JPS6322341Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention has a rotary damper on one side of the partition board and a one-way clutch on the other side, and the partition board serves both as an output shaft in the rotary damper and as an input shaft in the one-way clutch. This invention relates to a one-way rotary damper that rotatably passes through a shaft.

Spring type, ratchet type, and freewheel type are conventionally known as one-way clutches, as well as improved ratchet type and planetary gear type recently proposed by the applicant, and rotary dampers include oil type. , pneumatic type, and various other types are known. For example, a rotary damper is incorporated into the opening/closing mechanism of a lid-shaped cassette storage case in a video tape record, or the opening/closing mechanism of the lid of a car dash board, so that when a closed lid is opened, the lid suddenly opens due to spring force. If you buffer the
Even when an open lid is pushed closed by hand, the rotary damper acts, making it impossible to close the lid easily. Therefore, in this case, a one-way clutch is also incorporated in addition to the rotary damper, and when closing the lid, the one-way clutch prevents the movement of the lid from being transmitted to the rotary damper, and the rotary damper is used only when opening the closed lid. To do this, the rotary damper and one-way clutch, which are made separately, are combined by connecting the output shaft of the rotary damper to the input shaft of the one-way clutch, and then the opening/closing mechanism is assembled. It needs to be assembled and is very bulky.

Therefore, in the present invention, a one-way clutch is provided on one side of a partition board, and a rotary damper is provided on the other side, and the main shaft, which also serves as the output shaft of the one-way clutch and the input shaft of the rotary damper, passes through the partition board so as to be rotatable. The present invention has been solved, and the present invention will be described below with reference to an embodiment shown in the drawings.

1 is a partition board, 11 is a one-way clutch provided on one side of the partition board, and 21 is a rotary damper provided on the other side of the partition board.

The one-way clutch has internal teeth 14 on the inner periphery of the cylinder wall 13, and a hollow toothed ring 12 that receives rotational input with teeth 15 on the outer periphery of the cylinder wall. A plurality of snap claws 2 stand up on one side of the partition board 1 at positions surrounding the outer periphery of the cylindrical wall, and when the cylindrical wall is pushed into the interior surrounded by the claws, when the end surface of the cylindrical wall comes into contact with the partition board surface, The snap pawl 2 locks a shoulder protruding from the outer peripheral tip of the cylinder wall, and holds the hollow tooth ring rotatably.

An auxiliary plate 16 is provided inside the cylinder wall so as to be relatively rotatable.
A guideway 17 consisting of an arcuate hole or an arcuate groove concentric with the internal teeth is provided in this, and the shaft 19 of the planetary gear 18 that constantly meshes with the internal teeth is inserted into the guideway 17, and the planetary gear 18 is inserted into the guideway. It is designed so that it can be moved inside the cylindrical wall.

Reference numeral 3 denotes a main shaft that rotatably penetrates the circular hole 4 of the partition board, and an output gear 20 that does not mesh with internal teeth is provided at the end of this shaft that protrudes into the cylindrical wall. In other words, the circular hole is opened at a position where the output gear does not mesh with the internal teeth. The tooth profiles of the internal teeth, planetary gear, and output gear are the same, and when the planetary gear is located at one end 17b of the guideway near the output gear, it meshes with the teeth of the output gear as well as the internal teeth, but from this position End 17a
As it moves towards the output gear, it gradually moves away from the output gear,
When it is at the other end 17a, it just meshes with the internal teeth and comes off from the output gear.

Therefore, as shown in FIG. 4, when the planetary gear is located at the end 17a of the guideway and the hollow gear receives rotational input and rotates in the clockwise direction of arrow a, the planetary gear remains at that position. The clutch rotates idly in the same direction, and the clutch is in a disengaged state in which rotation is not transmitted to the output gear, allowing you to easily close an open lid by hand, for example. However, in this state, the hollow tooth ring is
When the planetary gear rotates counterclockwise, the planetary gear revolves in the same direction as the hollow gear and passes through the taxiway at the end 1.
7b, the clutch gradually approaches the output gear and finally meshes with the output gear, rotating the output gear clockwise and bringing the clutch into contact. In this state, when the rotation of the hollow gear changes clockwise, the planetary gear revolves and moves to the end 17a in the guideway, and the clutch becomes disengaged again.

The auxiliary plate is provided with a center shaft 16a that protrudes into the center hole at the bottom of the cylinder wall, and the output gear is provided with a protrusion 20' that protrudes into the eccentric hole 16' of the auxiliary plate. The plate is positioned in the cylindrical wall and prevented from rotating.

