JPS629780B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an actuation control device for a clutch for a fluid torque converter used primarily in a vehicle transmission.

Conventionally, as a clutch for this type of fluid torque converter, for example, according to US Pat. a turbine impeller connected to the output side connected to the drive wheels of the vehicle in the internal cavity;
A clutch plate is provided between the turbine impeller and the input case, and the clutch plate is movable in the axial direction and can be freely engaged and disengaged from the input case in response to a fluid pressure difference acting on both sides of the clutch plate. , the clutch plate and the turbine blade wheel are connected so as to be relatively rotatable via a damper spring, and the clutch plate is engaged with the input case during high-speed cruising, etc., and the input shaft → input case → clutch plate → Mechanical torque transmission in the damper spring → turbine wheel → output shaft system enables efficient torque transmission that prevents slippage in the fluid torque converter, and torque fluctuations are suppressed by the expansion and contraction operation of the damper spring. Although it is known that torque fluctuations can be prevented from being transmitted between the input and output shafts by absorbing them, this method has the disadvantage that it is difficult to absorb torque fluctuations in a region where the engine drive torque is small.

To explain this in detail, the damper spring has a relatively high spring constant so as to be able to absorb torque fluctuations in a region where the driving torque is large, and to absorb torque fluctuations in a region where the driving torque is small. Even though the ratio of the torque fluctuation width to the steady torque increases, the spring is not given sufficient expansion and contraction action corresponding to this, making it difficult to absorb torque fluctuations.

Therefore, in order to eliminate such inconveniences, the applicant of the present application proposed in Japanese Patent Application No. 57-107675 that a communication hole is provided in the clutch plate that communicates between both sides of the clutch plate, and a communication hole that communicates with the clutch plate in the reverse direction of the turbine blade wheel. An on-off valve that opens and closes the communication hole in response to rotation is provided,
In a region where the drive torque is small and the amount of relative rotational displacement in the reverse direction of the turbine wheel is small, the communication hole is opened and fluid leaks from there, thereby reducing the fluid pressure difference between both sides of the clutch plate. The engagement force of the clutch plate is weakened to make it more likely to slip, and torque fluctuations in the area where the clutch plate slips can be effectively absorbed, and in the area where the displacement is large and the drive torque is large, An operation control device for a clutch for a fluid torque converter has been proposed in which the communication hole is closed to strengthen the engagement force of the clutch plate, and the clutch plate is directly connected to prevent slippage, thereby improving torque transmission efficiency. If this continues, when the clutch plate is engaged, the accelerator pedal is strongly depressed to accelerate suddenly, and the turbine wheel rotates significantly in the reverse direction, causing the damper spring to become almost completely compressed. The opening/closing valve closes the communication hole and the clutch plate becomes directly connected, and the sudden torque change due to sudden acceleration is directly transmitted to the output side.Furthermore, the input and output shafts are directly connected mechanically, resulting in acceleration. It also comes with the inconvenience of worsening sex.

An object of the present invention is to provide a device in which the above-mentioned disadvantages are solved by allowing the communication hole to be opened not only in a region of small driving torque but also during sudden acceleration, and which is different from the above-mentioned previous proposal. characterized in that the on-off valve is configured to close the communication hole within a predetermined range of relative rotational displacement in the reverse direction of the turbine impeller, and open the communication hole in areas smaller and larger than the range. do.

Next, the present invention will be explained with reference to the illustrated embodiments.

In the drawings, reference numeral 1 denotes a fluid torque converter main body having an input shaft 2 connected to the engine and an output shaft 3 connected to the drive wheels and other loads of the vehicle on the same axis at the front and rear. The output is provided in an internal space 6 surrounded by the input case 4 and the pump impeller 5, and includes a front input case 4 connected to the input case 4 and a rear pump impeller 5 connected to the input case 4. a turbine wheel 7 connected to the shaft 3; a stator wheel 8 between the turbine wheel 7 and the pump wheel 5;
The rotation of the input shaft 2 circulates internal fluid between the impellers 5, 7, and 8 to provide fluid torque transmission to the output shaft 3, and the turbine A clutch plate 9 movable in the axial direction is provided between the impeller 7 and the input case 4,
The clutch plate 9 is connected to the input case 4 via a damper spring 10 and connected to the turbine blade wheel 7 via a damper spring 10. It is assumed that the wheel 7 is connected to the output shaft 3, and thus, according to the engagement of the clutch plate 9 with the input case 4, the input shaft 2 → input case 4 → clutch plate 9 → damper spring 10 → turbine Impeller 7 → Output shaft 3
Mechanical torque transmission is provided in the system.

