JPS58193966A - Lock-up torque converter - Google Patents

Abstract

PURPOSE:To prevent the occurrence of backlash noises, by energizing a torsional damper by a resilient member such that the play at a driving joint portion of the torsional damper exists only in one direction of rotation. CONSTITUTION:The play in the direction of rotation at the driving joint portion of a torsional damper 7 and a lock-up clutch piston 5 exists only on the side opposite to the direction A in which a pawl 9a is energized, as shown by t'' in the drawing, and the pawl 9a is forced onto a side wall 5b' of a slor by means of a plate spring 12. Therefore, even if the engine torque or the speed of rotation of a turbine hub 8 is changed, the above positional relationship of rotation of the torsional damper 7 and the lock-up clutch piston 5 is not changed. Thus, it is enabled to prevent occurrence of backlash noises caused when the pawl 9a strikes against the side wall of the slot located on the opposite side of the side wall 5b'.

Description

[Detailed Description of the Invention] The present invention is automatic 1M! This relates to the repair of lock-up torque converters used in the power transmission system of aircraft.

A normal torque converter uses a pump impeller driven by an engine to generate a hydraulic oil flow, which rotates a turbine runner while increasing torque under the reaction force of the stator, and extracts power from the turbine runner. Since the power transmission is smooth, vibrations can be suppressed even when torque fluctuates, making it an essential component for automatic transmissions.

By the way, as mentioned above, in a normal torque converter, power is transferred from the pump impeller (input element) to the turbine launch (output element) via the working fluid, so slippage between these input and output elements is unavoidable, resulting in a loss of power. Poor transmission efficiency. Therefore, it does not cause torque fluctuation or vibration,
A so-called lock-up torque converter, which directly connects input and output elements in an operating range where this is rarely a problem, has been developed and is already in practical use in some areas.

This lock-up torque converter is usually shown in Figure 1 (a).
As shown in the figure, a lock-up clutch piston 6 is provided in a torque converter consisting of a pump impeller 1, a turbine runner 2, a stator 8, and a converter cover. Figure 1 (a) in the axial direction due to internal pressure.
By displacing it to the middle left, when the clutch facing Ba of the lock-up clutch piston b is brought into pressure contact with the lifter cover first, the engine power transmitted to the converter cover 4 is transferred to the torsional damper 7 and the turbine hub 8 (turbine runner 3). In other words, the torque converter can be directly connected without using a torque converter.

On the other hand, the torsional damping buff absorbs the silk fluctuation during power transmission in this direct connection state and suppresses the occurrence of vibration, and it is similar to the one often used in dry single-plate clutches. 10 and a torsion spring 1 inserted between these plates 9 and 10. Therefore, in order to enable the lock-up clutch piston to be displaced in the axial direction as described above, the conventional driven plate 0 is riveted to the turbine boss 8 together with the turbine runner 3 by a rivet 16. As shown in Fig. 81(b), the outer periphery of the piston is connected to the lock-up clutch piston b by engagement or serrations between the pawl 9a and the cutout groove 5b, so that the piston b can move relative to the lock-up clutch piston b by +2TllTh.

For this reason, lock-up torque converters are usually
As shown by t and t' in Figure (b), due to the clearance in the rotational direction of the drive coupling part, there is inevitable play in the rotational direction between the torsional damper 7 and the lock-up clutch piston 5, and the engine Is it a torsional damper due to torque drive or changes in the rotation of the turbine hub 8? A popping sound was occurring between the lock-up clutch piston 5 and the lock-up clutch piston 5.

In the present invention, a torsional damper is drive-coupled to a lock-up clutch piston or a turbine hub so that the axial displacement of the lock-up clutch piston becomes gJt#. The above configuration is based on the idea that if the energization is applied so that the power is applied only to the engine, the cracking noise will not occur due to engine torque fluctuations or rotational changes of the turbine hub, and the above problem can be solved. It is an object of the present invention to provide a lock-up torque converter with unique characteristics.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.

1st v:i (1!L) and mWJ(b) main departure 11-
1(L) and 1(b) in these figures.
) The same parts are indicated by the same reference numerals.

In the present invention, a leaf spring 2 is provided on the lock-up clutch piston, and this leaf spring is riveted to the lock-up clutch piston 5 with a rivet 18. Then, the tip of the leaf spring 1s is applied to the pawl 9a of the drive plate 9 from one side edge, and the preload of the leaf spring 1m causes the drive plate 9 to lock up against the clutch piston S in the direction of the arrow mark in FIG. 2(b). energize.

In such a lock-up torque converter, a torsional damper 7 and a pull-up clutch piston b
Figure 2(b) shows the play in the rotational direction at the drive coupling part of t.
As shown by ', the pawl 9a exists only on the side opposite to the urging direction M, and the pawl 9a is pressed against the notch wall Isb' by the leaf spring 11.

Therefore, even if the engine torque fluctuates or the rotation of the turbine hub 8 changes, the relative rotational positions of the torsional damper 7 and the lock-up clutch piston b do not become the same, and the pawl 9a is located in the notched groove @ wall opposite to the side wall ab'. It is possible to prevent backlash noise from occurring due to collision between the two.

