JPH0492127A - Viscosity-joint oil filling device and method - Google Patents

Abstract

PURPOSE:To shorten a filling time by providing a pressure portion to pressurize oil at constant pressure and an oil path, connectable to an oil-filling opening, making up the oil path with branch passages on its way which have different distribution passages in cross section and are given specific passage open-close means, respectively. CONSTITUTION:Following that an air compressor 7 is actuated to thrust a pressure piston 8 in a pressure tank 9 at constant pressure, a timer is actuated to open shut-off valves 24, 25 in individual branch passages 20, 21. On this account, silicon oil flows from both branch passages 20, 21 through the oil-filling opening 36 of a viscosity joint 30 into a fluid room. The filling is nearly terminated in quantity and a revolution counter 12 is revolved to the threshold value of final flow, when the valve 24 in the branch passage 20 which has a larger flow area is closed to allow the filling only from the branch passage 21 which has a smaller flow area. Then, at the time of the revolution to the final set value, the remaining valve 25 is also closed. The filling is from both branch passages 20, 21 at the beginning, therefore to shorten a filling time.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an injection device and an injection method for injecting high viscosity oil into the fluid chamber of a viscous joint, which is a component of a power transmission system of a vehicle, for example. Regarding.

(Prior art) Viscous joints, which are conventionally used as components of vehicle differentials, have a plurality of inner plates and outer plates arranged in alternate layers within a fluid chamber filled with highly viscous oil. However, by attaching one plate to the driving member and the other plate to the driven member, rotational torque is transmitted from the driving member to the driven member via the high viscosity oil in the fluid chamber. Here, the amount of high viscosity oil filled in the fluid chamber is one of the major factors that determines the torque transmission characteristics, and is always a certain percentage of the empty fluid chamber capacity that has been precisely measured in advance (for example, 90
%~95%) of oil must be injected. That is, when this injection amount is large, the transmitted torque value at normal temperature becomes numerically high, and when it is small, the torque value at normal temperature becomes low. Also, after a predetermined proportion of oil is injected, the remaining portion within the fluid chamber contains air, and this air acts to absorb when the oil becomes hot and expands during operation. If the air content is small, the internal pressure tends to increase, which greatly affects the torque transmission characteristics at high temperatures.

Therefore, as a conventional injection method in which oil is injected while precisely controlling the amount of oil to be injected, the present applicant has proposed, for example, JP-A-60-40
A method similar to No. 725 is proposed. According to this, when injecting oil from the oil injection opening of a fluid coupling, the oil injection amount is controlled by pulses using a pressurized tank that supplies oil at a constant pressure and an oil injection device equipped with a single oil passage. By adjusting the amount of oil according to the volume of the space in the fluid chamber, the torque characteristics are made uniform.

(Problem to be solved by the invention) However, in the case of conventional devices and methods, there is only a single passage for the oil to be injected, so it is possible to solve the two problems of shortening the injection time and precisely controlling the filling amount. I couldn't do anything to satisfy him. In other words, if you increase the passage area in an attempt to shorten the injection time, the error in the filling amount will increase due to the timing difference when the oil passage is shut off, and conversely, if you try to precisely control the filling amount, you will have to make the passage area smaller. This means that the injection time will be longer.

(Means for Solving the Problem) In order to solve the problem, the present invention provides a pressurizing section that pressurizes oil at a constant pressure, an oil passage connectable to an oil injection opening, and a branch in the middle of the oil passage. A plurality of branch passages with different flow passage cross-sectional areas were provided. Each branch path was equipped with its own path opening/closing means.

In addition, in the oil injection method for such a device, all branch passages are opened at the beginning of oil injection, and when a predetermined injection amount is obtained, the branch passages with a large cross-sectional area are closed and the passage is closed. The injection was made only through the branch path with a small cross-sectional area.

(Function) A plurality of branch passages are provided in the middle of the oil passage, each branch passage has a different flow passage cross-sectional area, and the oil injection amount can be made variable by controlling each branch passage with its own passage opening/closing means.

