JPH0612308B2 - Method and apparatus for evaluating shock absorber valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shock absorber valve evaluation method and apparatus, and in particular, determines the quality of each shock absorber valve before it is assembled into a shock absorber assembly. The present invention relates to an improvement of a shock absorber valve evaluation method and a device therefor that are suitable for use.

[Conventional technology]

A shock absorber assembly attached to a vehicle such as an automobile has a structure schematically shown in FIG. 5, for example.

That is, the shock absorber assembly 50 has a structure in which the rod valve 54 is slidably fitted inside the shell 52 having a double-structured cylinder, and the base valve 56 is fixed to the bottom.

The rod valve 54 has a pair of one-way valves 542,
544 is provided, and the base valve 56 is also provided with a pair of one-way valves 562 and 564.

Oil 53 is filled inside the shell 52 in which the rod valve 54 and the base valve 56 are fitted.

The base valve 5 is also provided inside the shell 52 formed by the outer shell 522 and the inner shell 524.
The oil 53 is made to circulate through 6.

Further, 57 is an upper lid that closes the upper end of the shell 52, and 58 is a rod that penetrates the upper lid 57 and expands and contracts.

The operation of the shock absorber assembly 50 having the above configuration will be briefly described. The rod 58 of the shock absorber assembly 50 expands and contracts as the vehicle vibrates.

When the rod 58 is compressed in the direction of arrow A, the one-way valve 542 is opened by the lowering of the rod valve 54, and the one-way valve 562 is further opened to allow the oil 53 to flow as shown by the solid arrow.

As a result, the vibration applied to the vehicle is softly absorbed and the ride comfort is maintained.

At this time, the one-way valve 544 and the one-way valve 56 are
4 is naturally closed.

On the other hand, when the rod 58 is extended in the arrow B direction,
As the rod valve 54 rises, the one-way valve 544 opens,
Further, the one-way valve 564 is opened to allow the oil 53 to flow as indicated by the broken line arrow.

As a result, with respect to the applied vibration, the function of promptly returning the vehicle to the original state before the vibration is exhibited.

At this time, the one-way valve 542 and the one-way valve 56 are
2 is naturally closed.

Rod valve 54 and base valve 5 according to the above configuration
The structure of 6 will be further described with reference to their cross-sectional views.

FIG. 6 is a sectional view showing a specific structure of the rod valve 54. The one-way valve 542 is composed of a non-return valve 545 and a non-return spring 546.

The one-way valve 544 is composed of a valve leaf 548 and a compression spring 547. 549 is a seat spring.

On the other hand, FIG. 7 is a sectional view showing a specific structure of the base valve 56, and the one-way valve 562 is composed of a valve leaf 565 and a seat leaf 566.

The one-way valve 564 is composed of a non-return valve 568 and a conical spring 569. 5
67 is a washer.

By the way, the conventional rod valve 5 of the shock absorber
4 or the quality of the base valve 56 was determined with the shock absorber assembly 50 assembled.

That is, the shock absorber valve is evaluated individually by measuring the damping force applied to the rod 58 by expanding and contracting the rod 58 by vibrating the rod 58 with the shell 52 fixed.

[Problems to be solved by the invention]

However, the conventional shock absorber valve evaluation method has the following problems when it is determined to be defective because the evaluation is performed in the state of the shock absorber assembly.

That is, the shock absorber assembly 50 must be disassembled into individual valves and then repaired, which is very troublesome to repair.

In addition, there is a problem in that it is not possible to notify the occurrence of a defective product as a single valve product in advance to the assembly process of each single valve product, and feedback information indicating that the product is defective is delayed.

Further, in a shock absorber of a type that cannot be disassembled into individual valves, there is a problem that it cannot be reworked later and must be discarded.

Therefore, an object of the present invention is to eliminate the trouble of reworking a defective shock absorber assembly after assembly of the assembly, and to find the defective product and defective portion of each individual valve constituting the shock absorber assembly before assembly of the assembly. It is in.

[Means for solving problems]

For this reason, the shock absorber valve evaluation method and apparatus according to the present invention are characterized in that, before the shock absorber assembly is assembled, each valve constituting the assembly is judged as good or bad in a single item state. Is.

