JPS58191345A - Temperature compensating device for damper - Google Patents

Abstract

PURPOSE:To widen a temperature compensation range, by coating the outer periphery of a push rod in the part which extends outward from the inside of a cylinder with a material having a thermal conductivity smaller than that of the metal of the push rod. CONSTITUTION:In a temperature compensation device for a damper, in which a needle valve 20 adapted to be cooperated with a push rod 26 adjusts the open degree of an orifice 25 disposed in a passage 24 longitudinally extending through a piston 3 which is reciprocatingly fitted in a cylinder 1 charged with oil, the outer periphery of the push rod 26 at least in the part which extends outward from the inside of the above-mentioned cylinder 1, is coated with a material having a thermal conductivity smaller than that of the metal of the push rod 26.

Description

[Detailed description of the invention] The present invention relates to a temperature compensation device for a buffer.

In general, AIS devices used in suspension systems for vehicles such as motorcycles and passenger cars have a structure in which a piston is fitted into a cylinder filled with oil so as to be able to reciprocate. This AT device works as follows: (1) The piston reciprocates inside the cylinder due to the force received from the road surface, and this reciprocating movement causes the oil to flow through the piston.
When passing through the channel, the flow resistance caused by the constriction of the channel causes an X east direction to occur. But then,
If this mild Sti is used continuously for a long time, the oil in the cylinder will rise to the top of the J layer due to frictional heat, and the clay will drop as the temperature increases.'II @j 1! This means that the number of insults due to resistance will decrease.

In order to compensate for such changes in the oil pressure due to changes in oil IJA, conventionally an orifice was provided in the flow path that penetrates the upper rudder piston in the front and back, and a needle valve attached to this orifice was linked to the bushing rod. A temperature compensation device has been proposed in which when the oil temperature reaches 1 culm, the needle valve is moved by a small amount using the expansion of the bush rod to narrow the orifice, thereby preventing a decrease in flow resistance due to a decrease in the viscous layer. ing. However, in this 4-degree compensator, the bushing rod passes through the hole in the center of the piston rod and extends M4 to a position corresponding to the outside of the cylinder (2). In,
A considerable amount of heat from the bushing rod passes through the piston rod and is dissipated into the atmosphere. For this reason, the amount by which the bushing rod can expand due to thermal expansion is restricted, and there is a problem in that the circumference in which temperature compensation can be made becomes narrower.

SUMMARY OF THE INVENTION An object of the present invention is to provide an Alt compensator for a buffer which overcomes the above-mentioned disadvantages and can widen the temperature compensation range with a simple design.

The above purpose is 1! The shock absorber temperature compensator according to the present invention has a piston fitted in a cylinder filled with oil so as to be able to reciprocate, an orifice is provided in a flow path passing through the front and rear of the piston, and the orifice has a temperature of 1M degree. In a temperature compensator for an air conditioner, the temperature is adjusted by a needle valve that is linked to a bushing rod. It is characterized by being awarded with a low conductivity.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 is a side view showing the main parts of a motorcycle equipped with a shock absorber provided with the temperature compensation device of the present invention.

In FIG. 1, the shock absorber 30 has its front end retractable portion 6 connected to the rear end of a main frame 31, and its rear end mounting portion 5 connected to a rear arm 32.

211th! il is a sectional view showing details of the buffer 30.

In this figure, 1 is a cylinder, and an oil chamber 2 filled with oil is housed within the cylinder 1.

A piston 3 is fitted into the oil-filled cylinder 1 so as to be able to reciprocate, and a rod 4 connected to the piston 3 is provided so as to extend from the inside of the cylinder 1 to the outside. The attachment portion 5 is provided at the end of the rod 4 extending outward from the cylinder, and the attachment portion 6 is similarly provided at the opposite end of the cylinder 1.

Attachment II] A spring receiver 7 is fixed to the end of the rod 4 on the side where the 5 is provided, and a coil spring 9 is provided behind the spring receiver 8 fixed to the cylinder 11111.

Inside the piston 3, a solid passageway 22 is provided that penetrates forward and backward, and at one end of the passageway 22, a valve 23 made of a plate spring is provided. On the other hand, a base valve section 10 is provided at the bottom of the oil chamber 2 within the cylinder 1, and the cylinder 12 is further connected to the base valve section 10 via a pipe 11. A free piston 15 is fitted into the cylinder 12, and the free piston 15 separates the cylinder 12 into an oil chamber 13 and a gas chamber 14. The oil chamber 13 is communicated with the oil chamber 3 via the base valve part 10 by a pipe 11, and the gas chamber 14 is filled with high pressure gas to balance the pressure of the oil chamber 13 which communicates with the oil chamber 3. 5) I'm trying to do it. The base valve part 0 is provided with flow passages 16 and 17 of the second system gun so as to pass concentrically back and forth,
One channel 16 is provided with a valve 1B which is a root valve, and the other channel 17 is provided with a valve 19 which is also a plate valve. The former valve 1 allows oil to flow from the oil chamber 3 to the pipe 11 side, but prevents oil from flowing in the opposite direction.
Is#t, and the latter valve 19 has a check valve function that allows oil to flow from the pipe 11 into the oil chamber 3, but prevents oil from flowing in the opposite direction.

