JP2586983B2 - Cylinder type oil damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder type oil damper, and more particularly to a cylinder type oil damper utilizing oil viscosity resistance.

[0002]

2. Description of the Related Art Conventionally, as a cylinder type damper,
Those using air or oil are known.

[0003]

However, with the conventional cylinder type air damper, it is difficult not only to manufacture a damper having a high damping force but also to obtain a stable damping force. was there. In contrast, conventional cylinder-type oil dampers can produce dampers with high damping force, but not only have troublesome oil filling and sealing measures, but also use a large amount of oil. However, there is a problem that the cost is increased. Therefore, the present invention is to solve the above problems, the purpose of which is to:
An object of the present invention is to provide a relatively inexpensive cylinder type oil damper using oil.

[0004]

Accordingly, an oil damper according to the present invention comprises a cylinder having one end open and the other end closed.
A rotatable inner cylinder fitted to the inner periphery of the cylinder, oil filled between the inner periphery of the cylinder and the outer periphery of the inner cylinder, slidably fitted in the inner cylinder; A shaft protruding outward from one open end of the shaft and being constrained to be non-rotatable with respect to the cylinder. The shaft protrudes concentrically from the shaft body and the other end of the shaft body. It consists of a shaft part and a stopper ring fixed to the other end of the shaft part.
And between the stopper ring and the shaft body
Slidably fitted in the inner cylinder.
The rotating body moves in the axial direction in response to pushing and pulling the shaft
Meshing and non-meshing teeth
The stopper ring and the rotating body are provided so as to face each other, and a spiral groove is provided on an inner periphery of the inner cylinder, and a projection is provided on an outer periphery of the rotating body to engage with the spiral groove.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a cylinder type oil damper. The oil damper 1 includes a cylinder 2, an inner cylinder 3 rotatably fitted to the inner circumference of the cylinder, and an inner cylinder 3 of the cylinder 2 and the inner cylinder 3. An oil 4 filled between the cylinder 2 and the inner cylinder 3, and a shaft 5 which protrudes from the inner cylinder 3 to the outside of the cylinder 2 and does not rotate with respect to the cylinder 2 but performs only linear reciprocating motion. The shaft 4 and the shaft 5 are formed of plastic, respectively, and the oil 4 is made of, for example, silicone oil having high viscous resistance.

The cylinder 2 has a cylindrical shape with one end open and the other end closed, and its open end is closed by a cap 6 through which the shaft 5 is inserted. The cap 6 is
Similar to the cylinder 2, it is a plastic molded product, has a circular shape having an outer circumference substantially equal to the inner circumference of the cylinder 2, and has a cross groove 7 penetrating at the center thereof before and after the shaft 5 is inserted.

[0007] The cylinder 2 and the cap 6 have projections and depressions to be fitted to each other. In this case, a pair of projections 8, 8 projecting in a sawtooth cross section are provided on the outer periphery of the cap 6 to face each other. At the same time, a pair of concave portions 9, 9 into which the convex portion 8 is fitted is formed at the open end of the cylinder 2 on the opposite side. In order to apply elastic force to the convex portions 8, the cap 6 has arc-shaped voids 10 opened in the front and rear surfaces inside each of the convex portions 8, and the convex portions 8 face the voids 10. It can be bent.

Further, from the outer periphery of the cap 6, a pair of keys 11, 11 are protruded from the outer periphery of the cap 2 so as to be out of phase with each other by 90 degrees, and the open end of the cylinder 2 is A pair of key grooves 12, 12 into which the key 11 is inserted are cut out from the end faces. The key may be formed on the inner periphery of the cylinder 2 and the key groove may be formed on the outer periphery of the cap 6.

The inner cylinder 3 has an outer diameter slightly smaller than the inner circumference of the cylinder 2 and has a cylindrical shape with one end open and the other end closed, similarly to the cylinder 2, and a closed end. Protruding shaft 1
3 is formed, and a receiving groove 14 into which the protruding shaft 13 is rotatably fitted is formed on the inner surface of the opposing cylinder head to prevent the inner cylinder 3 from swinging during rotation. Also, inner cylinder 3
At the closed end, an annular protrusion 15 slightly larger than the protruded shaft 13 is formed concentrically with the protruded shaft 13, and a space 16 in which the oil 4 accumulates between the closed end of the inner cylinder 3 and the inner surface of the cylinder head. It can be so.