Specifically, a first invention according to the present invention is a method for evaluating a shock absorber valve provided with a pair of one-way valves which can flow in directions opposite to each other, wherein the shock absorber valve is provided in a fluid passage. And to pass the oil alternately from both sides of the shock absorber valve, and measure the flow rate of the oil passing through the one-way valve to judge the quality of the shock absorber valve from the flow rate. Is a shock absorber valve evaluation method.

A second aspect of the invention is a jig provided in the fluid passage for fixing the shock absorber valve, and a switching valve provided in the fluid passage for switching the flow direction of the oil supplied by the pump to two systems. And a pressure regulating valve and a flow meter provided in a common passage of the fluid passages of the two systems, the pump sending out oil, and a shock absorber valve evaluation device.

[Action]

The operation of the present invention according to the above configuration will be described. A shock absorber valve is fixed in a fluid passage so as to partition the passage, oil is allowed to flow alternately from both sides of the shock absorber valve, and the one-way valve is By measuring the flow rate of the oil passing therethrough, the quality of the shock absorber valve can be judged from the flow rate.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic view showing a shock absorber valve evaluation apparatus according to the present invention, but FIG. 2 is a schematic view showing an operation state of the shock absorber valve evaluation apparatus different from that shown in FIG.

In the present embodiment, a case will be described in which the quality of the rod valve in the shock absorber valve is determined.

The shock absorber valve evaluation apparatus 1 is composed of a jig 2 for fixing a rod valve of a shock absorber, switching valves 3, 4, 5, a pressure adjusting valve 6 and a flow meter 8.

A jig (hereinafter referred to as a jig) 2 for fixing the rod valve of the shock absorber is for fixing the rod valve 102 of the shock absorber in the fluid passage 22.

The switching valves 3, 4 and 5 are provided in the fluid passage 22 and are for switching the flow direction of the oil supplied by the pump 9 through the common passage 11 to two systems.

The fluid passage 22 for the oil of the two systems is provided with the switching valve 3
Even if the direction of the oil flowing through the fluid passage 22 is changed to two systems, the common passage 11 whose direction does not change
Connected with.

In addition, the switching valves 4 and 5 cooperate with the switching valve 3 to change the oil flow direction in the fluid passage 22 to the direction shown in FIG.
This is for switching in the directions indicated by the arrows in the figure.

The switching valves 4 and 5 are both three-way valves, and one direction is connected to a tank 16 for pumping oil by a pump 9 through passages 14 and 15, respectively.

The pressure adjusting valve 6 cooperates with the relief valve 64 to adjust the oil in the common passage 11 to a set pressure, and is provided in the middle of the common passage 11.

The relief valve 64 is provided in the passage 62 that is taken out by bypass from the middle of the shared passage 11 and returned to the tank 16. Since the structure of the relief valve 64 is known, detailed description thereof will be omitted.

The flowmeter 8 is for measuring the flow rate of oil flowing through the common passage 11, and is provided on the downstream side of the pressure adjusting valve 6 in the common passage 11.

Further, on the further downstream side of the flow meter 8, a pressure gauge 12 for measuring the pressure of oil flowing through the common passage 11 is provided.

Reference numeral 13 is a check valve for preventing backflow of oil flowing through the common passage 11.

A shock absorber rod valve 1 using the shock absorber valve evaluation apparatus 1 according to the above configuration
02 is evaluated by the following procedure.

First, a case where the rod 112 of the rod valve 102 of the shock absorber is compressed will be described with reference to FIG.

At this time, the oil sent from the pump 9 flows from the common passage 11 through the switching valve 3 through the fluid passage 22 in the arrow direction.

As a result, the oil opens the one-way valve 122 of the rod valve 102 fixed to the jig 2 and flows as indicated by the solid arrow. At this time, the one-way valve 124 is closed.

Then, at this time, the pressure in the common passage 11 is measured by the pressure gauge 12, and the pressure adjusting valve 6 and the release valve 64 are adjusted so that the set pressure becomes constant.

After reaching the set pressure in this way, the flow rate is measured by the flow meter 8.

Next, a case where the rod 112 of the rod valve 102 is extended will be described with reference to FIG.

