrust bush 30 made of synthetic resin such as polyacetal is fitted inside the sun gear 23 with a 7-piece. This thrust bush 30 is connected to the impeller 2.
It is formed longer in the axial direction than the sun gear 23 with 7,
This prevents the sun gear 23 with the impeller 27 from being directly compressed by the thrust washers 29, 29 on both sides.

Around each of the sun gears 21, 22, 23, three planetary gears 31, 32, 33 are arranged at equal intervals in the circumferential direction.
..., 32..., 33... for each sun gear 21, 22, 2
3 and the internal gear 2 of the damper case 1.

In this way, a planetary gear unit consisting of one sun gear, three planetary gears, and an internal gear is created.
_U1 to _U3 are arranged in three stages in the axial direction with common internal gears, and an impeller 27 is coaxially connected to the sun gear 23 of the final stage unit _U3 . . Each planetary gear 31 in the first stage planetary gear unit _U1 adjacent to the input section...
are rotatably supported on the planetary axles 20... of the input part driven wheels 10, and the planetary gears 32..., 33... of the units _U2 , _U3 in the second and subsequent stages are connected to the sun gears 21, 22 in the previous stage units, respectively. It is rotatably supported by planetary axles 26. With such a configuration, the rotation of the input part driven wheel 10 is first transmitted to the planetary gears 31 of the first stage unit _U1 , and the planetary gears 31 revolve around the sun gear 21 while rotating on their own axis. Accordingly, the sun gear 21 rotates, and this rotation causes the planetary gear 32 of the second stage unit _U2 ...
In the same way, the final stage unit
The speed is gradually increased and transmitted to the sun gear 23 of _U3 . In this case, the speed increasing ratio in each stage unit is for each sun gear 21, 22, 23, planetary gear 3
1, 32, 33 and the number of teeth of the internal gear 2. For example, set the number of teeth for both the sun and planetary gears to 15,
Assuming that the number of teeth of the internal gear 2 is 45, the speed increasing ratio of each stage unit is 4. The final speed increase ratio of the whole, ie, the ratio of the rotation speed of the input section driven wheel 10 to the rotation speed of the final stage sun gear 23, is the product of the speed increase ratios of the individual units. In addition, resistance due to wind pressure according to the rotation speed of the sun gear 23 is applied to the impeller 27 connected to the final stage sun gear 23, and the synergistic value of this resistance and the final speed increase ratio is the damper. This results in resistance as a whole.

In addition, both sun and planetary gears 21-23, 31-3
3 is desirably molded from the same synthetic resin as the damper case. In this way, the cost can be reduced, and the noise of fitting into each other can be reduced. However, in the present invention, even if each gear is made of metal, the intended purpose can be sufficiently achieved.

When assembling this damper, each planetary gear unit including the impeller 27 is assembled around the sun axle 8.
Assemble U ₁ to _{U 3} in a predetermined state, and put them in a state where the planetary gears 31 to 33 of each stage mesh with the internal gear 2,
The input part driven wheel 10 fixed to the sun axle 8 is inserted into the damper case 1 from the back side, and then the inner cover 6 and the outer cover 7 are fitted into the opening on the back side of the case. On the other hand, the input wheel 9 is fitted onto the case 1 and the sun axle 8 from the front side of the damper case 1, and the spring clutch 16 is assembled at this time. As described above, since this damper is equipped with all gears around one sun axle 8, assembly becomes very easy.

Further, this damper is incorporated, for example, into the loading/unloading mechanism of a video tape storage section as shown in FIG. That is, in the figure, 34 is a tape storage part as a load member, 35 and 36 are operating links for taking in and out of the tape storage part, 37 is a drive link, and a spring 38 is connected to the drive link 37.
The drive link 37 is rotated by the force of the spring 38, and the tape accommodating portion 34 is projected to the outside of the deck by the operation of both operating links 35 and 36 in conjunction with this. In this mechanism, the input piece 11 of the main damper is interlocked and connected to the drive link 37, so that the rotational force of the drive link 37 is input to the main damper via the input piece 11, and in this state, the main damper is installed inside the video deck. It is attached to an appropriate part of the damper case 1 via attachment parts 3, 3.

When the rotational force of the drive link 37 is input to the damper, the input wheel 9 rotates, and the rotational force is transmitted to the driven wheel 10 via the one-way spring clutch 16. As described above, this rotational force is transmitted to the plurality of planetary gear units U ₁ to _{U 3} while being gradually increased in speed, and resistance is generated against the drive link 37 due to the rotational force transmission action in the direction of speed increase. Furthermore, the wind pressure resistance applied to the impeller 27 connected to the final stage sun gear 23 is added to the basic resistance due to the gear. Therefore, the load on the spring 38 increases, and the tape accommodating portion 34 gradually protrudes. In this case, as long as the above-mentioned resistance does not exceed the force of the spring 38, the tape accommodating portion 34 will protrude more slowly as the speed increasing ratio increases and as the wind pressure resistance applied to the impeller 27 increases.

According to this damper with such a configuration, since it uses a multi-stage planetary gear mechanism, the damper itself is originally compact, and compared to conventional spur gear mechanisms, (1) speed increase efficiency is much higher; (2) When a planetary gear mechanism is viewed as a power transmission device, it has a disadvantage (power transmission loss) because the tooth meshing ratio is large and therefore the meshing resistance is large, so the braking effect due to tooth meshing is However, the damper effect is enhanced due to the fact that the damper is synergized with the braking action due to speed increase, and it can be made much smaller than the conventional product even though it has the same damping effect as the conventional product.

