JPS5824634A - Shock absorber - Google Patents

Abstract

PURPOSE:To enable an opening and closing orifice and a shutter rotating device to be set in any mounting direction by providing a piston dividing a tube into two chamber and said orifice communicating to said both chambers to provide a variable attenuation force system shock absorber. CONSTITUTION:An orifice nut 6 is threaded onto a male screw 30 formed on the lower outer periphery of a piston rod 5 having on the lower end a piston 2 inserted into a tube 1. An opening and closing 13 opens radially to a hollow body 6b of the nut 6 and is constituted to be opened and closed by a shutter 16 rotated by a rotary valve 17 through a control rod 15. Then the threading of said nut 6 is stopped after the rotating direction of said orifice 13 is directed to a predetermined position relative to the piston rod 5. Next, a nut 31 on the upper side male screw 29 is tightened to the nut 6 side to fixedly set the orifice nut 6 to a predetermined direction.

Description

[Detailed description of the invention] Regarding.

Ha, for example, as a conventional shock absorber of this kind!
There is something like the one shown in Figure '1. That is, 1 is a tube, and a piston 2 moves inside the tube 1 into an upper chamber 3 and a lower chamber 4.
The piston 2 is fixed to the lower end of the piston rod 5 with an orifice nut 6. 7 is piston 2
8 is a disk pulp, and 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, a passage 14 is formed which communicates both 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 consists of a disk portion 16a and a tongue piece 16b, and 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 connected and fixed to the vehicle body side.
connected to. The rotary drive device 17 has a gear train 18.19.
, motor 20, potentiometer 21, and power supply 22
, a comparator 23, and an angle setting device 24.

Therefore, the rotational force generated by the rotational drive device 17, the control rod 15'! i=via sea'['7116
By opening and closing the opening/closing orifice 13 with the tongue piece 16b, a high damping force due only to the orifice 7 of the piston 2 or a low damping force due to this and the opening/closing orifice 13 is obtained.

However, according to such a conventional example, the orifice nut 6 was attached to the piston rod 5 by simply screwing the orifice nut 6 into the male thread of the piston rod 5. Even if the torque is constant, there is a problem in that it is not possible to determine which direction the opening/closing orifice 13 faces in the direction of rotation of the orifice nut 60. Since the position of the opening/closing orifice 13 cannot be specified in the rotational direction of the orifice nut 6, the rotational direction positions of the shutter 16 and the control rod 15 that open and close it cannot be specified with respect to the piston rod 5. However, since the direction of the rotary drive device 17 attached to the upper end of the piston rod 5 cannot be specified, when assembling the 7-yonk absorber to the vehicle body,
It is necessary to individually check the positions of the opening/closing orifices 13 and install the rotation drive device 17 in accordance with the confirmed positions. Then, since the mounting direction of the rotary drive device 17 is individually different, the mounting space is
It must be wide enough to allow attachment in any direction, and since the direction in which the harness protrudes from the rotational drive device 17 is not specified, there is a risk that the harness may interfere with other parts depending on the direction. be. In particular, when the rotary drive device 17 is composed of a mechanism having a reciprocating motion part and a motion direction changing part that converts the reciprocating motion into a rotary motion and rotates the control rod 15, If the dimensions are significantly different, a particularly large installation space for the rotary drive device 17 must be ensured.

The present invention has been made by focusing on such conventional problems, and uses means for positioning a hollow body in which an opening/closing orifice is formed in the same direction of rotation with the control rod as the center of rotation. identify,
By fixing it to the piston rod, the shutter can be positioned in the same direction, thereby determining the relative position of the piston rod and control rod, and positioning the rotary drive device, thereby solving the above-mentioned conventional problems. It aims to solve the problem.

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

First, to explain the configuration, the shock amplifier tube 1 is removably built into a strut tube 26 that has a steering knuckle 25 fixed to its 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 a piston orifice 27, 28, while disc pulps 8a and 8b on the upper and lower surfaces of the piston 2 The check pulp of the orifices 27, 28 is made to distinguish the two orifices 27, 28 into the contraction side and the expansion side of the biston rod 5, respectively.