A housing 21 for a damper is installed on the other side of the partition panel concentrically with the main shaft 3, and a brake plate 22 that can rotate in the housing is provided at the end of the main shaft that protrudes into the housing. Fill with highly viscous oil 23. Incidentally, if necessary, the brake plate may have holes 24 formed on the plate surface or tooth-shaped cutouts or the like on the edge of the plate in order to enhance the braking effect.

As a result, when the output gear rotates due to rotational input being transmitted through meshing with the planetary gear, the brake plate, which is integrally connected to the output gear by the main shaft, must rotate in the oil 23, so it rotates to the hollow gear. The rotational input that provides this is controlled to buffer against sudden opening of the lid due to spring force, for example.

In addition, in order to prevent oil from leaking into the one-way clutch between the main shaft and the circular hole, a packing 25 is fitted and sealed at the part of the main shaft that protrudes into the housing, and the peripheral edge of the packing is attached to the partition plate and the housing. It is best to sandwich it. Although not shown, the damping plate 22 may be brought into sliding contact with the inner wall of the housing to provide a damping effect without using oil or the like.

In this way, according to the present invention, the mounting arm 5 projecting outward from the partition panel or housing is fixed to the lid side of a video tape recorder or a car dash board, and the teeth on the outer periphery of the hollow gear are attached to the main body side of the recorder or car body. It meshes with the provided sector gear, or it is fixed on the body side with the arm 5, and the teeth on the outer periphery of the hollow gear mesh with the sector gear on the lid side, and when the lid is closed, it is closed using a one-way clutch. The hollow gear and planetary gear rotate freely and can be closed easily by hand.
When opening a closed lid, it can be used to release the lock by operating a push button, and to dampen or dampen the sudden opening of the lid due to spring force. The partition panel also serves as a part of the wall of the one-way clutch and the rotary damper, and the main shaft passing through this serves as the output shaft of the one-way clutch and the input shaft of the rotary damper, which makes it extremely compact and separates the Compared to individually combining a one-way clutch and a rotary damper and assembling them into an opening/closing mechanism, the number of assembly steps is greatly reduced, and the assembly process on the production line is significantly simplified, greatly contributing to improved productivity.

If two guideways are provided symmetrically as shown in the figure, the guideway in which the shaft of the planetary gear is inserted is selected, and the rotational input is braked by clockwise rotation of the hollow gear, and the other by counterclockwise rotation. Two types can be manufactured, one in which rotational input is braked.

Furthermore, the guideway can be formed on the surface of the partition panel as shown by the broken line in Figure 3, and by doing so, the auxiliary plate can be omitted, and if omitted, the overall thickness will be reduced. It can be made thinner and more compact.

Moreover, although the material of each part is arbitrary, weight reduction can be achieved by making all parts molded from plastic.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view showing an embodiment of the present invention, Fig. 2 is a vertical sectional view thereof, Fig. 3 is an exploded perspective view, and Fig. 4 is an explanatory diagram of the operation. 11 is a one-way clutch, 21 is a rotary damper, and 3 is a main shaft.

Claims (1)

[Claims for Utility Model Registration] (1) A hollow toothed ring 12 having internal teeth 14 on the inner periphery of the cylinder wall 13 and external teeth 15 that receive rotational input on the outer periphery is rotatably held on one side of the partition plate 11. In addition, an arcuate guide path 17 is provided inside the hollow gear 12, which is concentric with the rotational axis of the hollow gear, and the planetary gear 1 is constantly meshed with the internal teeth 14 on the inner periphery of the cylinder wall.
8 is movably supported in the guiding path 17, the main shaft 3 is supported through the partition plate 11, and the part of the main shaft 3 that protrudes into the inside of the hollow gear 12 has the above-mentioned Although it is always out of engagement with the internal teeth 14,
An output gear 20 is provided that meshes with the planetary gear 18 when it moves to one end of the guideway 17, and a braking plate 22 is provided on the portion of the main shaft 3 that protrudes from the other side of the partition plate 11, and this braking The board 22,
A one-way rotary damper characterized in that it is attached to the partition panel 11 and surrounded by a housing 21 filled with oil 23. (2) The unidirectional rotary damper according to claim 1, wherein the guideway 17 is provided on one side of the partition panel 11. (3) The one-way rotary damper according to claim 1, wherein the guiding path 17 is provided on an auxiliary plate 16 that is fixed concentrically inside the hollow toothed ring 12.