To explain this action and effect in more detail, Fig. 6
In the conventional lock-up torque converter shown in W, the lock-up clutch piston b is fixed and the torsional damper 7 is twisted, and the torsional torque T with respect to the torsional angle 0 is
FIG. 7 shows the same change characteristics in the lock-up torque converter of the present invention shown in FIG.

In Fig. 6, Δθ is the lock-up clutch piston 5
and the relative torsional angle range corresponding to the backlash t + t' between the torsional damper 7, and on both sides of this range, the torsional torque T is equal to the composite spring constant kl of the torsion spring 11.
It changes with slope 1 determined by . Also, Δ in Figure 7
θ also indicates a relative torsional angle range corresponding to the backlash t' between the lock-up clutch piston S and the torsion damper, and in this range, the torsional torque T is
It changes with a gradient determined by kks. Incidentally, Δte indicates the torque generated by the molded spring 13.

As is clear from FIG. 6, in the conventional lock-up torque converter, the Δ-region torsional torque T is zero, so the lock-up clutch piston 6 and the torsional damper 7 are used to control engine torque changes and turbine Due to changes in the rotation of the hub 8, relative rotation is likely to occur, resulting in a sloshing noise. On the other hand, in the four-up torque converter of the present invention, the As is clear from W.J.
There is no region where the torsional torque τ becomes zero, and the lock-up clutch piston 6 and torsional damper do not rotate relative to each other even with engine torque changes and turbine hub 8 rotational changes, and backlash noise can be prevented from occurring.

In order to press the pawl 9a against the notch groove@wall 5b', instead of the leaf spring 12 of the above embodiment, a lock-up clutch piston 5 and a drive plate 9 are used as shown in FIG.
The same effect can be achieved by using a filler plate stretched between the grooves 4 or by using a rubber material 1b stuck to the wall opposite to the side wall sb' of the notched groove ib as shown in Fig. 4. It will be done.

Furthermore, in order to make it possible to displace the p-pull-up clutch piston b in the axial direction, instead of devising the driving connection between it and the torsional damper 7 as described above,
Figure 5 (a) and Figure 5 (bl)? 10 This driving connection may be a rigid connection using a rivet 17, and the driving connection between the torsional damper 7 and the turbine hub 8 may be performed by making a relative displacement 6S in the axial direction. In this case, the inner periphery of the driven plate 10 is drivingly connected to the turbine hub 8 by engagement of the pawl 10a and the cutout groove 8a, or by means of a joint so as to be movable relative to the turbine hub 8 in the axial direction.

Such a lock-up torque converter is also shown in FIGS. 2 to 4.
The following is a representative explanation of the case where the idea of FIG. 2 is applied to see whether similar effects can be achieved by applying the idea of the present invention described above with reference to the drawings. That is,
The leaf spring 18 is riveted to the turbine hub 8 using rivets 9, and the tip of the leaf spring 18 presses the pawl 105L against the side wall ga' of the notched groove 8a.

Even in the lock-up torque converter of this embodiment, the relative rotation of the torsional damper buff and the turbine hub 8 is prevented by the pre-load of the leaf spring 18, and the drive coupling between the torsional damper and the turbine hub 8 is prevented. The object of the present invention, which is to prevent cracking noise from occurring due to backlash in the rotational direction, can be achieved in the same manner as in the above-described example.

[Brief explanation of drawings]

FIG. 1(a) is a half vertical side view showing a conventional lock-up torque converter, FIG. 1(b) is a perspective view of the main part thereof, and FIG. 2(a) is a lock-up torque converter of the present invention. FIG. 2(b) is a half-part vertical side view, FIG. 2(b) is a similar view from S#V, FIG. 8 and FIG. Fig. 2(a) is a partial perspective view, and Fig. 2(a) shows another example in the history of the present invention.
Fig. 45 (D) is the same Abe oblique drawing, Fig. 6 is a silk change characteristic diagram with respect to the torsional damper torsion angle of the conventional torque converter, and Fig. 7 is the torque converter of the present invention. FIG. 3 is a torque change characteristic diagram with respect to the torsion angle of the lateral tamper. 100. Pump impeller, 2...Turbine runner, 8
...Stator, 4...Funverter cover, 5...
Lock-up clutch piston, 5a...Clutch 7
Acing, 5b... Notch groove, 7... Torsion damper, 8... Turbine hub, 8a... Notch groove, 9
...Drive plate, 9a...Claw, lO...Drab plate, lOa...Claw, ll...Torsion spring, 12.18...Plate spring, 18,16,1
7,19, , rivet, 14...coil spring, 16...com material. Figure 1 <a> ・b Figure 2 (a) (b) Figure 3 Figure 4] 1 /n Figure 6 CT) Figure 7 rT]

Claims (1)

[Claims] L Lock-up clutch piston in direction of shaft 81
In a lock-up torque converter in which power from the converter cover can be taken out via a Y-sinal damper and a turbine hub, the lock-up clutch piston can be displaced in the axial direction by being brought into pressure contact with the converter cover. A lock-up torque converter characterized in that the torsional damper is drivingly coupled to the lock-up clutch piston or the turbine hub, and the rotational play in the coupling portion is made to exist only in one rotational direction by an elastic member. .