JP2582791Y2 - Fixed structure of rebound spring - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention relates to a rebound scan purine grayed by a pair of spring bearing member which is slidably fitted in the piston rod
The present invention relates to a structure for fixing a rebound spring of a shock absorber which supports both ends of the rebound spring.

[0002]

2. Description of the Related Art Conventionally, as a hydraulic shock absorber used for a vehicle or the like, for example, as shown in FIG.
1, a piston rod 103 is inserted from above into the damper cylinder 102, and a piston 104 for generating a damping force is fixed to the tip of the piston rod 103.
3. A stopper 106 is fitted around the outer periphery of the
A stopper rubber 107 is provided on the upper surface of the outer tube 101. Between the stopper rubber 107 and a rod guide 108 inside the upper end of the outer tube 101, both ends of rebound collars 109, 110 slidably fitted on the piston rod 103 are provided. Spring 111 with press-fitted parts
Some are interposed.

[0003]

However, as in the above-described conventional shock absorber, the rebound spring 111
When the rebound collars 109 and 110 are simply press-fitted to both ends and joined together, the rebound spring 111 and especially the lower rebound collar 110 are disconnected due to aging, temperature rise, and load pressure in the pulling-out direction. , When the rebound spring 111 operates the damper cylinder
Or scratched in contact with 102 and piston rod 103, which may or generating noise when the rebound collar 110 is fitted that has left the rebound spring 111 during rebound.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a spring receiving device which includes a cylindrical portion and a rebound spring.
And a flange that supports the end of the ring. After the tip of one cylinder is movably inserted into the tip of the other cylinder ,
Stopper cylindrical portion of the square to limit the extension of Rutotomoni rebound spring to prevent the exit from the other of the cylindrical portion
The portions were each formed at the tip of the cylindrical portion . In addition, a slit is provided in the stopper portion of the spring receiving member that slides on the piston rod so as to allow its diameter to be reduced.

[0005]

Since the pair of spring receiving members are slidably connected to each other as long as the stopper portion engages, the spring receiving members do not come off from the spring due to aging, excessive temperature rise, and load in the pulling direction. The fall of the spring holder is prevented.
Further, this provided with slits to allow reduced diameter the spring receptacle
And at the stopper portions of the spring receptacle can Komu easily fitted, further, because after assembling the two spring receptacle on the piston rod diameter of the spring receptacle by the rod is prevented, the stopper portion Is secured.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is an upper sectional view of a shock absorber to which the present invention is applied, FIG. 2 is an exploded view of a rebound collar of the shock absorber, and FIG. 3 is an explanatory view showing a connecting process of the rebound collar.

In FIG . 1, a damper cylinder 2 is erected in an outer tube 1 and a piston rod 3 is held in the damper cylinder 2 from above by a holder 5 fitted on the inner peripheral surface of the upper end of the outer tube 1. The piston 7 is inserted through the oil seal 4 and the rod guide 6, and a piston 7 that is in sliding contact with the inner peripheral surface of the damper cylinder 2 is fixed to the tip of the piston rod 3, and the piston 7 is provided with an oil passage 8 for generating a damping force. A valve 9 for opening and closing the oil passage 8 is mounted.

A rebound stopper 11 is fitted to an intermediate portion of the piston rod 3, and a stopper rubber 12 is fitted to an upper surface of the rebound stopper 11 to reduce a shock when the rebound stopper 11 is extended.

The lower end surface of the rod guide 6 above the damper cylinder 2 and the stopper rubber 1 of the piston rod 3
Between the 2, the piston rod 3 the outer peripheral surface to have a clearance of the rebound collar 13 is a cylindrical pair of spring receiving members slidably fitted to these rebounds color 13 A large number of end winding portions at both ends of the rebound spring 15 are screwed and interposed.

In FIG . 2, this rebound collar 13
Is provided on a cylindrical portion 13a and an upper end portion of the cylindrical portion 13a.
A spiral step 16 with which the upper end turn of the rebound spring 15 (see FIG. 1) is screwed is formed on the outer peripheral surface of the cylindrical portion 13a on the side of the flange 13b . forming a strike Tsu path portion 17 at the lower end plane of the part 13a
Things. In addition, the rebound collar 14 includes the cylindrical portion 1.
4a and a flange 14b provided at a lower end of the cylindrical portion 14a.
And a rebound collar on the tip side of the cylindrical portion 14a.
13 has a smaller diameter than the cylindrical portion 13a , and a spiral step 18 is formed on the outer peripheral surface of the lower end portion to screw the lower end turn portion of the rebound spring 15, and the stopper portion 17 of the rebound collar 13 is formed on the outer peripheral surface of the upper end portion. Corresponding stopper part 1
9, and a plurality of slits 20 are formed in the upper end portion in the axial direction .

