JP2769032B2 - Oil injection method for viscous joints - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling a fluid chamber of a viscous coupling used as a component of a power transmission system of a vehicle with a predetermined amount of oil with high precision. .

(Prior Art) Conventionally, for example, a viscous joint used as a component of a vehicle differential or the like has a plurality of inner plates and outer plates alternately arranged in a layered manner in a fluid chamber filled with high-viscosity oil. , One of the plates as a drive member,
The other side plate is attached to the driven member so that the rotational torque is transmitted from the driving member to the driven member via the high-viscosity oil in the fluid chamber. Here, the filling amount of the high-viscosity oil in the fluid chamber is one of the major factors that determine the torque transmission characteristics, and is always a constant ratio amount (for example, a predetermined amount) to the capacity of the empty fluid chamber that is precisely measured in advance. 90% ~
95%) oil needs to be injected. That is, when the injection amount is large, the transmission torque value at normal temperature generally increases, and when the injection amount is small, the torque value at normal temperature decreases. After the oil is injected at a predetermined ratio, the remaining portion of the fluid chamber contains air, which is used to absorb air when the oil becomes hot during operation and expands. If the content is small, the internal pressure tends to increase, and the torque transmission characteristics at high temperatures are greatly involved.

Therefore, the present applicant has already proposed an oil injection method as disclosed in, for example, JP-A-64-46024 or JP-A-64-40725. In each of these methods, the temperature of the oil is measured and a correction value based on the difference from the reference temperature is calculated to adjust the injection amount, or the injection amount is adjusted according to the variation in the volume of the fluid empty space. Or Trying to keep constant.

(Problems to be Solved by the Invention) However, even if the volume of the fluid chamber is individually measured before oil injection and the oil filling amount is individually set and injected as in the conventional case, the oil is injected into the oil at the time of injection. If air is mixed in, an error occurs in the filling amount, and the subsequent quality inspection such as a torque inspection fails. And, even if the error of the filling amount is, for example, about 0.5 CC, the inspection may be rejected. Therefore, it is desirable to eliminate air mixing during injection as much as possible.

On the other hand, in order to prevent air from being mixed into the oil, for example, care must be taken not to gently bubble the oil when supplying the oil to the oil tank, or to completely seal the components such as the members that pump the oil. However, in the former case, the working time is increased and it is not practical, and in the latter case, there is a problem that the number of parts increases and the equipment cost rises.

(Means for Solving the Problems) In order to solve such problems, the present invention controls the volume of oil to be filled in the fluid chamber of the viscous joint by a set pulse value of a pulse counter combined with a flow meter. In the oil injection method, the empty weight before the oil is injected into the viscous joint and the filling weight after the injection are measured to determine the weight difference, and the average actual injection amount per unit pulse is calculated from the weight difference. The set pulse value for the injection was calculated.

(Operation) Since the air contained in the oil is expected to be present in a substantially uniform state, the actual injected amount is calculated by dividing the actually injected oil weight by the specific gravity of the oil, and the set number of pulses at that time To obtain the average actual injection volume per unit pulse,
If this is used for the subsequent setting pulse value calculation, the injection amount in the subsequent injection can be optimized.

(Example) An example of the oil injection method for a viscous joint of the present invention will be described with reference to the accompanying 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 the case member 31.
The rotation torque is transmitted between the shaft member 32 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 disposed in the fluid chamber 33 in a multilayered manner. That is, an outer plate 34 that is spline-coupled to the inner spline portion 31a of the case member 31 and an inner plate 35 that is spline-coupled to the outer spline portion 32a of the shaft member 32 are alternately arranged. Are formed in the fluid chamber 33, and high-viscosity silicone oil of, for example, about 150,000 cst is sealed in the fluid chamber 33. An oil injection opening 36 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 is, for example, rotated by using the shaft member 32 side as a driving side, so that the plate 3 in the fluid chamber 33 is rotated.
The case member 31 is rotated via the viscous oil and the viscous oil 4 and 35 to transmit the torque.

On the other hand, as shown in FIG. 1, the oil injection device 1 is provided as a device for injecting oil into the fluid chamber 33 of the above-mentioned viscous coupling 30, and transfers the oil stored in the main tank 3 to the pressurized tank 9. A pressure feeding unit 3 including a gear pump 4 and a gear motor 5 for feeding the air, a pressurizing unit 6 including an air compressor 7, a pressurizing piston 8, a pressurizing tank 9, a flow meter 11, an integrating counter 12 with temperature correction, and the like. , An injection control unit including a CPU (not shown), an injection jig body 13 capable of clamping the viscous joint 30, a vacuum pump 14 for evacuating air in the fluid chamber, and the like. A check valve 15 for preventing backflow is provided in an oil passage between the pressure feeding unit 3 and the pressurizing unit 6, and a temperature measuring resistor 16 is provided in an oil passage between the pressurizing unit 6 and the injection unit 13. The data signal of the oil temperature measured by the arrangement is sent to the counter 12 with temperature correction, and the data of the flow rate detected by the flow meter 11 is sent to the counter 12 with temperature correction by a pulse signal.

