JPH02152695A - Apparatus for injecting viscous fluid - Google Patents

Abstract

PURPOSE:To shorten the injection time of a viscous fluid in a fluid joint and to reduce the number of processings for assembling the fluid joint to a large extent by stopping an inner shaft at a position where the injection pressure of the viscous fluid detected by a pressure detection means becomes min. CONSTITUTION:The injection pressure of the viscous fluid L injected in a fluid joint 1 is detected by a pressure detection means 40 and a motor 44 is stopped at the rotary position of an inner shaft 3 where the detected injection pressure becomes min. by a control part 42 and the inner shaft 3 is locked at that position. The control part 42 stores the rotary position of the inner shaft 3 at the point of time when the injection pressure of the viscous fluid L is lowered most on the basis of the signal from the pressure detection means and the signal from a rotary encoder 45 and the stop position accuracy of the inner shaft 3 becomes high and the inner shaft 3 is certainly stopped at a position where the viscous fluid L is easiest to inject. It becomes possible to determine the position where the flow passage resistance in an operation chamber 5 becomes smallest by the rotation of the inner shaft 3 and the injection time of the viscous fluid L in the fluid joint can be shortened to a large extent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a viscous fluid injection device for injecting viscous fluid into a fluid coupling serving as a power transmission device.

(Prior Art) Fluid couplings are often used in rotational drive systems of mechanical devices to alleviate torque fluctuations, as shown in Figures 2 to 5.
The figure shows an example of a fluid coupling using viscous fluid.
In the figure, 1 indicates a fluid coupling as a power transmission device, and an outer case 2 is located on the outer periphery. The outer case 2 is composed of members 2a, 2b, 2C, and 2d. An inner shaft 3 is located inside the outer case 2. The inner shaft 3 is rotatably held by members 2a and 2c of the outer case 2.

A sealing member 4 for sealing a gap between the outer case 2 and the inner shaft 3 is attached to each of the members 2a and 2c of the outer case 2.

A working chamber 5 is formed between the outer case 2 and the inner shaft 3 and extends in the circumferential direction. A large number of ring-shaped outer plates 6 and inner plates 7 are housed in the working chamber 5 in a stacked state. As shown in FIG. 3, the outer plate 6 is provided with tooth portions 6a on its outer circumferential portion that engage with splines 2f formed on the inner circumferential surface of the outer case 2. As shown in FIG. Furthermore, a plurality of slits 6b extending in the radial direction are formed in the inner peripheral portion of the outer plate 6. As shown in FIG. 4, the inner plate 7 is provided with tooth portions 7a on its inner circumferential portion that engage with splines 3a formed on the outer circumferential surface of the inner shaft 3. As shown in FIG. Moreover, a plurality of slits 7b extending in the radial direction are formed in the outer peripheral portion of the inner plate 7. This slit 7
The number b is greater than the number of slits 6b in the outer plate 6.

In the member 2C of the outer case 2, a highly viscous fluid is sealed in an operating chamber 5 in which a second injection port 2e is formed. The viscous fluid is injected into the working chamber 5 from either one of two injection ports 2e, and after injection, the injection port 2e is closed by a port 8 having a sealing function. It has become.

In such a flow path joint 1, for example, the rotational driving force of the inner shaft 3 is transmitted to the outer case 2 by the viscous force of the viscous fluid interposed between the outer plate 6 and the inner plate 7.

FIG. 6 shows a device for injecting viscous fluid into the working chamber 5 of the fluid coupling 1 shown in FIG. In the figure, reference numeral 11 indicates a stand on which the fluid coupling 1 is set.

A vacuum pump 13 is connected to one inlet of the fluid coupling l via a valve 12. A fluid pumping means 15 is connected to the other injection port via a valve 14. Further, the fluid pressure feeding means 15 is connected to a replenishment tank 17 via a valve 16.

In such a viscous fluid injection device, first, the inside of the working chamber 5 of the fluid coupling 1 is evacuated by the vacuum pump 13. Thereafter, the valve 12 is closed, the valve 14 is opened, and the viscous fluid is injected into the working chamber 5 by the fluid pumping means 15. As a result, the gap between the outer plate 6 and the inner plate 7 is filled with the viscous fluid. Note that the valve 16 is used only when replenishing the fluid pressure feeding means 15 with viscous fluid from the replenishment tank 17.

[Problem to be solved by the invention]

By the way, when assembling the fluid coupling as described above, there is a restriction that the outer plate 6 and the inner plate 7 must be assembled so that the slits 6b and 7b overlap each other, as shown in FIG. . This restriction exists because the viscosity of the viscous fluid is extremely high at about 100,000 csT, so when the outer plate 6 and the inner plate 7 are assembled with the slits 6b and 7b at different positions. This is because almost no passage for the viscous fluid to infiltrate into the working chamber 5 is formed, so the injection of the viscous fluid into the working chamber 5 does not go as planned and the time required for injection becomes long.