A male thread 29° 30 is formed on the outer periphery of the lower part of the piston rod 5, and a nut 31 is screwed into the upper male thread 29, and a washer 9a, a disc pulp 8a1 piston 2, a disc pulp 8b1 washer 9b are attached to the lower side of the piston rod. The rod 5 is fitted externally, and the orifice nut 6 is screwed onto the lower male thread 30.
The respective parts are fixed in between. The orifice nut 6 is formed by integrally molding a naso 6a and a cylindrical hollow body 6b, and opens an opening/closing orifice 13 oriented in the radial direction in the hollow 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.
It is configured to rotate together with the control rod 15 to open and close the opening/closing orifice 13, and
A protrusion that regulates the rotation angle of the shutter 16 (path in the figure)
is provided protruding from the inner surface of the orifice nut 6. shutter 16
Between the lower surface of the disk portion 16a and the upper surface of the plug 32,
The coil spring 33 is compressed.

Upper end of piston rod 5, control rod 15
A rotary drive device 17 is installed to rotate the . This installation is done by attaching a nut 34 to the male thread at the upper end of the piston rod 5.
and plate 36, and then screw the nut 34 onto the plate 3.
positioning the plate 36 in the longitudinal direction by tightening it to the 6 side;
The plate 36 and the biston rod 5 are fixed, and the base 37 of the rotary drive device 17 is attached to the plate 36 by screws 3.
This is done by stopping 8. The rotation drive device 17 includes a base 37 and two brackets 4 fixed to the base 37 with screws 39.
0.40, a pair of solenoids 41.41 each fixed to both brackets 40.40, and each solenoid 41.41
a core 42.42, a flange 43.43 integral with the core 42.42, an advancing/retracting member 44 which is provided between both cores 42.42 and is rotatable about the core 42.42, and an advancing/retracting 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.
It consists of 6. The upper end of the control rod 15 has a width across flats, and the rotating plate 46 is fitted onto the upper end at the center thereof.
Both become integral in the direction of rotation. A shock absorbing washer 47 loosely fitted to the core 42.42 is interposed between the solenoid 41.41 and the flange 43.43. 48.48
is a harness connected to the power supply.

The upper part of the piston rod 5 supports the vehicle body below the rotary drive device 17. 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 spring (path in the figure) made of a metal plate, mounting rubber, and the like. A lower spring seat 49 is a component of the suspension spring and supports the lower end of the suspension spring.

Next, the action will be explained.

The process starts by screwing the orifice nut 6 onto the piston rod 5 and 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 biston rod 5.
, the disk pulp 8a, the piston 2, the disk valve 8b1, and the washer 9b are fitted in this order, and the orifice nut 6 is screwed onto the male thread 30. The screwing of the orifice nut 6 is as follows:
The rotational direction of the opening/closing orifice 13 is directed to a predetermined position relative to the biston rod, and then stopped.
Tighten the nut 31 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, and at the same time, the nut 31 and the orifice nut 6 cause the piston 2 and the disc pulp 9ay8b to be fixed.
The s washer 9at9b is fixed to the piston rod 5. Next, the control rod 15 to which the shutter 16 is fixed
Insert from the bottom of the histone rod 5, and the coil spring 33
The plug 32, which is arranged with

The rotational position of the control rod 15 is
The tongue piece 16b of No. 6 is located at a position corresponding to the opening/closing orifice 13, and the position of this control rod 15 in the rotational direction is as follows.
The rotation angle of the shutter 16 is specified within a certain range by a projection formed in the hollow part 12 to regulate the rotation angle of the shutter 16.

