JP2810176B2 - Stay damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is most suitable as a stay damper for assisting the opening and closing of a rear gate in a hatchback or van type vehicle. Open stay damper.

2. Description of the Related Art Generally, a stay damper is used in an opening / closing mechanism of a rear gate of a hatchback vehicle or the like to reduce an operating force when the door is opened and closed, and to regulate and hold a fully opened position of the door.

By the way, as the door opening / closing mechanism, it is preferable that the front end of the door is flipped up to a position as high as possible in a fully opened state so as to be convenient for taking in / out luggage. The tip cannot be reached,
Inconveniences such as difficulty in closing the door by pulling down may also occur.

Therefore, in the conventional means of this kind, a main body cover cylinder integral with the telescopic rod of the stay damper is provided, and an engagement bolt is screwed in from an appropriate position of the cover cylinder to abut the flange edge of the main body end with the bolt. Prevents the rod from stretching,
An intermediate stopper method for regulating the door opening at this position, and further, a cam groove formed in a stepped manner is formed in the cover cylinder, and a locking pin protruding from the main body side is fitted into this.
By rotating the cover cylinder at the time of use, the position of the step groove with respect to the pin is changed, and a multi-stage stopper system or the like that regulates the extension length of the rod by the step abutment of the pin in the step groove at that time is adopted. Thus, the door can be opened in a two-stage manner, that is, holding the door halfway open and fully opening the door.

[Problems to be solved by the invention]

By the way, such a two-stage opening structure of the stay damper requires manual work and adjustment such as a work of screwing an engagement bolt in a cover cylinder or a rotating operation of the cover cylinder itself when an intermediate stopper function is required. In addition, there is a drawback that the stay damper itself becomes bulky due to the presence of the cover cylinder.

Therefore, the present invention provides a stay damper having a two-stage opening function that eliminates such preliminary adjustment work by an individual user or manual work to be performed each time of use, and is particularly a small damper that does not require a cover tube or the like. The purpose is to develop bulky equipment.

[Means for solving the problem]

Thus, according to the present invention, according to the present invention, while a ratchet provided with a cam projection directed to a piston rod is rotatably mounted on a cylinder inner wall outside a piston stroke area, the expansion and contraction operation is performed on a piston spigot portion of the piston rod. This is achieved by a stay damper in which a cam groove for guiding the cam projection of the ratchet and a stopper for determining a locking position in the middle of the movement of the cam projection are arranged in a circumferential direction in a predetermined phase relationship.

(Operation)

The relative position of the cam projection on the cylinder side and the cam groove and the stopper portion on the piston rod side are always regulated in the range of expansion and contraction of the piston rod by the cam action between them. Since the ratchet provided with the cam projection is rotatable with respect to the cylinder, the cam projection guided by the cam groove or the like can move in the circumferential direction, and as a result, the operating direction of the rod Can be changed in the phase of the advance of the projections.

Therefore, depending on the selection of the advancing / retracting operation of the cam projection, that is, the expansion / contraction operation of the piston rod, the projection is caused to enter the locking position of the stopper portion, or is withdrawn from the locking position, passes through another phase path, and passes through the stopper portion. Can be further advanced and moved around.

〔Example〕

 Next, an illustrated embodiment of the present invention will be described.

FIG. 1 is a longitudinal sectional view showing a main part of one embodiment of the present invention.
A piston rod 3 holding at its tip a piston 2 slidably fitted to a cylinder 1 is removably assembled into the cylinder 1 filled with a working fluid such as gas or oil by a bearing mechanism 4.

The cylinder 1 is sandwiched between a pair of locking rings 5a and 5b fixed at a predetermined distance from the end of the stroke area of the piston 2 by caulking or the like.
Is rotatably mounted.

On the other hand, in the piston spigot part of the piston rod 3,
The ratchet collars 7a and 7b are sequentially fitted in a state where a predetermined relational position is secured in the axial direction by means such as engagement fitting of an abutting end face or cutting by diagonal cutting in addition to alignment joining with an adhesive. Are assembled together with the piston 2 and the valve stopper 10 by tightening a piston nut 11.