Therefore, conventionally, in order to speed up the injection time of viscous fluid into the fluid coupling, it is necessary to assemble the outer plate 6 and the inner plate 7 in advance so that the slits overlap with each other, which requires a lot of assembly work. There was a problem in that the amount increased significantly.

The present invention has focused on the above-mentioned problem, and aims to provide a viscous fluid injection device that can shorten the injection time of viscous fluid into a fluid coupling without aligning the slits between the outer plate and the inner plate. purpose.

[Means to solve the problem]

A viscous fluid injection device of the present invention that meets this objective includes an outer plate that is engaged with an outer case and has a plurality of slits, and an inner plate that is engaged with an inner shaft that is rotatably held by the outer case and has a plurality of slits. A viscous fluid injection device that injects viscous fluid into a working chamber of a fluid coupling in which plates and plates are housed in a mutually overlapping state, and the injection pressure of the viscous fluid injected into the working chamber is detected. A pressure detecting means, and a positioning means for rotating the inner shaft when injecting the viscous fluid and stopping the rotation of the inner shaft at a position where the injection pressure detected by the pressure detecting means is minimum. Become.

[Effect]

In the viscous fluid injection device configured in this way, the inner shaft is rotated by the positioning means when injecting the viscous fluid, and the rotation of the inner shaft changes the overlapping state of the slits in the outer plate and the slits in the inner plate. do.

This change in the overlapping state can be interpreted as a change in the injection pressure detected by the pressure detection means. That is, when the viscous fluid easily enters the working chamber of the fluid coupling, the injection pressure is low, and when the viscous fluid does not easily enter the working chamber, the injection pressure becomes high.

Therefore, when the injection pressure detected by the pressure detection means is minimum, the viscous fluid is most likely to enter the working chamber of the fluid coupling, and if the rotation of the inner shaft is stopped at this position, the inner shaft can be stopped in a short time. A viscous fluid can be injected into the fluid coupling.

〔Example〕

Below, preferred embodiments of the viscous fluid injection device according to the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the invention. In the figure, 21
2 shows a stand on which the fluid coupling 1 shown in FIG. 2 is placed, and the stand 21 is fixed to a base 22. The case 2 in which the fluid coupling 1 is mounted is held non-rotatably by a holding part 23 fixed to a base 22.

A vacuum pump 25 is connected to one injection port 2e of the fluid coupling 1 via a pipe 24. A pulp 26 is interposed in the middle of the pipe 24. A fluid pressure feeding means 2 is connected to the other injection port 2e of the fluid coupling 1 via a pipe 27.
8 are connected. The fluid pressure feeding means 2B is a cylinder 2
9, a piston 30, and a 7 cutuator 31. The piston 30 is slidably fitted into the cylinder 29 , and the piston 30 is moved within the cylinder 29 by an actuator 31 . A pulp 32 is interposed in the pipe 27.

Between the pulp 32 of the pipe 27 and the fluid pressure feeding means 28,
A pipe 34 is connected via a pulp 33, and this pipe 34 is connected to a replenishment tank 35. The supply tank 35 stores a viscous fluid. Note that the procedure for replenishing the viscous fluid from the replenishment tank 35 to the fluid pressure feeding means 28 is similar to the conventional apparatus shown in FIG.

Upstream of the pulp 32 of the piping 27, a pressure detection means 40 is provided to detect the injection pressure of the viscous fluid injected into the working chamber 5 of the fluid coupling 1. The pressure detection means 40 converts the injection pressure into an electrical signal, and the signal is input to a control section 42 described later.

The inner shaft 3 of the fluid coupling 1 is connected to a positioning means 41 for positioning the inner shaft 3 during injection of viscous fluid.
2, a connecting shaft 43, a motor 44, and a rotary encoder 45. The connecting shaft 43 has one end connected to the inner shaft 3 of the fluid coupling 1,
The other end is connected to the output shaft of the motor 44. The rotary encoder 45 is directly connected to a motor 44 that is rotationally driven by a signal from the control unit 42, and detects the amount of rotation (rotation angle) of the inner shaft 3.

The amount of 30 rotations of the inner shaft is determined by the rotary encoder 45.
The information is input to the control section 42 via the control section 42.

