JPS63265793A - Steering damper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of a steering damper for a motorcycle 111 or the like.

(Prior Art) For example, in a two-wheeled vehicle, a steering damper that absorbs vibrations transmitted from the 077 wheels to the steering wheel especially when driving on a rough road is configured as shown in Fig. 12.3. in this case,
The steering damper 1 includes a 70-ton oak 2, an upper bracket 4 that supports the steering wheel shaft 3, and a vehicle body 7 frame 5.
It is interposed between. The steering damper 1 has a piston 7 slidably housed in a cylinder 6, and oil chambers A and B are defined on both sides of the piston 7. A piston rod 8 connected to the piston 7 is slidably supported via bearings 9 and 10 at both ends of the cylinder 6, and one end is connected to the eye bracket 1.
1 to the upper bracket 4, and the cylinder 6 to the vehicle body frame 5 via the bellows 12 (bearing).

The piston 7 has a passage 13 that communicates the oil chambers A and B.
is provided, a part of which is formed in the orifice 14, so as to provide resistance to the oil passing through this passage 13 and generate a damping force.

(Problems to be solved by the invention) By the way, in such a steering damper,
In order to avoid a difference in the damping force between the two extension strokes, the piston rod 8 protrudes from both sides of the cylinder 6 due to pressure receiving area and oil volume fluctuations, that is, a double rod type is used.
In this case, the cylinder 6 must be installed at a certain distance C from Tsumugi [, that is, at an offset position, and therefore a bending moment always acts on the piston rod 8, etc., which causes an increase in 7 lixian and an excessive load. This causes buckling of the piston rod 8 due to /Iλ, and also causes a large difference in the damping force between the two extension strokes. This has a large effect when the damping force specification for the skin is high.

Furthermore, since the piston rod 8 protrudes from both sides of the cylinder 6, there is a problem in that a large installation space is required in the user's direction.

In order to solve these problems, the present invention aims to provide a steering gunba that uses a single-rod type in which the piston rod protrudes only from one side of the cylinder, but is configured so that there is no difference in damping force between both extension strokes. shall be.

(Means for solving the problem) This invention includes a piston that is slidably housed in a cylinder, oil chambers defined on both sides of the piston, and a piston rod connected to the piston that protrudes from one end of the cylinder. The oil chambers on both sides of the piston are connected via check valves that prevent the flow of hydraulic oil from the oil chamber on the piston rod side to the oil chamber on the opposite side. An oil sump chamber is provided to compensate for the accompanying oil volume fluctuations, and a mounting force is generated that generates a damping force by squeezing the hydraulic oil flowing toward the oil sump chamber through a passage that communicates this oil sump chamber with the oil chamber on the piston rod side. In addition, check valves for blocking the flow of hydraulic oil to the oil reservoir chamber are installed in the passages communicating with the oil reservoir chamber and the oil chamber on the opposite side, while the cross-sectional area of the piston rod is It is set to approximately 1/2 of the cross-sectional area.

(Function) During both extension strokes, the hydraulic oil in the cylinder is always regulated by the check valve to flow in one direction into the oil reservoir chamber through the annihilating force generating means, and the mounting force generating means controls the flow of this hydraulic oil. is squeezed to provide resistance and generate damping force. In this case, the pressure-receiving area of the piston is almost the same in both extension strokes, and the oil amount fluctuations in the cylinder due to changes in the volume entered by the piston rod are compensated for by the oil reservoir, so the damping force does not change in both extension strokes. There will be no difference. By the way, this steering damper is a single-rod type in which the piston rod protrudes only from one side of the cylinder, so the cylinder is installed on the axis, in the center of the bottom of the cylinder, so that almost no bending moment acts on the piston rod, etc. In addition to being able to be installed in the direction of the user, the installation space is also small due to the reduced dimensions in the user's direction.

(Example) In Fig. 1, 20 is a cylinder with a bottom, 21 is housed in the cylinder 20 so as to be able to slide freely, and oil chambers A and Bfe:I
A bison rod 22 connected to a piston 21 is slidably supported on one side of the cylinder 20 via a bearing 23.

A passage 24 that communicates oil chambers A and B is formed in the piston 21, and a reverse IL valve 25 is installed in this passage 24 to prevent backflow of hydraulic oil from oil chamber B on the piston rod 22 side to oil chamber A on the opposite side. Interpose.