At the beginning of injection, the injection time is shortened by opening all the branch passages, and in the latter half of the injection, by injecting only from the branch passages with a small cross-sectional area, when the oil passage is blocked. It is possible to reduce the error in the filling amount due to the deviation.

(Example) An example of the oil injection device and injection method of the present invention will be described based on the attached drawings.

FIG. 1 is a general schematic diagram of an oil injection device, FIG. 2 is a flowchart showing an injection method, and FIG. 3 is an explanatory diagram of a viscous joint.

As shown in FIG. 3, the viscous joint 30 includes a shaft member 32 rotatably provided with respect to a case member 31, and is configured to transmit rotational torque between the case member 31 and the shaft member 32. . That is, a fluid chamber 33 is defined inside the substantially cylindrical case member 31, and a plurality of plates are arranged in a layered manner within this fluid chamber 33. In other words, the outer plate 34 spline-coupled to the inner circumferential spline portion 31a of the case member 31 and the inner plate 35 spline-coupled to the outer circumferential spline portion 32a of the shaft member 32 are arranged alternately, and each plate 34, 35 is not provided. The illustrated plurality of holes are drilled, and silicone oil with a high viscosity of, for example, about 150,000 cst is sealed in the fluid chamber 33. An oil injection opening 35 is provided at one end of the side surface of the case member 31, and a through hole 37 for evacuating the air in the fluid chamber 33 at the time of oil injection is provided at the other end.

Such a viscous joint 30 can rotate the case member 31 side via the plate 34, 35 in the fluid chamber 33 and viscous oil by rotating the shaft member 32 side as the drive side, for example, and transmit torque. However, it is known that the torque transmission characteristics change greatly depending on the ratio between the amount of oil filled in the fluid chamber 33 and the capacity inside the fluid chamber in an empty state before oil is injected, that is, the volume ratio. ing. Therefore, when injecting oil, it is important to delicately control the injection amount and achieve a precise volume ratio.

The oil injection device 1 of the present invention is provided as a device for injecting oil into the fluid chamber 33 of the above-mentioned viscous joint 30, as shown in FIG. 9, a pressurizing section 6 consisting of a near compressor 7, a pressurizing piston 8, a pressurizing tank 9, etc., a flow meter 11, and an integrating unit with temperature correction. counter 12,
It is composed of an injection control section including a CPU (not shown), an injection jig main body 13 capable of clamping the viscous joint 30, a vacuum pump 14 for evacuating the air in the fluid chamber, and the like.

In other words, the pressurizing section 6 is configured to pressurize the fed oil to a constant pressure by the near compressor 7 and the pressurizing piston 8, and the oil passage between the pressurizing section 3 and the pressurizing section 6 is equipped with a check to prevent backflow. A valve 15 is provided, and
A resistance temperature detector 16 and a flow meter 11 are provided in the oil passage between the pressurizing part 6 and the injection jig main body 13 to send data signals of oil temperature and flow rate to an integration counter 12 with temperature correction. .

On the other hand, the oil passage 18 of the injection jig main body 13 is configured to be able to branch into two branch paths 20 and 21, then join together, and then communicate with the oil injection opening 36 of the viscous joint 30. The cross-sectional areas of the branch passages 20 and 21 are different, with one branch passage 20 having a larger area and the other branch passage 21 having a smaller area. Also, each branch road 20, 2
1 are provided with shutoff valves 24, 25 operated by respective solenoids 22, 23, and controlled by a signal from the temperature-compensated integration counter 12.

This temperature-compensated integration counter 12 is configured to add the pulses when it receives a flow rate signal, for example, a voltage pulse output from the flow meter 17 mentioned above, and actuate the solenoids 22 and 23 when the set pulse is reached. There is.

On the other hand, a vacuum retaining seal 26 is attached to the other side of the fluid chamber and connected to the vacuum pump 14.