And these are ratchet 6 and ratchet collar 7
The cam protrusion 8 and the cam grooves 9a and 9b are provided at positions a and 7b where the cam protrusions 8 and the cam grooves 9a and 9b are slidably fitted to each other.

FIG. 2 is an exploded view of the portion showing the relationship between the cam projection 8 and the cam grooves 9a and 9b. The cam projection 8 on the ratchet 6 side is formed of a triangular body having three sides of sliding cam surfaces. ,
The ratchet 6 can be rotated in the vertical direction in FIG. 2 by turning.

On the other hand, when the cam projection 8 is located at the piston rod compression position a1 or a2, the cam groove 9a of the cam grooves 9a and 9b on the ratchet collars 7a and 7b side can come into contact with one side or one corner thereof. The protrusion 8 passes between a plurality of rhombic cams 91 arranged in parallel with the ratchet collar 7a (path b1 or path b1).
It is formed as a gap that allows b2). Then, at the position where the projection 8 (a3 position) is further introduced (path b3) along the rhombic cam 91 in the extending direction, the tip of the projection 8 comes into contact with the arrow-shaped cam 92 arranged in parallel with the ratchet collar 7b. In addition, a cam groove 9b is formed along the slope of the cam 92 so as to be introduced (position a4) into the middle stopper 93 at a deep portion thereof.

Further, a return area l is formed in the cam groove 9b to allow the cam projection 8 to move in the reverse direction (path b4), and the projection 8 pivots along the oblique side of the rhombus cam 91 in the return area l. During the introduction, the phase of the projection 8 is switched with respect to the axial movement direction (a5 position), and the path b5 through which the cam projection 8 is again introduced in the axial direction forms the stopper portion 93. Movement of the projection 8 along the outside of 92 (a6 position)
The rear surface of the cam 92, which is restricted by this and can penetrate, is formed as a final step 94 composed of an inclined surface having the shape of a tip of an arrow blade.

In addition, the cam projection 8 which reversely moves from the middle stopper 93 and the projection 8 which moves in the compression direction from the most extended position.
However, each cam position is determined so as to be able to return to the most compressed position through the gap (path 6b) in which the arrow blade-shaped cam 92 and the diamond-shaped cam 91 are juxtaposed, and the cam grooves 9a and 9b are determined. It is formed.

Therefore, according to such an embodiment, when the piston rod 3 first starts operating in the extending direction from the state where the piston rod 3 is in the most compressed position, the cam protrusion 8 is opposed to the movement of the cam grooves 9a and 9b connected thereto. However, along the cam surface of the diamond-shaped cam 91 abutted from the a1 or a2 position, the cam projection 8 itself pivots by the rotation of the ratchet 6, passes through the gap between the diamond-shaped cams 91, passes through the a3 position, and stops at the middle stopper. It is guided to engage with the portion 93 (position a4).

That is, the movement from the most compressed state of the piston rod 3 to the engagement position between the middle stopper 93 and the cam projection 8 is defined as a front stroke region, and the engagement position is an intermediate locking position.

Next, when the piston rod 3 is reversely moved (return area 1) in a direction opposite to the operation direction up to that point, the cam projections 8 are moved to the engagement positions (a4 From the position), hits the slope of the diamond-shaped cam 91, and moves further (a5 position) while turning along the same. As a result, the projection 8 deviates from the phase of entry into the middle stopper 93 in the introduction movement in the axial direction up to that time.

Then, when the piston rod 3 is moved to the side again,
The cam projection 8 reaches the position a6 from the position a5, and is further guided along the outside of the arrow blade-shaped cam 92. Then, the valve stopper 10 of the extended piston rod 3 abuts against the edge of the locking ring 5b, and the rod 3 is prevented from further extending.

That is, the distance from the position where the cam projection 8 is locked by the middle stopper 93 to the position where the valve stopper 10 is locked by the abutment with the locking ring 5b is the second stroke, and the piston rod 3 is fully extended. Position.