On the outer periphery of the cylinder 21, a four-part space 28 with seven runs 26 and 27 at both ends is defined by an outer shell 29 made of an elastic material such as rubber, so that the piston rod 22 can be easily accommodated due to changes in the intrusion volume of the piston rod 22, oil temperature changes, etc. An oil reservoir chamber C is formed to compensate for fluctuations in oil amount within the cylinder 20.

In the passage 31 that communicates the oil sump chamber C and the oil chamber B of the piston rod 221+111, there is a pulp 30 that throttles the hydraulic oil flowing into the oil sump chamber C to apply resistance and generate a damping force.
, and a passage 32 that communicates the oil chamber A and the oil reservoir chamber C on the opposite side.
is a reverse one-way valve 3 that prevents the flow of hydraulic oil to the oil sump chamber C.
Interpose 3.

Therefore, the piston 21 is displaced to the left in the figure, and the oil chamber B
In the extension stroke where the oil chamber 13 contracts, the hydraulic oil in the oil chamber 13 passes through the rupture valve 30 and flows into the oil reservoir chamber C, while the expanding oil chamber A contains oil corresponding to the volume of piston movement from the oil reservoir chamber C. is replenished through the check valve 33. In addition, during the pressure stroke in which the oil chamber A contracts, the hydraulic oil in the oil chamber A flows into the oil chamber 13 through the check valve 25 as the piston 21 moves, and excess oil (the increased volume of the piston rod 22) flows into the oil chamber 13. Hydraulic oil) flows into the oil reservoir chamber C through the sterilized pulp 30.

In other words, in the expansion stroke, the oil in the cylinder 20 always flows in one direction, and the densification valve 30 opens and flows into the oil reservoir chamber C, and the densification pulp 30 provides resistance to the flow of this pressure oil. It is designed to generate damping force. In this case, the pressure receiving area of the piston 21 during the extension stroke is a, = Sc 5c
(Sc: piston cross-sectional area, SC: piston rod cross-sectional area), and the pressure receiving area of the piston 21 in the pressure stroke is a2=
Since Se, Se is set at a ratio of approximately 1:2 to Sc in order to equalize the pressure receiving areas a and a2 in the compression side stroke.

By the way, in this case, the rupture valve 30 is connected to the bearing 1 (
) etc. Case containing electromagnetic brake/id 35: (
When the electromagnetic solenoid (5) is excited, it is attracted to the seat part 37 according to the excitation force and increases the initial opening pressure of the valve.
The excitation current of the electromagnetic solenoid 35 is controlled via a control circuit (not shown) so that, for example, the excitation force is strengthened in accordance with the rise of the single series, thereby increasing the resistance force of the fluid by the demounting valve 30.

Therefore, in the expansion stroke, the oil in the cylinder 20 is always regulated to flow in one direction into the oil reservoir chamber C through the damping valve 30 by the check valves 31 and 33 as described above, and the reducing valve 30 controls the flow of this oil. This creates resistance to the flow and generates a damping force. In this case, the pressure receiving area of the piston 21 is approximately equal in the expansion stroke, and the oil amount fluctuation due to changes in the volume of entry of the piston rod 22 is also caused by oil reservoir chamber C (outer shell). 25
3), so there is no difference in damping force on the expansion stroke.

By the way, this hydraulic shock absorber 19 is a single rod type in which the piston rod 22 protrudes only from one side of the cylinder 20, so when used as a steering damper for a two-wheeled vehicle, for example, the mounting position on the cylinder 20 side (the position of the billow 18) is
By arranging it on the axis #Xl as on the piston rod 22 side, that is, in the center of the bottom of the cylinder, it is possible to install it in a state where almost no bending moment is applied to the piston rod 22, etc., and by reducing the longitudinal dimension. The installation space is also small.

Note that an orifice may be used instead of the single valve 30 as the damping force generating means.

