JPH0522661Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a mounting structure for an actuator used in a variable damping force type hydraulic shock absorber or the like.

BACKGROUND ART As is well known, there are various types of hydraulic shock absorbers used in automobile suspensions that are equipped with a variable damping force mechanism to adjust the damping force according to the driving conditions of the vehicle. provided.

Figures 8 and 9 show an example of this conventional variable damping force type hydraulic shock absorber. A piston rod to which a piston valve (not shown) is fixed, 3 is a vibration isolating member that attaches the other protruding end 1a of the piston rod 1 to the vehicle body panel 4, 5 is a vibration isolating member fixed to the upper side of the vibration isolating member 3, and has an outer end facing inward. The bracket 5 has a pair of bent arm portions 5a, and a damping force variable actuator 6 is attached to the upper surface of the bracket 5. That is, as shown in FIG. 9, this actuator 6 includes mounting pieces 8, 8 formed at the lower end of the casing 7 to protrude outward, and a protruding piece 9 formed opposite to the mounting pieces 8, 8. , 9 are fixed to each other by rivets 10, 10. A cylindrical retainer 11 is provided. Further, inside this retainer 11, a substantially cylindrical leg portion 12 having a locking claw 12a at the tip is provided, and a locking claw 12a is provided inside the leg portion 12 so as to extend outwardly. A biasing leaf spring 13 is fixed.

Then, the actuator 6 is attached to the bracket 5.
To attach the leg 12 to the inner end of the arm 5a of the bracket 5, push it in from above. It is firmly locked and fixed to the inner edge of the In addition, the spring force of the coil spring 14 prevents the actuator 6 from becoming unstable in the vertical direction.
(See Publication No. 34241, etc.)

Problems to be Solved by the Invention However, in the conventional actuator mounting structure described above, the locking pawl 12a and the leaf spring 1
3. Although the actuator 6 can be firmly attached to the bracket 5 by the action of the coil spring 14, etc., the total number of parts is extremely large and the structure is complicated. Furthermore, since fixing with rivets 10, 10 and installation of coil springs 14, etc., are required, the number of assembly steps is greatly increased compared to the conventional bolt tightening method. Furthermore, in order to tighten the rivets 10, 10, the amount of protrusion of the mounting pieces 8, 8 and the protruding pieces 9, 9 must be made relatively large in order to secure the tightening margin. The demand for miniaturization of pressure buffers cannot be fully satisfied.

Furthermore, as in the technique described in, for example, Japanese Utility Model Publication No. 52-160744, there is also a technique in which the upper end of the mounting clip is locked with a single touch to the clamping claws and protrusions provided on the outer surface of the casing. However, since the lower end of the mounting clip is simply locked to the lower surface of the mounting member, the locking force is small and there is a risk that it may easily come off due to vibration or the like.

Means for Solving the Problems The present invention was devised in view of the problems of the prior art, and involves inserting a bottomed cylindrical bracket at the bottom of the insertion hole into the upper end of the hollow rod. A casing housing an actuator inside is placed on a mounting piece that is fixed with a nut and bent horizontally in the radial direction at the upper end of the bracket, and the casing is bent into a substantially L shape on the mounting piece. In the mounting structure of the actuator that is attached by a plurality of mounting clips, a locking hole is formed in the vertically rising upper piece of each of the mounting clips, and a protrusion is formed on the upper surface of the horizontal lower piece. On the other hand, a pair of clamping claws are provided on the outer periphery of the casing to clamp and fix both side edges of the upper piece inserted from below, and a projection that is engaged with the locking hole is provided between the clamping claws. and on the mounting piece,
By placing the casing on the upper end of the bracket and rotating it in a predetermined direction, a fitting hole into which the protrusion fits is provided, and the circumferential wall of the protrusion on the opposite side to the direction of rotation of the casing is connected to the bottom piece. It is installed approximately perpendicularly to the upper surface of the casing, and when the protrusion and the fitting hole are fitted into the lower surface of the casing, the side edge of the mounting piece touches the side edge of the casing and the maximum rotational position of the casing is adjusted. It is characterized by the provision of a stopper for regulation.

Function To attach the actuator to the bracket that is pre-fixed to the hollow rod with a nut, first push the top piece of the mounting clip from below into the recess between the two gripping claws, so that the locking hole can easily and easily fit into the protrusion. By being firmly engaged, movement of the upper piece in the vertical and horizontal directions and separation in the radial direction are restricted.

