JPS6112146B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque converter with a lockup device used in a transversely mounted automatic transmission for a front wheel drive vehicle, and particularly to a torque converter with a lockup device for controlling the oil supply/drainage path for hydraulic oil to the torque converter and the operation of the lockup device. The present invention relates to the arrangement structure of oil passages for lock-up control.

In this type of horizontal automatic transmission, it is desirable that the final reduction gear is located in the center of the vehicle so that the left and right drive shafts, which are disposed between the drive wheels and connected to the drive wheels, have approximately equal lengths.

Therefore, it is better to place the output gear of the transmission that drives this final reduction gear as close as possible to the center of the vehicle. Therefore, in this type of horizontal automatic transmission, the oil pump, which is normally placed in the transmission side case of the torque converter, is installed in the case on the opposite side of the transmission from the torque converter side, and the oil pump is installed in the case of the transmission opposite to the torque converter side. as close to the torque converter as possible,
I try to keep it close to the center of the vehicle.

For this reason, the oil pump drive shaft that drives the oil pump is an elongated shaft that extends from the front cover of the torque converter through the transmission to the pump, and the input shaft of the transmission is a cylinder that surrounds this pump shaft. A shaped axis is used.

A torque converter with a lockup device used in such a horizontal automatic transmission requires at least three oil passages between the control valve blocks.

That is, an oil supply path that supplies hydraulic oil from the torque converter hydraulic oil source to the torque converter, and an oil drain path that removes hydraulic pressure from the torque converter and discharges the hydraulic oil to the pressure holding valve, are separate from the above-mentioned oil supply and drain path. Three oil passages are required, from the lock-up control valve to the clutch piston for lock-up of the torque converter, and they must be provided between the shafts without interference.

For this reason, a conventional torque converter with a lockup device for a horizontal automatic transmission has been constructed as shown in FIG.

That is, in the figure, a indicates an oil pump drive shaft that drives an oil pump, and is spline-coupled to a converter cover b of a torque converter driven by an engine.

c shows the input shaft of the transmission, which is arranged around the oil pump drive shaft a through the bush d, and is spline-fitted to the boss of the turbine runner e of the torque converter, and torque is transmitted from the converter cover. It is supported via a bush g on a hollow fixed shaft f protruding toward the converter.

This hollow fixed shaft f supports a stator h of the torque converter via a one-way clutch i, and also supports a sleeve l of a pump-in roller k of the torque converter via a bush j at another position. .

and, as a lock-up device, a lock-up clutch piston m crimped to the inner wall of the converter cover b so as to be able to rotate therewith as appropriate;
A torsional damper n drivingly connects this lock-up clutch piston m to a turbine runner e.
etc.

The three oil passages mentioned above, that is, the lock-up control oil passage, are formed through a hole o provided at the center of the oil pump drive shaft a, and the inflow oil passage to the torque converter is fixed to the input shaft c. axis f
The outflow oil path from the torque converter is formed through a gap p between the oil pump drive shaft a and the input shaft c, and a hole q formed in the hollow fixed shaft f. It is formed with a gap s in between.

However, if this is done, the oil pump drive shaft a is thin and long, so if it is made into a hollow shaft, the strength will be reduced and the manufacturing cost will be increased. Further, since the input shaft c has a small wall thickness, if the hole r is made in the radial direction, the strength will be reduced.

The present invention has been made to solve the above-mentioned drawbacks, and consists of four axes: an oil pump drive shaft, an input shaft, a hollow fixed shaft, and a torque converter sleeve shaft. 3
By forming oil passages in the gaps between the shafts of the set, the oil pump drive shaft is not made into a hollow shaft, thereby preventing a decrease in strength and increasing costs.Furthermore, by eliminating the need for a hole in the input shaft, the input shaft can be improved. The purpose is to prevent a decrease in strength.

Hereinafter, the present invention will be explained in detail with reference to embodiments of the drawings.

FIG. 2 shows the entire lock-up torque converter of the present invention. In the figure, 2 is a converter cover, and a sleeve 4 protruding from the center thereof is inserted into a crankshaft (not shown) for centering. A pump impeller 6 is fitted and welded to the periphery of the opening far from the end wall of the converter cover 2, and a turbine runner 8 is riveted to the flange of the hub 10. A stator 12 constitutes a torque converter together with a pump impeller 6 and a turbine runner 8, and is attached to a hollow fixed shaft 16 via a one-way clutch 14.

