JPH0329628Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The invention is a device that adjusts the damping force of a hydraulic shock absorber stepwise, and in particular, a device that prevents overrun of the drive source in an adjustment member that adjusts the damping force. The present invention relates to a hydraulic shock absorber having a braking circuit, that is, a short brake circuit.

[Problems to be solved by the invention] Conventionally, hydraulic shock absorbers are equipped with a position detector on the output shaft of the actuator, and the position signal is compared with a selected position signal obtained by exchanging the signal from the changeover switch. The adjustment member is started and stopped while confirming the control position based on the match or mismatch. When stopping the adjustment member, the drive source is braked using a transistor shot brake circuit or the like to shorten the control distance to prevent the member from overrunning and to position the member. There is. However, this short brake 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 drive device with a short brake circuit that is simple in structure and relatively inexpensive, which enables more accurate positioning of the adjusting member. The purpose of this invention is to provide a hydraulic shock absorber.

[Means for Solving the Problems] According to the present invention, the object is to adjust the damping force of the hydraulic shock absorber body and the damping force generation mechanism of the hydraulic shock absorber body. a damping force adjusting member rotatably provided in the damping force adjusting member; a motor connected to the damping force adjusting member to rotate the damping force adjusting member; and a power source having one end electrically connected to one terminal of the motor. and a conductive encoder plate mounted to rotate in accordance with the rotation of the damping force adjustment member, and electrically connected to the other terminal of the motor, regardless of the rotation angle of the encoder plate. a first brush that is always in electrical contact with the encoder plate; and a first brush that is connected to the other end of the power source via a first switch, and selectively contacts the encoder plate depending on the rotation angle of the encoder plate. a second brush in contact with the encoder plate; and a third brush connected to one terminal of the motor via a second switch and selectively in contact with the encoder plate depending on the rotation angle of the encoder plate. The shape of the encoder plate is such that one of the second brush and the third brush contacts the encoder plate at any rotation angle of the encoder plate, and the second brush and the third brush contact the encoder plate at any rotation angle of the encoder plate. The other side of the brush is formed so as not to contact the encoder plate, and the second switch is closed by the current flowing when the first switch is closed, and when the first switch is opened. This is accomplished by a hydraulic damper consisting of an electrical switch element that opens when the switch is activated.

[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 13,1
A passage branching off from the passage 17, that is, a fixed orifice, is provided to keep the passage 4 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 connects the through hole 23 and 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 serving as a damping force adjusting member is attached to one end of the connecting rod 24 and is rotatably held within the cylinder 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 connecting rod 24 is attached to the upper end of the rod 7, and therefore a connecting rod 24 is connected to the shutter 2.
A case 40 of a drive device 39 that rotates the motor 9 is attached to the case 40, and a DC motor 51 is attached to the case 40. A gear 52 is fixed to the output shaft of the motor 51, and the gear 52 meshes with a gear 54 fixed to a shaft 53. The combination of the gear 52 and the gear 54 causes the output shaft of the motor 51 to The rotation is transmitted to the shaft 53 at a reduced speed. case 4
The shaft 5 is connected to the substrate 55 supported by the shaft 5 through the bearing 56.
3 is rotatably held, and the shaft 53 and the connecting rod 2 are connected so that the rotation of the shaft 53 is transmitted to the connecting rod 24.
4 is connected. A conductive encoder plate 58 having a recess 57 is fixed to the shaft 53, and the brush mounting plate 5 faces the encoder plate 58.
9 is supported by the case 40, and the mounting plate 59 is provided with brushes 60, 61, and 62 as second brushes at an angular interval of about 120° in the circumferential direction. 60, 61, and 62 are in electrical contact with the encoder plate 58 unless they face the recess 57.
Further, the inside of the encoder plate 58 is punched out in a shape concentric with the outer periphery having the 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 as third brushes are arranged inside the encoder plate 58, and their positions are similar to those of the brushes 60, 61, 62.
It is set on the radially inner side of the encoder plate 58 corresponding to 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, the brush 62 corresponds to the brush 102, and the brush 61 corresponds to the brush 103. or,
The brush 101 is a relay 1 as a second switch.
04 to the power supply side, and similarly brush 1
02 is connected to a power source via a relay 105, and the brush 103 is connected to a power source via a relay 106. Furthermore, a brush 63 is provided on the mounting plate 59 so as to always be in electrical contact with the encoder plate 58 regardless of the position of the recess 57. A brush 63 as a first brush is electrically connected to one end of the motor 51, and the other end of the motor 51 is connected to fuses 64, 65.
It is electrically connected to one end of the DC power supply 66 via. Contacts 69, 70 and 71 and DC power supply 66
Display circuits each consisting of resistors 72, 73, 774 and light emitting diodes 75, 76, 77 are inserted between one end of the display circuit. 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 hydraulic shock absorber main body 78 is attached. 79,80,8
1 is a diode for inhibiting reverse current. Switch 67 constitutes a first switch, and relay 1
04, 105, and 106 constitute a second switch.

