JPH068154B2 - Oil injection device for fluid coupling - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for injecting oil into a fluid coupling that operates by enclosing high-viscosity oil.

(Prior Art) A large number of discs with holes are axially arranged in a cylindrical case that rotatably supports a shaft, and the discs are alternately fixed to the shaft side and the case side in the rotational direction. A fluid coupling that operates by filling highly viscous oil (silicon oil) in a case is known.

In this fluid coupling, a strict volume ratio (80 to 65%, containing a certain amount of air to select the torque characteristics of the product,
Encapsulation of highly viscous oil, preferably 90-95%) is required. However, since the case of the fluid coupling is partitioned by a large number of discs, and the oil filled in this narrow space has a high viscosity (60000 cst) like silicon oil, it is very difficult to obtain the desired oil volume ratio. It was difficult.

Therefore, the present inventors have filed Japanese Patent Application No. 60-266853 (Japanese Patent Application Laid-Open No. 62-135195) and Japanese Patent Application No. 60-266.
Japanese Patent Laid-Open No. SHO 62-135186 proposes an oil injection method capable of evacuating the inside of a fluid coupling case and injecting oil at a low pressure flow rate to obtain a desired oil volume ratio in a short time. did.

In this case, as a means for checking how much oil has been injected into a predetermined fluid coupling, a curve of the injection amount and the injection time when the nozzle diameter of the injection portion is constant is created to control the injection time. The time management method was adopted.

(Problems to be Solved by the Invention) Although the above time management method is a simple means, it is not necessarily accurate because it does not directly measure the oil flow rate. In other words, the flow resistance in the case is not constant due to the phase difference of the round hole or the long hole formed in the disc that is arbitrarily installed in the case of the fluid coupling, and the data obtained from the experiment shows the oil injection time. There was a problem that there was a large variation between the inflow rate and the inflow rate.

Therefore, the variation in the volume ratio of the oil due to the variation in the injection amount affects the performance of the fluid coupling.Therefore, the weight of each fluid coupling is precisely measured before the oil is injected and after the oil has flowed in for a predetermined time. Therefore, the volume ratio of oil was calculated, and when the amount was too large, the oil was removed, and when the amount was too small, re-injection of the oil was necessary, which necessitated an adjustment process.

However, the above-mentioned adjustment work is not easy and requires time, and therefore improvement has been desired.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a fluid coupling in which highly viscous oil is injected into a fluid coupling at a desired volume ratio in a short time with high precision. To provide an oil injection device.

(Means for Solving Problems) Means for solving the above problems include a case, a shaft arranged in the case, and a shaft arranged in the case.
In a device for enclosing highly viscous oil in a fluid coupling having a case and a plurality of plates with holes that are alternately attached to the shaft, a vacuum means is connected to an upper portion of the fluid coupling, and a lower portion of the fluid coupling is connected to a lower portion of the fluid coupling. The oil flow path was made to communicate, and the positive displacement type flow meter and the oil supply cutoff valve were arranged in the oil flow path. Then, while vacuuming the inside of the fluid coupling by the vacuum means, high-viscosity oil is supplied into the fluid coupling through the oil flow path at a low pressure and a low flow rate, and a flow rate signal from the flow meter is sent to the transmitter. It is sent to the integrator via the counter to count, and when a predetermined amount of oil is injected into the fluid coupling, the shutoff valve is closed by the signal from the integrator to stop the oil supply to the fluid coupling. Is.

(Function) When supplying highly viscous oil to the fluid coupling, measure the flow rate with a flow meter, count the amount of oil with an integrator via a transmitter, and shut off when a predetermined amount of oil is supplied to the fluid coupling. The valve stops the supply of oil into the fluid coupling. This makes it possible to obtain an accurate oil volume ratio for the fluid coupling.

Also, by supplying high-viscosity oil from the lower oil flow path while vacuuming from the upper part of the fluid coupling, there is no problem that the air remaining in the fluid coupling mixes into the oil, and the oil is supplied. Can be performed smoothly and the supply time can be shortened.

At this time, in order to further suppress the generation of bubbles, the gas is supplied at a low pressure and a low flow rate.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying FIGS.

FIG. 1 shows a fluid coupling 1 installed in a predetermined device, which includes a cylindrical case 2 having large and small holes 2a and 2b, a shaft 3 inserted into the case 2, A plurality of hub plates 5 mounted on the shaft 3,
A plurality of case plates 6 attached to the case 6, ...
And a case cover 4 having a through hole 4a in the center, and the like. The rotational torque from the shaft 3 is transmitted to the case 2 or the rotational torque from the case 2 is transmitted to the shaft 3.
To convey to.

