JPS5824636A - Shock preventing mechanism for rotary drive - Google Patents

Abstract

PURPOSE:To prevent the occurrence of shock sound in a shutter rotating drive opposed to an opening and closing orifice provided in a piston of a shock absorber by interposing a shock absorbing member between a solenoid and a flange abutting against the solenoid. CONSTITUTION:A rotary valve 17 arranged on the upper portion of a shock absorber is provided to rotate through a control rod 15 a shutter (not shown) for opening and closing an orifice (not shown) provided in a piston, and provided with a pair of solenoids 41, 41. Cores 42, 42 of the respective solenoids 41, 41 are interconnected by an advancing and retreating member 44 to which is connected the rod 15 by a pin 15. Then, a washer 47a of synthetic resin or the like as shock absorbing member 47 loosely fitting in the core 42 is interposed between the solenoid 41 and a flange 43 integral with the core 42. Thus, the occurrence of shock sound in the operation of the solenoid 41 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shock prevention mechanism for a rotary drive device for opening and closing an orifice of a shock absorber. There is something like this. That is, 1 is a tube, and a piston 2 divides the inside of the tube 1 into two chambers 3 and a T chamber 4, and the piston 2 is fixed to the lower end of a piston rod 5 by an orifice nut 6. 7
is the orifice of piston 2, 8 is the disc pulp, 9
is a washer.

The piston rod 5 has a radial hole 10 and an axial hole 11.
are opened, and these and the hollow part 1 of the orifice nut 6 are opened.
2 and an opening/closing orifice 13 formed in the orifice nut 6 form a passage 14 that communicates the upper and lower chambers 3.4. A control rod 15 rotatably passes through the center of the piston rod 5, and a shutter 16 is fixed to the lower end of the control rod 15 within the hollow portion 12 of the orifice nut 6. The shutter 16 includes a disk portion 16 a
and a tongue piece 16b, which rotates together with the control rod 15 to open and close the opening/closing orifice 13. The upper end of the piston rod 5 protrudes from the tube 1 and is fixed to the vehicle body, and the upper end of the control rod 15 is connected to a rotational drive device 17. The rotary drive 17 includes a gear train 18, 19, a motor 20, and a potentiometer 21.
, a power source 22 , a comparator 23 , and an angle setting device 24 .

Thus, the rotational force generated by the rotational drive device 17 is transmitted to the shutter 16 via the control rod 15,
By opening and closing the opening/closing orifice 13 with the tongue piece 16b, high damping force due only to the orifice 7 of the piston 2,
Alternatively, a low damping force can be obtained by this and the opening/closing orifice 13.

However, according to such a conventional shock absorber rotation drive device 17, the reference value of the angle setting device 24 and the output from the potentiometer 21 are compared by the comparator 23, and the power source 22 is controlled by the signal outputted from the comparator 23. A structure was used to activate or deactivate the motor 20, thereby controlling the rotation of the control rod 15 via the gear train 18. Therefore, this rotary drive device is
The structure is complicated, the number of parts is large, and the drive device 17 is large, so there is a problem in that a large space in the vehicle body must be secured for the drive device 17. Therefore, the inventor improved the rotary drive device, and the rotary drive device includes a solenoid as a drive source, a core that moves forward and backward by the magnetic force of the solenoid, a flange that is integral with the core and comes into contact with the solenoid, and a core. The above-mentioned conventional problems have been solved by providing a reciprocating member that is connected to the solenoid and moves forward and backward integrally with the solenoid.However, according to this rotary drive device using a solenoid, when the solenoid is activated, the magnetic force causes the core to move forward and backward. The flange that moves together collides with the solenoid side. According to this collision, a collision sound is generated every time the solenoid is excited, which becomes a noise source, and there is also a fear that the impact may cause damage to the flange and the solenoid side or peeling of the plating.

Therefore, in this invention, between the solenoid and the flange,
It is an object of the present invention to solve the above problem by interposing a shock absorbing member made of a material softer than that of the solenoid and the flange.

Hereinafter, the present invention will be explained based on the drawings. 2 and 3 show a first embodiment in which the present invention is applied to a shock absorber for a strut type front suspension.

First, to explain the structure, the shock absorber tube 1 is removably built into a strut tube 26 to which a steering knuckle 25 is fixed at the lower end.
It is a twin tube type consisting of an outer tube 1a and an inner tube 1b.

A piston rod 5 has an upper end protruding above the tube 1, and a piston 2 is fixed to the lower end by means described later.

The piston 2 divides the inside of the tube 1 into an upper chamber 3 and a lower chamber 4, and communicates between the two chambers 3 and 4 through piston orifices 27 and 28, while disc valves 8a and 8b on the upper and lower surfaces of the piston 2 .

