JPH0444906Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for adjusting the damping force of a shock absorber in stages, particularly an adjusting member for adjusting the damping force, particularly a braking device for preventing overrun of a drive source. The present invention relates to a shock absorber having a circuit.

[Problems to be solved by the invention] Conventionally, damping force adjustment devices for shock absorbers have installed a position detector on the output shaft of the actuator, and compared this position signal with a selected position signal converted from a signal from a changeover switch. Then, depending on whether the signals match or do not match, the adjusting member is started or stopped while confirming the control position. When stopping the adjustment member, the drive source is braked by a transistor braking circuit or the like to shorten the control distance, thereby preventing overrun of the member and positioning the member. However, this braking circuit has a complicated structure and is expensive.

The present invention has been devised in view of the above points, and its purpose is to provide a shock absorber equipped with a drive device having a braking circuit that is simple in structure and relatively inexpensive, which enables more accurate positioning of the adjusting member. An object of the present invention is to provide a damping force adjusting device for an absorber.

[Means for Solving the Problems] According to the present invention, the object is to provide a shock absorber main body, a damping force adjusting member for adjusting the opening degree of a damping force generating mechanism of the shock absorber main body,
A drive device having a drive source connected to a damping force adjustment member to perform an adjustment operation, and an encoder plate that controls the operation and stop of the drive source and the stop position by connecting and disconnecting with a power supply circuit described below. , a power supply circuit in which a first switch for selecting the opening degree of the liquid passage of the damping force generation mechanism is connected to a power source, and selectively supplies driving power to the drive device in order to control the opening degree to the selected opening position; The drive device includes a second switch that mechanically interlocks with the first switch so as to form a braking circuit for the drive source via the encoder plate when the adjustment operation of the damping force adjustment member is completed. This is achieved by means of a shock absorber damping force adjustment device to which the shock absorber is connected.

[Specific Example] Next, the present invention will be further described in detail based on a specific example shown in the drawings. In the figure, an inner cylinder 1 as a cylinder is installed in an outer cylinder 2, a cap 3 is fixed to one end of the inner cylinder 1 and the outer cylinder 2, and a hydraulic shock absorber main body 78 is attached to the cap 3. A mounting ring 4 for mounting on a device or the like is integrally connected. A rod guide 5 and a cap 6 are fitted into the other ends of the inner cylinder 1 and the outer cylinder 2, respectively, and a piston rod 7 passes through the guide 5 and the cap 6 and extends upward. Inside the cap 6, there is a packing 8.
is provided to sealingly abut around the rod 7, and the packing 8 is pressed against the inner surface of the cap 6 and the outer peripheral surface of the rod 7 by a spring 10 via a retainer 9.

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. Furthermore, the piston 11 has chambers 13 and 14.
A passage branching off from the passage 17, that is, a fixed orifice, is provided in order to keep the passage 17 in constant communication. 19 is a washer, and 20 is a piston ring.

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, and allows the oil to flow from the chamber 14 to the chamber 13 through the passage 17. When the value becomes smaller than a certain value, the valve closes.
Oil fluid is prevented from flowing from chamber 14 to chamber 13 via 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 it is lower than the hydraulic pressure in the chamber 14.
and perform the opposite action.

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 is also provided with a radial through hole 25 that communicates the through hole 23 with the chamber 13. Furthermore, a cylindrical body 26 is screwed onto the lower end of the rod 7, and a lid 27 is screwed onto the lower end of the cylindrical body 26.

