JPH047389Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hydraulic shock absorber equipped with an adjustment mechanism for adjusting damping force.

[Problems to be Solved by the Invention] When adjusting the damping force of a hydraulic shock absorber installed in a vehicle according to driving conditions and road conditions, a damping force adjustment mechanism is provided in the hydraulic shock absorber. This damping force adjustment mechanism includes an adjustment member that adjusts the opening degree of the oil passage;
It consists of a drive device that performs adjustment operations on this adjustment member, a power supply circuit that supplies drive power to this drive device, and a display device that displays the adjustment state. As a result of the current continuing to flow through parts that form part of the drive device, there was a risk that the parts would burn out due to the heat generated. Furthermore, the conventional configuration has the drawback of being expensive in terms of cost when displaying an abnormal state.

This invention was made in view of the above points,
The object thereof is to provide a hydraulic shock absorber which has an inexpensive abnormality display circuit and which can effectively protect components from burnout due to current heating even if an abnormality occurs in the adjustment operation.

[Means for Solving the Problems] According to the present invention, the object is to provide a hydraulic shock absorber body and a damping force adjusting member for adjusting the opening degree of a liquid passage of a damping force generating mechanism of the hydraulic shock absorber body. , a rotor connected to the damping force adjusting member and rotatably provided on the base; and a rotor for exciting the rotor.
An excitation coil provided on the rotor, a magnetic pole member provided on the base surrounding the rotor, and a magnetic pole member provided on the rotor electrically connected to each end of the coil and an intermediate tap. 1, a second contact, and a third contact, when set in the first position by rotation of the rotor in the first direction, contact the first contact and rotate the rotor in the first direction. The base is provided in correspondence with the first contact so that when it is rotated in a second direction opposite to the second position and set in the second position, it is not in contact with the first contact. a fourth contactor which is attached to the rotor;
is not in contact with the contactor of the rotor, and when the rotor is rotated in the second direction and is set to the second position, the contactor corresponding to the second contactor is in contact with the second contactor. A fifth contact provided on the base and a third contact so as to contact the third contact during rotation of the rotor over the entire range between the first position and the second position. a sixth contact provided on the base correspondingly; a thermistor having a positive temperature coefficient provided between the sixth contact and one terminal of the power supply; and the fourth and fifth contacts. A switch that selectively applies a voltage between a contact and a sixth contact, and a setting state of the rotor to the first and second positions by applying the voltage between the contacts of this switch. a first contact connected between the fourth contact and one terminal of the power source to indicate
This is achieved by a hydraulic shock absorber comprising a display device and a second display device connected between the fifth contact and one terminal of the power source.

[Specific Example] Next, the present invention will be explained in more detail based on a preferred specific example shown in the drawings.

In the figure, the inner tube 1 as a cylinder is the outer tube 2.
A cap 3 is fixed to one end of the inner cylinder 1 and outer cylinder 2, and a mounting ring 4 for mounting the hydraulic shock absorber 67 to an axle or the like is integrally connected to the cap 3. ing.

A piston 11 fitted into the inner cylinder 1 is connected to one end of the rod 7 so as to define the chamber 12 of the inner cylinder 1 into two oil chambers 13 and 14. piston 1
1 includes one-way valves 15 and 16 made of disk valves.
Passages 17 and 18 are provided which are opened and closed, respectively. The piston 11 is provided with a passage branching from the passage 17, that is, a fixed orifice, in order to keep the chambers 13 and 14 in constant communication.

The valve 15 opens when the hydraulic pressure in the chamber 14 becomes larger than a certain value with respect to the hydraulic pressure in the chamber 13.
The oil liquid is allowed to flow from the chamber 4 to the chamber 13 through the passage 17, and when the value becomes smaller than a certain value, the valve is closed and the oil liquid is prevented from flowing from the chamber 14 to the chamber 13 through the passage 17.

The valve 16 opens when the hydraulic pressure in the chamber 13 is higher than a certain value compared to the hydraulic pressure in the chamber 14, and closes when the hydraulic pressure is lower than the hydraulic pressure in the chamber 14, and performs the opposite action to the valve 15. .

An annular chamber 2 defined by an inner cylinder 1 and an outer cylinder 2
1 communicates with a chamber 14 through a through hole 22 bored at one end of the inner cylinder 1, and chambers 21, 13, and 14 contain oil, and an inert gas is placed above the chamber 21. Pressurized gas is enclosed.

The rod 7 is provided with a through hole 23 extending in the longitudinal direction from the upper end to the lower end of the rod 7.
A connecting rod 24 extends rotatably within the through hole 23 . The rod 7 also has a through hole 23 and a chamber 13.
A radial through hole 25 is provided that communicates with the. A cylindrical body 26 is screwed onto the lower end of the rod 7. The through holes 23 and 25 constitute an oil passage.

