JPH0442590Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is often used for the opening/closing parts of audio equipment cassette covers, TV knob covers, OA equipment, etc.
The present invention mainly relates to a damper for braking the opening speed of opening/closing parts.

[Conventional technology]

When an eject button or the like is operated, the cassette cover, TV knob cover, etc. are automatically opened by being biased by a spring or the like. These opening/closing parts are equipped with a damper to prevent shocks from occurring due to the high opening speed at the open end, especially when opening.

Generally, this type of damper includes a rotating member and a support member that supports the rotating member, and applies a brake to the rotation of the rotating member by interposing grease, which is a viscous substance, in the sliding gap between the rotating member and the supporting member. Many are used in the form of giving.

The rotating member includes a gear member, which is a power transmission member, and a shaft member, and the gear member and the shaft member are integrated with the gear member coaxially fixed to the shaft member. The gear member and shaft member are generally made by cutting a part of the shaft member to provide a flat part, fitting the gear member to this flat part to prevent co-rotation, and further preventing the gear member from coming off by heat caulking. I'm here.

However, when thermal caulking is used to prevent the gear member from coming off as described above, there is a problem in that a device for thermal caulking is required and the work is time-consuming.

[Problem that the invention attempts to solve]

In consideration of the above facts, the present invention aims to provide a damper that can reliably prevent a power transmission member such as a gear member from coming off without using any special equipment and with simple work.

[Means for solving problems]

The damper according to the present invention includes a rotating member and a supporting member that supports the rotating member, and a viscous substance is interposed in a gap between the rotating member and the supporting member, and a protruding shaft member; a pair of flat portions formed on the outer periphery of the tip of the shaft member with an axis between them; and grooves perpendicular to the axis of the shaft member and formed on the surface of the flat portions, respectively; A non-circular fitting hole formed in the power transmission member to which the braking force of the rotating member is transmitted so as to be elastically deformable in the diametrical direction at the axial center portion and fitting with the flat portion, and an inner wall of the fitting hole. It is characterized in that it has a convex portion that protrudes from the inner wall and engages with the groove, and a hole that is provided at the back of the inner wall from which the convex portion is protruded to ensure elastic deformation of the inner wall.

[Effect]

In the damper with the above configuration, when a power transmission member such as a gear is fitted into the shaft member, the fitting hole and the convex portion formed in the power transmission member engage with the flat portion and groove formed in the shaft member, respectively. Thus, relative rotation and axial movement of the power transmission member with respect to the shaft member are restricted, and the power transmission member is reliably fixed to the shaft member.

In addition, when the flat part of the shaft member is press-fitted into the fitting hole, the inner wall is pushed by the flat part and elastically deforms and expands in diameter, but a hole is formed in the direction of deformation of the inner wall so as not to impede this deformation. has been done. Therefore, the inner wall is easily deformed and press-fitting becomes easy.

〔Example〕

1 to 3 show an embodiment of a damper according to the present invention.

In this embodiment, in the damper 10, one end of a rotor 14 which is a shaft member which constitutes a rotating member is attached to a base 12 which constitutes a part of a support member, and a cap 16 which constitutes another part of the support member. It is rotatably held around the

The rotor 14 has a shaft portion 14A as a base and a bottom wall 12B.
The shaft portion 14 is pivotally supported by the boss 12C of
A stepped portion 14B formed at the end of the shaft portion 14A abuts against the end surface of the cap 16 to prevent it from coming off. Furthermore, this stepped portion 14B
Continuing from this, a pair of flat plates 14C protrude to opposite sides of the axis of the rotor 14. This flat plate 14C
The bottom wall 1 of the accommodation hole 12A formed in the base 12
2B and the cap 16, gaps 18 are formed between the flat plate 14C and the base 12 and between the flat plate 14C and the cap 16, respectively. Grease, which is a viscous substance (not shown), is interposed in this gap 18 so that the rotation of the rotor 14 is braked with a predetermined torque.

This grease is prevented from leaking to the outside by seal rings 20 and 22 interposed between the rotor 14 and the cap 16 and between the cap 16 and the base 12, respectively.

The rotor 14 has a pair of flat portions 24 and 26 formed on the outer periphery of the tip of the shaft portion 14A, sandwiching the shaft center therebetween. Approximately U-shaped grooves 30 and 32, which constitute mutual engagement means, are formed in the axially intermediate portions of the flat portions 24 and 26 in a direction perpendicular to the axis of the rotor 14. has been done.

A gear 34, which is a power transmission member constituting a rotating member, is integrally attached to this shaft portion 14A.

The gear 34 is integrally molded from synthetic resin, and a gear attached to an opening/closing lid of an audio device (not shown) meshes with the gear portion on the outer periphery, so that opening/closing force is transmitted as rotational force. As shown in detail in FIG. 3, a fitting hole 36 corresponding to the shaft portion 14A of the rotor 14 is coaxially formed from one side of the gear 34 in the axial direction to a substantially central portion in the axial direction, and a fitting hole 36 corresponding to the shaft portion 14A of the rotor 14 is coaxially formed from one side in the axial direction of the gear 34, and a fitting hole 36 is formed coaxially from one side of the gear 34 in the axial direction to a substantially central portion in the axial direction. A relatively large diameter circular hole 38 communicating with the matching hole 36 is formed coaxially with the circular hole 3.
8, the fitting hole 36 can be fitted into the shaft portion 14A without interfering with the cap 16.