A shutter 29 as a damping force adjusting member is attached to one end of the connecting rod 24 and is rotatably held within the cylindrical body 26 . Holes 30, 31, and 32 of different diameters are bored in the side wall of the cylinder 26, and when the shutter 29 is rotated within the cylinder 26 through the connecting rod 24, the holes 34 of the shutter 29
holes 30, 31 and 3 as orifices through
2 are selectively opened and closed. Holes 30, 31 and 32
are provided on the side wall of the cylindrical body 26 at angular intervals of about 120 degrees. The diameters of the holes 30, 31, and 32 increase in the order of 30, 31, and 32.
The hole 34 of the shutter 29 extends the side wall of the shutter 29 by a predetermined width, and this width is the same as that of the holes 30 and 31.
and 32, and larger than the diameter of the hole 32. A spring 35 is disposed between the shutter 29 and the lid 27, and the spring 35 causes the shutter 2 to close.
9 is biased upward. In addition to the hole 34, the shutter 29 has a hole 36 formed with a sufficiently larger passage cross-sectional area than the hole 32, and the holes 34, 3
The hole 23 and the hole 30, 31 or 32 communicate with each other through the hole 6. The holes 23, 25, 34 and 36 constitute a liquid passage of the damping force generating mechanism of the hydraulic shock absorber main body. One end of the rod 7 located outside the inner cylinder 1 is attached to the vehicle body via an attachment mechanism 37. An O-ring 38 is arranged at the upper end of the hole 23 to prevent leakage of oil from the hole 23. A case 40 of a drive device 39 for rotating the connecting rod 24 and therefore the shutter 29 is attached to the upper end of the rod 7. The case 40 has a DC motor 5
1 is attached. A gear 52 is fixed to the output shaft of the motor 51.
It meshes with a gear 54 fixed to gear 5.
2 and the gear 54, the rotation of the output shaft of the motor 51 is transmitted to the shaft 53 at a reduced speed. The shaft 53 is rotatably held by a substrate 55 supported by the case 40 via a bearing 56, and the shaft 53 and the connecting rod 24 are connected so that the rotation of the shaft 53 is transmitted to the connecting rod 24. There is. The shaft 53 has a recess 57
A conductive encoder plate 58 is fixed thereto, and a brush mounting plate 59 is provided facing the encoder plate 58 and supported by the case 40.
Brushes 60, 61, and 62 are provided on the mounting plate 59 at an angular interval of about 120° in the circumferential direction. We are starting to come into contact with each other. Also, the encoder plate 58
The inside is punched out in the shape of a concentric circle with the outer periphery having a recess 57. A convex portion 110 is provided at a position opposite to the concave portion 57 . The length of the convex portion 110 along the rotation direction of the encoder plate 58 is shorter than the length of the concave portion 57 along the same direction. Also, brushes 101, 102, 103 are arranged inside the encoder plate 58, and their positions are similar to those of the brushes 60, 61,
62, and is set on the radially inner side of the encoder plate 58. When the brush 60 enters the recess on the outer periphery of the encoder plate 58, the protrusion 110 on the inner periphery comes into contact with the brush 101. Similarly, brush 62 is similar to brush 10.
2. The brush 61 corresponds to the brush 103. Further, the brush 101 is connected to the second switch 1 for switching.
The brush 102 is connected to the power supply side via the switching contact 104 of 00, and the brush 102 is connected to the switching contact 105 of
The brush 103 is connected to a power source via a switching contact 106. Furthermore, the mounting plate 59 has a recess 57.
A brush 63 is provided so as to always be in electrical contact with the encoder plate 58 regardless of its position.
The brush 63 is electrically connected to one end of the motor 51, and the other end of the motor 51 is connected to a DC power source 66 via a fuse 64, an ignition switch, etc.
electrically connected to one end of the Contacts 69, 7
Resistors 72, 73, 74 and light emitting diodes 75, 7 are connected between 0 and 71 and one end of the DC power supply 66, respectively.
A display circuit consisting of 6 and 77 is inserted.
The switches 65, 67 and the diodes 75, 76, 77 as display devices are attached to the operation panel of the driver's seat of the vehicle to which the shock absorber body is attached. 79, 80, and 81 are diodes for blocking backflow.

