JPS5834262A - Fluid torque converter equipped with torque variation buffering means - Google Patents

Abstract

PURPOSE:To control the beating noise generated in the revolution power transmission system by incorporating a torque variation buffering means between a turbine runner and an output shaft. CONSTITUTION:When a turbine runner 7 is supported onto an output shaft 9 through a disk 8, a compression coil spring 16 is inserted into the groove 15 in the peripheral direction of the disk 8, and annular elements 17 and 18 are installed on both sides of the disk 8,and the annular disk 28 for fixing the runner 7 is arranged on the disk 8, and rotatably engaged with a one-way clutch 11 on one side of the disk 28, and frictionally engaged with the disk 8 through an annular lining sheet 30 on the other side. Thus, the runner 7 is interlocked with the output shaft 9 via an elastic revolution power transmitting circuit arranged through a spring 16 etc. and via a frictional contact revolution power transmitting circuit arranged through the disk 28 etc., and sharp inversion of torque can be absorbed in the deformation of the spring 16 and the frictional sliding of the disc 28, sheet 30 etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic torque converter, and more particularly to a hydraulic torque converter that is incorporated into a vehicle automatic transmission and is equipped with a torque fluctuation buffer.

Automatic transmissions for vehicles generally have a configuration in which a fluid torque converter and a gear transmission mechanism are connected in series, and the rotational power generated by the engine is transmitted to the gear transmission mechanism via the fluid torque converter. After being given a predetermined speed conversion, it is guided to a working gear mechanism via the propeller shaft or without passing through the propeller shaft, from which it is transmitted to the drive wheels. In such a rotary power transmission system, there are gaps corresponding to backlash, especially in the meshing parts of various gears, so if the accelerator pedal is suddenly depressed more strongly than in the released state, the engine torque will suddenly reverse and increase. As a result, a strong impact is generated between the teeth at each part of the gear meshing, and hammering sounds may be generated at various locations in the rotary power transmission system. This type of hitting noise may also occur for the same reason when the accelerator pedal is suddenly released from the depressed state while the vehicle is running.

The generation of such hitting noises is caused by the rotational play or backlash caused by vehicle backlash, etc. in the rotational power transmission system from the engine to the drive wheels, and this play causes two adjacent rotations! This is due to the fact that there is no damping means with a damping capacity capable of sufficiently absorbing the impulsive torque fluctuations that occur at the end of the free relative rotation. Of course, the hydraulic torque converter has the ability to absorb fairly large Is torque fluctuations as a buffer, but the turbine runner in the hydraulic torque converter itself is a member that has quite large inertial torque fluctuations, so it is difficult to generate hammering noise. For relatively small torque fluctuations, the hydraulic torque converter has almost no buffering function.

The present invention deals with the above-mentioned hammering noise that occurs in a vehicle's single-rotation power transmission system when an accelerator pedal is depressed or released. The purpose is to provide a means that can suppress the occurrence.

According to the present invention, this object is achieved by incorporating a torque fluctuation buffer between a turbine and an output shaft drivingly connected to the turbine in a hydraulic torque converter in an automatic transmission for a vehicle. be done.

A hydraulic torque converter installed in a vehicle automatic transmission generally includes a front cover, a pump impeller connected to the front cover at the outer periphery, and a fluid discharged from the pump impeller located between the front cover and the pump impeller. a stator that is disposed between the turbine runner and the pump impeller and deflects fluid discharged from the turbine launch to flow back to the pump impeller; and an output shaft that is drivingly connected to the turbine launch. In this case, the turbine launch is fixedly drivingly connected to the output shaft by a spline or the like. The present invention provides a high structural flexibility that can be obtained in the drive connection structure between the turbine launch and the output shaft in such a structure of a hydrodynamic torque converter, and the separation between it and the turbine launch by a front cover. In view of the high capacity for additional structures that the 9-wheel drive system has, it is proposed that a torque fluctuation buffering means be incorporated into the drive connection between the turbine runner and the output shaft, making effective use of these features.

The invention will be explained in more detail below by way of example embodiments with reference to the attached figures.

FIG. 1 attached herewith is a sectional view of essential parts showing one embodiment of a hydraulic torque converter incorporating a torque fluctuation buffering means according to the present invention. In the figure, 1 is the rear end of the engine output shaft, and a drive plate 2 is attached to the rear end by a plurality of ports 3. The drive plate 2 may be connected to the front cover 5 by a plurality of ports 4. A pump impeller 6 is connected to the front cover 5, and the engine output shaft 1, drive plate 2, front cover 5, and pump impeller 6 rotate together around the rotation axis x-x. ing.