Next, the casing is placed on the upper end of the bracket, but at this time it is positioned so that the lower piece of the mounting clip and the mounting piece of the bracket do not overlap. Next, when the casing is rotated on the upper end of the bracket, the lower piece deforms downward against its own elastic force and rides on the lower surface of the mounting piece.When the casing is further rotated, the lower piece shrinks to its original shape. The protrusion firmly fits into the fitting hole while being deformed.

At the same time, since the stopper of the casing abuts against the side edge of the mounting piece, the rotation of the casing in the same direction is reliably restricted even if the casing is further rotated with a strong force, and the vertical peripheral wall of the protrusion is also fitted. Since it is locked by engaging the edge of the hole, rotation of the casing in the opposite direction is also restricted.

Therefore, the casing is firmly and reliably attached to the bracket, and accidental falling off is more reliably prevented.

Since the installation work is completed only by a simple rotation of the casing, the efficiency of the installation work can be improved, and the structure is greatly simplified since only L-shaped elastic mounting clips are used. be converted into

Embodiment FIG. 1A shows an embodiment of the actuator mounting structure according to this invention, and 21 in the figure is a cylinder (not shown) whose one end is filled with hydraulic fluid. The hollow piston rod 22 that is permanently inserted is an insulator that is a vibration isolation mechanism provided at the other protruding end 21a of the piston rod 21 via an upper spring seat 23 and a bearing 24. The upper end of is fixed to the vehicle body panel 25.
Further, a substantially cup-shaped bracket 26 is fastened and fixed to a small diameter portion of the other end 21a of the piston rod on the upper end side of the insulator 22 by upper and lower nuts 27, 27. Furthermore, the bracket 26
An actuator 29 for varying the damping force is attached to the upper end of the damping force by a mounting clip 28.

To be more specific, the bracket 26 is
As shown in FIGS. 2A and 2B, a D-shaped insertion hole 30 through which the other end 21a of the piston rod is inserted is bored in the center of the bottom wall, and a D-shaped insertion hole 30 is formed in the center of the bottom wall. A flange portion 32 is formed at the upper edge of the cylindrical side wall 31, and the flange portion 32
A pair of attachment pieces 33, 33 with a small protrusion are formed on the outer edge in the diametrical direction so as to protrude outward horizontally.
Further, approximately in the center of the mounting pieces 33, there is a fitting hole 34 into which one end of the mounting clip 28 is fitted.
34 are drilled in each case.

On the other hand, the actuator 29 is connected to the piston rod 2 via a drive rod (not shown) inserted into the interior from the open end of the other end 21a of the piston rod.
1. It controls the rotation of an adjuster having a damping force variable orifice installed inside the adjuster according to vehicle running conditions, and is integrally formed of synthetic resin material as shown in Fig. 3 A, B, and C. A pair of holding parts 36, 36 with small protrusions are provided along the diametrical direction on the lower outer peripheral edge of the approximately circular casing 35, corresponding to the mounting pieces 33, 33 of the bracket 26.
5 and is integrally formed in a protruding manner. This holding part 3
6 and 36 each have a substantially trapezoidal planar shape, and have a pair of clamping claws 37 bent inwardly on both sides of the distal end side for clamping both side edges of the mounting clip 28, and on the distal end side. In the center of the recess, there is the clamping claw 3.
A projection 38 is formed which cooperates with the mounting clip 28 to hold the mounting clip 28. This protrusion 38 is
As shown in FIG. 1B, the upper edge 38a is formed perpendicularly to the outer circumferential surface of the casing 35, while the lower edge 38b is notched in an inclined shape to facilitate insertion of the mounting clip 28. ing.
In addition, each holding portion 36, 36 on the lower surface of the casing 35
In the vicinity, stoppers 39, 39 are protrudingly provided so that the side edges of the mounting pieces 33, 33 come into contact with each other when the mounting pieces 33, 33 are attached to the bracket 26 to restrict rotation beyond a predetermined level. In the figure, 40 is an output shaft of the actuator facing a through hole 41 bored in the center of the lower surface of the casing 35, and 42 is a connector portion formed on the side of the casing 35. A signal from a control circuit (not shown) is output to an electromagnetic coil or the like inside the casing 35.