The rotation 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 a plate 36 is screwed onto the nut 34. 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 nut. Therefore, the rotary drive device 1T is fixed to the plate 36 with screws 38. In this case, the upper end of the control rod 15 is connected to the rotating plate 4.
It fits into the center of 6. Thus, since the orientation of the plate 36 is fixed in a predetermined direction as described above, the orientation of the rotary drive device 17 is also fixed in a predetermined direction. Therefore, the piston rod 5, the opening/closing orifice 13, the shutter 16,
The relative positions of the control rod 15 and the rotary drive device 1T are specified as specified.

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.

Next, the tube 1 is inserted into the strut tube 26 and fixed. Note that by press-fitting the lower end of the strut tube 26 into the steering knuckle 25, both
6 is fixed in advance (. The upper part of the piston 5 is attached to the vehicle body by bolting the metal plate (not shown) of the vibration isolation mechanism to the vehicle body. At this time, the rotary drive device The piston rod 5 is attached to the vehicle body with the directions of the nozzle 17 and the male 4B pointing in a predetermined direction. A metal plate (not shown in the drawings) fixed to the vehicle body may be provided with direction identification ability in advance, such as by attaching a mark indicating the direction.

When vibration is input from the wheel side or the vehicle body side, the tube 1 and the piston rod 5 move relatively 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 passes through the piston orifice 28, bends the disc valve 8b downward, and flows into the lower chamber 4. At this time, the disk valve 8a is pressed by the piston 2 due to the high pressure in the upper chamber 3, so the piston orifice 2T 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 piston orifice 2T and bends the disc valve 8a upward.
When flowing into the upper chamber, conversely, the piston orifice 2
8 maintains a closed state. Thus, the piston ori
When the liquid passes through the orifice 27, 28, a preset damping force is obtained due to its orifice action.

Furthermore, the damping force due to the piston orifice 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,
By means of a passageway 14 consisting of an opening and closing orifice 13,
The upper and lower chambers 3 and 4 are communicated with each other, thereby creating a liquid flow in the passage 14 in response to the pressure change in the upper and lower chambers 3 and 4, and reducing the damping force by the orifice action when passing through the opening and closing orifice 13. obtain. This reduction in damping force due to the opening/closing orifice 13 is obtained only when the opening/closing orifice 13 is opened, and cannot be obtained when it is closed. The opening and closing orifice 13 is opened and closed by rotating the shutter 16.

The rotation drive device 1T opens and closes the opening and closing orifice 13 by rotating the shack 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. 1. To open the opening/closing orifice 13, press the left solenoid 4.
1 is deactivated and the right solenoid 41 is activated. Then, the magnetic force of the right solenoid 41 causes the right core 4 to
2 is excited and moves to the right, and together with this, the flange 43 on the right side, the advancing/retreating member 44:% flange 43 on the left side, and the core 42 on the left side move to the right side. 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 core roll rod 15 whose upper end is connected to the rotary plate 46 in the rotational direction rotates in the same direction to rotate the shutter 16. The opening/closing orifice 13 is opened by the rotation of the shutter 16, and the upper and lower chambers 3 and 4 are communicated with each other 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 to generate a weak magnetic force after the above operation. Note that, due to the rotation of the rotary plate 46, the center of the control rod 15 and the advancing/retracting member 44
The distance between the core 4 and the core 4 changes.
2 It is absorbed by swinging around the entire center. In addition, the reciprocating member 44 and the flange 4 due to the magnetic force of the solenoid 41.
3°43, 1. When moving the core 42.42. Either flanges 43.43 are opposed. Although it collides with the lensoid 41°41, the flange 43.43 and the solenoid 41
．． Since a shock absorbing washer 47 is interposed between the two parts 4 and 41, the impact between the two parts 4 and 41 is alleviated. Therefore, occurrence of the collision 1, damage to the surface of the solenoid 41, 41, and peeling of the coating film or plating can be prevented. moreover,
When closing the opening/closing orifice 13, the left solenoid 41 is activated in the opposite manner to the above, and the i-side solenoid 4 is activated.
1 should be deactivated. Due to this, each of the above-mentioned parts operates in the opposite manner to the above, and the shutter 16 opens and closes the orifice 13.
It is fully occluded and returns to the state shown. The control of the rotary drive device 17 is such that a damping force is obtained by the IC at only the piston orifice 27, 28 during driving according to the driving conditions by placing the steering system for this purpose near the driver's seat. According to the present invention, according to the present invention, the hollow body forming the opening and closing orifice is The positions of the opening and closing orifices in the same direction were identified by means of positioning means in the rotation direction with the control rod as the rotation center, and fixed to the piston rod. Therefore, the positions of the shutter that opens and closes the IJ valve and the control rod in the rotational direction can be specified in advance, so the relative positions of the piston rod and the control rod in the rotational direction can be specified in advance. Therefore, the relative position in the rotational direction of the rotary drive device connected to the control rod and the piston rond can be specified. Therefore, if the piston rond is arbitrarily fixed to the vehicle body in the rotational direction, the direction of the rotary drive device with respect to the vehicle body can be determined. can be arbitrarily set in advance. As a result, the space on the vehicle body side for the rotary drive device can be reduced as much as possible, and the protruding direction of harnesses and wires that are continuous from the rotary drive device to other devices can also be specified, so these can be easily removed from other devices. This has the effect of avoiding interference with parts. In addition, since the rotational position of the control rod and the piston rond is fixed relative to each other, when fixing the rotary drive device to the piston rond, all you have to do is attach the rotary drive device to the upper end of the control rod. Since the relative position of the rotary drive device and the piston rond can be determined without having to perform orientation work, the number of man-hours for assembly work can be significantly reduced.