The pump impeller 6 includes an outer shell 126a, a plurality of vanes 6b arranged circumferentially t& inside the outer shell 126a, and an inner shell 6C carried by these vanes.

In the oil chamber defined by the front cover 5 and the outer lea of the pump impeller, a turbine runner 7 is provided with a fluid inlet 71 close to the annular fluid outlet 6e of the pump impeller 6. Ru.

The turbine land 7 includes an outer shell 7a, a large number of blades 7b arranged along the circumferential direction inside the outer shell 7a, and an inner shell 7C supported by these blades, and includes a disk 8 as described below. It is carried by the output shaft 9 via the output shaft 9 and is also adapted to rotate around the rotation axis xx.

Between the turbine runner 7 and the pump impeller 6, a stator 10 is provided which has a fluid inlet 101 close to the fluid outlet 7e of the turbine launch. The stator 10 also includes an outer shell 10a, a large number of blades 10b arranged along the local direction inside the cough outer shell, and an inner shell 10C supported by these blades. By being supported by a fixed hollow shaft 12 via a clutch 11, it can rotate only in one direction around the rotational axis xx.

13 is a housing surrounding the pump impeller, turbine launch, and stator. The output shaft 9 is connected to the input shaft of a gear transmission mechanism (not shown) located at the rear of the torque converter, that is, to the right in the figure, and drives the gear transmission mechanism.

Pump impeller 6, turbine runner 7 and stator 10
The vanes 6b, 7b, and 10b constitute an annular fluid passage T as shown in the figure, and the fluid circulates counterclockwise when looking at the fluid passage at the top of the figure. That is, the fluid urged by the pump impeller 6 and discharged from its fluid outlet 6e flows into the turbine launch 7 from its fluid inlet 71, flows through the turbine runner, and then flows into its fluid outlet 7e. More stator 1
After flowing into the stator, the fluid flows into the fluid from the circle portion 101, flows through the stator, flows out from the fluid outlet portion 1Qe, and flows into the pump impeller 6 again from the fluid inlet portion 61.

The disk 8 is attached to the output shaft 9 by a spline 14 at its hub portion 8a. A plurality of circumferential grooves 15 are provided on the outer peripheral edge of the disk 8, and a compression coil spring 16 is fitted into the cough direction groove. disk 8
Annular elements 17 and 118 are provided on both sides of the .

These annular elements 17 and 18 each have a disk 8
Circumferential notches 19 and 20 are provided at positions corresponding to the circumferential grooves 15 . Diagonal pieces 21 and 22 are formed on the inner and outer edges of the circumferential notch 19 in the annular element 17, respectively, and are cut and raised diagonally from the notch 19. Similarly, diagonal pieces 23 and 24 which are cut and raised from the notch 20 are formed at the inner and outer peripheral edges of the circumferential notch 20 in the annular element 18 .

These diagonal pieces 21 to 24 are connected to the circumferential groove 15 of the disk 8.
engages with the outer circumferential surface of the compression coil spring 16 installed inside,
The compression coil spring is held in the position installed in the circumferential groove 15.

The circumferential notches 19 and 20 are capable of selectively engaging the compression coil spring 16 at both ends thereof in the circumferential direction. The annular elements 17 and 18 are connected to each other by a connecting pin 25 at a position in the middle of a plurality of circumferential notches 19 and 20 provided at intervals along the circumferential direction. These connecting pins extend through the disk 8 parallel to the axis x-x, and at the portion where these connecting pins pass through the disk 8, the disk is made to pass through these connecting pins. A circumferential groove 26 is formed over the angular range of the connecting pin to allow rotation relative to the disk 8 about the axis x--x.

The annular element 17 is connected to the turbine runner 7 at its peripheral edge 17a.
It is fixed to the outer shell 7a of. The two may be joined by welding or the like. The turbine runner 7 is fixed to an annular disk 28 by a plurality of pins 27 at its inner circumference. The annular disk 28 is the hub portion 8a of the disk 8.
, and is rotatably engaged with the one-way clutch 11 via a rolling bearing 29 on one side, and via an annular lining sheet 30 on the other side. and is frictionally engaged with the inner peripheral portion 8b of the disk 8. The turbine runner 7 therefore includes an annular element 17,
The compression coil spring 16 is connected to the output shaft 9 through an elastic rotary power transmission path passing through the disk 8 in a rolling force transmission relationship, and at the same time, the annular disk 28 and the lining sheet 3
0, it is connected to the output shaft 9 in a rotational power transmission relationship through a frictional contact rotational power transmission path passing through the disk 8 .