On the other hand, between the inner circumference of the inner cylinder 3 and the outer surface of the shaft 5, there is provided a conversion means for converting the linear reciprocating motion of the shaft 5 into the rotational motion of the inner cylinder 3. This conversion means includes an inner cylinder 3
And spiral projections 18a and 18b projecting from the outer surface of the shaft 5 that traces the spiral grooves 17a and 17b. The above spiral groove 1
7a, 17b are formed in parallel on the inner periphery of the inner cylinder 3 so as not to cross each other. The spiral grooves 17a, 17
In order to form b, the inner cylinder 3 is divided into two parts, and one half of the spiral groove is formed on one side thereof, and then joined.

The shaft 5 has a cross-shaped shaft body 19 which is non-rotatably inserted into the cross groove 7 of the cap 6.
And a cylindrical shaft portion 19a extending in the axial direction from the distal end portion of the shaft body 19; and a pair of recesses 22, 22 extending further in the axial direction from the shaft portion 19a and confined from both sides in the middle of the length.
Consisting of a tip locking portion 19b having a substantially T-shaped cross section having
The aforementioned projections 18a and 18b are provided on the outer periphery of a rotating body 20 rotatably supported by the shaft portion 19a and movably in the axial direction.

[0012] Between the shaft 5 and the rotating body 20, rotation of the rotating body 20 is prevented by linear movement in one direction of the shaft, and rotation of the rotating body 20 is allowed by linear movement in the other direction. A clutch mechanism is provided. The clutch mechanism includes the rotating body 20 and a stopper ring 21 cooperating with the rotating body 20. The stopper ring 21 is fixed to the tip of the shaft so as not to rotate, and
One of the serrated teeth 20 'and 21' meshing with each other is formed in an annular shape between the zero and the stopper ring 21.

The rotating body 20 includes a shaft portion 1 of the shaft.
It has a cylindrical shape with an inside diameter approximately equal to the outside diameter of 9b.
The stopper ring 21 has a cylindrical shape having the same diameter as the rotating body 20, and has a front end locking portion 1 at the front end.
A pair of claws 23, 23 projecting obliquely forward and obliquely forward to be fitted into the recesses 22 of 9b are provided.

First, the procedure of assembling the shaft 5 will be described. After the rotating body 20 is fitted to the shaft portion 19a of the shaft,
Next, the stopper ring 21 is connected to the front end locking portion 19b of the shaft.
When together fitted on, the pawl 23 is pushed open by the head of the tip engaging portion 19b, and reaches the recess 22 of the front end engaging portion 19b, fitted into the recess 22 the pawl 23 is closed and snapped, The stopper ring 21 does not come off from the distal end locking portion 19b , and the stopper ring is locked so as not to rotate.

The rotating body 20 is also prevented from coming off via the stopper ring 21 and is movable in the axial direction on the shaft portion 19a of the shaft.
The rotation of the rotating body 20 is prevented because the stopper ring 21 is non-rotatably locked to the distal end locking portion 19b so as to mesh with the first tooth 21 '. On the other hand, the retreating position is restricted by the rear end of the rotating body 20 coming into contact with the tip of the shaft main body. At this time, the teeth 20 ′ and 21 ′ are disengaged from each other, and the rotating body 20 It becomes rotatable around the shaft 19a.

On the other hand, an appropriate amount of oil 4 is injected from the opening surface of the cylinder 2 with the head of the cylinder 2 facing downward. Next, when the closed end of the inner cylinder 3 is inserted downward so as to match the opening surface of the cylinder 2, the oil 4 is removed from the small gap 24 generated between the inner circumference of the cylinder 2 and the outer circumference of the inner cylinder 3. To be charged. After that, the open end of the gap 24 is closed by the O-ring 25 to prevent oil leakage. In the present embodiment, an annular groove 26 for fitting the O-ring 25 is formed at the open end of the inner cylinder 3, and the O-ring 25 is fitted into the fitting groove 26.

