JPH0280829A - Solenoid housing type damper - Google Patents

Abstract

PURPOSE:To strengthen the suction force of a valve and increase the generating damping force of a damper by providing a magnetic material forming a sub- magnetic path on the outside of a hollow piston rod which forms the magnetic path of a solenoid. CONSTITUTION:A spacer 24 of a magnetic material forming a sub-magnetic path is interposedly held on the outside of a piston rod 11. A solenoid 15 attracts a valve body 17 to a valve seat 18, with a valve case 21, the valve seat 18, valve body 17, piston rod 11 and a washer 22 which are formed with a magnetic material as a magnetic path. In this case, the narrowed sectional area of the magnetic path of the piston rod 11 is compensated by forming a port 19. Thus, the valve body 17 is strongly attracted toward the valve seat 18 increasing the generating damping force of a damper.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a solenoid-incorporated damper in which the damping force generated is variable by incorporating a tension maid.

(Prior Art) Regarding a damper with a built-in solenoid that changes the generated damping force based on external energization, many proposals have been made in the past, and the present applicant first filed Japanese Patent Application No. 63-69071.
One example of this is the two-wheeled vehicle Front 7 Oak, which we proposed as a model number.

As shown in FIG. 3, the inner tube 2 is slidably inserted inside the outer tube 1, and the inner tube 2 is inserted into the damper cylinder 3, which is installed upright inside the outer tube 1, via the piston rod 11. At the bottom of the damper cylinder 3, hydraulic oil in the oil reservoir chamber 6 of the -L section of the inner tube 2 is transferred to a passage 7 with an annular cross section on the outside of the damper cylinder 3. through piston 4
The piston 4 is provided with a valve 8 that allows the oil to flow from the oil chamber 5 to the oil chamber 1 above the piston 4.
] A check valve 10 is provided to allow hydraulic oil to flow into the tank. The piston rod 11 has a hollow shape of 7 m3, and the hollow portion 12 and the oil chamber 5 communicate with each other via an orifice 32 at the lower end of the piston rod 11, and the hollow portion 12 and the oil chamber 9 communicate with each other via a boat 14. ing.

A boat 19 that communicates the hollow portion 12 with the outside of the piston rod 11 is formed in a portion of the piston rod 11, and a solenoid valve 13 shown in FIG. provided.

The valve body 17 of this solenoid valve 13 has an oil reservoir chamber 6
It is elastically supported by a leaf spring 26 from the side. Further, the valve body 17 is made of a magnetic material, and the solenoid 15, which is excited by energization, is attracted to the valve seat 18 by the magnetic flux formed around it as shown by the arrow in FIG.

In the pressure side operation of the front 7 oak, as the inner tube 2 enters the outer tube 1, the piston 4 slides downward inside the damper cylinder 3, and the check valve 10 checks whether the hydraulic oil in the oil chamber 5 is contracting or not. Oil chamber 9 expanding through
At the same time, the hydraulic oil corresponding to the intrusion volume of the piston rod 11 flows out from the boat]5) to the outside of the piston rod 11 through the hollow part 12.
3 is pushed open and the oil flows into the oil reservoir chamber 6.

In addition, in the expansion side operation, an oil reservoir chamber 6 is added to the expanding oil chamber 5.
The hydraulic oil flows back through the passage 7 and the check valve 8 without resistance, while the hydraulic oil in the shrinking oil chamber 9 flows from the boat 14 through the hollow part 12, pushes open the solenoid valve 13, and flows into the oil reservoir chamber 6. Inflow.

Further, a portion of the hydraulic oil that has flowed out into the hollow portion 12 flows into the oil chamber 5 through the orifice 32.

In other words, in this 70-ton 7-oak, the hydraulic fluid flows into the solenoid valve 1 during expansion and pressure operation in either direction.
3 and flows into the oil reservoir chamber 6 from the hollow portion 12, the damping force on both sides of the expansion can be changed by controlling the energization of the solenoid 5 via the wiring 16. Further, by adjusting the opening degree of the orifice 32, only the rebound damping force can be adjusted.