In addition to what is shown in the drawings, to explain this in more detail, the clutch plate 9 has a rear side surface that receives the fluid pressure in the internal space 6, and a front surface that stores the fluid pressure in the gap 11 between the clutch plate 9 and the input case 4. is actuated, the fluid pressure in the gap 11 is reduced by a fluid pressure control device (not shown) connected through the shaft hole 12 of the output shaft 3, and the forward movement is performed. The friction material 13 is frictionally engaged with the input case 4,
As shown in FIGS. 2 and 3, the damper spring 10 is composed of coil springs housed in an annular recess 9a on the rear surface of the outer periphery of the clutch plate 9 with gaps in the circumferential direction between them. A support piece 14 is attached to the clutch plate 9 for each spring 10 to prevent it from coming out inwardly, and the support piece 1
4, each spring 10 is also provided with input side retainers 15, 15 at both ends which are clamped via washers 10a, 10a' on both end faces thereof, and furthermore, input side retainers 15, 15 are provided in the arrangement gap between each spring 10 from the turbine blade wheel 7 side. The output side retainer 16 that extends is inserted. In the drawings, reference numeral 9b indicates a guide plate provided within the recess 9a to facilitate the expansion and contraction of each spring 10.

Here, assuming that the driving rotation direction of the engine, that is, the forward rotation direction, is clockwise in FIG. Causes relative rotation. In this case, each spring 10 is compressed and deformed through the output side retainer 16 until elasticity is generated in accordance with the driving torque, and thus the relative rotation of the turbine wheel 7 in the counterclockwise direction is applied. The amount of rotational displacement increases according to the driving torque.

Each spring 10 operates to absorb the torque fluctuation by expanding and contracting around a predetermined compression displacement position according to the driving torque when the torque fluctuates. In order to prevent this from compressing to the maximum compression position in a steady state and being unable to absorb subsequent torque fluctuations, a spring with a relatively high constant is used, so torque fluctuations can be sufficiently absorbed in regions where the drive torque is small. It becomes impossible.

Therefore, a communication hole 1 is provided in the clutch plate 9, which communicates between both sides of the clutch plate 9, as shown in FIGS. 1 and 2.
7 and an on-off valve 18 that opens and closes the communication hole 17 in response to relative rotation of the turbine impeller 7 with respect to the clutch plate 9 in the reverse direction, that is, in the counterclockwise direction. The on-off valve 18 is configured to close the communication hole 17 within a predetermined range of relative rotational displacement of the clutch plate 9 in the counterclockwise direction, and open the communication hole 17 in areas smaller and larger than the range. .

In the illustrated example, the opening/closing valve 18 is constituted by a radially elongated rocking member 19 pivotally connected to the clutch plate 9, with a portion of the rocking member 19 extending radially inward from the pivot shaft 20. It is composed of an elastic piece 19a, whose radially inner end portion is brought into elastic contact with the clutch plate 9, and the inner end portion constitutes a valve portion 21 that opens and closes the communication hole 17. The outer end in the radial direction is located on the counterclockwise side of the arrangement position of one of the damper springs 10, and the connecting pin 22 is implanted in the outer end, so that the relative rotation of the turbine wheel 7 in the counterclockwise direction is achieved. The washer 10a on the clockwise end face of the spring 10 that the output side retainer 16 provided on this comes into contact with.
Piano wire 23 as a continuous rod extending counterclockwise to
is fixed, and the tip of the piano wire 23 is attached to the pin 22.
According to the relative rotation of the turbine wheel 7 in the counterclockwise direction, the swinging member 19 is rotated about the pivot shaft 20 via the output side retainer 16, the washer 10a, and the piano wire 23. The valve portion 21 is swung counterclockwise so that a swiveling displacement is applied to the valve portion 21 in the direction of closing the communication hole 17.

