JPH0626560A - Hydraulic coupling with lockup - Google Patents

Abstract

PURPOSE:To achieve an improvement in lockup performance as aiming at good productivity and the promotion of light weightiness in coupling weight, in a lockup hydraulic coupling with a coupling cover formed with a facing sliding surface of a lockup clutch on its inner surface. CONSTITUTION:A ring platelike reinforcing plate 10 notched with a part of a boss 9 is secured tight, through which it is constituted of uniformizing the circumferential rigidity of a converter cover 1 (coupling cover).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lockup fluid coupling such as a torque converter with lockup and a fluid coupling with lockup, and more particularly to a reinforcing structure for a joint cover.

[0002]

2. Description of the Related Art For example, in a torque converter with a lock-up, when only a plurality of bosses are provided on a converter cover, the boss has a high rigidity and the boss has a low rigidity. As described above, since there is a difference in rigidity in the circumferential direction, at the time of lockup, the facing sliding surface of the converter cover is undulatingly deformed due to the difference in the amount of axial deformation, resulting in uneven facing.

As a result, the facing strength is deteriorated, the vibration performance is deteriorated, and the stability of the frictional characteristics is impaired, so that the lock-up performance is greatly affected.

On the other hand, for example, on page K-59 of the "Eunoscosmo Maintenance Manual" (issued in March 1990),
As shown in FIG. 5, a ring-shaped boss having screw holes formed at four positions is fixed on the outer surface of the converter cover to keep the rigidity of the converter cover in the circumferential direction high and reduce the undulating deformation of the facing sliding surface. A possible structure is shown.

[0005]

However, the conventional reinforcing structure of the converter cover by the ring-shaped boss has the following problems.

(1) When the automatic transmission is driven and the performance is checked in the final process of manufacturing the automatic transmission, as shown in FIG.
As shown in, the drive shaft and the ring-shaped boss must be screwed each time, resulting in poor productivity.

(2) Since the ring-shaped boss has a large thickness because the depth of the screw hole must be maintained at a predetermined depth, the addition of the ring-shaped boss causes an increase in the weight of the torque converter.

The present invention has been made by paying attention to the problems as described above. Good production is achieved in a lock-up type fluid coupling having a joint cover on the inside of which a facing sliding surface of a lock-up clutch is formed. The objective is to achieve improved lock-up performance while reducing the weight and the weight of the joint.

[0009]

In order to solve the above-mentioned problems, in the lock-up fluid coupling of the present invention, the circumferential rigidity of the joint cover is improved by fixing the ring plate-shaped reinforcing plate with the boss portion cut out. It is configured to be uniform.

That is, a joint cover having a facing sliding surface of a lock-up clutch formed on the inner surface thereof, and a plurality of projections are provided on the circumference of the outer surface of the joint cover as a connecting structure of the joint cover and the input member. A boss and a ring plate shape in which the boss portion of the joint cover is cut out,
The reinforcing plate is fixed to a position corresponding to the facing sliding surface, and has a reinforcing plate whose thickness is set to be a predetermined dimension lower than the height of the boss.

[0011]

The fluid coupling with lock-up according to the present invention has a ring plate shape in which the boss portion of the joint cover is cut out, and the reinforcing plate is fixed at a position corresponding to the facing sliding surface. The rigidity between the boss and the portion between the bosses is increased by the integral reinforcing plate, and since the reinforcing plate 10 is integrated, the rigidity between the bosses is equalized, and the circumferential direction of the joint cover is increased. The difference in rigidity between the two can be kept small.

Therefore, when the clutch pressure contact force from the lockup clutch acts on the facing sliding surface during lockup, the difference between the axial deformation amount of the boss portion and the axial deformation amount of the inter-boss portion can be suppressed to a small level, The flatness of the facing sliding surface is maintained, and a uniform contact of the facing is ensured.

At the time of the test in the final step of manufacturing the automatic transmission, since the thickness of the ring-plate-shaped reinforcing plate is set to be lower than the height of the boss by a predetermined dimension, the protruding boss is rotated in the rotational direction. It is possible to give rotational drive to the joint cover by boss side drive just by fitting,
Compared with the conventional ring-shaped boss, the number of steps for screwing is reduced.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

First, the structure will be described.

FIG. 1 is a perspective view showing a torque converter with lockup according to an embodiment of the present invention (an example of a fluid coupling with lockup), FIG. 2 is a longitudinal sectional view showing the torque converter with lockup according to the embodiment, and FIG. The front view which shows the torque converter with a lockup of an Example, FIG. 4 is a top view which shows a reinforcing plate, FIG. 5 is a direction A arrow view of FIG. 4 which shows a reinforcing plate.