Next, the previously assembled shaft 5 is inserted from the open surface of the inner cylinder 3 and the two projections 1
8a and 18b are connected to the two spiral grooves 17a and 1 on the inner circumference of the inner cylinder 3.
7b, the shaft 5 is inserted to some extent, and the cap 6
Align the cross groove 7 and pass it later. Finally, cap 6
The key 11 can be aligned with the key groove 12 at the open end of the cylinder 2 and then pushed strongly. When the cap 6 is pushed in in this manner, the convex portion 8 is pushed by the inner periphery of the cylinder 2 and elastically bends toward the arc-shaped space 10, and the cylinder 2
When it reaches the concave portion 9, it snaps into the concave portion 9 due to its elastic restoring force and does not come off. When the cap 6 is attached, the front surface of the cap 6 slightly crushes the O-ring 25 so that the O-ring 25 is in close contact with the gap 24.

The operation of the oil damper 1 assembled according to the above-described procedure will be described. When the shaft pushed into the inner cylinder 3 is pulled out of the cap 6, as shown in FIG. The shaft portion 19 a is relatively advanced in the axial direction, and the teeth 20 ′ of the rotating body 20
Meshes with one tooth 21 '. Thus, the teeth 20 of the rotating body 20
′ And the teeth 21 ′ of the stopper ring 21 mesh with each other,
The stopper ring 21 is non-rotatably locked to the front end locking portion 19b of the shaft, and the shaft main body 19 is also inserted into the cross groove 7 of the cap 6 so as to be fixed to the cap 6 and thus to the cylinder 2. Since it cannot rotate, the rotating body 20 cannot rotate with respect to the cylinder 2.

Therefore, when the shaft is pulled out, the rotating body 2
0 does not rotate but performs only a linear motion integrally with the shaft. At this time, since the projections 18a and 18b of the rotating body 20 are fitted into the spiral grooves 17a and 17b of the inner cylinder of the inner cylinder 3, the projections 18a and 18b trace the spiral grooves 17a and 17b,
The inner cylinder 3 rotates with respect to the cylinder 2.

When the inner cylinder 3 rotates in this manner, the rotation of the inner cylinder 3 is braked by viscous resistance of the oil 4 filled between the outer circumference of the inner cylinder 3 and the inner circumference of the cylinder 2, and the braking force causes the shaft 3 to rotate. The braking force acts on the force that tries to pull out.

On the contrary, when the shaft is pushed in, the rotating body 20 relatively retreats in the axial direction of the shaft portion 19b of the shaft as shown in FIG. Is removed, and the rotating body 20 becomes rotatable about the shaft portion 19a of the shaft. For this reason, when pushing in the shaft, the projections 18a, 18b of the rotating body 20
By tracing 17b, since the rotation resistance of the inner cylinder 3 is larger, the rotating body 20 rotates around the shaft portion 19a of the shaft. Therefore, no braking force acts in the direction in which the shaft is pushed in, and the shaft can be pushed in quickly and relatively lightly.

FIG. 4 shows an example of the use of the oil damper 1 having the above-described structure. The glove box 27 of the automobile uses the braking force of the oil damper 1 in one direction to generate a pattern and momentum due to its own weight. Prevent it from opening well.
In the figure, reference numeral 28 denotes an instrument panel in the vehicle interior,
The panel 28 includes a hollow housing 32 having at least an open lower surface, which includes an upper wall 29 surrounding the glove box 27, left and right side walls 30, 30 and a back wall 31. The glove box 27 is pivotally mounted between the side walls 30 so that the glove box 27 is pivotally opened obliquely downward from the open lower surface of the housing 32 by its own weight with its pivot 27 'as a fulcrum.