A shutter 29 serving as an opening adjustment member is attached to one end of the connecting rod 24 and is rotatably held within the cylindrical body 26 . On the side wall of the cylindrical body 26,
Holes 31 and 32 of different diameters are bored,
When the shutter 29 is rotated within the cylindrical body 26 through the connecting rod 24, the holes 31 and 32 serving as orifices are selectively opened and closed through the hole 34 of the shutter 29. The holes 31 and 32 are formed in the cylinder 2 at an angle of approximately 60 degrees.
It is provided on the side wall of 6. The diameter of hole 32 is hole 3
It is larger than the diameter of 1. The hole 34 of the shutter 29 extends through the side wall of the shutter 29 with a predetermined width, and the width is set to be smaller than the distance between the holes 31 and 32 and larger than the diameter of the hole 32. The shutter 29 is urged upward by a spring (not shown). Shyatsuta 29
In addition to the hole 34, a hole 36 is formed with a sufficiently larger passage cross-sectional area than the hole 32.
The hole 23 and the hole 31 or 32 communicate with each other through the holes 4 and 36. It is attached to the vehicle body via a mounting mechanism on one end of the rod 7 located at the lower part of the inner cylinder 1. An O-ring is arranged at the upper end of the hole 23 to prevent leakage of oil from the hole 23. Rod 7
A connecting rod 24 is attached to the upper end of the shutter 29.
A case 40 of a rotary solenoid that rotates the rotary solenoid is attached to the case 40, and a shaft 41 is attached to the case 40. A rotor 43 made of a laminated iron core is provided on the shaft 41 via a bearing 42 so as to be freely rotatable in the A direction and the opposite direction B direction, and the rotor 43 is provided with a coil 44. There is. The contactor mounting member 44a, which is attached to the rotor 43 and rotates together with the rotor 43, has a contactor 4 attached thereto.
5, 46 and 47 are attached, one end 48 of the coil 44 is attached to the contact 45, the other end 49 of the coil 44 is attached to the contact 46, and the middle of the coil 44 is attached to the contact 47. The taps 50 are electrically connected to each other. The mounting member 44a is formed from an electrically insulating member. The rotor 43 is provided with a protrusion 51 as an abutting member, and the protrusion 51 covered with an elastic body such as rubber is positioned at a rotational position 52.
When it is rotated to the rotation position 54, it comes into contact with a protrusion 53 as a contact member attached to the case 40, and the rotation position 54 is rotated.
When it is rotated, it comes into contact with a protrusion 55 which is also attached to the case 40 and serves as an abutting member. When the protrusion 51 abuts the protrusion 53 during rotation from position 54 to position 52 in the B direction as the second direction, further rotation of the rotor 43 is prevented;
When the protrusion 51 abuts the protrusion 55 during rotation in direction A as the first direction from position 54 to position 54, further rotation of the rotor 43 is blocked. case 4
Magnetic pole members 56 and 57 made of permanent magnets are provided facing each other on the inner surface of the peripheral wall of the rotor 43. It is formed to have an S pole. The electrically insulating member attached to the case 40 includes a contact 45 as a second contact and a contact 4 as a first contact.
6. Corresponding to the contact 47 as the third contact, a contact 59 as the fifth contact made of a conductive thin plate, a contact 60 as the fourth contact, and a sixth contact A contactor 61 is provided as a contactor 61, and the contactor 59 does not come into contact with the contactor 45 when the protrusion 51 is placed at the position 54, and comes into contact with the contactor 45 in other cases. To,
The contactor 60 extends in the rotational direction of the rotor 43, and when the protrusion 51 is placed at the position 52, the contactor 60 is out of contact with the contactor 46, and in other cases, the contactor 60 is in contact with the contactor 46. The contactor 61 extends in the rotational direction of the rotor 43 so as to be in constant contact with the contactor 47 between positions 52 and 54. ing.
The contacts 45, 46 and 47 are respectively connected to the contacts 59,
In order to ensure contact with contacts 60 and 61, they are pressed in the direction of contacts 59, 60 and 61 by springs (not shown). The contacts 59, 60, and 61 are connected to a switch 65 and a power source 66 via a cable 64, and the switch 65 is provided, for example, on an operation panel of the driver's seat of the vehicle to which the hydraulic shock absorber main body 67 is attached. Between one terminal 84 of the switch 65 and the negative side of the power supply 66, a light emitting diode 70 and a diode 7 are connected as a second display device.
A circuit consisting of 4 and a resistor 71 is connected,
A circuit consisting of a light emitting diode 72 as a first display device, a diode 75 and a resistor 73 is connected between the other terminal 83 of the switch 65 and the negative side of the power source 66. In the display device, light emitting diodes 70 and 72
Similar to the switch 65, the hydraulic shock absorber main body 67 is provided on the operation panel of the driver's seat of the vehicle to which the hydraulic shock absorber main body 67 is attached, so that the driver can visually see it. Further, a PTC thermistor 76 having a positive temperature coefficient as shown in FIG. 5 is connected between the contact 61 and the negative side of the electrode 66. In addition, cable 8
Rotary solenoids 68 similar to those shown in FIG. 1 are also connected to terminals 0, 81, and 82.