The input shaft 18 of the transmission is loosely fitted into the hollow fixed shaft 16, and two pushers 102 and 104 are arranged between them.
04 is partially cut out to form hydraulic oil discharge passages 66, 68.
form. A hub 10 of a turbine runner 8 is spline-coupled to an input shaft 18, and a torus 2 is connected between an end face of the hub and a converter cover 2.
2 to define a chamber 24.

A lock-up clutch piston 26 is slidably fitted to the outer peripheral surface of the hub 10, and the piston 26
When the annular clutch facing 28 provided on one side comes into contact with the end wall of the converter cover 2, the converter cover 2 and the lock-up piston 2
A chamber 30 is defined between the hub 10 and the hub 10, and the chamber 30 is communicated with the chamber 24 through a cutout groove 32 provided in the end surface of the hub 10. An annular connecting member 34 having an L-shaped cross section is fixed to the other side of the lock-up piston 26 far from the converter cover 2, and is present between the vicinity of the inner circumference of the turbine runner 8 and the vicinity of the inner circumference of the lock-up piston 26. A torsional damper 38 having a built-in torsion spring 36 is arranged in a relatively large space. A sleeve 40 having an L-shaped cross section is welded to the inner circumference of the pump inverter 6 of the torque converter.
0 is supported on the front cover 44 via a bush 106 at its outer periphery, and an oil passage 60 is opened in a space 108 between the sleeve 40 and the hollow fixed shaft 16. An oil seal 48 attached to a ring-shaped adapter 46 protruding from a front cover 44 integrated with the hollow fixed shaft 16 is in contact with the outer periphery of the sleeve 40 .

Space 1 between hollow fixed shaft 16 and sleeve 40
08 reaches a pressure regulator valve 62 via a passage 60. Further, the passage 66 between the hollow fixed shaft 16 and the input shaft 18 is a passage 68.
As shown diagrammatically, the oil is connected to an oil reservoir 76 through a pressure holding valve 70, an oil cooler 72, and various lubricating parts 74 in sequence.

Further, the chamber 30 between the converter cover 2 and the lock-up piston 26 has a notched groove 3 as described above.
2 to the chamber 24 and the input shaft 1
8 and the oil pump drive shaft 78 to a lock-up control valve 82 as shown diagrammatically. The lock-up control valve 82 has the function of switching and connecting the oil passage 80 to the oil reservoir 76 via an oil passage 84 from the pressure regulator valve 62 or a drain passage 88 having an orifice 86. Further, the pressure regulator valve 62 has a function of receiving oil discharged from the oil pump 90 via an oil passage 92, regulating the line pressure for performing a gear change operation of the transmission, and sending it out to an oil passage 94. The excess oil that occurs when
Make sure to discharge it.

The torque converter with a lockup device of the present invention constructed as described above operates as follows.

The rotation of an engine crankshaft (not shown) is transmitted to the pump invera 6 via the converter cover 2, and the pump invera 6 is constantly driven to rotate while the engine is operating. At the same time, the oil pump 90 is also constantly driven via the oil pump shaft 78 while the engine is running.

When the vehicle is in an operating state that does not satisfy the lockup conditions of the torque converter, the lockup control valve 82 communicates with the pressure regulator valve 62 via an oil passage 80 and an oil passage 84. On the other hand, the oil discharged from the pressure regulator valve 62 is
0, reaches the inside of the pump invera 6 through the space 108, and flows through the inside of the turbine runner 8, the oil passage 66, and the oil passage 68 to the pressure holding valve 70, and the inside of the torque converter is maintained at the set pressure of the pressure holding valve 70. drooping This set pressure is also transmitted to the chamber 30 via the lock-up control valve 82, oil passage 80, chamber 24, and notch groove 32 which are in the above-mentioned switched state, and is balanced with the torque converter internal pressure.

Thus, the oil pressure is balanced on both sides of the lockup piston 26, the piston 26 is separated from the converter cover 2, and the lockup of the torque converter is released.

In this lock-up release state, the hydraulic oil flowing in the torque converter while being kept at the above-mentioned set pressure transmits the rotational torque of the pump inverter to the turbine runner 8 under the reaction force of the stator 12 while converting the torque, and the torque converter normally operates. It functions like. The rotation of the turbine runner 8 is controlled by the hub 10.
The engine power is transmitted to the input shaft 18 via the input shaft 18, which inputs the engine power to the gear train of the transmission.