At this time, by switching the switching valves 3, 4, and 5, the oil flows from the common passage 11 through the switching valve 3 in the fluid passage 22 in the arrow direction.

As a result, the oil opens the one-way valve 124 of the rod valve 102 fixed to the jig 2 and flows as shown by the broken line arrow. At this time, the one-way valve 122 is closed.

Then, the pressure in the common path 11 is measured again by the pressure gauge 12, and the pressure adjusting valve 6 and the relief valve 64 are adjusted so that the set pressure becomes constant.

After reaching the set pressure in this way, the flow rate is measured by the flow meter 8 in the same manner as when the rod 112 is compressed.

As described above, if the flow rate measurement values in both the compression and extension directions are within the flow rate range of a good product, it can be determined as a good product (OK).

On the other hand, if either the compression or the expansion is outside the flow rate range of the non-defective product, it can be determined as a defective product (NG) and the cause of the defect can be estimated from the flow rate value.

In this way, by measuring the flow rate of oil passing through the one-way valves 122 and 124, it is possible to determine the quality of the shock absorber valve from the flow rate.

It should be noted that, in the above-described embodiment, the case of making a pass / fail judgment of the rod valve has been described as an example, but the pass / fail judgment of the base valve can be performed by a completely similar method, and therefore detailed description is omitted. To do.

Although the specific embodiment of the present invention has been described above, the present invention is not limited to this, and various other modes that can be implemented by those skilled in the art are conceivable within the scope of the claims.

For example, although the pressure gauge is provided on the downstream side of the flow meter in the above embodiment, the flow meter may be provided on the downstream side of the pressure gauge.

〔The invention's effect〕

As described above, in the shock absorber valve evaluation method and apparatus according to the present invention, before the shock absorber assembly is assembled, the quality of each valve that constitutes the assembly is judged as a single item. After assembling the defective product, the trouble of reworking can be saved.

In addition, since defective parts and defective parts of the individual valves constituting the shock absorber assembly can be found before the assembly of the assembly, it is possible to reduce the defective rate by evaluating the damping force of the shock absorber in the assembled state.

Furthermore, the characteristics of the flow rate are shown in Figs.
Since it is different as shown in the figure, if the NG flow rate value is set according to the cause of failure, it can be estimated which part of each valve is out of stock, and the repair time can be shortened. This has the excellent effect of being able to quickly provide feedback to the single product assembly process.

[Brief description of drawings]

FIG. 1 is a schematic view showing a shock absorber valve evaluation apparatus according to the present invention, FIG. 2 is a schematic view showing an operation state of the shock absorber valve evaluation apparatus different from FIG. 1, and FIG. 3 is a rod valve. 4 is a graph showing the flow rate characteristic in the extending direction of the base valve, FIG. 4 is a graph showing the flow rate characteristic in the compression direction of the base valve, FIG. 5 is a schematic diagram schematically showing the structure of the shock absorber assembly, and FIG. FIG. 7 is a sectional view schematically showing the structure, and FIG. 7 is a sectional view schematically showing the structure of the base valve. 1 …… Shock absorber valve evaluation device 2 …… Jigs 3, 4, 5 …… Switching valve 6 …… Pressure adjusting valve 8 …… Flowmeter 9 …… Pump 11 …… Common path 12 …… Pressure gauge 13 …… Check valve 16 Tank 22 Fluid passage 64 Relief valve 102 Rod valve (shock absorber valve) 112 Rod 122, 124 One-way valve

Claims (2)

[Claims] 1. A method for evaluating a shock absorber valve provided with a pair of one-way valves that can flow in mutually opposite directions, wherein the shock absorber valve is fixed in a fluid passage so as to partition the passage, and the shock absorber is fixed. An evaluation method of a shock absorber valve, characterized in that oil is alternately flown from both sides of the valve, and a flow rate of the oil passing through the one-way valve is measured, and the quality of the shock absorber valve is judged from the flow rate. . 2. A jig provided in the fluid passage for fixing the shock absorber valve; a switching valve provided in the fluid passage for switching the flow direction of oil supplied by a pump to two systems; An apparatus for evaluating a shock absorber valve, comprising a pressure adjusting valve and a flow meter provided in a common passage of the fluid passages of the two systems in which a pump sends out oil.