Approximately arch-shaped holes 40 and 42 are formed along the axial direction on both sides of the fitting hole 36 in the vicinity of the fitting hole 36, so that the gear 34 is hollowed out. Hole 4
0 and 42 are bottomed holes that extend to the vicinity of the bottom wall of the circular hole 38, so that between the fitting hole 36 and the hole 40 and between the fitting hole 36 and the hole 42, the hole 40, 4
2 are thin flexible parts 44 and 46 that can be elastically deformed in the direction of expanding and contracting the diameter. This thin flexible portion 44,
46 has convex portions 48 and 50 forming mutual engagement means on a surface forming the inner circumferential wall of the fitting hole 36, which is connected to the groove 3.
It is formed to protrude linearly into the fitting hole 36 in correspondence with numbers 0 and 32.

Next, the assembly of this damper 10 will be explained.
After fitting the shaft portion 14A of the rotor 14 into the boss 12C of the base, setting the seal rings 20 and 22 and sealing with the cap 16, the gear 34 is assembled to the tip of the shaft portion 14A protruding from the shaft support hole 16A. wear.

The shaft portion 14A of the rotor 14 is connected to the fitting hole 3 of the gear 34.
6, the flat portions 24, 26 temporarily expand the diameter of the thin flexible portions 44, 46 by elastic deformation, and are fitted into the fitting hole 36. In this fitted state, the convex portions 48, 50 are restored to their shape by the elasticity of the thin flexible portions 44, 46, and are reliably inserted into the grooves 30, 32 of the shaft portion 14A, respectively.

Therefore, when the gear 34 is installed, the convex portion 4
8 and 50 are abuttingly engaged with the inner walls of the grooves 30 and 32,
The gear 34 does not easily come off the shaft portion 14A.

After the rotor 14 and cap 16 are assembled into the housing hole 12A of the base 12 in this manner, the gear 34 is assembled. In this case, the gap 18 can be filled with grease by applying grease to the bottom wall 12B in advance. Therefore, when the opening/closing force of the opening/closing lid of an audio device (not shown) is transmitted to the gear 34 as a rotational force, the opening/closing speed of the opening/closing lid is moderated by the frictional resistance due to the grease in the gap 18, resulting in a gentle opening/closing operation.

This opening/closing force is reliably transmitted from the gear 34 to the rotor 14 by the engagement between the grooves 30, 32 and the convex portions 48, 50, and the two do not easily rotate relative to each other.

In the above, the rotor 14 and the cap 16 were sequentially assembled to the base 12, and then the gear 34 was assembled to the tip of the rotor 14 protruding from the cap 16, but the rotor 14, cap 16, and gear 34 were first assembled. These may be assembled to the base 12 after being assembled.

In addition, in the present invention, the gear 34 attached to the rotor 14 is not limited to a gear, but may be any other power transmission member such as a cam.

[Effect of idea]

As explained above, the damper according to the present invention includes a rotating member and a support member that supports the rotating member,
A damper having a viscous substance interposed in a gap between a rotating member and a supporting member, the damper comprising a shaft member protruding in the axial direction of the rotating member, and an axial line formed on the outer periphery of the tip of the shaft member. a pair of flat parts, a groove perpendicular to the axis of the shaft member and formed on the surface of the flat part, and a groove in the radially expanding direction in the axial center of the power transmission member to which the braking force of the rotating member is transmitted. a non-circular fitting hole that is formed to be elastically deformable and fits into the flat portion; a convex portion that protrudes from an inner wall of the fitting hole and engages with the groove; and the convex portion protrudes. and a hole provided at the back of the inner wall to ensure elastic deformation of the inner wall, which has an excellent effect of preventing the power transmission member from coming off with simple work without using any special equipment. has.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the damper according to the present invention, FIG. 1 is an exploded perspective view, FIG. 2 is a sectional view showing the assembled state of FIG. 1, and FIG. 3 is the same as the one shown in FIG. It is a sectional view showing a gear. 10... Damper, 12... Base, 14... Rotor, 14A... Shaft, 16... Cap, 18
... Gap, 34 ... Gear, 36 ... Fitting hole, 4
4, 46... Thin flexible portion, 48, 50... Convex portion.

Claims (1)

[Scope of utility model registration request] A damper comprising a rotating member and a support member that supports the rotating member, the damper having a viscous substance interposed in a gap between the rotating member and the supporting member, the damper comprising a shaft member protruding in the axial direction of the rotating member; , a pair of flat parts formed on the outer periphery of the tip of the shaft member with the axis line in between;
Grooves are formed on the surface of the flat portion perpendicularly to the axis of the shaft member, and grooves are formed on the shaft center of the power transmission member to which the braking force of the rotating member is transmitted so as to be elastically deformable in the diametrical direction. a non-circular fitting hole that fits into the flat portion; a convex portion that protrudes from the inner wall of the fitting hole and engages with the groove; and a convex portion that is provided on the back of the inner wall from which the convex portion protrudes. A damper characterized by having a hole that ensures elastic deformation of the inner wall.