A check loop is formed between the stone orifices 27 and 28 to distinguish both orifices 27 and 28 into orifices on the extension side and the contraction side of the piston rod 5.

A male thread 29° 30 is fully formed on the lower outer periphery of the piston rod 5, and a nut 31 is screwed into the upper male thread 29, and a washer 9a, a disc valve 8a, a piston 2, a disc valve 8b, and a washer 9b are attached to the lower side. externally fit onto the piston rod 5, and then screw the orifice nut 6 onto the lower male thread 30 to connect the nut 31 and the orifice nut 6.
Fix each component pipe between them. The orifice nut 6 is formed by integrally molding a nut 6a and a cylindrical hollow body 6b, and has a diameter of Φ
An opening/closing orifice 13 facing in the radial direction is opened in the air body 6b. 32 is a plug that closes the lower part of the orifice nut 6.

The piston rod 5 has a radial hole 10 and an axial hole 11.
are opened, and these and the hollow part 1 of the orifice nut 6 are opened.
2 and the opening/closing orifice 13 form a passage 14 that communicates the upper and lower chambers 3 and 4. A control rod 15 rotatably passes through the center of the piston rod 5, and a shutter 16 is fixed to the lower end of the control rod 15 within the hollow portion 12 of the orifice nut 6. The shutter 16 includes a disk portion 16a having a hole and a tongue piece 16b integrated therewith.
and a control rod 15. ! The opening/closing orifice 13 is configured to be rotated in unison to open and close the opening/closing orifice 13, and a protrusion (path in the figure) for regulating the rotation angle of the shutter 16 is provided protruding from the inner surface of the orifice nut 6. shutter 1
A coil spring 33 is fully compressed between the lower surface of the disk portion 15a of No. 6 and the upper surface of the plug 32.

At the upper end of the piston rod 5, there is a control rod 15.
A rotation drive device 17 is installed to rotate the. This installation is done by screwing the nut 34 and the plate 36 onto the male thread at the upper end of the piston rod 5, and then attaching the nut 34 to the plate 36.
The plate 36 is tightened to the side to position the plate 36 in the longitudinal direction and fix the piston rod 5 to the piston rod 5, and the base 37f of the rotary drive device 17 is fixed to this plate 36 by screws 38. . The rotation drive device 17 includes a base 37, two brackets 40.40 fixed to the base 37 with screws 39, a pair of solenoids 41.41 fixed to both brackets 40.40, and solenoids 41.4.
1 core 42.42, a flange 43.43 integrated with the core 42.42, a moving member 44 that extends between both cores 42.42 and is rotatable about the core 42.42, and moves forward and backward. It consists of a rotating plate 46 which is pivotally attached to the member 44 at an eccentric position by a pin 45 and externally fitted onto the upper end of the control rod 15 at a central position. The upper end of the control rod 15 has a width across flats, and the rotary plate 46 is fitted onto the upper end of the upper end at the center thereof, so that the two become integral in the rotation direction. solenoid 41.41
Washers 47a, 47a made of synthetic resin are interposed between the flanges 43, 434 as shock absorbing members 47 loosely fitted to the cores 42,42. Note that a washer identical to the washer 47a is interposed between the solenoid 41 and the flange 43 on the left side in the figure, but the washer is hidden by the flange 43 in a recessed part of the solenoid 41. Further, the washers 47a, 47a may be fixed to the collision surface of the solenoid 41.41 or the flange 43.43 by adhesive or the like. The washer 47a may be made of any material as long as it is softer than the materials of the solenoid 41.41 and the flange 43.43 and does not reduce the suction force of the solenoid. It may be made of leather or soft metal. Note that 4.8.48 is a no-nes that is continuous to the power supply.

The upper part of the piston rod 5 supports the vehicle body below the rotary drive device 1T. Between the vehicle body and the piston rod 5,
Between the vehicle body and the strut tube 26 are interposed a vibration isolation mechanism and a suspension mechanism (path in the figure) made of metal plates, mounting rubber, and the like. 4
Reference numeral 9 indicates a lower spring seat which forms part of the suspension mechanism and supports the lower end of the suspension spring.

Next, the action will be explained.

Attachment of the orifice nut 6 to the piston rod 5 begins by threading the nut 31 onto the male thread 29 of the piston rod 5. The nut 31 is screwed onto the piston rod 5 a little closer to the upper end than a predetermined position. Next, remove the washer 9a from the lower end side of the piston rod 5.
, disc valve 8a, piston 2, disc pulp a
Fit the washer 9b in this order, and screw the orifice nut 6 onto the male thread 30. The screwing of the orifice nut 6 is stopped with the opening/closing orifice 130 oriented in a predetermined position with respect to the piston rod, and then the nut 31 is tightened to the orifice nut 6 side. As a result, due to the action of the double nut, the orifice nut 6 is fixed with the opening/closing orifice 13 facing a predetermined position. Washers 9a+9b are fixed to the piston rod 5. Next, the control rod 15 to which the shutter 161 is fixed
Insert the coil spring 33 from below the piston rod 5.
Screw the plug 32 with the orifice nut 6 into the orifice nut 6.