(Effects of the Invention) In summary, according to the present invention, a piston is slidably housed in a cylinder, oil chambers are defined on both sides of the piston, and a piston rod connected to the piston protrudes from one end of the cylinder. The oil chambers on both sides of the piston are connected via a check valve that prevents the flow of hydraulic oil from the oil chamber on the piston rod side to the oil chamber on the opposite side. An oil sump chamber is provided to compensate for volume fluctuations, and a damping force generating means is provided in a passage connecting the oil sump chamber and the oil chamber on the piston rod side to generate a damping force by throttling the hydraulic oil flowing toward the oil sump chamber side. Similarly, check valves are installed in the passages that communicate the oil sump chamber and the oil chamber on the opposite N side to prevent the flow of hydraulic oil toward the oil sump chamber, and the cross-sectional area of the piston rod is It is set to approximately 1/2 of the cross-sectional area to prevent the difference y4 from occurring in the damping force on the expansion stroke even though a single loft type is used, so there is almost no bending moment in the piston rod etc. It can be installed in a non-active state, resulting in improvements in the reliability and durability of the device and reduction in installation space.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the structure of an embodiment of the present invention, Figure 2 is a cross-sectional view of the structure of the prior art, and Figure f:tS3 is a diagram of its installation state. 20...Cylinder, 21...Piston, 22...
Piston rod, 25.33...Reverse 11-valve, 30.
・・Makekuru valve, 24, 31. 32・・Passage, A, B
...Oil room, C...Oil sump room. Procedural amendment 3rd]-n Mi1, Indication of case Patent Application No. 101234 of 1988 2, Name of invention Steering gunba 3, Person making amendment Relationship with case Patent applicant address 2 Hamamatsucho, Minato-ku, Tokyo Chome 4-1 World Trade Center Building Name (092) Kayabae Gyo Co., Ltd. 4, Agent 9 Jin 4,1~,. 1. ++、"j'7whitelfu; shout column. 7. Contents of amendment (1) The scope of claims of the specification is amended as shown in the attached sheet. (2) On page 4, line 513 of Pt. 7. It is made of elastic material such as rubber or resin, as shown in 1-7.
An oil sump chamber defined by an oil seal is provided.'' (3) From line m1 to line tl'IJ on page 10 of the same page, the phrase ``provided with an oil sump chamber'' was changed to ``an oil sump defined by an outer shell made of an elastic material such as rubber or resin.''``I'll set up a room.'' (4) On page 10, line 10 of the same page, ``I tried to prevent this, so
] has been amended to read, ``In addition to preventing aeration of the hydraulic oil, it always provides stable loading force characteristics.'' ``Claims: A piston is slidably housed in a cylinder to define oil chambers on both sides of the piston, a piston rod connected to the piston protrudes from one end of the cylinder, and the oil chambers on both sides of the piston are defined by the piston rod. It is connected via a check valve that prevents the flow of hydraulic oil from the oil chamber on one side to the oil chamber on the opposite side, and also prevents oil volume fluctuations caused by changes in the volume of the piston rod entering the cylinder from the oil reservoir chamber to the piston. A damping force generating means for generating damping force by squeezing the hydraulic oil flowing toward the oil sump chamber is installed in the passage that communicates the oil chamber on the rod side, and also in a passage that communicates the oil sump chamber with the oil chamber on the opposite side. A steering damper characterized in that the cross-sectional area of the piston rod is set to approximately 1/2 of the cross-sectional area of the piston, while each is provided with a check valve that prevents the flow of hydraulic oil to the oil reservoir side. .”

Claims (1)

[Claims] A piston is slidably housed in a cylinder to define oil chambers on both sides of the piston, and a piston rod connected to the piston protrudes from one end of the cylinder, so that the oil chamber on the piston screen is separated from the oil chamber on the piston rod side. It is connected via a check valve that prevents the flow of hydraulic oil to the oil chamber on the opposite side, and an oil sump chamber is provided outside the cylinder to compensate for oil volume fluctuations caused by changes in the piston rod entry volume. A damping force generating means that generates damping force by throttling the hydraulic oil flowing toward the oil reservoir is installed in a passage that communicates the reservoir chamber with the oil chamber on the piston rod side, and also communicates the oil reservoir with the oil chamber on the opposite side. A check valve for blocking the flow of hydraulic oil toward the oil reservoir chamber is installed in each passage, and the cross-sectional area of the piston rod is set to approximately 1/2 of the cross-sectional area of the piston. steering damper.