In the damping force adjustment mechanism configured in this way, the switch 65 is in the closed state, and the first switch 6
When the fixed contact 68 of No. 7 is connected to the contact 69, the switch 100 is also connected to the switching contact 104 in conjunction. Also, although the convex portion 110 and the brush 101 are in contact, the brush 60 and the encoder plate 58 are out of contact, and no current from the power source 66 flows to the motor 51, and the gears 52, 54, shaft 53, and connecting rod 24 and shutter 29 remain stopped, and hole 34
corresponds to hole 30, chambers 13 and 14 correspond to holes 25, 2
3, 36, 34 and 30, and the shock absorber 78 on the extension side
That is, by moving the piston 11 in the F direction, the piston 1
Fixed orifice formed in 1, valve 16 and hole 30
produces a damping force defined by Since the diameter of hole 30 is smaller than that of holes 31 and 32, the hardest damping force is obtained in this case. However, since the protrusion 110 and the brush 101 are in contact, one end of the motor 51 is electrically connected to GND via the switching contact 104 of the switching switch 100, and the motor 51
A braking circuit is formed that brakes the motor 51 by utilizing the back electromotive force generated in the motor 1. When stopped, there is no back electromotive force and both ends of the drive source are connected to GND.
Also, in this state, as a result of current flowing only through the diode 75, only the diode 75 emits light, so confirm that the main body 78 is set to produce the hardest damping force when the diode 75 lights up. sell.

Next, when the switch 67 is operated so that the fixed contact 68 comes into contact with the contact 71, the switch 100
also contacts the contact 105, and the current from the power source 66 flows through the brush 61, encoder plate 58, brush 63, and motor 5.
1, the motor 51 is actuated to rotate the gears 52 and 54, rotation of the gear 54 rotates the encoder plate 58, and this rotation sets the recess 57 in a position opposite the brush 61. The encoder plate 58 and the brush 61 come out of contact, the supply of current from the power source 66 to the motor 51 is interrupted, the motor 51 is made inactive, and the protrusion 110
and the brush 102 come into contact with each other. As the gear 54 rotates, the shutter 29 also rotates, and due to the arrangement of the recess 57 to the brush 61, the hole 34 is set to face the hole 31, and the chambers 13 and 14 are connected to the holes 25, 2.
3, 36, 34, and 31, and since the hole 31 of the shock absorber 78 has a larger diameter than the hole 30, the shock absorber 78 produces an intermediate damping force when the piston 11 moves in the F direction and the G direction.

In such an operation, as described above, when the recess 57 is set to a position opposing the brush 61, the power supply to the motor 51 is stopped, and the motor 51 is stopped. In this case, the motor 51, the switch 10
If there is no braking circuit that conducts to GND through 0,
Even if the power supply to the motor 51 is stopped, the motor 51 continues to rotate due to its inertia. Then, the inertial energy of the motor 51 is converted into frictional energy such as friction, and the motor 51 is stopped. However, motor 5
Immediately after the power supply to the motor 1 is stopped, the convex portion 110 of the encoder plate comes into contact with the brush 102, so one terminal of the motor 51 is connected to GND via the contact 105.
Since the motor 51 is electrically connected and a braking circuit is formed, the motor 51
Due to the back electromotive force generated in the motor 51, a current flows in the opposite direction to the motor 51, thereby generating a force that causes the motor 51 to stop. As a result, the motor 51 can be stopped more quickly and reliably than when there is no braking circuit.

FIG. 4 shows a second specific example of the present invention. When the fixed contact 68 is in contact with the contact 69, the encoder plate 58 and the brush 60 are out of contact and the motor 51 does not operate.

Next, when the switch 67 is operated so that the fixed contact 68 comes into contact with the contact 71, the current from the power source 66 is supplied to the motor 51, so that the motor 51 rotates. When the recess 57 is set to a position opposite the brush 62, the encoder plate 58 and the brush 62 are out of contact, and the supply of current from the power source 66 to the motor 51 is stopped, making the motor 51 inoperative. Further, since the convex portion 110 and the brush 102 are in contact and the switching contact 105 is electrically connected, a braking circuit is formed. In this case, due to the back electromotive force generated within the motor 51, the motor 51 and the switching contact 1
05, the motor 51
A current flows in the opposite direction, generating a force that causes the motor 51 to stop. Other operations are the same as in the first example.

FIG. 5 shows a third specific example of the present invention. The encoder plate 58 has an outer portion 201 and an inner portion 202.
It consists of two parts. The two parts are configured such that the outer part constitutes a braking circuit, and the inner part controls conduction and non-conduction between the motor 51 and the power source. The operation in that case is the same as in specific examples 1 and 2. In this case, 63 and 63' are connected.