These rebound collars 13 and 14 are
After screwing the end turns of both ends of the rebound spring 15,
By pressing the rebound collar 14 into the rebound collar 13 from the stopper 19 side as shown in FIG.
As shown in FIG. 2B , the stopper portion 19 is bent inward, so that the stopper portion 19 easily enters the rebound collar 13 and the rebound collar 13 and the rebound collar 14 can move. However, as shown in FIG. Since the stopper portions 17 and 19 of the rebound collars 13 and 14 are engaged at the end, the rebound collar 13 and the rebound collar 14 are engaged.
Will not come off.

[0012] Since the structure described above, the piston rod 3 slides in the rebound collar 13, 14 at the time of expansion and contraction of the shock absorber, the rebound spring 15 becomes free condition in about compression line, as extended enough extension line While forming the rebound effect in time, since this time is movably coupled to the rebound collar 13 and rebound collar 14 for supporting both ends of the rebound spring 15, aging, excessive temperature rise, the load in the drawing direction Even when such a situation occurs, the rebound collars 13 and 14 do not come off from the rebound spring 15.

Moreover, since the piston rod 3 is inserted into the inside of the rebound collars 13 and 14, the stopper 19 at the upper end of the rebound collar 14 does not bend inward and come off the stopper 17 of the rebound collar 13. So, rebound color 13 and rebound color 1
The bond with No. 4 does not come off. Also, the rebound spring 15 is a spiral of the rebound collars 13 and 14.
Since it is screwed into the stepped portions 16 and 18, the rebound springs 15 and the rebound collars 13 and 1 are more reliably connected.
4 can be prevented from falling off.

Further, since the rebound collars 13 and 14 are interposed between the rebound spring 15 and the outer peripheral surface of the piston rod 3 over the entire length of the rebound spring 15, the rebound spring 15 comes into contact with the damper cylinder 2 and the piston rod 3 during operation. The rebound springs 15 with the rebound collars 13 and 14 attached to both ends are inserted into the piston rod 3 during assembly, so that burrs and the like do not occur on the damper cylinder 2.

In the above-described embodiment, an example has been described in which the present invention is applied to the fixing of the rebound spring and the rebound collar that supports the rebound spring. However, the present invention is also applicable to the fixing of the auxiliary spring of the suspension spring and the collar. it can.

[0016]

As described above, according to the present invention, the spring receiving member supports the cylindrical portion and the end of the rebound spring.
After the tip of one cylindrical part is movably inserted into the tip of the other cylindrical part , the other cylindrical part is
The stopper portion for limiting the extension of Rutotomoni rebound spring to prevent the escape from the square of the cylindrical portion, the cylindrical portion
Since each formed at the tip , aging, excessive temperature rise,
The spring does not come off the spring due to the load in the pulling-out direction, so that the spring holder can be prevented from falling off. Therefore, when the spring holder comes off from the spring and the spring comes into contact with the damper cylinder or the piston rod during operation, the spring may be damaged, or noise may be generated when the spring comes off and the spring receiver fits. Can be prevented.
In addition, since the stopper portion of the spring receiving member that slides on the piston rod is provided with a slit that allows its diameter to be reduced, the stopper portions of both spring receiving members can be easily fitted. After being assembled to the piston rod, the rod prevents the diameter reduction of the spring receiver, so that the engagement of the stopper portion can be ensured.

[Brief description of the drawings]

FIG. 1 is a top sectional view of a shock absorber to which the present invention is applied.

FIG. 2 is an exploded view of a rebound collar of the shock absorber.

FIG. 3 is an explanatory view showing a joining process of the rebound collar.

FIG. 4 is a top sectional view of a conventional shock absorber.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer tube, 2 ... Damper cylinder, 3 ... Piston rod, 7 ... Piston, 12 ... Stopper rubber,
13, 14 ... spring holder ( rebound collar ) , 13
a, 14a: cylindrical portion, 13b, 14b: flange portion, 15: rebound spring, 17, 19: stopper portion, 16,
18 ... spiral stepped portion, 20 ... slit.

Claims (2)

(57) [Scope of request for utility model registration] In a shock absorber in which both ends of a rebound spring are supported by a pair of spring receivers slidably fitted on a piston rod, the spring receiver is connected to a cylindrical portion and a rib.
And a flange supporting the end of the wind spring, and after movably inserting the tip of one cylindrical portion into the tip of the other cylindrical portion , one of the cylindrical portions is moved from the other cylindrical portion. Exit
Limit the expansion of the Rutotomoni rebound spring to prevent the
A fixing structure for a rebound spring , wherein stopper portions to be formed are respectively formed at the distal ends of the cylindrical portions . The place to 2. A sliding contact with the piston rod
The rebound spring fixing structure according to claim 1, wherein a slit for allowing the diameter of the stopper to be reduced is provided in a stopper portion of the spring receiver .