(Problem to be solved by the invention) By the way, in this Freon 17 Oak 1 Coil, the magnetic flux of the excited thread/id 15 is formed via the piston rod 11, but in this case, as shown in FIG. The cross-sectional area of the magnetic path is small in the boat 19 part of No. 11, and the magnetic flux is constricted in this part, so the valve body 17
There was a problem in that it was difficult to apply strong suction force to. In order to ensure the cross-sectional area of the magnetic path, the wall thickness of the piston rod 11 may be increased, but this reduces the passage cross-sectional area of the hollow portion 12 and increases the pressure loss of the flowing hydraulic oil.

In order to solve these problems that occur in dampers with a built-in solenoid, the present invention provides a damper with a built-in solenoid that can exert a sufficient magnetic force on a valve via a hollow piston rod. With the goal.

(Means for Achieving the Object) The present invention includes a piston coupled to a hollow piston rod that is slidably housed in a damper cylinder, and an oil chamber inside the damper cylinder and an oil reservoir chamber provided outside the damper cylinder. A valve is interposed between this hollow part and the oil reservoir chamber to communicate with each other through a hollow part of the piston port/F, and to resist the flow of hydraulic oil according to the magnetic force of a solenoid with the piston rod as a magnetic path. In the solenoid built-in damper, a magnetic material is provided on the outside of the piston rod and forms a submagnetic path in parallel with at least a portion of the magnetic path of the piston rod.

(Function) Since the cross-sectional area of the magnetic path increases due to the formation of the sub-magnetic path, the Tsuremade can exert sufficient magnetic force on the valve. Furthermore, since the magnetic material constituting the auxiliary magnetic path is disposed outside the piston rod, it does not inhibit the flow of hydraulic oil in the hollow portion of the piston rod.

(Example) FIGS. 1 and 2 show an example in which the present invention is applied to a front 7 oak. Note that the configuration not shown in the drawings is the same as that of the conventional example, and therefore the description thereof will be omitted.

Fig. 1 shows the structure of the upper part of the inner tube 2 of the front 7 oak.A hollow piston rod 11 is supported at the center of the inner tube 2, and a solenoid valve 13 is provided on the outside of the piston rod 11. An oil reservoir chamber 6 is formed.

The piston rod 11 has a port 1 that communicates between the hollow part 12 and the sole valve Iζ valve 13! ] is formed.

The hollow portion 12 above the bow 119 is sealed by the core 25 .

The solenoid valve 13 is housed inside a valve case 21 made of a magnetic material that is screwed onto the upper end of the inner tube 2, and is mainly composed of a valve body 17, a valve seat 118, and a solenoid 15.

The valve body 17 is made of an annular magnetic material, and is seated from the oil reservoir chamber 6 side on a valve seat 18 fixed between the lower end of the valve case 21 and the piston rod 11 and urged by a leaf spring 26 .

The outer peripheral part of the valve seat 18 that contacts the valve case 21 and the inner peripheral part that contacts the piston rod 11 are made of magnetic material, and the intermediate part sandwiched between these parts is made of a non-magnetic material. The valve body 17 is seated on the valve seat 18 in contact with the outer circumferential portion and the inner circumferential portion thereof, and blocks the through hole 1.8A formed in the outer circumferential portion of the valve seat 18.

The thread/id 15 consists of a bobbin 2o of non-magnetic material attached to the outside of the piston rod 11 and a fill wound around the bobbin 2o, and is arranged at the top of the inner tube 2 above the valve seat 18. On the upper side of the bobbin 20, a magnetic washer 22 whose outer periphery is in contact with the valve case 21 is attached to a nut 23.
When the piston rod 11 is tightened, the wiring #X16 for energizing the solenoid 15 passes through this washer 22 and is guided upward. The piston rod 1 should be prevented from entering the piston rod 1 through seal rings 27 and 28.
1 and a non-magnetic phase stopper 2 that is in close contact with the valve case 21.
Blocked by 9.

