JP4624507B2 - Damper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a damper.
[0002]
[Prior art]
A glove box or the like of a vehicle is provided with a damper 80 as shown in FIGS. 7 to 8 (see Utility Model Registration No. 2557064) in order to prevent an unpleasant impact sound that suddenly opens or opens and closes.
[0003]
The damper 80 includes a piston 84 that slides in the cylinder 82 while receiving air resistance, and a compression spring 86 that imparts spring resistance to the piston 84.
[0004]
A string 90 is connected to the hook 88 of the piston 84. The other end of the string 90 is guided by a guide surface 92A (curved) of a cap 92 attached to the end of the cylinder 82 and connected to a buffered member, thereby exhibiting a buffer function.
[0005]
In the structure of the damper 80, since the buffered member can be buffered via the string 90, the degree of freedom of mounting the damper is increased.
[0006]
However, since the cap 92 having the guide surface 92A for guiding the string 90 is necessary, the number of parts increases. Moreover, it is necessary to squeeze the string 90 with the metal ring 94 in a loop shape and stop it on the hook 88 of the piston 84, which increases the number of assembling steps. Further, as shown in FIG. 8, there is a problem that the compression spring 86 is buckled when it is compressed, rubs against the inner peripheral wall 82A of the cylinder 82, and abnormal noise is generated.
[0007]
[Problems to be solved by the invention]
In view of the above facts, the present invention aims to reduce the number of parts and the number of assembling steps, and to prevent the generation of abnormal noise when the piston moves.
[0008]
[Means for Solving the Problems]
In the first aspect of the present invention, a piston is provided in the cylinder that slides without leaking air. An opening is provided on one end of the cylinder, and a braking force transmission member connected to the piston enters and exits from the opening.
[0009]
Cap means is attached to the other end of the cylinder, and an orifice is formed between the cylinder and the cylinder. Further, a tension spring is disposed between the cap means and the piston.
[0010]
In the above configuration, when the braking force transmission member is pulled out from the cylinder and the piston moves toward the opening, the tension spring is pulled, so that the braking force acts on the braking force transmission member via the piston by the elastic restoring force. Since this tension spring exerts a braking force while extending, it buckles like a compression spring and does not contact the inner peripheral wall of the cylinder. For this reason, no abnormal noise is generated when the piston moves.
[0011]
Further, when the piston moves, the space between the piston and the cap means becomes negative pressure, and the outside air flows into the space through the orifice. At this time, the orifice gives a passage resistance to the air, so that the braking force is exerted through the piston. A braking force is applied to the transmission member.
[0012]
On the other hand, when the braking force transmitting member is returned into the cylinder, the piston is pulled by the tension spring, so that the piston is pulled back to the free spring position. As a result, the braking force transmission member is pulled back into the cylinder.
[0013]
Further, the piston is moved into the opening, when the outer cap when the air is sucked into the cylinder in close contact to the other end portion of the inner cap and the cylinder, the air is pulled back the piston with tension spring is exhausted, the outer The cap is separated from the inner cap and the other end of the cylinder . For this reason, when the string is pulled out and the air is inhaled, the outer cap is in close contact with the cylinder and fully performs the orifice function, and the string is returned and the air between the piston and the inner cap is pushed by the piston. Once, the outer cap away from the other end of the inner cap and the cylinder, to facilitate the circulation of air.
[0014]
In this way, since the one-way damper can be configured with a simple configuration without using a separate spring, the number of parts can be reduced.
[0015]
In the invention according to claim 2 , a guide surface for guiding the string is formed in the opening.
[0016]
In this way, by using the braking force transmission member as a linear material, the degree of freedom in mounting the damper is improved. Moreover, by providing a guide surface in the opening, the movement of the linear material becomes smooth, and there is no risk of damage.
[0017]
In the invention according to claim 3 , one end of the string is inserted into the molding die of the piston and fastened to the piston. For this reason, it is possible to reduce the number of steps for connecting the string to the hook of the piston as in the prior art.
[0018]
In the invention according to claim 4, a clip that can be attached to an attachment hole formed in the support portion is fixed to the other end of the strap . By simply picking this clip with a finger and mounting it in the mounting hole, the support portion and the string can be connected, so that the assembly work of the damper can be simplified.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show a damper 10 according to the present embodiment.
[0020]
The damper 10 includes a cylindrical cylinder 12, and a bracket 14 projects from the outer periphery of the cylinder 12. The bracket 14 is inclined with respect to the axis of the cylinder 12 and is fixed to a mounting block 18 provided on the back surface 16A of the glove box 16 as a braking target, so that the cylinder 14 is closed when the glove box 16 is closed. Twelve postures are raised.
