JPS6044636A - Hydraulic buffer having automatic temperature control function - Google Patents

Abstract

PURPOSE:To obtain a constant buffer effect by providing a sensor spring formed of a shape memory alloy and controlling an orifice of a liquid passage according to a change in temperature. CONSTITUTION:A temperature control ring valve 18 is slidably disposed in such a manner as to surround the periphery of a temperature control orifice 21 comprising a plurality of small holes. Above the temperature control ring valve 18, a bias spring 17 is disposed between the valve 18 and a partition wall 15 fixed to the inner tube 2, and a sensor spring 19 formed of a shape memory alloy is disposed below the valve 18. With a rise in temperature, the sensor spring 19 is expanded against the bias spring 17 to lift up the temperature control ring valve 18 and reduce the orifice 21, which can prevent a lowering of a buffer effect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic shock absorber that always operates stably against temperature changes.

Generally, in a hydraulic shock absorber, when the temperature rises, the viscosity of the liquid decreases, and the buffer capacity decreases.

For this reason, a buffer set in the winter may not be able to fully demonstrate its capacity in the summer and may need to be readjusted, or even at the same ambient temperature, the buffer capacity may decrease during use due to self-heating of the buffer, resulting in bottoming phenomenon. may occur. The present invention takes the above points into consideration and provides a constant buffering effect by controlling the orifice hole of the liquid passage as the temperature rises.

FIG. 1 is a structural diagram of a hydraulic shock absorber according to the present invention. Inside the outer tube 1, which has a thread cut on its outer periphery,
An inner tube 2 is housed, and a piston 4 integrated with a piston rod 3 is slidably housed inside the inner tube 2. A valve ball 7 for opening and closing the passage hole 8 is disposed in the center of the piston 4.

Furthermore, the piston 4 is always repelled upward by the return spring B. An adjustment knob 5 that also serves as a bottom cover is pivotally supported at the bottom of the tri inner tube 2. This inner tube 2 is provided with a passage hole 10, and an adjustment knob 5 located opposite thereto has a flow rate adjustment groove 1.
1, and a part thereof is provided with a flow rate adjustment hole 12. As shown in FIG. 2(a), if the passage hole 10 of the inner tube 2 and the flow rate adjustment hole 12 of the adjustment knob 5 face each other, the liquid 20 will flow as shown in the arrow. can be moved from the inside to the outside of the inner tube 2 over the shortest distance with small viscous resistance. On the contrary, Figure 2 (
When the passage hole 10 of the inner tube 2 and the flow rate adjustment hole 12 of the adjustment knob 5 are shifted by 180 degrees as shown in b), the liquid 20 flows into the flow rate adjustment groove 11 after exiting the flow rate adjustment hole 12. Since the inner tube reaches the passage hole 10 and exits the inner tube 2, the viscous resistance increases.

On the other hand, there is a gap between the outer tube 1 and the inner tube 2, and an accumulator 14 is inserted into the upper part of this gap. A partition wall 15 is provided on the inner tube 2 so as to hold the accumulator 14 therein. Although it is inexpensive to make the partition wall 15 integrally with the inner tube 2 as shown in FIG. 1, it is also preferable to screw it into the inner tube 2 so that the initial setting of the bias spring 17 at the bottom can be varied.

In contact with this bias spring 17, the temperature control ring valve 1
8, and a sensor spring 19 is configured further below. This temperature control ring valve 18 has a temperature control orifice 21 (or a slit-shaped temperature control orifice 21 ) formed of a plurality of small holes provided in the inner tube 2 .
), and is slidably arranged so as to wrap around it. The sensor spring 19 used in the present invention is generally called a shape memory alloy, and has the property of returning to its initial shape and increasing its elastic modulus when a predetermined temperature is exceeded.

Next, the operation of this hydraulic shock absorber will be explained. First passage hole 10
The flow rate adjustment hole 12 is positioned relative to the flow rate adjustment hole 12, and the adjustment knob 5 is rotated so that the shock absorption state is appropriate. At this time, if the room temperature is about 20°C, the temperature control ring valve 18 will open the inner small hole 21- of the temperature control orifice 21 as shown in FIG.
4 is in a closed state. If an impact is applied to the piston rod 6 from the outside, as is conventionally known,
The valve ball 7 of the piston 4 closes the passage hole 9, and the liquid 20 passes through the flow rate adjustment hole 12, the flow rate adjustment groove 11, the passage hole 10, the accumulator 14, and the passage hole 9, and moves above the piston 4. A portion of the strained liquid 20 passes through the small holes 21-1.21-2.21-3' of the temperature control oriswiss.

Therefore, the area of the orifice through which the liquid 20 passes is the sum of these areas. If the temperature of the shock absorber body rises due to self-heating or the influence of outside air temperature, the liquid 2
In conventional products, the viscosity of 0 is lower and the absorption capacity of the buffer is significantly lower. However, in this product, the sensor spring 19 stretches against the bias spring 17,
In order to move the temperature control ring valve 18 upward according to the rising temperature range, the small hole 21-3, 21-2 of the temperature control orifice is closed. Therefore, the overall orifice area is reduced, and even if the viscosity of the liquid 20 decreases, the performance of the buffer does not decrease. On the other hand, when the outside temperature drops, such as in winter, the elastic coefficient of the sensor spring 19 decreases, and the elastic force of the bias spring 17 moves the temperature control ring valve 18 downward, causing the small hole 21 of the temperature control orifice 21 to move downward.
-1 to 21-4'r open. On the other hand, since the viscosity of the liquid 20 increases, the capacity of the buffer does not decrease. In this way, even if the viscosity of the liquid 20 changes with temperature, the sensor spring 19 works to compensate for this, and the small hole of the temperature control orifice 21 is opened and closed, so the hydraulic pressure always operates stably. This is something that can be obtained through gradual detoxification.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of the hydraulic shock absorber of the present invention, FIG. 2 is an explanatory diagram of a flow rate adjustment mechanism, and FIG. 3 is an explanatory diagram of a temperature adjustment mechanism. 1... Outer tube, 2... Inner tube,
6... Piston Rondo, 4 - Piston, 5... Adjustment knob, 6... Return spring, 7... Valve ball,
8, 9, 10. 16... Passage hole, 11... Flow rate adjustment groove, 12... Flow rate adjustment groove, 16... Stopper, 14.
...Accumulator, 15...Partition wall, 17...Bias spring, 18...Temperature control ring valve, 19.
-Sensor spring, 20...Liquid, 21 Temperature control orifice. Patent applicant No. 2

Claims (1)

[Claims] (1) An inner tube installed in the outer tube, a piston that moves up and down inside the inner tube, a piston mouth/nod, and a liquid that moves through a flow rate regulator due to the up and down movement of the piston and piston rond. In a hydraulic shock absorber consisting of a body, a one-long temperature control valve that opens and closes the flow rate adjustment hole or a separately provided temperature control orifice, and a temperature control ring valve that is provided to elastically repel the temperature control ring valve in one direction, The ring valve is made of spring material and is designed to resist the ear spring so as to reduce the open area of the flow rate adjustment hole marked niI or the first temperature control ring valve as the temperature rises. It is designed to repel bullets,
A hydraulic shock absorber with an automatic temperature adjustment function, characterized by being composed of a sensor spring made of a shape memory alloy material.