Further, by providing the impeller 27 in series with the final stage sun gear 23, the following advantages can be obtained compared to a case where the impeller 27 is not provided and a simple multi-stage planetary gear mechanism is used.

In other words, the role equivalent to the final stage sun gear unit in the case of a simple multi-stage planetary gear mechanism is
For example, a simple multi-stage planetary gear mechanism would require a four-stage planetary gear unit, but only three stages would be required to provide the same level of damping capacity. The number of gears can be reduced, thereby making manufacturing and assembly even simpler. Moreover, the impeller 27 makes rotational movement smooth. In addition, the sun gear of the final stage unit rotates at extremely high speed and the rotational torque decreases in inverse proportion to the number of rotations, so if a foreign object gets caught in the gear, rotation will stop due to the slight resistance. However, by using the impeller 27 here, foreign objects are less likely to get caught, and the reliability and reliability of the operation are increased. Further, the wind pressure applied to the impeller 27 connected to the final stage sun gear 23 increases in accordance with the number of rotations of the sun gear 23, and the braking action is accordingly increased.
In terms of the ejection operation, the closer the tape accommodating portion 34 is to the end of the movement range in the ejection direction, the more the braking action is increased and the ejection speed is suppressed, thereby increasing the damping effect at the end stop position. In this way, an even more desirable function as a damper used in this type of application can be obtained.

In addition, in the damper of the present invention, all the gears and the impeller 27 are housed in the damper case 1, so
The meshing noise of gears is less likely to leak outside. Furthermore, if the damper case 1 has a double wall structure as shown in the embodiment, the vibration of the inner wall 4 will be less likely to be transmitted to the outer wall 5, thereby further enhancing the soundproofing effect.

On the other hand, in addition to using the impeller 27 as described above to prevent foreign objects from being caught, in the embodiment, the thrust bush 30 is used to prevent the sun gear 27 with the impeller 27 in the final stage having a small rotational torque.
This prevents unnecessary clamping pressure from being applied during rotation, further increasing operational reliability. That is, even if axial thrust acts from the first and second stage sun gears 21 and 22 toward the final stage sun gear 23 as it rotates, the thrust bushing formed longer than the sun gear 23 with the impeller 27 30, a gap is secured between the thrust washers 29, 29 on both sides and the sun gear 23 with the impeller 27, thereby preventing the gear 23 from being squeezed.

In addition, in the case of this damper, each stage unit U ₁ ~
There is no particular starting point or end point for the rotation of U ₃ , and there is no problem in operation no matter where the circumferential position of the input piece 11 connected to the input wheel 9 is. Any position within a 360° range can be selected depending on the position of the drive link 37 of the tape storage section loading/unloading mechanism. Since the circumferential position of the input piece 11 is not restricted in this way, it can be easily incorporated into a video deck.

Note that the number of planetary gears 31 to 33 in the sun gear units U ₁ to _{U 3} of each stage is not limited to the three mentioned above, and can be selected as appropriate depending on the relationship with the internal gear 2 and the sun gears 21 to 23. Incidentally, the number of stages of the planetary gear unit can also be changed as appropriate. Furthermore, the present invention can be widely applied not only to the mechanism for loading and unloading the tape storage section of the video deck described above, but also as a shock absorber for the operating section of various types of equipment.

(Effects of the invention) As explained above, the damper of the invention is very easy to assemble and has a compact structure, which requires less space for installation into equipment and suppresses gear noise. can do. In addition, by adopting a multi-stage planetary gear mechanism, it is possible to increase speed increasing efficiency and gear meshing resistance, which are important for damper action. Moreover, since an impeller is connected to the final stage sun gear of the sun gear mechanism,
The damper action is increased by the wind pressure applied to this impeller as it rotates, and in addition to providing the desired damping capacity, the number of gears can be reduced, making the structure and assembly simpler, and the braking action is improved as the operation progresses. As a result, a desirable operating function as a damper is obtained. In addition, while increasing the damper action as described above, unbalanced forces are not applied to the gears, and foreign objects are prevented from getting caught in the final stage where the rotational torque is small, ensuring reliable operation. It has many excellent effects such as improved reliability and improved reliability.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is an enlarged sectional view, Fig. 2 is a sectional view taken along the line of Fig. 1, and Fig. 3 is a sectional view taken along the line of Fig. 1.
FIG. 4 is an exploded perspective view, and FIG. 5 is a schematic side view showing how it is assembled into a tape storage section loading/unloading mechanism in a video deck. 1... Damper case, 2... Internal gear, 8...
Sun axle, 10...Input section, _U1 - _U3 ...Planetary gear unit, 21-23...Sun gear, 27...
Impeller, 31-33... Planetary gear, 34... Tape storage section (load member), 38... Spring.

Claims (1)

[Scope of utility model registration request] The damper is a damper that provides resistance to the spring force that operates a load member such as a tape accommodating part, and is provided with an input part to which the spring force is applied as a rotational force at one end of the sun axle, and is provided along the sun axle in the axial direction. A plurality of sun gears are each rotatably provided, and a plurality of planetary gears are meshed around each of the sun gears to form a planetary gear unit having multiple stages in the axial direction. Each planetary gear of the first-stage planetary gear unit is pivotally supported to the input part, and each planetary gear of the second-stage and subsequent stages is pivotally supported to the sun gear of the unit in the previous stage, and each of these planetary gear units is , each planetary gear is inserted into a damper case equipped with an internal gear in a state where it meshes with the internal gear, and at the same time, the wind pressure accompanying the rotation is applied to the final stage sun gear. A damper characterized by a series of impellers that provide rotational resistance.