[0021]
A cylindrical piston 22 is inserted from an opening 20 formed at one end of the cylinder 12. In order to reduce sliding resistance with the inner peripheral wall 12 </ b> A of the cylinder 12, an annular thinned portion 22 </ b> A is formed on the outer peripheral portion of the piston 22. An annular mounting groove 24 is formed on the outer periphery of the piston 22. An O-ring 26 is mounted in the mounting groove 24. The O-ring 26 slides in contact with the inner peripheral wall 12A of the cylinder 12, and the piston 22 reciprocates without leaking air in the cylinder 12.
[0022]
Further, one end portion of the strap 28 as a braking force transmitting member is integrally formed with the piston 22 in a state where the end portion is inserted into a molding die of the piston 22. For this reason, it is possible to reduce the number of steps for connecting the string to the hook of the piston as in the prior art.
[0023]
Further, a hook 30 is formed at the end of the piston 22. One end of a coiled tension spring 32 housed in the cylinder 12 is locked to the hook 30. The other end of the tension spring 32 is locked to a hook 36 of an inner cap 34 described later, and applies a braking force to the piston 22.
[0024]
On the other hand, on the inner peripheral wall in the vicinity of the opening of the cylinder 12, an engagement surface 38 that is cut down by one step is formed at a predetermined interval in the circumferential direction. An outer peripheral surface 34A of a cylindrical inner cap 34 that is press-fitted from the opening 20 is brought into surface contact with the engaging surface 38, and the cylinder 12 is closed.
[0025]
Further, the outer peripheral surface of the inner cap 34 is partially cut down to form an arc-shaped air passage 40 in a sectional view. The air passage 40 faces the inner peripheral wall 12 </ b> A of the cylinder 12 and allows air in the axial direction of the inner cap 34 to flow. Further, a hook 36 is formed on the back surface of the inner cap 34. The other end of the tension spring 32 is locked to the hook 36. Although the air passage 38 is not shown in FIG. 4, it is due to the difference in the position of cutting the cross section.
[0026]
On the other hand, a cylindrical outer cap 42 is attached to the outer edge portion 12 </ b> B of the opening 20 of the cylinder 12. A recessed portion 44 is formed in the center of the back surface of the top wall of the outer cap 42, and an air pocket is formed between the recessed portion 46 of the top wall of the inner cap 34.
[0027]
Further, the outer peripheral portion 48 of the recessed portion 44 is in contact with the peripheral end portion 20A of the opening 20 and the top wall 34B of the inner cap 34, and closes the air pocket. Further, an air groove 50 is formed in the radial direction on the outer peripheral portion 48 of the recessed portion 44 and crosses the peripheral end portion 20A.
[0028]
On the other hand, the outer diameter of the outer edge portion 12B of the cylinder 12 is smaller than the inner diameter of the outer cap 42, and an annular air passage 52 is formed around the outer edge portion 12B.
[0029]
A rectangular locking hole 54 is formed on the outer peripheral portion of the outer cap 42. The locking hole 54 is configured to be locked to a claw portion 56 protruding from the outer peripheral portion of the cylinder 12. Therefore, the outer cap 42 can be attached to the cylinder 12 with a single touch by simply press-fitting the outer cap 42 into the outer edge portion 12B. In addition, a gap is formed between the locking hole 54 and the guide surface 56A of the claw portion 56, and serves as a vent hole 58 through which air flows. Further, a backlash is provided between the locking hole 54 and the claw portion 56 so that the outer cap 42 can move slightly in the axial direction of the cylinder 12.
[0030]
On the other hand, the other end portion of the cylinder 12 is formed with a lid portion 60 that prevents the piston 22 from slipping out in such a manner that the inner peripheral wall is gradually narrowed. A through hole 62 is formed at the center of the lid 60, and the string 28 is drawn out of the cylinder 12. Further, the through hole 62 is formed with a guide surface 62A that spreads in a mortar shape toward the outside, so that the string 28 is not damaged even if the string 28 freely changes the pulling direction.
[0031]
Further, a clip 64 and a knob 66 are integrally fixed to the end portion of the strap 28. That is, the string 28 is inserted into the mold of the clip 64 and the knob 66, and the clip 64, the knob 66, and the string 28 are integrated. For this reason, the operation | work which connects the string 28, the clip 64, etc. is omissible.
[0032]
Next, the operation of the damper 10 according to this embodiment will be described.
[0033]
As shown in FIG. 3, the damper 10 is fixed to the back surface 16 </ b> A of the glove box 16. The glove box 16 can be opened in the direction of the arrow at the shaft portion 68, and a guide pin 74 protruding from the side wall 16 </ b> B is guided in a circular arc-shaped guide groove 72 formed in the instrument panel 70, so that it is loose. Open without any loss.
[0034]
The string 28 pulled out from the cylinder 12 of the damper 10 is connected to a dharma hole 76 formed in the body panel via a clip 64. If the knob 66 is grasped with a finger and the clip 64 is mounted in the dharma hole 76, the operation is facilitated. Further, since the knob 66 has a distance between the strap 28 and the body panel, the strap 28 is hardly damaged.