[Brief explanation of the drawing]

1(5) is a partially cutaway front view of the conventional example, FIG. 1(B) is a partially enlarged view of FIG. 1(G), FIG. The figure is a plan view of the rotary drive device shown in FIG. 2. 1...Tube, 2...Piston, 3...Upper chamber,
4... Lower chamber, 5... Piston rond, 6... Orifice nut, 6a... Nut, 6b... Hollow body, 1
3... Opening/closing orifice, 14... Passage, 15...
Control Rondo, 16...Shutter, 17...
Rotary drive device, 27.28... piston orifice,
29.30... Male thread, 31... Nut 1, 34.
...Natsuto, 36...Plate, 37...Base, 4
0...Bracket, 41...Renoid, 42...
・Core, 43...7 lunge, 44...advance/retreat material, 45
... Pin, 46 ... Rotating plate, 47 ... Shock absorbing washer, 48 ... No. 1-ness Patent applicant Nissan Motor Co., Ltd. Tokico Co., Ltd. Agent Patent attorney Tetsuya Mori Patent attorney Yoshiaki Naito Patent Attorney
Shimizu Figure 1 (A)

Claims (3)

[Claims] (1) A piston that divides the inside of the tube into two chambers, a piston rod that holds this piston at one end and projects the other end outside the tube, and a piston rod that extends in the axial direction inside this piston rod and has an outer end outside the piston rod. a rotatable control rod protruding from the piston rod, a rotary drive device connected to the outer end of the control rod to rotate the control rod, a passageway communicating with the compartment via the inside of the piston rod, and a part of the passageway. A shock absorber with an opening/closing orifice formed at an eccentric position relative to the J control rod and a shutter that is fixed to a control rod and opens/closes the opening/closing orifice by rotation of the control rod, has a built-in opening/closing orifice and a shutter. A shock absorber characterized in that the hollow body is formed into a hollow body, and the hollow body is fixed to a piston rond by specifying the same direction position of the opening/closing orifice by means of positioning means in the rotational direction with the control rod as the center of rotation. So, ba. (2) The shock absorber according to claim 1, wherein the positioning means is constituted by a male screw formed on the outer periphery of the piston rod and a plurality of nuts screwed into the male screw. (3) The positioning means is constituted by a male thread formed on the outer periphery of the piston rod and two nuts screwed onto this male thread, and one of the nuts and a hollow body are integrally formed, and this hollow body is integrally formed. 2. The shock absorber according to claim 1, wherein the piston is clamped and fixed between the nut and the other nut.