Rotary solenoid 68 configured in this way
In a hydraulic shock absorber consisting of a hydraulic shock absorber main body 67, etc., the switch 65 is connected to the contactor 6 as shown in FIG.
The voltage of the power supply 66 is applied between 0 and 61, and the contact 5
9 and 61, the rotor 43 is set as shown in FIG. 1, and the hole 34 is located at the position of the hole 31. The chambers 13 and 14 have holes 25, 23,
36, 34, and 31, and the hydraulic shock absorber main body 67 is defined by the fixed orifice formed in the piston 11, the valve 16, and the hole 31 on the extension side, that is, when the piston 11 moves in the G direction. Produces a damping force. Since the diameter of the hole 31 is smaller than that of the hole 32, a hard damping force can be obtained in this case. On the contraction side, that is, when the piston 11 moves in the H direction, a similarly hard damping force, in other words, a large damping force, is obtained. Also, in this state,
Since the voltage of the battery 66 is loaded across the series circuit consisting of the diode 72 and the resistor 73, a current flows through the diode 72 and the diode 72 emits light, while a current flows through the diode 70 and does not light up. Therefore, the lighting of the diode 72 indicates that the rotor 43 is set to the position 52, that is, it indicates that the hydraulic shock absorber main body 67 is set to produce a hard damping force. On the other hand, when the switch 65 is set opposite to the state shown in FIG. 2, in other words, the switch 65 applies the voltage of the power supply 66 between the contacts 59 and 61
When the voltage of the power source 66 is set not to be applied between the contacts 60 and 61, the power source 66 supplies a current to the power source 66, the contacts 59, 45, the end 48, the coil 44, the end 50, the contact 47. , 61, the thermistor 76, and the power source 66. As a result, the rotor 43
is excited and rotated in the direction A so that the protrusion 51 moves from position 52 to position 54. At the beginning of this rotation, the contacts 46 and 60 come into contact, and a little before the protrusion 51 comes into contact with the protrusion 55,
When the contact between the contact 45 and the contact 59 is released, that is, when the contacts 45 and 59 are out of contact, the supply of current to the coil 44 is interrupted and the rotor 43 is de-energized. After becoming de-energized, the rotor 43 is slightly rotated in the same direction due to inertia, and the protrusion 5 of the protrusion 51
5, the rotor 43 is stopped. This rotation of the rotor 43 also rotates the connecting rod 24 in the same direction, and the rotation of the connecting rod 24 also rotates the shutter 29. When the rotor 43 stops due to contact with the protrusion 55, the hole 34 is connected to the hole 32. Chamber 1 is set to the position of
3 and 14 are holes 25, 23, 36, 34 and 32
The hydraulic shock absorber main body 67 generates a soft damping force, in other words, a small damping force, as compared to the above case, by the movement of the piston 11 on the extension side and the contraction side. When the switch 65 is turned to obtain such a soft damping force, the voltage of the power supply 66 is applied across the circuit consisting of the diode 70 and the resistor 71.
A current flows through the diode 70 and the diode 70 emits light, but no current flows through the diode 72 and the diode 72 does not emit light. Therefore, the light emission of the diode 70 indicates that the rotor 43 is set to the position 54, that is, it indicates that the hydraulic shock absorber body 67 is set to produce a soft damping force. In order to obtain a hard damping force again, the switch should be set to the state shown in FIG. The reverse is true, and the protrusion 51 moves from position 54 to position 52.
As the contactors 46 and 60 come out of contact slightly before the protrusion 51 comes into contact with the protrusion 53, the current to the coil 44 is automatically cut off.