A spacer 24 made of a magnetic material and forming an auxiliary magnetic path with respect to the piston rod 11 is sandwiched between the two stoppers and the inner peripheral portion of the valve seat 18 . The spacer 24 is formed into a cylindrical shape having an inner diameter larger than the outer diameter of the piston rod 11, covers the outside of the bow 19 of the piston rod 11 with a slight gap, and is fixed to the upper end [also a one-shaft made of magnetic material]. A port 31 is formed in the seven-piston rod dozer 24 at a position rotated relative to the port 19, as shown in FIG.

Next, the effect will be explained.

In both the extension side operation and the compression side operation of the front 7 oak, hydraulic oil flows into the oil reservoir chamber 6 from the mouth hollow part 12 as in the conventional example, and a solenoid valve 13 interposed in the middle controls this operation. For oil flow, leaf spring 2
6 is the valve body] The elastic supporting force exerted on the valve body 7 and the excited solenoid 15 apply resistance due to the magnetic force exerted on the valve body 17 to generate a damping force.

By the way, the solenoid 15, which is excited by energization through the wiring 16, includes a valve case 21 made of a magnetic material, a valve seat 18, a pal '7' main body 17, as shown in the figure.
The valve body 17 is attracted to the valve seat 18 in order to form a magnetic flux using the piston rod 11 and the washer 22 as a magnetic path. In this case, the magnetic spacer 24 that covers the outside of the port 19 forms a sub-magnetic path for the piston rod 1 to compensate for the magnetic path cross-sectional area of the piston rod 11 that has been narrowed due to the formation of the port 19. . Therefore, the formation of magnetic flux is not hindered, and the valve body 17 is strongly attracted toward the valve seat 18, generating a sufficient damping force. Therefore, the generated damping force can be adjusted over a wide range by controlling the current supply to the thread/id 15. Also,
Since the spacer 24 is provided on the outside of the piston rod 11, there is no fear that it will interfere with the flow of hydraulic oil in the hollow portion 12.

In addition, since the port 31 is formed at a rotational position relative to the port 19, even if hydraulic oil is spouted outward from one port during high-speed operation, the spouted hydraulic oil will collide with the spacer 24 and then return to the port. 31 to the outside, and the flow of hydraulic oil is sufficiently rectified before the solenoid valve 13.

(Effects of the Invention) As described above, the present invention includes a magnetic material constituting a submagnetic path outside the hollow piston rod constituting the magnetic path of the excited solenoid. The hollow screw 1 is formed via the auxiliary magnetic path.
Even if the necessary cross section of the magnetic path cannot be secured by the connecting rod alone, the sub-magnetic path can compensate for this and exert sufficient attractive force on the valve. Therefore, the bow suction force of the valve can be strengthened and the damping force generated by goomba can be increased without interfering with the flow of hydraulic oil in the hollow portion of the piston rod.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the main part of the front 7 oak showing an embodiment of the present invention, and FIG. ttS2 is a view taken along the line I-A in FIG. 1. In addition, Fig. 3 is a vertical cross-sectional view of the front 7 oak showing a conventional example, Fig. 4 is a longitudinal cross-sectional view of the same enlarged main part, and Fig. 5 is a longitudinal cross-sectional view of the front 7 oak showing a conventional example.
It is a BB arrow directional view in a figure. 2... Inner tube, 6... Oil reservoir chamber, 11... Piston rod, 12... Hollow part, 13... Solenoid valve, 15... Solenoid, 17... Valve body, 18...・Valve seat, 21... Valve case, 24... Spacer. : Solenoid Figure 3 Figure 4

Claims (1)

[Claims] A piston coupled with a hollow piston rod is slidably housed in a damper cylinder, and an oil chamber in the damper cylinder and an oil reservoir chamber provided outside the damper cylinder are communicated through the hollow part of the piston rod. In a damper with a built-in solenoid, a valve with a built-in solenoid is interposed between the hollow part and an oil reservoir chamber to resist the flow of hydraulic oil according to the magnetic force of a solenoid whose magnetic path is a piston rod. A damper with a built-in solenoid characterized by having a magnetic material on the outside of a piston rod that is partially parallel to the magnetic material forming a submagnetic path.