Reference numerals 20 and 21 indicate needle valves that respectively adjust the negative movement amount Wi. Of these, the needle valve 20 is arranged so as to face the orifice 25 of the piston 3,
The orifice 25 is provided at the rear end of a flow path 24 that passes through the center of the piston 3 in the front and back directions. A bushing rod 26 is integrally connected to the rear portion of the needle valve 20. Bush rod 26 is +9 heat till
The length of the rod is long enough so that the amount of water can be obtained (6), and it is passed through the hole drilled in the center of the mouth/end 4 of the rod. It extends to the end. The bushing rod 26 is made of a material such as a magnesium alloy or an aluminum alloy, which has high heat lfM resistance, and the orifice 25 is slightly moved back and forth by drawing the wire according to the oil temperature. That is, when the oil 1 is low, the opening degree of the orifice 25 at the tip is increased, and when the oil 1 is high, the tuff of the orifice 25 at the tip is made small.

Moreover, as shown in FIG. 3, the outer periphery of this push rod 26 has a length corresponding to about half of the total length of the bushing rod 26 at the corresponding portion projecting outward from the cylinder 1! The heat conductivity of the plastic, glass, ceramic, etc. is lower than that of the metal of the bushing rod. In this case, this storeroom 2
If the line expansion rate of 7 is significantly different from the line expansion rate of push rod 26, this shed 27 can be formed into a cane so that it can be slid in the darkness with push rod 26. In the above-mentioned &ls device, the bushing rod 26 in the temperature compensator is affected by a storeroom 27 with low thermal conductivity over a length β of the outer periphery of the bushing rod 26 in the corresponding portion that protrudes outward from the cylinder 1 and contacts the atmosphere. Therefore, the heat received by the bushing rod 26 from the oil in the cylinder 1 is
It is difficult to conduct to the rod 4. Therefore, the amount of heat from the bushing rod 26 that is dissipated into the atmosphere through the rod 4 is reduced compared to the Kaku system in which the storeroom 27 is not exposed. Therefore, the bushing rod 26 can be expanded over a wide range by the heat of the oil in the cylinder 1, and as a result, the operating range of the needle valve 26 can be expanded, and its temperature compensation range can be increased. can.

In addition, in the above-mentioned embodiment, the bushing rod 26 and the needle valve 25 are configured to be integrally connected.
If necessary, both may be constructed separately, and each may be in the form of a connecting rod that simply makes contact with each other.

As described above, in the present invention, a piston is fitted into a cylinder filled with oil so as to be reciprocally movable, an orifice is provided in the passage passing through the front and rear of the piston, and the Nff of the orifice is made to move in conjunction with the bushing rod. In a temperature compensating device for a recirculator, at least the outer periphery of a portion of the bushing rod protruding outward from the inside of the cylinder is made of a material having a lower thermal conductivity than the metal of the bushing rod. Since the structure is configured to be affected by the temperature, the heat dissipated from the bush rod into the atmosphere is small (and the bush rod extends over the high I5 area) and can perform thermal expansion, thus reducing its temperature compensation range. It becomes possible to expand.

[Brief explanation of drawings]

Fig. 1 is a side view showing the main parts of a motorcycle equipped with an a balance device equipped with the i11 degree compensator of the present invention, and Fig. 2 is a 4-sectional view of the same shock absorber, and Fig. J is an enlarged cross-sectional view (9) (b) of a part of the bushing rod of the same shock absorber. 1. Cylinder, 2. Oil chamber, 3. Piston, 4. Rod, 20. Needle valve, 24. Flow path, 25. Orifice, 25. Psoschrond. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita (10)

Claims (1)

[Claims] A piston is inserted into a cylinder filled with oil so that it can reciprocate, an orifice is provided in the flow path that passes through the front and rear of the piston, and the Nff of the orifice is connected to the bushing rod.
5. In the temperature compensator of the &l balance device, at least the outer periphery of the portion of the bushing rod protruding outward from the inside of the cylinder is covered with a material having a lower thermal conductivity than the metal of the bushing rod. A one-time compensation device for a buffer.