In the damping force adjustment mechanism configured in this way, when the switch 65 is turned on and the fixed contact 68 of the switch 67 as the first switch is connected to the contact 69, the convex portion 110 and the brush 101 come into contact. However, 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 2
4 and shutter 29 remain stopped, hole 34 coincides with hole 30 and chambers 13 and 14 coincide with hole 2.
5, 23, 36, 34 and 30, and the hydraulic shock absorber main body 78 is connected to the main body 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 convex portion 110 and the brush 101 are in contact with each other, a short brake circuit is formed via the closed relay 104. Further, in this state, current flows only through the diode 75, so that only the diode 75 emits light, and therefore, the hydraulic shock absorber main body 78 is set to produce the hardest damping force by the lighting of the diode 75. can be confirmed.

Next, when the switch 67 is operated so that the fixed contact 68 comes into contact with the contact 71, the current of the power supply 66 is transferred to the motor 51, the brush 63, the encoder plate 58,
Because of the flow through brush 62, motor 51 is actuated to rotate gears 52 and 54, causing gear 5 to rotate.
4 rotates the encoder plate 58, and when this rotation sets the recess 57 to a position facing the brush 62, the encoder plate 58 and the brush 62 become non-contact, and the current from the power source 66 to the motor 51 is reduced. The supply is interrupted and the motor 51 is deactivated. At this time, the convex portion 110 and the brush 102 come into contact, forming a short brake circuit via the closed relay 105. As the gear 54 rotates, the shutter 29 also rotates, and due to the arrangement of the recess 57 to the brush 62, the hole 34 is set to face the hole 31, and the chambers 13 and 14 are connected to the holes 25, 23, 36, 3.
4 and 31, and the hydraulic shock absorber main body 7
8, since the hole 31 has a larger diameter than the hole 30, an intermediate damping force is generated by the movement of the piston 11 in the F direction and the G direction.

In such an operation, when the recess 57 is set to a position facing the brush 62 as described above, the power supply to the motor 51 is stopped, and the motor 51 is stopped. Without the short brake circuit, even if the power supply to the motor 51 is stopped, the motor 51 will continue to rotate. Then, the inertial energy of the motor 51 is converted into frictional energy such as friction, and the motor 51 is stopped. However, immediately after the power supply to the motor 51 is stopped, the convex portion 110 of the encoder plate comes into contact with the brush 102, and conduction is established to the power supply section via the relay 105, forming a short brake circuit. The generated back electromotive force causes a current to flow in the opposite direction to the motor 51, thereby generating a force that causes the motor 51 to stop.
As a result, the vehicle can be stopped more quickly and reliably than without a short brake 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 via the brush 62, the encoder plate 58, and the brush 63.
rotates. The motor 51 continues to rotate, but when the recess 57 is set to a position opposing the brush 62, the encoder plate 58 and the brush 62 come out of contact, and the supply of current from the power source 66 to the motor 51 is stopped. is made inactive. or,
The convex portion 110 and the brush 102 come into contact, and the relay 1
Since 05 is conductive, a short brake circuit is formed. In this case, due to the back electromotive force generated within the motor 51, the circuit formed by the motor 51 and the relay 105 causes the motor 5 to
A current flows in the opposite direction in the motor 51, creating a force that causes the motor 51 to stop. Other operations are specific example 1
It is similar to

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 shot brake circuit, and the inner part controls conduction and non-conduction between the motor 51 and the power source. The operation in that case is concrete examples 1 and 2.
It is similar to

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 short brake 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 fixed contact 68 comes into contact with the contact 71, the encoder plate 5
8 and the brush 62 are in a non-contact state, and then the brush 102 and the brush 63 are in contact and are in a conductive state, and are connected to a power supply section via a relay 105 to form a short brake circuit. Also, throughout the specific examples, the operations in the other three systems are similar,
Items having the same functions are designated by the same numbers, and a code is added after the number to distinguish them from the described system, such as 51A, 51B, and 51C.

[Effect of the invention] As described above, according to the invention, when the first switch is closed and the encoder plate is rotated until the second brush no longer contacts the encoder plate, the encoder plate and the third brush Because a short brake circuit is formed for the motor via the brush and the second switch, when the motor stops, the motor is braked by the motor's back electromotive force, preventing overrun of the damping force adjustment member. The accuracy of the position control can be improved.

[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,
60, 61, 62...second brush, 63...first brush, 67...first switch, 101,
102, 103...Third brush, 104, 10
5,106...Second switch (relay), 10
7,108,109...Diode.

Claims (1)

[Scope of utility model registration request] In order to adjust the damping force of a hydraulic shock absorber main body and a damping force generation mechanism of the hydraulic shock absorber main body, a damping force adjusting member rotatably provided within the hydraulic shock absorber main body and the damping force adjusting member are rotated. a motor connected to the damping force adjusting member to increase the damping force, a power supply having one end electrically connected to one terminal of the motor, and a conductive motor attached to rotate in accordance with rotation of the damping force adjusting member. a first brush electrically connected to the other terminal of the motor and always in electrical contact with the encoder plate regardless of the rotation angle of the encoder plate; a second brush connected to one end of the motor via a first switch and selectively contacts the encoder plate according to the rotation angle of the encoder plate; and a second switch connected to one terminal of the motor. and a third brush that is connected to the third brush through the encoder plate and selectively contacts the encoder plate according to the rotation angle of the encoder plate, and the shape of the encoder plate is such that the shape of the encoder plate is set to One of the second brush and the third brush is formed so as to be in contact with the encoder plate, and the other of the second brush and the third brush is not in contact with the encoder plate;
A hydraulic shock absorber comprising an electric switch element, wherein the switch is closed by a current flowing when the first switch is closed, and is opened when the first switch is opened.