Furthermore, the mounting clip 28 is shown in FIG.
As shown in B and C, it is formed by bending a metal elastic member into a substantially L-shape, and the elastic force is set to be relatively large. is cut out in the vertical direction so that both side parts 44, 44 have a length slightly smaller than the length between the two clamping claws 37, 37 of the holding part 36, and the protruding part 38 is cut out approximately in the center. A rectangular locking hole 45 for locking is formed. Furthermore, a protrusion 38 is provided above the locking hole 45 of the upper piece 43.
In order to facilitate the locking action, a guide piece 46 is formed which is bent outward in a substantially dogleg shape.
In addition, the upper and lower pieces 4 are attached to the bent portions at the bottom of the locking hole 45.
Perforation 4 that reduces the elastic force in the opening direction of 3 and 48
7 is formed. Further, the substantially rectangular lower piece 48 extending in the horizontal direction is arranged with a predetermined gap from the lower surface of the casing 35 when the upper piece 43 is engaged with the holding part 36. A protrusion 49 is formed approximately in the center of the bracket 26, and the protrusion 49 is elastically fitted into the fitting hole 43 of the bracket 26 from the side. As shown in FIG. 5, this protrusion 49 has a substantially trapezoidal longitudinal section, and has a flat upper wall 49a that slides into contact with the lower surface 33a of the mounting piece 33. The insertion side peripheral wall 49b of the protrusion that first comes into contact with the side edge of the piece 33
is shaped like a gentle slope with a rising angle θ ₁ of about 135°, while the removal side surrounding wall 49c located on the opposite side to the insertion side surrounding wall 49b, that is, in the opposite direction to the rotational direction of the casing 35, has a rising angle θ 1 of about 135°. It is formed into a substantially vertically steep slope with an angle θ ₂ of approximately 120°.

Note that both sides 50, 50 of the lower piece 48 are bent downward in a triangular shape to fit into the fitting hole 34 of the protrusion 49.
This makes it easier to fit the lower piece 48 into the lower piece 48, and improves the bending strength of the lower piece 48.

The operation of the above configuration will be explained below. First, in the holding part 36 of the casing 35,
Attach the mounting clip 28 in advance as shown in B and C. That is, the upper piece 4 of the mounting clip 28
3 from below into the recess between the gripping claws 37, 37 of the holding part 36, and push it further using the guide piece 46, the locking hole 45 locks with the protrusion 38, and at the same time the both side parts 44, 44 are both gripping claws 37,
37 is firmly locked. Thereby, the attachment clip 28 can be attached to the holding portion 36 with a single touch.

Next, the casing 35 is placed on the flange portion 32 of the bracket 26 while the output shaft 40 is engaged with the drive rod in the piston rod 21. At this time, the lower pieces 48, 48 of the mounting clips 28, 28 are
is positioned so as to be shifted in the circumferential direction so as not to overlap the mounting pieces 33, 33 of the bracket 26. Subsequently, the casing 35 is attached to the insertion side peripheral wall 49b of the projections 49, 49,
When 49b is set to the rotation side position and rotated in one direction, the lower pieces 48, 48 deform downward to enlarge the L-shaped angle, and the insertion side peripheral walls 49b, 49
b smoothly runs over one side edge of the mounting pieces 33, 33 with its gentle slope, and the protrusions 49,
49 slides on the lower surfaces 33a, 33a of the mounting pieces 33, 33 and reaches the positions of the fitting holes 34, 34 of the bracket 26. Here, the enlarged L-shape of the lower pieces 48, 48 elastically returns to its original shape, and the protrusions 49, 49 are firmly fitted into the fitting holes 34, 34. This completes the work of attaching the casing 35 to the bracket 26. Also,
When the protrusion 49 and the fitting hole 34 are fitted, one side edge of each mounting piece 33 collides with the stopper 39, so that further rotation in the same direction is restricted. On the other hand, since the removal side circumferential wall 49c of the protrusion 49 is engaged with the hole edge 34a of the fitting hole 34 by its steeply inclined end surface, rotation in the opposite direction is reliably restricted. In this way, the casing 35 can be easily attached to the bracket 26 by simply rotating the casing 35, so that the efficiency of the attachment work is sufficiently improved compared to the conventional method. In addition, the spring force of the mounting clip 28 and the strong locking action of the protrusion 49 on the fitting hole 36 ensure that it is attached to the bracket 26, and as described above, the stopper 39 on the mounting pieces 33, The direction of rotation of the casing 35 due to the collision of the holes 39 and the detachment side peripheral walls 49c, 49 with respect to the hole edges 34a, 34a of the respective fitting holes 34, 34.
The respective rotations of the casing 35 in the reverse direction due to the locking of the casing 35 are reliably regulated. Therefore, the casing 35 can be firmly and reliably attached to the bracket 26 at all times, and the casing 35 will not be inadvertently removed from the bracket 26 due to large vibrations of the vehicle. Further, since the holding portion 36 can be molded integrally with the casing 35, the molding work is easy, and the mounting piece 33 can also be molded integrally with the bracket 26, so the molding work is easy. Further, the mounting clip 28 is also extremely easy to manufacture by pressing or the like because of its simple shape. Therefore, the overall manufacturing work becomes easier and it is advantageous in terms of cost.