FIG. 3 shows a means for alleviating the impact at the time of push-off, such as when the cam projection 8 abuts against the middle stopper 93 and the valve stopper 10 abuts against the edge of the locking ring 5b. As shown, it is effective to arrange buffer rings 12 and 13 made of rubber material or the like between the ratchet 6 and the locking ring 5a and at the edge of the locking ring 5b, respectively.

The return of the piston rod 3 from the extended position to the most compressed position can be performed by moving the rod 3 in the compression side when the cam projection 8 is at the middle stopper 93 or the most extended position. The groove 9 is smoothly moved without any catching on the way.

By forming the ratchet collar 7a having the diamond-shaped cam 91 and the ratchet collar 7b having the arrow blade-shaped cam 92 separately, these can be relatively easily formed by a resin molded body by a drawing die in the axial direction. Can do
Depending on the molding material used, creep deformation may be caused by the axial force generated by the tightening torque of the piston nut 11 at the time of assembling. Therefore, a preventive measure is required.

FIG. 4 is a view showing a main part of an embodiment in which this deformation preventing measure is taken. A metal spacer 14 is arranged between the ratchet collars 7a, 7b fitted to the piston spigot part and the valve stopper 10, and It is fixed to the spigot part by spot welding 15 or caulking means. Thus, the tightening force of the piston nut 11 is blocked by the spacer 14 and is not transmitted to the collars 7a and 7b.

Further, the collars 7a and 7b may be formed by fixing a metal piece in the shape of each cam 91 or 92 by spot welding or the like on the peripheral surface of the metal cylinder in addition to the resin molded body.

If the plurality of cam projections 8 on the ratchet 6 are equally arranged in the circumferential direction, the cam groove 9a formed by the rhombic cam 91 on the collar 7a may be formed at one place. Since it is sufficient that at least two stopper portions 93 by the shaped cam 92 are formed,
This configuration is effective when the above-mentioned cam piece is attached and formed by spot welding or the like.

〔The invention's effect〕

As described above, according to the stay damper of the present invention, the extension of the piston rod is restricted by the guide function and the position restricting action by the fitting and sliding of the cam provided in the damper cylinder and the cam groove. The extension side temporary locking in the intermediate movement area of the rod can be performed, and in particular, a ratchet with a cam projection is provided on the cylinder side, and a ratchet collar having a cam groove structure is disposed on the piston rod side, so that the ratchet collar occupies. The volume can be made as small as possible, which allows the cylinder volume to be made relatively large with respect to the outer bulk, so that the degree of freedom of design is large, and without using a cover tube or the like in the conventional device. As a result, the entire stay damper can be made small and the appearance can be formed with a good appearance. Used as bets for opening aid,
It is possible to freely set the half-opening and full-opening of the door.Furthermore, in setting this open state, the temporary return operation of the door is merely performed while the door is being opened, without performing the cover cylinder rotating operation in the conventional device. The opening can be flipped up to the fully open position, and the effect is extremely remarkable in practical use.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the stay damper of the present invention, FIG. 2 is a developed view showing a configuration of a main part of the stay damper of the present invention, and FIGS. 3 and 4 are other embodiments of the stay damper of the present invention. It is a longitudinal section showing an example. [Description of Signs] 1 ... Cylinder 2, 2 ... Piston 3 ... Piston rod, 6 ... Ratchet 7a, 7b ... Ratchet collar, 8 ... Cam protrusion 9a, 9b ... Cam groove, l ... Return area 91: Diamond-shaped cam, 92: Arrow blade-shaped cam 93: Middle stopper, 94: Final stage

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16F 9/00-9/54 B60J 5/10 B62D 25/12 E05C 17/30

Claims (1)

(57) [Claims] A ratchet having a cam projection directed toward a piston rod is rotatably mounted on an inner wall of a cylinder outside a piston stroke area, and the ratchet cam projection is guided to a piston spigot portion of the piston rod during its expansion and contraction operation. A stay damper characterized in that a cam groove and a stopper for determining a locking position in the middle of movement of a cam projection are arranged in a predetermined phase relationship in a circumferential direction.