Then, the amount of rocking displacement of the valve portion 21 determined by the ratio l ₁ /l ₂ of the distances l ₁ and l ₂ between the valve portion 21 and the connecting pin 22 from the pivot 20 is determined by the turbine impeller 7 The width increase rate with respect to the relative rotational displacement amount and the plate width of the valve portion 21 are set appropriately, and in a predetermined range of the relative rotational displacement amount of the turbine impeller 7, the communication hole 1 as shown in FIG.
7 is closed, and the communication hole 17 is opened in a region smaller or larger than the above range as shown in FIGS. 4a and 4c. Note that the piano wire 23 is connected to the washer 10 on the counterclockwise end surface of the spring 10.
a' and the guide member 24 so that it is guided by these and moved in the circumferential direction, and the piano wire 23 is wound around the connecting pin 22 so as to be allowed to move in the axial direction. Stop the spring 10
Even if the washer 10a floats from the clutch plate 9, this movement is prevented from being transmitted to the swinging member 19.

In addition, in the illustrated piano wire 23, the washer 1
Although it is fixed at 0a, it is of course possible to fix it to the output side retainer 16, and furthermore, the on-off valve 18 may be constructed of a sliding member that is connected to the turbine impeller 7 and slides on the clutch plate 9. is also possible.

Next, the operation of the present invention will be explained. When the clutch plate 9 is engaged, the turbine wheel 7 rotates relative to the clutch plate 9 in a reverse direction, that is, in a counterclockwise direction, in accordance with the driving torque. With the relative rotation, the on-off valve 18 is operated in the direction of closing the communication hole 17, but in a region where the relative rotational displacement is small and the drive torque is small, the communication hole 17 is still open as shown in FIG. 4a. The fluid leakage through the communication hole 17 reduces the fluid pressure difference between both sides of the clutch plate 9, weakening the engagement force of the clutch plate 9, and thus the torque fluctuation in this region is reduced. When the relative rotational displacement is effectively absorbed by the slippage of the clutch plate 9 and then increases due to an increase in driving torque, the communication hole 17 is closed by the opening/closing valve 18 as shown in FIG. The engagement force of the plate 9 is strengthened, torque is transmitted in a direct mechanical connection state, and torque fluctuations are absorbed by the damper spring 10.

The above is similar to the above-mentioned proposal, but according to the present invention, the turbine wheel 7 compresses the spring 10 almost completely due to sudden acceleration.
When a large relative rotation occurs, the communication hole 17 is opened again as shown in FIG. Slip occurs, and this slip prevents the occurrence of acceleration shock due to the transmission of sudden torque changes due to sudden acceleration to the output side, and the torque amplification function of the fluid torque converter by the amount of slip is achieved by the fluid torque transmission. acceleration is improved.

As described above, according to the present invention, the on-off valve is connected to the connecting rod extending counterclockwise from one end of the damper spring in the clockwise direction, and the communicating hole is closed within a predetermined range of relative rotational displacement of the turbine wheel. The communication hole is configured to be opened in a smaller or larger area, so that torque fluctuations in a small drive torque area can be absorbed by slippage of the clutch plate, and the large Relative rotation also causes the clutch plate to slip, which has the effect of preventing the occurrence of acceleration shock and improving acceleration performance.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of one example of the device of the present invention;
The figure is a rear view of the clutch plate taken along the - line in Figure 1, Figure 3 is a side view taken along the - line in Figure 2, and Figures 4 a, b, and c are rear views of the clutch plate explaining its operation. It is. DESCRIPTION OF SYMBOLS 1... Fluid torque converter main body, 2... Input shaft, 3... Output shaft, 4... Input case, 5... Pump impeller, 6... Internal gap, 7... Turbine impeller, 9... Clutch Plate, 10... Damper spring, 17... Communication hole, 18... Open/close valve.

Claims (1)

[Claims] 1. A turbine impeller connected to an output shaft in an internal gap of a fluid torque converter main body surrounded by an input case on one side connected to the input shaft and a pump impeller on the other side connected to the input case; a clutch plate between the turbine wheel and the input case;
The clutch plate is movable in the axial direction and can be freely engaged and disengaged from the input case in response to a fluid pressure difference acting on both sides of the clutch plate, and the clutch plate and the turbine wheel are rotated relative to each other via a damper spring. A communication hole that communicates between both sides of the clutch plate, and an on-off valve that opens and closes the communication hole in response to relative rotation of the turbine impeller in a reverse direction with respect to the clutch plate. In what is provided,
The opening/closing valve is connected to a connecting rod of the damper spring extending from a clockwise direction to a counterclockwise direction to close the communication hole within a predetermined range of relative rotational displacement in a reverse direction of the turbine impeller, and an area smaller than the range. An operation control device for a clutch for a fluid torque converter, characterized in that the communication hole is opened in a large area.