The oil damper 1 has the head end 2 'of the cylinder 2 pivotally supported on the outer surface of the side wall 30 of the housing 32, and the rear end 19' of the shaft body 19 penetrates the side wall 30 of the housing 32. To the side of the glove box 27. In the drawing, reference numeral 33 denotes a pivot 27 '.
The guide hole 33 is bent in an arc around the center, and penetrates through the inner and outer surfaces of the side wall 30 of the housing 32.
Through the moving shaft 34 and the rear end 19 of the shaft body 19.
′ Is pivotally supported on the side surface of the glove box 27. Therefore, by opening and closing the glove box 27, the moving shaft 34 moves along the guide hole 33, and when the glove box 27 is opened downward, it contacts the lower end of the guide hole 33 and the glove box 27 is further opened. regulate.

On the other hand, the glove box 27 is normally closed with its open upper surface in close contact with the lower surface of the upper wall 29 of the housing 32 (a chain line in FIG. 4), and is locked at this closed position by a locking mechanism (not shown). You. When the locking device is released in this closed position, the glove box 27 falls down by its own weight and opens, but at this time, the shaft of the oil damper 1 is pulled out, and the glove box 27 is moved by viscous resistance of the oil 4 in the damper 1. It is braked and opens slowly and quietly (solid line in Fig. 4).

On the other hand, the open glove box 2
When pulling up from below, the shaft is pushed in reverse, so that the braking force does not work and the glove box 27 is closed.
Can be closed quickly and relatively lightly (dotted line in FIG. 4). When the glove box 27 is closed to the upper side, the glove box 27 is locked to the closed position again by the locking device.

On the other hand, in the embodiment shown in the drawings, the braking force is applied only when the shaft of the oil damper 1 is pulled out, but the braking force may be applied only when the shaft is pushed in. That is, in this embodiment, the rotating body 20
It is only necessary to reverse the positional relationship between and the stopper ring 21. Further, as a field of application of the oil damper 1,
As shown in the figure, the present invention is not limited to the case where the present invention is applied to a glove box of an automobile, and can be used in fields such as home appliances and furniture. or,
The oil damper 1 can change the viscosity of the oil 4 to be injected or change the spiral groove 17 of the inner cylinder 3 even if the size of each part is the same.
The braking force can be freely changed only by changing the helix angle of a and 17b, so that it can be used in a wide range of fields.

[0027]

Since the present invention is constructed as described above, it is possible to obtain not only a stable damping force but also a large damping force as compared with the conventional air damper. Compared with the oil damper, it is easy to fill and seal the oil, and the amount of oil used is small, so that a relatively inexpensive and high-performance cylinder-type oil damper can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state where a shaft is pushed into a cylinder.

FIG. 2 is an exploded perspective view.

FIG. 3 is a sectional view showing a state where a shaft is pulled out of a cylinder.

FIG. 4 is a partial cutaway view of an instrument panel of an automobile showing an example of use of an oil damper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder type oil damper 2 Cylinder 3 Inner cylinder 4 Oil 5 Shaft 17a Helical groove 17b Helical groove 18a Projection 18b Projection 19 Shaft main body 19b Shaft part 20 Rotating body 20 'Teeth 21 Stopper ring 21' Teeth

Claims (1)

(57) [Claims] 1. A cylinder having one end opened and the other end closed, a rotatable inner cylinder fitted on the inner periphery of the cylinder,
Oil filled between the inner circumference of the cylinder and the outer circumference of the inner cylinder, slidably fits into the inner cylinder, and one end protrudes outward from one open end of the cylinder. A shaft constrained to be unrotatable,
The shaft comprises a shaft main body, a shaft protruding concentrically from the other end of the shaft main body, and a stopper ring fixed to the other end of the shaft.
Rollable and between the stopper ring and the shaft body
Attached movably in the axial direction, slidably fits in the inner cylinder
The rotating body moves in the axial direction according to the combined push and pull of the shaft.
Intermeshing teeth that engage and disengage as they move
A cylinder provided with a spiral groove on the inner circumference of the inner cylinder, and a projection engaging with the spiral groove on the outer circumference of the rotary body. Type oil damper.