[0035]
Here, when the glove box 16 is opened, as shown in FIG. 6, the string 28 is pulled out from the cylinder 12 and the piston 22 moves to the lid 60 side. For this reason, the tension spring 32 extends, and a braking force is applied to the string 28 via the piston 22 by an elastic restoring force. Since the tension spring 32 exerts a braking force while extending, it does not come into contact with the inner peripheral wall of the cylinder 12 to generate noise.
[0036]
Further, when the piston 22 moves to the lid portion 60 side, the space 76 between the piston 22 and the inner cap 34 becomes negative pressure, and the outside air flows into the air passage 38 (see FIG. 2), the air groove 50, the air passage 52, And flow into the space 76 through an orifice constituted by the vent hole 58 (see FIG. 4). At this time, the orifice gives resistance to passage of air, whereby a braking force is applied to the string 28 through the piston 22. .
[0037]
For this reason, even if a heavy object is stored in the glove box 16, it does not open suddenly or make an unpleasant impact sound.
[0038]
On the other hand, when the glove box 16 is closed, as shown in FIG. 5, the piston 22 is pulled by the tension spring 32, so that the piston 22 is pulled back to the free position of the tension spring 32 and the string 28 is pulled back into the cylinder 12. It is.
[0039]
At this time, the piston 22 compresses the air in the space 76, but since the outer cap 42 is mounted with a backlash in the axial direction of the cylinder 12, the outer periphery 48 and the opening of the recess 44 shown in FIG. 4 are opened. A gap is formed between the peripheral end 20 </ b> A of the portion 20 and the top wall 34 </ b> B of the inner cap 34, and the compressed air in the space 76 is released to the outside through the air passage 38.
[0040]
Since the one-way damper can be configured with such a simple configuration, the number of parts can be reduced.
[0041]
In this embodiment, a string is used as the braking force transmission member, but a normal rod may be used. Further, the attachment location is not limited to the glove box, and any location where braking force is required can be applied.
[0042]
Further, in this embodiment, the cap means is constituted by the outer cap and the inner cap, but the inner cap may be omitted and the outer cap and the piston may be connected by a tension spring, or the end of the cylinder and the piston may be connected. You may connect with a tension spring.
[0043]
【The invention's effect】
Since the present invention has the above configuration, it is possible to reduce the number of parts of the damper and the number of assembly steps, and it is possible to prevent the generation of abnormal noise when the piston moves.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a damper according to the present embodiment.
FIG. 2 is an exploded perspective view of a damper according to the present embodiment.
FIG. 3 is a perspective view showing a mounting state of the damper according to the present embodiment.
FIG. 4 is an enlarged cross-sectional view showing an orifice portion of a damper according to the present embodiment.
FIG. 5 is a cross-sectional view showing the movement of the damper according to the present embodiment.
FIG. 6 is a cross-sectional view showing the movement of the damper according to the present embodiment.
FIG. 7 is a cross-sectional view showing the movement of a conventional damper.
FIG. 8 is a cross-sectional view showing the movement of a conventional damper.
[Explanation of symbols]
12 cylinder 22 piston 28 string (braking force transmission member)
32 Tension spring 34 Inner cap (cap means)
38 Air passage (orifice)
42 Outer cap (cap means)
50 Air groove (orifice)
52 Air passage (orifice)
54 Locking hole 56 Claw part 58 Vent hole (orifice)
60 Lid (opening)
62A Guide surface 64 clips

Claims (4)

A cylinder,
A piston that slides in the cylinder without leaking air;
A string connected to the piston and entering and exiting from an opening provided on one end side of the cylinder;
An air passage is formed on the outer peripheral surface and is attached to the opening at the other end of the cylinder to close the opening; and an inner cap is movably attached to the outer edge of the other end of the cylinder. a cap means having an outer cap, the forming the orifice between and the cylinder,
A tension spring that is attached to the inner cap and the piston, and is pulled when the piston moves to the opening to apply a braking force to the strap;
When the piston moves to the opening on the one end side of the cylinder and air is sucked into the cylinder, the outer cap is in close contact with the inner cap and the other end of the cylinder so that the orifice has resistance to passage of air. applied through the piston by the action of braking force to the string, when the piston is retracted by the tension spring, the outer cap you exhaust air separated from the other end of the inner cap and cylinder damper.   The damper according to claim 1, wherein a guide surface for guiding the string is formed in the opening.   The damper according to claim 2, wherein one end of the string is inserted into a molding die of the piston and fastened to the piston. The damper according to claim 2 or 3, wherein a clip that can be attached to an attachment hole formed in the support portion is fixed to the other end of the strap.

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