Small diameter hole 2a of the case 2 and large diameter hole 2b of the case 2
The shaft 3 is rotatably supported by being inserted into the through hole 4a of the case cover 4 which closes one end thereof. The small diameter hole 2a of the case 2 and the through hole 4a of the case cover 4 each have a substantially sectional shape. The rectangular seal packings 7, 7 are attached, and the case 2, the case cover 4 and the shaft 3 are attached.
The gap between and is sealed. The tip of the shaft 3 is supported by the case 2 via a ball bearing 8, and the case 2 and the case cover 4 are integrally joined in a sealed state.

A spline portion 3a extending in the axial direction is formed on the outer circumference of the shaft 3 in the space S formed by the large-diameter hole 2b of the case 2 and the case cover 4, and the spline portion is also formed on the inner wall of the space S of the case 2. 2c is formed, the shaft 3
In the spline portion 3a of the
... are fitted and arranged in the axial direction, and each hub plate 5,
Rings 9 are provided on the inner peripheral side between. Further, a large number of disk-shaped case plates 6, ... Facing between the hub plates 5, ... Are fitted to the spline portion 2c of the case 2.

Hub plate 5 and case plate 6 are shown in Figs. 2 (a) and (b).
As shown in FIG. 5, the hub plate 5 having the spline portion 5a on the inner circumference thereof has a large number of slit-shaped holes 5b, ... Radially formed from the outer circumferential side, and the case plate 6 having the spline 6a on the outer circumference has a circular shape. , A large number of holes 6b are formed radially. The combination of plates and the shape of the holes are not limited to this.

A high-viscosity (60 000 cst) silicone oil L is enclosed in the space S accommodating such a large number of hub plates 5, ... And case plates 6 ,. It is connected to each output shaft. Then, for example, when the shaft 3 is rotated by the input shaft, the case 2 is rotated through the hub plates 5, ..., Silicon oil L, the case plates 6, and the rotation is transmitted to the output shaft.

Reference numeral 10 is a plug that closes the oil inlet 2d of the case 2, and 11 is a plug ball that is press-fitted into the air vent hole 4b that releases air from the space S of the case 2.

FIG. 3 is an explanatory view of an oil injection device, 20 is an oil pressurizing tank, 30 is a positive displacement type flow meter, 40 is an ON-OFF control valve, 50 is a vacuum pump, and silicon oil L pressurizes the oil. From the tank 20 through the flow meter 30 and the control valve 40, it is injected into the case 2 of the fluid coupling 1 temporarily placed on the pedestal 60, and the air in the case 2 is discharged to the outside by the vacuum pump 50. To be done.

In the oil pressurizing tank 20, the pressurizing piston 22 moves downward in the upper and lower cylindrical cases 21 by the pressurizing air from the air supply nozzle 23, and the oil L inside the pressurizing piston 22.
It is pressurized by and is supplied with the pressurized oil L into the joint 1. A lower part of the cylindrical case 21 of the oil pressurizing tank 20 is connected to a funnel-shaped part 21a, and an oil outlet part 21b is formed in the central part of the funnel part 21a. The silicone oil L in the tank 20 is gradually discharged from the oil outlet portion 21b while maintaining a low pressure and low flow velocity.

The flow meter 30 is provided in the oil line 70 between the oil pressure tank 20 and the control valve 40.
The oil flow rate flowing through 0 is measured, and a momentary flow rate signal is sent to the integrator 32 via the pulse transmitter 31. The flow meter 30 is of a positive displacement type such as an oval flow meter, and the rotor in the case is rotated by the flow of the oil L to measure the flow rate. Therefore, the oil L is provided upstream and downstream of the flow meter 30. Produces little turbulence in the flow of.

The integrator 32 counts and integrates the amount of oil L supplied into the case 2 of the joint 1, and when the amount of oil injected into the joint 1 reaches a predetermined value, a signal is sent to the control valve 40. Is to be sent.

The control valve 40 is disposed below the gantry 60 of the joint 1, supplies the oil L flowing through the flow meter 30 into the case 2 through the oil inlet 2d of the joint 1, and outputs the signal from the integrating unit 32. Thus, the supply of the oil L into the case 2 is stopped. The vicinity of the oil outlet of the control valve 40 is connected to a discharge nozzle 42 through a funnel-shaped valve seat 41, and the discharge nozzle 42 is connected to the oil inlet 2d of the joint 1.
When the valve body 42 is inserted into the valve seat 42, the valve body 42 having a spherical tip end moves upward to come into contact with the valve seat 41 to shut off the valve.

