JPH0533659Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a shock absorbing device for a lid opening/closing mechanism that is used, for example, in a console box of an automobile and absorbs the shock when the lid is opened and closed.

[Prior art] As a shock absorber for this type of lid opening/closing mechanism,
Conventionally, Fig. 7 (see Utility Model Application Publication No. 138862/1986)
The one shown is used.

A lid 3 is attached to the console box body 1 via a rotation shaft 2 so as to be openable and closable.
This lid 3 includes a small diameter first gear 4 and a large diameter second gear.
Two fan-shaped gears, including gear 5, are fixed coaxially with rotating shaft 2.

Further, on the main body 1 side, a circular third gear 6 and a fourth gear 7 that mesh with the first and second gears 4 and 5 are fixed to a buffer shaft 8a of a hydraulic damper 8.

The third and fourth gears 6 and 7 are provided with teeth over the entire circumference. The first gear 4 is provided with teeth that mesh with the third gear 6 throughout the lid opening/closing range, whereas the second gear 5 is provided with teeth that engage the third gear 6 only when the lid 3 is fully open and closed. Teeth are provided except for a part so as to mesh with 7.

With this configuration, only the first and third gears 4 and 6 are engaged in the middle part of the opening/closing range of the lid 3, so a small torque acts on the rotating shaft 2, and when the lid 3 is near and completely open, a small torque is applied to the rotating shaft 2. When the lid 3 is closed, the two sets of gears 4, 6, 5, and 7 are in mesh with each other, and due to the difference in the gear ratios of these sets, a large torque is applied to the rotating shaft 2 of the lid 3, which buffers the impact when opening and closing.

[Problem to be solved by the invention] However, in the conventional shock absorber of the lid opening/closing mechanism described above, the two sets of gears mesh near the fully open position and near the fully closed position, regardless of whether the lid is opened or closed. Since the lid was configured to generate torque, a large amount of force had to be applied when opening the lid, making it difficult to operate.

This idea was devised in view of the above-mentioned conventional problems, and at least when starting to open the lid, one set of gears is disengaged, thereby making it possible to open the lid with a small amount of force. The purpose is to provide equipment.

[Means for Solving the Problems] In order to achieve the above object, this invention integrates the first and second gears, which have different diameters, on a lid attached to the main body via the rotation shaft, coaxially with the rotation shaft. The third and fourth gears, which are rotatably fixed and mesh with both gears, are coaxially fixed to a buffer shaft with rotational resistance fixed to the main body, and the first and third gears are mutually fixed over the entire opening/closing range of the lid. In a shock absorbing device for a lid opening/closing mechanism, the second and fourth gears are provided with teeth so as to mesh with each other, and the second and fourth gears are provided with teeth except for a portion so as not to mesh with each other in the middle of the opening/closing range of the lid, wherein the second gear is displaced in the axial direction. A cam groove is provided along the circumferential direction on the surface of the second gear in the urging direction, and a bottom surface of the cam groove is provided on the main body. A pin is provided to limit the displacement of the second gear by contacting the cam groove, and a slope and a step are provided at the bottom of the cam groove so that the second and fourth gears do not engage at least near the fully closed position during the opening operation of the lid. It is characterized by:

[Example] This invention will be explained below based on the drawings. 1 to 6 show an embodiment of this invention.

A rotating shaft 10 to which a conventional lid (not shown) is fixed is rotatably provided with respect to the main body 20. The first gear 11 has a small diameter and the second gear has a large diameter.
Two fan-shaped gears, including a gear 12, are coaxially fixed to the rotating shaft 10 so as to be rotatable together.

The first gear 11 is directly fixed to the rotating shaft 10, whereas the second gear 12 is attached to the main body 20 side of the first gear 11. 2nd gear 12
The engaging piece 11a formed to protrude in the radial direction from the vicinity of the rotating shaft 10 of the first gear 11 is connected to the second gear 1.
A rod-shaped protrusion 11b that is engaged with the notch 12a of No. 2 and provided on the main body 20 side of the first gear 11.
is attached to the hole 12b of the second gear 12 so as to be slidable in the axial direction of the rod-like projection 11b.

The main body 20 includes a buffer shaft 21a having rotational resistance.
A hydraulic damper 21 is fixed with a screw 21b. The buffer shaft 21a has a first and a second
a circular third mesh that meshes with the gears 11 and 12, respectively;
Fourth gears 22 and 23 are coaxially fixed.

The third and fourth gears 22 and 23 are provided with teeth over the entire circumference, and the first gear 11 has teeth on the entire circumference so as to mesh with the third gear 22 over the entire opening/closing range of the lid. The second gear 12 is provided with teeth, and the fourth gear 2
To avoid meshing with 3, teeth are provided only at both ends except for the middle part of the circumferential part. The third gear 22 is formed to have a large diameter, and the fourth gear 23 is formed to have a small diameter.

The second gear 1 is movable in the direction of the rotation axis 10.
2 has a recess 12c formed in the side surface on the first gear 11 side, and the recess 12c has a direction in which the second gear 12 is disengaged from the fourth gear 23, that is, in the direction toward the main body 20. A coil spring 13 is elastically loaded.

Further, a cam groove 12d is provided on the surface of the second gear 12 on the main body 20 side along the circumferential direction.
On the other hand, the main body 20 has a cam groove 12d of the second gear 12.
A pin 24 is provided to protrude and engage with.
This pin 24 is provided so as to be slidable along the radial direction of the second gear 12 while being biased towards the rotating shaft 10 side.

The cam groove 12d has second and fourth gears 12, 23.
The slopes and steps described below are provided so that the lids do not engage at least near the fully closed state during the opening operation of the lid.