The Oil Registration Law for oil injection devices with such a configuration is referred to in the second article.
This will be explained using figures.

First, the viscous joint 30 as a workpiece is set in the injection jig main body 13, and the workpiece is clamped. Next, vacuum pump 1
4 is activated temporarily to check the seal pressure of the vacuum holding seal 26, and if there is no air leakage and the pressure test is passed, the process proceeds to the next step. That is, the near compressor 7 operates to push the pressurizing piston 8 in the pressurizing tank 9 at a constant pressure, and then the timer operates to push the pressurizing piston 8 in each branch path 2.
021 shirt 1 to off valve 24.25 are opened.

For this purpose, silicone oil flows from both branches 20.21 via the oil injection opening 36 of the viscous coupling 30 into the fluid chamber. As the filling amount approaches the end, the integration counter 12
When the flow rate is integrated up to the final flow rate limit value, the shutoff valve 24 on the side of the branch passage 20 having a large passage area is closed, and injection is performed only from the side of the branch passage 21 having a small passage area. In other words, since the injected oil is pressurized at a constant pressure, the flow rate (injection amount) is reduced by the reduction in the cross-sectional area of the flow path (the moving speed of the pressurizing piston 8 is slowed).

). When the final set value is accumulated, the remaining shutoff valves 25 are also closed. At this time, the final set value is set in advance in anticipation of a slight amount of overshoot that is injected due to inertia even after the valve 25 is closed.

In addition, since the flow path area of the branch passage 21 where injection is finally performed is small, there is little error in the injection amount due to timing deviation when shutting off the shut-off valve, and conventionally, for example, ±0 with respect to the set injection amount. The variation in injection amount, which was about .52 cc, can be suppressed with an accuracy of about ±0.135 cc. Moreover, since the injection is initially performed from both branch paths 20 and 21, the injection time is also shortened.

Next, the pressurization in the pressurizing tank 9 is stopped, and after the work clamp is depressurized, the operation of the vacuum pump 14 is stopped. At this time, the reason why the operation of the vacuum pump 14 is continued until the final stage is to prevent liquid from dripping from the oil injection opening 36 on the lower surface when the pressure is reduced by clamping the workpiece. The oil injection opening 36 of the viscous joint 30 after the injection is sealed with a sealing screw, and the through hole 37 used for vacuuming is press-fitted with a hole and sealed. Note that the number of branch roads is arbitrary.

(Effects of the Invention) As described above, the oil injection device and injection method of the present invention are as follows:
Compared to the conventional method where the injection speed is constant and controlled by the car's valve, there is less error in the set injection amount, reducing the failure rate in quality inspections such as torque inspections performed after filling the oil. I can force it.

Furthermore, there is an effect that the injection time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a general schematic diagram of an oil injection device, FIG. 2 is a flowchart showing an injection method, and FIG. 3 is an explanatory diagram of a viscous joint. In the figure, 1 is the oil injection device, 2 is the main tank, and 6 is the oil injection device.
9 is a pressurizing section, 9 is a pressurizing tank, 11 is a flow meter, 12 is an integration counter with temperature correction, 14 is a vacuum pump, 18 is an oil passage, 20.21 is a branch path, 24.25 is a shut-off valve, 30 33 is a fluid chamber, and 36 is an oil injection opening.

Claims (2)

[Claims] (1) An oil injection device for injecting oil into the fluid chamber of a viscous joint. 1. An oil injection device for a viscous joint, characterized in that a plurality of branch passages having different cross-sectional areas are provided by branching in the middle, and each branch passage is provided with its own passage opening/closing means. (2) In the oil injection method for the above-mentioned device, this method opens all the passages of each branch passage at the beginning of oil injection, and from the time when a predetermined injection amount is obtained, the branch passage with a large flow passage cross-sectional area is opened. A method for injecting oil into a viscous joint, characterized in that the oil is injected only from a closed branch path with a small cross-sectional area.