Note that the hydraulic oil after flowing through the pressure holding valve 70 is cooled by an oil cooler 72 provided in the lower tank of the editor, etc., and then supplied to various lubricating parts 74 of the transmission, and then transferred to the oil reservoir 7.
6 (Usually the oil pan at the bottom of the transmission)
From this oil reservoir, the oil is again sucked into the oil pump 90 and discharged through an oil path (not shown).

When the vehicle enters a driving state that satisfies the lock-up conditions of the torque converter (for example, at the highest gear ratio and at a certain vehicle speed or higher), the lock-up control valve 8 is activated.
2 switches and connects the oil passage 80 to a drain passage 88 leading to the oil reservoir 76. As a result, the oil pressure in the chamber 30 (same as the torque converter internal pressure) is reduced to the groove 3.
2, through the chamber 34, the oil passage 80, and the lock-up control valve 82, and the lock-up crack piston 26 is drawn out through the second chamber 34, the oil passage 80, and the lock-up control valve 82, and the second
Move to the right in the diagram. At this time, the clutch facing 28 provided on the lock-up crack piston 26 is pressed against the inner surface of the end wall of the converter cover 2, and the lock-up crack piston 26 is directly connected to the converter cover 2 and, therefore, to the pump inflator 6. It rotates as one with them. This rotation of the lock-up crack piston 26 is mechanically transmitted to the turbine runner 8 via a torsional damper 38. The impact at the beginning of transmission of this rotational torque is absorbed by the built-in torsion spring 36, and the torsional damper 38 can perform the desired action, that is, the action of transmitting torque while absorbing the impact. Thus, the turbine runner 8 is directly connected to the pump inverter 6 via the torsional damper 38, the lock-up crack piston 26, and the converter cover 2, and the torque converter is brought into a lock-up state in which it operates without the use of internal hydraulic oil. I can do it.

As described above, according to the present invention, the hollow fixed shaft 16
and the input shaft 18 as a discharge passage for the torque converter hydraulic oil, and the space between the outer periphery of the hollow fixed shaft 16 and the inner periphery of the sleeve 40 of the pump invera as a supply passage for the torque converter hydraulic oil. The passages are both arranged outside the input shaft 18 and are connected to the input shaft 18.
The space between the oil pump drive shaft 78 and the oil pump drive shaft 78 can be used exclusively as a lock-up control oil passage 80, and there is no need to make the oil pump shaft 78 hollow and use it as a passage, so the strength of the oil pump drive shaft 78 is reduced. Since there is no need to use a hollow shaft, the drawback of increased manufacturing cost is also eliminated.

Further, according to the present invention, the input shaft 1
Since there is no need to provide a horizontal hole in the input shaft 8, it is possible to eliminate a decrease in the strength of the input shaft 18.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional device, and FIG. 2 is a sectional view showing an embodiment of the present invention. 2...Converter cover, 6...Pump inverter, 8...Turbine runner, 12...Stator,
14... One-way clutch, 16... Hollow fixed shaft, 18... Input shaft, 26... Lock-up crack piston, 38... Torsion damper, 40... Sleeve shaft, 60... Oil passage (inflow oil 64... Notch groove, 68... Oil passage (outflow oil passage) 80... Oil passage (lockup control oil passage), 78... Oil pump drive shaft, 102, 1
04...butsuyu, 106...butsuyuu, 108
……space.

Claims (1)

[Claims] 1 In a torque converter with a lock-up device, four shafts, an oil pump driving oil, a transmission input shaft, a hollow fixed shaft, and a torque converter sleeve shaft, are arranged concentrically and superimposed, and the sleeve shaft is connected to the hollow shaft through a bearing. The input shaft is supported on the fixed shaft and on the hollow fixed shaft via a pusher, and the space between the oil pump drive shaft and the input shaft and the space between the tip of the input shaft and the converter cover A lock-up oil passage is formed, a space between the input shaft and the hollow fixed shaft forms a hydraulic oil outflow passage from the torque converter, and an inflow oil passage of the torque converter is formed between the hollow solid shaft and the torque converter sleeve shaft. A torque converter with a lockup device formed by the space between.