In such a configuration, if the accelerator pedal is suddenly depressed or released, a sudden reversal occurs in the rotational torque transmitted through the rotational power transmission system from the engine to the drive wheels.
This sudden torque reversal is absorbed by the deformation of the compression coil spring 16 and the - one-stroke movement of the turbine runner 7 and the disk 8 at the overlapping part of the annular disk 28, lining sheet 30, and inner peripheral edge 8b of the disk 8, and the torque is The sudden reversal of the rotary power transmission system is softened, and a hammering sound is generated due to a strong collision between members such as a skewer that engage with each other in a part where there is play such as gear backlash in the rotary power transmission system. is avoided.

FIG. 2 is a diagram similar to FIG. 1 showing a hydraulic torque converter incorporating one modified example of the torque fluctuation buffer shown in FIG. 111. In FIG. 2, parts corresponding to those shown in FIG. 1 are designated by the same reference numerals as in the first part. In this embodiment, in order to further increase the ability of the torque fluctuation buffer to absorb frictional impact energy, the annular 1! l118 is #III& is disk 8
It extends in the shape of a disk to the vicinity of the 61 part 8a,
The inner peripheral edge 18a and the inner peripheral edge of the disk 8 are connected to the hub portion 8.
A friction ring 31 is provided between the corners intersecting a, so that the energy absorbed frictionally by the relative rotation of the turbine runner 7 and disk 8 is increased.

Figure 3 eliminates the shock torque absorption by the spring, and all l
FIG. 2 is a view similar to FIG. 1 or 2 showing an embodiment of a hydraulic torque converter according to the invention incorporating torque fluctuation damping means configured to absorb torque energy by frictional sliding; . In this embodiment, the disk 8 substantially consists of only the inner circumferential edge 8b in the previous embodiment, and a spline 32 is formed on the outer circumferential edge. A spline 3 is provided on the outer peripheral edge of the disk 28 and is loosely engaged with the angular range of the spline 32.
A rim portion 34 with 3 is formed. An annular l1135 is attached to the rim portion 34 by a plurality of screws 36, and the outer peripheral edge of the disk 8 is sandwiched between the outer peripheral edge of the disk 28 and the annular element 35.

Even in such a configuration, when the discs 28 and 8 try to rotate relative to each other, frictional force acts on them via the lining sheet 30, and the energy of the impact torque becomes effective due to such frictional sliding. , and the transmission of impact torque is buffered.

The relative rotation of the discs 28 and 8 is limited to the angular range allowed between the meshes of the splines 32 and 33.

In FIG. 3, parts corresponding to those shown in FIG. 1 or 2 are designated by the same reference numerals as in FIG. It is the same as the action of the corresponding part in Figure 2, and is □.

Although the present invention has been described in detail with reference to several embodiments above, the present invention is not limited to these embodiments, and various other embodiments may be made within the W song of the present invention. It will be obvious to those skilled in the art that this is possible.

[Brief explanation of drawings]

1 to 3 are longitudinal cross-sectional views of essential parts showing three embodiments of a hydraulic torque converter equipped with a torque fluctuation buffer according to the present invention. 1... Engine output shaft, 2... Drive plate. 3.4... Bolt, 5-... Front cover, 6...
- Pump impeller, 6a, 6b, 5cm... Pump impeller outer shell, vane, inner shell, 7... Turbine runner, 7a. 7b, 7cm...Outer shell, blades, and inner shell of the turbine launch. 8...Disc, 8a-...Disk hub part, 8b
...Inner peripheral edge of disk, 9...Output shaft, 10...
・Stator* 10a - 10b, IOC...Sy-Sy outer shell, blade, inner shell, 11...One-way clutch, 12...Fixed hollow shaft, 13...Housing, 14...・Spline, 15...Circumferential groove, 16・
... Compression coil spring, 17.18-... Annular element, 17
a... Inner peripheral edge of the --shaped element, 19.20-... Circumferential notch, 21.22, 23.24... Diagonal piece, 25-...
- Pin, 26... circumferential groove. 27... Pin, 28... Annular disk, 29-...
Rolling bearing, 30--Annular lining sheet, 31
...-Friction ring, 32.33--Spline, 34
...Rim portion, 35...Annular element, 36...Screw Patent applicant Toyota 1 Automotive Industry Co., Ltd. Agent
Person Patent Attorney Takeshi Akashi Figure 1 13 Figure 2 3~

Claims (1)

[Claims] a front cover, a pump impeller connected to the front cover at an outer peripheral edge, and a turbine launch disposed between the front cover and the pump impeller and rotationally driven by the fluid discharged from the pump impeller. , a stator disposed between the turbine launch and the pump impeller to deflect fluid discharged from the turbine launch and return it to the pump impeller; and an output shaft drivingly connected to the turbine launch. What is claimed is: 1. A hydraulic torque converter, characterized in that a torque fluctuation buffering means is incorporated between the turbine runner and the output shaft.