That is, the bottom surface A of the cam groove 12d is close to the pin 2 when the lid is completely closed, as shown in an enlarged view in FIG.
The lid is formed so as to be gradually shallower as a whole from one end side Aa that engages with the pin 24 toward the middle part Ab that engages with the pin 24 near the middle of the lid opening/closing area. Pin 2 when fully open
There is a shallow groove up to the other end Ac that engages with 4. Moreover, on the rotating shaft 10 side of one end side Aa of the cam groove 12d, a shelf part B having the same depth as the other end part Ac is gradually stretched toward the outer circumferential side of the second gear 12 toward the intermediate part Ab. It is formed in such a way that it comes out.

The cross-sectional shape of the cam groove 12d at each cutting position in FIG. 3 is as shown in FIGS. 4 to 6. In other words, the part marked by the - line is a simple U-shaped groove formed only by the bottom surface A, and -
The part indicated by the line has a step-like shape from the bottom surface A, which is shallower than the part indicated by the - line, and the shelf part B. Bottom A is one end side
It gradually becomes shallower from Aa to the other end side Ac, −
The line portion has the same depth as the end B and has a shallow U-shape.

Next, the operation of the shock absorbing device of the lid opening/closing mechanism having the above structure will be explained.

When the lid is completely closed, the pin 24 is engaged with one end side Aa of the cam groove 12d, and the second gear 12 is positioned closer to the main body 20 side by the biasing force of the coil spring 13, and the fourth gear 23 The engagement with has been released. Therefore, when opening the lid, the first and third
Since only a small torque is applied due to the meshing of the gears 11 and 22, the lid can be released with a small force.

When the lid is gradually released, the rotation axis 10
At the same time, the first and second gears 11 and 12 rotate, and the third gear 22 rotates accordingly. Pin 24 is
Since it is biased toward the rotating shaft 10 side, the cam groove 12
d to the rotation axis 10 side, but the bottom part A
Since the outer circumference side wall surface is stepped, it slides along this wall surface while being pushed toward the outer circumference side. At this time, due to the inclination of the bottom surface A of the cam groove 12d, the second
Gear 12 is gradually displaced toward first gear 11.

However, since the second gear 12 does not have teeth in the intermediate portion Ab, only the first and third gears 11 and 22 are in mesh with each other in the intermediate portion of the lid opening/closing region, as at the beginning of opening.

After the pin 24 passes the middle part of the cam groove 12d, there is no difference in level between the pin 24 and the shelf B, so that the pin 24 slides along the wall surface on the rotation shaft 10 side.

When the lid is fully opened, the second gear 12 and the fourth gear 23, which have been displaced toward the first gear 11, mesh with each other, and due to the difference in gear ratio between the first and third gears, the rotation shaft 10 Generates large torque and cushions the shock when fully opened.

When closing the lid, two sets of gears 11, 2
Since 2, 12, and 23 are in mesh with each other, a large force is applied to start closing. In the middle part of the lid opening/closing area, the second gear 12 is
The meshing of the fourth gears 12 and 23 is released, and the rotation shaft 1
The torque applied to 0 becomes smaller.

The pin 24 slides along the wall surface of the cam groove 12d on the rotating shaft 10 side, and on the shelf B after passing the intermediate portion Ab. Therefore, the second gear 12 rotates while being pushed toward the first gear 11, and meshes with the fourth gear 23 again near the fully closed position. This generates a large torque on the rotating shaft 10, which buffers the impact upon closing.

When the lid is fully closed, the pin 24 is moved to the shelf B.
It falls to the deep part Aa of the bottom A, and the second gear 12
slides toward the main body and is disengaged from the fourth gear 23.

In the above-mentioned embodiment, a large torque is generated even when starting to close a fully opened lid. This configuration functions as a lock to keep the lid open, but the cam groove 12d
If a symmetrical shelf is formed on the other end side, the torque at the beginning of closing can be reduced.

[Effects of the invention] As explained above, according to the shock absorbing device for the lid opening/closing mechanism according to this invention, the meshing of the second and fourth gears is released at the beginning of opening or closing, and the lid is suspended on the lid rotation shaft. Since the torque can be reduced, the operability of opening and closing the lid can be improved.

[Brief explanation of the drawing]

1 to 6 show an embodiment of a shock absorbing device for a lid opening/closing mechanism according to this invention. is an explanatory diagram showing the gear arrangement, Figure 3 is a perspective view of the cam groove, and Figures 4 to 6 are - of Figure 3.
It is a line, - line, - line sectional view. FIG. 7 is an explanatory diagram showing a conventional shock absorbing device for a lid opening/closing mechanism. 10... Rotation axis, 11... First gear, 12...
2nd gear, 12a...cam groove, 20...main body, 2
1a...Buffer shaft, 22...Third gear, 23...Fourth gear, 24...Pin.

Claims (1)

[Claims for Utility Model Registration] First and second gears having different diameters are fixed to a lid attached to the main body via a rotation shaft so as to be integrally rotatable coaxially with the rotation shaft, and are engaged with both gears. third and fourth gears are coaxially fixed to a buffer shaft having rotational resistance fixed to the main body, the first and third gears are provided with teeth so as to mesh with each other over the entire opening/closing range of the lid; In a shock absorbing device for a lid opening/closing mechanism, the second and fourth gears are provided with teeth except for a portion so as not to mesh in the middle of the opening/closing range of the lid, and the second gear is displaceable in the axial direction; A cam groove is provided along the circumferential direction on the surface of the second gear in the urging direction, and the main body is in contact with the bottom surface of the cam groove to A pin is provided on the bottom surface of the cam groove to limit the axial displacement of the second gear, and
A shock absorbing device for a lid opening/closing mechanism, characterized in that the fourth gear is provided with an inclination and a step so that the fourth gear does not engage at least near the fully closed area during the opening operation of the lid.