FIG. 6 shows a fourth specific example of the present invention. In this specific example, the encoder plate has a donut shape, and brushes 10 are arranged on the same circumference on the outside.
1, 102, and 103 constitute a braking circuit, and the circuit arranged on the same inner circumference controls conduction and non-conduction between the motor 51 and the power source. The operation in that case is the same as in specific examples 1 and 2.

FIG. 7 shows a fifth specific example of the present invention. A single conductor plate is shown and has two annular cutouts. The outer notch has a notch 111 in which a portion of the ring is cut out so as to select one of the brushes 60, 62, and 61. In the inner ring concentric with the outer ring, when the brush 60 and the brush 63 become non-conductive, the brush 101 corresponding to the brush 60
contacts the conductor portion so as to be electrically connected to the brush 63;
In the other brushes 102 and 103, some conductors are left and others are cut out so that they are not electrically connected to the conductor portions. This notch is indicated by the number 112. In the encoder plate 58 configured in this way, the brush 60 and the brush 63 are located at the positions shown in the drawing.
Since there is no contact, the motor 51 does not rotate.

Next, when the switch 67 is operated so that the movable contact 68 comes into contact with the contact 71, the encoder plate 5
8 and the brush 62 are in a non-contact state, then the brush 102 and the brush 63 are in contact and are in a conductive state, and one end of the motor 51 is switched through the switching contact 105.
Connected to GND to form a braking circuit. Also, throughout the specific examples, the operations in the other three systems are similar, and those having the same functions are indicated by the same numbers.

[Effect of the invention] As described above, according to the invention, the encoder of the drive device is configured to form a braking circuit with respect to the drive source, so that when the motor is stopped, braking is performed by the back electromotive force of the motor. This prevents the damping force adjustment member from overrunning and improves the accuracy of its position control. Furthermore, it is possible to provide a device that is cheaper and easier to maintain than a special braking device.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram of a preferred example of the present invention, FIG. 2 is a cross-sectional view taken along the line shown in FIG. 1, FIG. 3 is an electric circuit diagram of the first example, and FIG.
The figure is an electric circuit diagram of the second specific example shown in FIG. 1, and FIGS. 5, 6, and 7 are plan views showing modified examples of the encoder plate according to the present invention. 29... Damping force adjustment member, 39... Drive device,
104, 105, 106...Switching contact, 107,
108, 109...Diode, 68...First switch, 100...Second switch.

Claims (1)

[Claims for Utility Model Registration] (1) A shock absorber body, a damping force adjustment member for adjusting the damping force of the damping force generation mechanism of the shock absorber body, and a damping force adjustment member connected to the damping force adjustment member for adjustment operation. a drive device having a drive source and an encoder plate that controls the stop position of the drive source by controlling the operation and stop of the drive source through conduction and disconnection with a power supply circuit described later; and a damping force generated by the damping force generation mechanism. a first switch is connected to a power source and includes a power supply circuit that selectively supplies driving power to a drive device in order to control the damping force adjustment member to a selected position; A second switch mechanically interlocked with the first switch is connected to form a braking circuit for the drive source via the encoder plate when the member adjustment operation is completed. Shock absorber damping force adjustment device. (2) The shock absorber damping force adjusting device according to claim 1, wherein a display circuit indicating the selected position of the damping force adjusting member is connected to the power supply circuit. (3) The shock according to claim 1 or 2, wherein the encoder plate is formed to constitute a circuit for controlling the damping force adjusting member to the selected position and a braking circuit for the drive source. Absorber damping force adjustment device. (4) The encoder plate is made of an annular conductive disk, and has a concave portion on the outer periphery in which the circuit that controls the selected position is non-conductive when selecting the damping force, and a concave portion on the inner periphery in which the circuit that controls the selected position is non-conductive. A damping force adjusting device for a shock absorber according to claim 1 or 2, which has a convex portion through which a braking circuit for braking a drive source is electrically conductive. (5) The encoder plate selects one brush on the outer circumference of two concentric circumferences connecting a plurality of brushes in contact with the encoder plate, and the encoder plate and the brushes are non-conductive. Registration of a utility model having one notch and another notch such that when the one brush is selected on the inner circumference, only the inner brush corresponding to the one brush is electrically connected to the encoder plate. A damping force adjustment device for a shock absorber according to claim 1.