Further, the protrusion 49 is formed by cutting out the detachment side peripheral wall 49c from the vertical direction as shown in FIG.
It is also possible to form each edge of the upper wall 49a and both side walls 49d at a right angle θ ₃ . In this case, both walls 49c,
Since the end edge 49d is more firmly engaged with the hole edge 34a of the fitting hole 34, the attachment state of the casing 35 to the bracket 26 becomes more secure.

Note that the configurations of the holding portion 36, the mounting piece 33, and the mounting clip 28 are not necessarily limited to those of the above embodiment.

Effects of the invention As is clear from the above explanation, with the actuator mounting structure according to this invention, the upper piece of the mounting clip can of course be firmly fixed with one touch by the gripping claws and protrusions of the casing. By rotating the casing to the left or right, the mounting clip fixed to the casing can be easily and firmly fitted into the fitting hole of the bracket through its own elastic spring force. .

In particular, when the protrusion is fitted into the fitting hole as described above, the stopper on the bottom surface of the casing simultaneously hits the side end of the mounting piece, and the substantially vertical peripheral wall of the protrusion is locked to the edge of the fitting hole. Therefore, the free rotation of the casing in forward and reverse directions is reliably restricted, so that the casing can be more firmly attached to the bracket, and the casing can be prevented from accidentally falling off due to vibrations or the like.

Moreover, since the overall structure is simplified and the number of parts can be greatly reduced, manufacturing workability can be improved and manufacturing costs can be reduced.

Furthermore, since there is no need for fixing space for rivets, etc., as in the past, the casing can be made as small as possible.As a result, when this invention is applied to a hydraulic shock absorber, it is possible to reduce the size of the casing, which is required due to the installation layout. It is possible to satisfy the demand for downsizing of hydraulic shock absorbers.

[Brief explanation of the drawing]

FIG. 1A is a sectional view showing an embodiment of the actuator mounting structure according to this invention, FIG. 1B is an enlarged view of essential parts of this embodiment, and FIG. 2A is a plan view showing a bracket of this embodiment. Figure B is a longitudinal sectional view of Figure A, Figure 3A is a plan view showing the casing of this embodiment, Figure B is a side view of the casing, Figure C is a bottom view of the casing, and Figure 4. Figure A is a front view showing the mounting clip of this embodiment, Figure B is a bottom view of the same mounting clip, Figure C is a side sectional view of Figure A, and Figure 5 is a vertical cross section showing the protrusion of this mounting clip. figure,
Fig. 6 is a vertical sectional view showing another example of this protrusion, Fig. 7 A, B, and C are a plan view, side view, and bottom view of the casing to which the mounting clip is attached, respectively, and Fig. 8 is a conventional actuator. FIG. 9 is a sectional view showing the mounting structure and a side view of the actuator. 21...Piston rod, 21a...Protruding other end, 26...Bracket, 28...Mounting clip, 29...Actuator, 33...Mounting piece,
34... Fitting hole, 35... Casing, 36...
Holding part, 37... Clamping claw, 38... Protrusion, 39
... Stopper, 45 ... Locking hole, 44 ... Upper piece (one end), 48 ... Lower piece (other end), 49 ... Projection, 49b ... Insertion side peripheral wall, 49c ... Removal side Peripheral wall.

Claims (1)

[Scope of utility model registration request] A bottomed cylindrical bracket is inserted into the upper end of the hollow rod through an insertion hole having a bottom thereof and fixed with a nut, and a mounting piece is bent horizontally in the radial direction at the upper end of the bracket. In an actuator mounting structure in which a casing containing an actuator is placed therein, and the casing is attached to the mounting piece using a plurality of mounting clips bent into a substantially L shape, each of the mounting clips is vertically bent. A locking hole is formed in the rising upper piece, and a protrusion is formed on the upper surface of the horizontal lower piece, while both side edges of the upper piece inserted from below are clamped and fixed to the outer periphery of the casing. A pair of clamping claws are provided, and a protrusion that is engaged with the locking hole is provided between the clamping claws, and the mounting piece includes:
By placing the casing on the upper end of the bracket and rotating it in a predetermined direction, a fitting hole into which the protrusion fits is provided, and the circumferential wall of the protrusion on the opposite side to the direction of rotation of the casing is connected to the bottom piece. It is installed approximately perpendicularly to the upper surface of the casing, and when the protrusion and the fitting hole are fitted into the lower surface of the casing, the side edge of the mounting piece touches the side edge of the casing and the maximum rotational position of the casing is adjusted. An actuator mounting structure characterized by providing a regulating stopper.