The rotational position of the control rod 15 is
The tongue piece 16b of 6 is located at a position corresponding to the opening/closing orifice 13VC, and the position of the control rod 15 in the rotation direction is specified within a certain range by a projection formed in the hollow part 12 for regulating the rotation angle of the shutter 16. .

The rotary drive device 17 is assembled in advance, and a nut 34 is screwed onto the piston rod 5 at a position slightly below a predetermined position, and then onto a plate 36. Then, with the rotational direction of the plate 36 set at a predetermined position, the nut 3 is
4 is tightened upward, the plate 36 is fixed in a predetermined direction by the action of the double nand. Therefore, the rotary drive device 17 is fixed to the plate 36 with screws 38.

At this time, the upper end of the control rod 15 is connected to the rotating plate 46.
It fits in the center of the Thus, as mentioned above, plate 3
6 is fixed in a predetermined direction, the rotary drive device 1
The orientation of 7 is also fixed as specified. Therefore, the piston rod 5, the opening/closing orifice, the holder 13, the shutter 16,
The relative positions of the control rod 15 and the rotary drive device 17 are specified in a predetermined manner.

Next, the lower part of the piston rod 5 is inserted into the tube 1, and the end cap at the upper end of the tube 1 is fixed.

The tube 1 may be inserted and fixed into the strut tube 26 either before or after the piston rod 5 is inserted into the tube 1. The lower end of the strut tube 26 is
By press-fitting into the steering knuckle 25, both 25 and 26 are fixed in advance. The upper part of the piston rod 5 is attached to the vehicle body by bolting the metal plate (in the figure) of the vibration isolation mechanism to the vehicle body. The piston rod 5 is attached to the vehicle body in a state where it is facing in a certain direction. This direction is determined by attaching a metal plate ( (not shown) may be provided with direction identification ability in advance by means of attaching a mark indicating the direction.

Then, vibration input from the wheel side or the vehicle body (1t+) causes the tube 1 and piston rod 5 to move relative to each other in the axial direction, and the piston 2 moves back and forth within the tube 1.

When the piston rod 5 moves to the extension side, the upper chamber 3 becomes high pressure, and the liquid flows into the piston orifice 28? : After that, the disc valve 8b is bent downward and the water flows into the lower chamber 4.

At this time, the disc valve 8a is pressed by the piston 2 due to the high pressure in the upper chamber 3, so the piston orifice 27
remains closed. Moreover, when the piston rod 5 moves to the contraction side, the lower chamber 4 becomes high pressure, and the liquid passes through the histone orifice 27, bends the disk valve 8a (z upwards, and flows into the upper chamber. The piston orifice 28 remains closed.During the passage of liquid through the piston orifice 27,28, its orifice action provides a preset damping force.

-! Additionally, the damping force caused by the piston orifices 27, 28 can be reduced by the opening and closing orifice 13. That is, the radial hole 10, the axial hole 11, the hollow part 12,
The upper and lower chambers 3 and 4 are communicated through a passage 14 constituted by the opening and closing orifice 13, and a liquid flow is generated in the passage 14 in response to the pressure change in the upper and lower chambers 3 and 4, and the liquid flow is caused to flow through the opening and closing orifice 13. At the same time, the orifice action can reduce the damping force. This reduction in damping force due to the opening/closing orifice 13 is obtained only when the opening/closing orifice 13 is opened.
Cannot be obtained during its blockage.

The opening and closing orifice 13 is opened and closed by rotating the shutter 16.

A rotary drive device 17 opens and closes the opening and closing orifice 13 by rotating the shutter 16.

That is, the illustrated state is a closed state of the opening/closing orifice 13. In this state, the core 42 of the rotary drive device 17
, 42, flanges 43, 43, and reciprocating member 44 are located on the left side in the figure, and their positions are maintained by the weak magnetic force generated by the left solenoid 41. Now, to open the opening/closing orifice 13, press the left solenoid 4.
1 is deactivated and the right solenoid 41 is activated. Then, the core 42 on the right side 1 is excited and moved to the right by the magnetic force of the solenoid 41 on the right side, and together with this, the flange 43 on the right side, the advancing/retracting member 44, the flange 43 on the left side, and the core 42 on the left side move rightward. Moving. Since the pin 45 also moves together with this rightward movement of the advancing/retracting member 44, the rotary plate 46 rotates counterclockwise in FIG. 3. Therefore, the control rod 15 whose upper end is integrally connected to the rotating plate 46 in the rotational direction rotates in the same direction to rotate the shutter 16. Then, the opening/closing orifice 13 is opened by the rotation of the shutter 16, and the upper and lower compartments 3.4 are communicated through the passage 14.