The motor 44 that rotationally drives the inner shaft 3 is stopped from rotating by the control unit 42 when the injection pressure detected by the pressure detection means 40 at the time of injection of the viscous fluid becomes the minimum, and the inner shaft 3 is moved to that position. It is designed to be held at The control unit 42 includes a pressure detection means 40
Inner shaft 3 position when the injection pressure detected by is the minimum! (rotation angle) with rotary encoder 45
It is designed to be read through.

Next, the operation of the above viscous fluid injection device will be explained.

First, while the pulp 32 of the fluid pressure feeding means 28 is closed, the pulp 26 on the vacuum pump 25 side is opened, and the vacuum pump 25 causes the working chamber 5 of the fluid coupling 1 to
A vacuum is drawn inside. When the evacuation is completed, the pulp 26 is closed, and then the pulp 32 is opened.

Then, by actuating the actuator 31, the cylinder 2
The viscous fluid stored in the fluid joint 9 is injected into the working chamber 5 of the fluid coupling 1. At the same time, the inner shaft 3 of the fluid coupling 1 is rotationally driven by the motor 44.

The injection pressure of the viscous fluid injected into the fluid coupling 1 is detected by the pressure detection means 40. When the inner shaft 3 is rotationally driven by the motor 44, the slit 6b of the outer plate 6 of the fluid coupling 1 and the inner Since the overlapping state of the slits 7b of the plate 7 changes, the injection pressure also changes based on this. In other words, in the overlapping state of both plates where viscous fluid easily flows into the working chamber 5,
Injection pressure decreases. Then, at the rotational position of the inner shaft 3 where the injection pressure detected by the pressure detection means 40 is the minimum, the motor 44 is stopped by the control unit 42, and the inner shaft 3 is locked at this position. The control unit 42 stores the rotational position of the inner shaft 3 at the time when the injection pressure of the viscous fluid drops the most based on the signal from the pressure detection means 40 and the signal from the low reencoder 45. Even if the stop position of the inner shaft 3 deviates, the position can be corrected.

Therefore, the accuracy of the stopping position of the inner shaft 3 is increased, and the inner shaft 3 is reliably fixed at a position where the viscous fluid is most easily injected.

In this way, even if the slit 6b of the outer plate 6 and the slit 7b of the inner plate 7 of the fluid coupling 1 are not aligned as shown in FIG. It becomes possible to find a position where the size is small, and it becomes possible to significantly shorten the injection time of the viscous fluid into the fluid coupling 1.

Note that in this embodiment, each valve 26, 32, and 33 is not controlled by the control unit 42;
If the control operation sequence of 6.32.33 is programmed into the control unit 42, the viscous fluid injection work can be automated.

〔Effect of the invention〕

As explained above, when using the viscous fluid injection device of the present invention, when injecting the viscous fluid into the fluid coupling, the alignment means rotates the inner shaft of the fluid coupling, and the viscous fluid is detected by the pressure detection means. Since the inner shaft is stopped at the position where the injection pressure is minimum, it is possible to inject the viscous fluid into the fluid joint at the position where it is easiest to inject, and the slit in the outer plate and the slit in the inner plate of the fluid joint can be injected. The time required to inject the viscous fluid into the fluid coupling can be shortened without performing alignment.

As a result, there is no need to align the slits of the inner plate and the slits of the outer plate when assembling the fluid coupling, and the number of man-hours required for assembling the fluid coupling can be significantly reduced.

[Brief explanation of the drawing]

1 is a schematic configuration diagram of a viscous fluid injection device according to an embodiment of the present invention; FIG. 2 is a sectional view of the fluid coupling in FIG. 1; FIG. 3 is a plan view of the outer plate in FIG. 2; FIG. 4 is a plan view of the inner plate in FIG. 2, FIG. 5 is a plan view showing the outer plate and inner plate in FIG. 2 overlapped, and FIG. 6 is a schematic configuration of a conventional viscous fluid injection device. Figure. ■...Fluid coupling 3...Inner shaft 5...Working chamber 6...Outer plate 6b...Slit 7... - Inner plate 7b...Slit 28...Fluid pressure feeding means 40...Pressure detection means 41...Positioning means L...Viscous fluid Patent applicant: Toyota Motor Corporation,

Claims (1)

[Claims] 1. A state in which an outer plate that is engaged with an outer case and has a plurality of slits and an inner plate that is engaged with an inner shaft that is rotatably held by the outer case and has a plurality of slits are overlapped with each other. A viscous fluid injection device for injecting a viscous fluid into a working chamber of a fluid joint housed in a fluid joint, the device comprising: a pressure detection means for detecting the injection pressure of the viscous fluid injected into the working chamber; A viscous fluid injection device comprising: positioning means for rotating the inner shaft and stopping rotation of the inner shaft at a position where the injection pressure detected by the pressure detection means is minimum.