The vacuum pump 50 is connected via a hose 51 to the air vent holes 4b, ... Arranged on the opposite side of the oil inlet 2d of the joint 1, that is, on the upper side of the joint 1, and the air in the case 2 is discharged to the outside. To be done.

Next, the operation of injecting the silicone oil L into the joint 1 will be described.

First, prior to oil injection, the vacuum pump 50 is operated to evacuate the joint 1. The oil L is flown into the oil pressure tank 20 by the head, and the flow meter 30 and the control valve 4 are connected.
0 and the oil line 70 is filled.

When the internal pressure of the joint 1 reaches a predetermined negative pressure (720 mmHg), the pressurizing piston 22 in the oil pressurizing tank 20 is slowly lowered by the pressurizing air in parallel with this evacuation, and at the same time, the control valve 40 The valve body 42 of the
Silicon oil L in the line and the oil pressure tank 20
Is discharged from the discharge nozzle 42 of the control valve 40 while maintaining a low pressure and low flow rate, and the silicone oil L is injected into the joint 1.

Then, the flowmeter 30 also operates along with the flow of the oil L, and the amount of oil injected into the joint 1 is counted by the integrator 32 via the pulse transmitter 31. When the amount of oil satisfying the desired volume ratio of the joint 1 is counted, the totalizer 3
The signal from 2 raises the valve element 42 of the control valve 40 to close it. After that, the discharge nozzle 42 and the hose 51 are removed, a plug is inserted into the oil inlet 2d, and the plug balls 11, ... Are pressed into the air vent holes 4b ,.

In order to inject the silicone oil L into the joint 1 while maintaining a low pressure and a low flow rate while performing vacuuming as described above,
The oil L flows into the joint 1 in a loose and layered manner,
The gap between the plates 5, 6, ... Is gradually filled through the holes 5b, 6b ,. The flow rate of the oil L flowing into the joint 1 is measured by the flow meter 30 and the amount of oil supplied into the joint 1 is counted by the integrator 32. Can be injected to obtain an accurate oil volume ratio.

In this way, the error of the oil injection amount by the flow rate control method is approximately equal to the error of the flow meter 30 and is about ± 0.7%, and the accuracy is significantly increased in the flow rate control method compared with the error of ± 10% by the conventional time control method. As a result, there is almost no need for the conventional adjustment after oil injection.

(Effects of the Invention) A flowmeter and a shutoff valve are arranged in the oil flow path that supplies highly viscous oil to the fluid coupling, and shuts off when a predetermined amount of oil is injected into the fluid coupling via the transmitter and integrator. Since the valve is closed, a predetermined amount of oil can be accurately injected into the fluid coupling to obtain the desired precise oil volume ratio, and at the same time vacuuming the upper portion of the fluid coupling while lowering Since the high-viscosity oil is supplied from the oil flow path at a low pressure and a low flow rate, it is possible to effectively suppress the generation of bubbles and to supply the oil into the fluid coupling in a short time.

In addition, since the oil flow meter is of the positive displacement type, the turbulence of the oil is unlikely to occur in the oil flow path, and therefore, the low pressure and low flow rate supply of the oil to the fluid coupling can be maintained.

[Brief description of drawings]

FIG. 1 is a diagram showing a fluid coupling, FIG. 2 is a diagram showing a hub plate and a case plate, and FIG. 3 is an explanatory diagram of an oil injection device. In the drawings, 1 is a fluid coupling, 2 is a case, 3 is a shaft,
5 is a hub plate, 6 is a case plate, 30 is a flow meter, 31 is a pulse transmitter, 32 is an integrator, 40 is a shutoff valve (control valve), 70 is an oil flow path, and L is highly viscous oil.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Masao Nitta 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture, Honda Engineering Co., Ltd. (56) Reference JP-A-59-93595 (JP, A) JP Sho 61-270526 (JP, A)

Claims (1)

[Claims] 1. A fluid coupling having a case, a shaft arranged in the case, and a plurality of plates having holes, which are arranged in the case and are alternately attached to the case and the shaft. In a device for sealing viscous oil, a vacuum means is connected to the upper part of the fluid coupling, and an oil channel is connected to the lower part of the fluid coupling, and a positive displacement type flow meter and an oil supply cutoff valve are arranged in the oil channel. A high-viscosity oil is supplied into the fluid coupling through the oil flow path at a low pressure and a low flow rate while the vacuum means is evacuating the fluid coupling, and a flow rate signal from the flow meter is transmitted. To the integrator for counting, and when a predetermined amount of oil is injected into the fluid coupling, the shutoff valve is closed by a signal from the integrator to stop the oil supply to the fluid coupling. Oil injection device to the fluid coupling, characterized in that.