The open state of the opening/closing orifice 13 is determined by the right solenoid 4.
1 is maintained by switching so that the weak magnetic force is fully generated after the above-mentioned operation. Note that due to the rotation of the rotary plate 46, the distance between the center of the control rod 15 and the advancing/retracting member 44 changes;
It is absorbed by rocking around 2. In addition, the reciprocating member 44 and the flange 4 due to the magnetic force of the solenoid 41.
3° 43, when the cores 42, 42 move, one of the flanges 43.43 collides with the opposing solenoid 41° 41, but the flange 43.43 and the solenoid 41.
Since a shock absorbing washer 47a is interposed between the two 43 and 41, the shock between the two 43 and 41 is alleviated. Therefore, generation of collision noise, damage to the surface of the solenoid 41, 41, and peeling of the coating film or plating can be prevented. Furthermore, when closing the opening/closing orifice 13, the left solenoid 41 may be activated and the right solenoid 41 may be deactivated, contrary to the above. As a result, each of the above-mentioned parts operates in the opposite manner to the above, and the shutter 16 opens and closes the opening/closing orifice 13.
and return to the state shown. The control of the rotary drive device 17 is such that the switches for this purpose are placed facing the driver's seat, so that a high damping force can be obtained only by the piston orifices 27 and 28 during driving according to the driving conditions. A pattern can be selected to obtain a low damping force by adding the opening/closing orifice 13 to this pattern.

FIG. 4 shows a second embodiment of the invention. In this case, as a shock absorbing member 47, a number of protrusions 47b made of the same material as in the previous embodiment, such as synthetic resin or rubber, are fixed along the edge of the flange 43 by adhesive or the like. According to this embodiment, by making the area of engagement with the solenoid 41 smaller than that of the washer 47a,
It is possible to reduce the decrease in the suction force of the solenoid 41. Incidentally, in place of the protruding piece 47b, a dog-shaped ring with an inner diameter may be similarly fixed. In addition, these projecting pieces 47b,
4. The ring may be fixed to the solenoid 41 gllll. The usage method and other configurations and functions of this rotary drive device 17 are the same as in the first embodiment.Note that in these first and second embodiments, two solenoids and two flanges are used. However, the same applies to rotary drive devices that use one or more solenoids and flanges.

As explained above, according to the present invention, there is a solenoid as a driving source, a core that moves forward and backward by the magnetic force of the solenoid, a flange that is integral with the core and comes into contact with the solenoid, and a flange that is connected to the core at an eccentric position. In a rotary drive device consisting of a rotating body that rotates as the core advances and retreats, a shock absorbing member made of a softer material than the material of the solenoid and flange is interposed between the solenoid and the flange, so that when the solenoid is energized, It is possible to prevent the collision noise between the solenoid and the flange that occurs when
Furthermore, damage to the 7-lunge and solenoid side and peeling of the plating can be prevented. Furthermore, it is possible to prevent vibrations that occur when the solenoid and flange collide.

[Brief explanation of the drawing]

Fig. 1 (4) is a partially cutaway front view of the conventional example, and Fig. 2 is a partially enlarged view of the same (A). 3 is a plan view of FIG. 2, and FIG. 4 is a partially omitted enlarged front view showing the second embodiment of the present invention. 1...Tube, 2...Piston, 3 ...upper chamber,
4... Lower chamber, 5... Piston rod, 6... Orifice nut, 13... Opening/closing orifice, 14... Passage, 15... Control rod, 16... Shutter, 17... Rotary drive device, 27.28...Piston orifice, 29.30...Male thread, 31...Nut, 34...Nand, 36...Plate, 37.
... Base, 41 ... Solenoid, 42 ... Core, 4
3... Flange, 44... Advance/retreat material, 45... Pin, 46... Rotating body (rotating plate), 47... Shock absorbing member, 47a... Washer (shock absorbing member), 47b・
・Protruding piece (shock absorbing member), 48... Harness

Claims (1)

[Claims] A rotating drive consisting of a solenoid as a driving source, a core that moves forward and backward by the magnetic force of the solenoid, a flange that is integral with the core and comes into contact with the solenoid, and a rotating body that is eccentrically connected to the core and rotates as the core moves forward and backward. 1. A shock prevention mechanism for a rotary drive device, characterized in that a shock absorbing member made of a material softer than that of the solenoid and the flange is interposed between the solenoid and the flange.