Note that the current flowing through the diodes 70 and 72 for light emission is regulated by resistors 71 and 73 so that the rotor 43 is not rotated by the current. Further, diodes 74 and 75 are provided to prevent the light emitting diodes 70 and 72 serving as a display device from being destroyed by application of a reverse bias. By the way, when normal operation is performed as described above, the contacts 45 and 59 are finally brought out of contact and no current flows through the coil. However, if the control to the stop position 54 is not possible due to some inconvenience during the rotation, the contacts 45 and 59 will not come out of contact and will continue to be in contact, resulting in the power source 66 and the contacts 59, 4
5, end 48, coil 44, end 50, contact 4
7, 61, the thermistor 76, and the power supply 66, current continues to flow. If the thermistor 76 is not provided, the continuing current will cause the coil 4 to
4 may generate heat and burn out. However, as shown in FIG. 5, the resistance of the thermistor 76, which has a sudden resistance change characteristic, changes rapidly due to self-heating.
9, 45, coil 44, end 50, contact 47,
61, the current flowing through the thermistor 76 is reduced, and therefore burning out of the coil 44 can be avoided. At this time, since the resistance of the thermistor 76 is increasing, the terminal voltage thereof is increasing. Due to this high terminal voltage, the contacts 47, 61 and the coil 4
4. Current flows through the circuit including the end portion 49, the contacts 46 and 60, the diode 72, and the resistor 73, thereby lighting the light emitting diode 72. Here, since the light emitting diode 70 is selected by the switch 65, it is lit from the time the switch is switched.
In this way, by lighting both the light emitting diodes 70 and 72, it becomes possible to display an abnormality indicating that the rotor has not rotated to the predetermined stop position 54 but has stopped halfway. Also, when the rotor 43 does not rotate to the predetermined stop position 52 and stops midway when switching from hard damping force to soft damping force, both diodes 70 and 72 light up in the same way. By doing so, it becomes possible to display an abnormality.

6, 7, and 8 show examples in which the present invention is applied to air spring adjustment. A main chamber 88 is provided in the upper part of the hydraulic shock absorber 67, and the main chamber 88 is connected to the adjustment part 87 via a pipe 90, and a rotary actuator 68 is provided in the upper part of the main chamber 88. Therefore, main room 88 and sub-room 8
5 through a pipe 90 to change the volume of the main chamber 88 and control the vehicle height. FIG. 7 shows a state in which the main chamber 88 and the sub-chamber 85 are closed, and FIG. 8 shows a state in which the main chamber 88 and the sub-chamber 85 are in communication. By providing the rotary actuator 68 with a display device and a thermistor according to the present invention, it becomes possible to confirm the adjustment position and indicate an abnormality. In the specific example described above, a light emitting diode was used as the display element of the display device, but the present invention is not limited thereto, and a general incandescent lamp may be used.

[Effects of the invention] As described above, according to the invention, since a display device and a thermistor are provided to display the adjustment status, abnormality can be displayed at low cost, and even if an abnormality occurs in the adjustment operation, parts of the device can be removed. can be effectively protected from heating by electric current.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the bottom side of a preferred embodiment of the present invention, Fig. 2 is an electric circuit diagram of the embodiment shown in Fig. 1, and Fig. 3 is the main body of the hydraulic shock absorber of the embodiment shown in Fig. 1. 4 is a cross-sectional view taken along the line shown in FIG. 3, FIG. 5 is a characteristic curve diagram of the thermistor, and FIG.
7 and 8 are explanatory diagrams of the case where the hydraulic shock absorber of the present invention is applied to air spring adjustment. 43...Rotor, 44...Coil, 45,4
6, 47, 59, 60, 61...contact, 51,
55... Protrusion, 53... Thermistor, 56, 57
...Magnetic pole member, 65...Switch, 70, 72...
...Light emitting diode, 85...Sub-chamber, 88...Main room.

Claims (1)

[Scope of utility model registration request] A hydraulic shock absorber main body, a damping force adjustment member that adjusts the opening degree of a liquid passage of a damping force generation mechanism of the hydraulic shock absorber main body, and a damping force adjustment member connected to the damping force adjustment member,
A rotor rotatably provided on a base; an excitation coil provided on the rotor to excite the rotor; a magnetic pole member provided on the base surrounding the rotor; and both ends of the coil. first, second and third contacts provided on the rotor and electrically connected to each of the contacts and the intermediate tap, respectively, and set in a first position upon rotation of the rotor in a first direction; When the first
so that when the rotor is rotated in a second direction opposite to the first direction of the rotor and set in the second position, it is not in contact with the first contactor. 1st
a fourth contact provided on the base corresponding to the contact of the rotor; and a fourth contact provided on the base corresponding to the contact of , and when the rotor is rotated in the second direction and set to the second position, it is provided on the base corresponding to the second contact so that it comes into contact with the second contact. a fifth contact and a base corresponding to the third contact so that the rotor contacts the third contact during the entire rotation of the rotor between the first position and the second position; a thermistor having a positive temperature coefficient provided between the sixth contact and one terminal of the power supply; a switch that selectively applies voltage between the contacts;
A connection is made between the fourth contact and one terminal of the power supply to indicate the setting of the rotor to the first and second positions by application of a voltage between the contacts of the switch. A hydraulic shock absorber, comprising: a first display device that is connected to the fifth contactor and a second display device that is connected between the fifth contact and one terminal of the power source.