On the other hand, the oil passage 18 provided in the jig body 13 branches into two branch passages 20 and 21 having different flow passage cross-sectional areas, and each branch passage has its own solenoids 22 and 23 and shut-off valves 24 and 21. twenty five
Is provided. And each of these shut-off valves
24, 25 can be controlled by a signal from the integrating counter 12 with temperature correction. That is, the temperature-correcting integrating counter 12 is configured as a pulse addition type, and a pulse value is set in advance based on the oil amount per pulse, and the flow meter 11
When the pulse sent from the controller reaches the set pulse value, the solenoids 22 and 23 are operated to close the valves 24 and 25. Note that a vacuum holding seal 26 is attached when vacuuming is performed by the vacuum pump 14.

The outline of oil injection by such a device is as follows.

First, the viscous joint 30 as a work is set on the injection jig body 13, and the work is clamped. Next, after the vacuum pump 14 is temporarily operated to check the seal of the vacuum holding seal 26, the pressurizing section 6 pressurizes and injects oil. That is, the pressurizing piston 8 is driven by the air compressor 7 to pressurize the oil. For this reason, the oil flows through the flow meter 11 from each of the branch passages 20 and 21 to the oil injection opening 3.
It flows toward 6 and is injected into the fluid chamber 33. When the integration counter 12 receives the pulse signal from the flow meter 11, when reaching a predetermined pulse value, the integration counter 12 first has a branch path 20 having a large flow path cross-sectional area.
A signal for closing the side shutoff valve 24 is issued, and injection is performed only from the branch 21 having a small flow path cross-sectional area.

Next, when it is added up to the final set pulse value, the shutoff valve 25 side of the branch path 21 is also closed, and the predetermined injection is completed. The injection method of the present invention is characterized by the setting of the pulse value. Hereinafter, the method of setting the pulse value will be described with reference to FIG.

The dry weight of the assembled viscous joint 30 (indicated by VC in the flowchart) is measured, and then the volume of the fluid chamber 33 is measured by a volume measuring device (not shown). Therefore, a predetermined oil injection amount for obtaining a required volume ratio (for example, 95%) is calculated, and a set pulse value is obtained according to the oil amount per unit pulse. Here, the set pulse value is a value obtained by dividing the set injection amount by the reference oil amount per pulse in the related art, but in the case of the present invention, the actual injection amount per pulse already obtained by the actual injection is used. Use the data. That is,
The actual injection amount (CC) of the viscous joint already injected is divided by the set pulse at that time to obtain the pulse coefficient (average actual injection amount per pulse), and the set injection amount is divided by this pulse coefficient to obtain the set pulse value. Used. For this reason, of course, the air coefficient at the time of the injection is taken into account in the pulse coefficient,
For the subsequent viscous joint, the injection is performed in consideration of the air dust. Further, in one specific work form of injection work or a specific injection device, the amount of air contained in the oil is expected to be a certain value. For example, when oil is supplied to an oil tank or when oil is fed under pressure, it is possible to allow a small amount of air to be mixed in and quickly process the oil.

When the oil is injected in this way, the weight of the filled viscous joint 30 is measured to determine the volume ratio. That is, the actual injection amount is obtained from the weight difference and the specific gravity of the silicone oil, and it is determined whether a desired volume ratio is obtained. If it is outside the predetermined range, the amount of silicone oil is readjusted.If it is within the predetermined range, the sealing bolt is tightened and sealed in the oil injection opening 36, and a steel ball is inserted into the evacuated through hole 37. Press and caulk. By doing so, the injection accuracy can be increased more than ever before, and the work can be processed quickly.

(Effect of the Invention) As described above, in the oil injection method for a viscous joint according to the present invention, the injection amount is set in advance in a state where the amount of air contained in the oil is anticipated. It can be an amount.

Further, even if a small amount of air is mixed, the injection can be performed in a state where the influence is removed, so that the operation can be performed quickly.

[Brief description of the drawings]

FIG. 1 is a general schematic diagram of an oil injection device, FIG. 2 is a flowchart showing injection, and FIG. 3 is an explanatory diagram of a viscous joint. In the figure, 1 is an oil injection device, 11 is a flow meter, 12 is an integrating counter with temperature correction, 14 is a vacuum pump, 22 and 23 are solenoids, 24 and 25 are shut-off valves, 30 is a viscous coupling, 33
Denotes a fluid chamber, and 36 denotes an oil injection opening.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shugo Kondo 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (56) References JP-A-64-46024 (JP, A) JP-A-64-40725 (JP, A) JP-A-63-232192 (JP, A) JP-A-61-286624 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16D 35 / 00

Claims (1)

(57) [Claims] An oil filling method in which the volume of oil filled in a fluid chamber of a viscous joint is controlled by a set pulse value of a pulse counter combined with a flow meter, the method comprises: The empty weight before injection and the filling weight after injection are measured, and the average actual injection amount per unit pulse is calculated from the difference in weight. Based on the average injection amount per unit pulse, the subsequent set pulse value Oil injection method for a viscous joint, wherein