As shown in FIG. 2, the torque converter with lockup of the embodiment has a pump impeller 2 connected to a converter cover 1 (corresponding to a joint cover) and a turbine hub 3 on a transmission input shaft (not shown). A turbine runner 4 connected to each other, a stator 6 disposed at an inner diameter position sandwiched between the pump impeller 2 and the turbine runner 4, and provided via a one-way clutch 5 to a transmission case (not shown), and the converter cover 1 A lock-up clutch 7 that is arranged so as to be slidable in the axial direction in a space between the turbine cover 3 and the turbine runner 4 and that can directly connect the converter cover 1 and the turbine hub 3 is provided.

The converter cover 1 is provided on its inner surface with a facing sliding surface 1a on which the facing 7a of the lock-up clutch 7 comes into contact and slides at the initial stage of lock-up engagement, the lock-up release, and the slip lock-up. Four bosses 9 as a connecting structure for connecting the converter cover 1 and the torque plate 8 (corresponding to an input member) are provided at equal intervals on the circumference of the outer side surface.

Further, the converter cover 1 has a boss 9
The boss 9 adjacent to the boss cutout 10a
A ring plate-shaped reinforcing plate 10 having an outer peripheral cutout portion 10b formed by cutting out an outer peripheral portion between the boss and the boss is fixed to a position corresponding to the facing sliding surface 1a. And
The thickness of the reinforcing plate 10 is set to be lower than the height of the boss 9 by a predetermined dimension (at least 3 mm or more).

As shown in FIG. 3, the reinforcing plate 10 is spot-welded (spot-welded portion 10c) at a position between adjacent bosses 9 at a total of 7 places, that is, 4 places inside and 3 places outside.
By doing so, the converter cover 1 is fixed.

Next, the operation will be described.

(A) At lock-up The torque converter with lock-up shown in the embodiment has a ring plate shape in which the portion of the boss 9 of the converter cover 1 is cut out, and is located at a position corresponding to the facing sliding surface 1a. Since the reinforcing plate 10 is fixed, the portion between the boss 9 and the boss 9 has a high rigidity, whereas the reinforcing plate 10 has a high rigidity.
The rigidity is increased by the use of the reinforcing plate 10. Moreover, since the reinforcing plate 10 is integrated, the rigidity between the bosses is made uniform as compared with the case where the reinforcing plate is fixed by dividing the bosses 9 in the circumferential direction of the converter cover 1. The difference in rigidity between the two can be kept small.

Therefore, at the time of lockup, the clutch pressure contact force from the lockup clutch 7 is applied to the facing sliding surface 1.
When acting on a, the difference between the amount of axial deformation of the boss portion and the amount of axial deformation of the portion between the bosses is suppressed to be small, and the flatness of the facing sliding surface 1a is maintained, so that the facing 7a is even. The hit is secured.

That is, when the flatness of the facing sliding surface cannot be maintained due to the undulation deformation, the facing peels off to deteriorate its strength, and the fluctuation of the transmission torque deteriorates the vibration performance. Due to slippage variation, the stability of friction characteristics will be impaired,
While the influence on the lockup performance is extremely large, the flatness of the facing sliding surface 1a is maintained and the even contact of the facing 7a is ensured, so that the lockup performance is constantly improved. Will be done.

(B) Test At the time of the test in the final process of manufacturing the automatic transmission, the thickness of the ring-plate-shaped reinforcing plate 10 is set to be lower than the height of the boss 9 by a predetermined dimension, so that FIG. As shown in
The converter cover 1 can be rotationally driven by a boss side drive that simply fits the protruding boss 9 in the rotational direction.

That is, the number of steps for screwing can be reduced as compared with the case of the conventional ring-shaped boss, and the productivity is improved.

Next, the effect will be described.

(1) In a torque converter with a lockup having a converter cover 1 having a facing sliding surface 1a of a lockup clutch 7 formed on its inner surface,
Reinforcement plate 1 in the form of a ring plate with the boss 9 cut away
Since the rigidity of the converter cover 1 in the circumferential direction is made uniform by fixing 0, compared with the conventional ring-shaped boss, good productivity and weight reduction of the torque converter can be achieved. At the same time, improvement in lockup performance can be achieved.

(2) Since the reinforcing plate 10 has the outer peripheral notch 10b formed by notching the outer peripheral portion between the adjacent bosses 9 and the adjacent bosses, the outer peripheral portion is formed into a perfect circular shape having no unevenness. It is possible to achieve a lighter weight compared to. still,
Since the outer peripheral cutout 10b is a portion that hardly contributes to the rigidity of the converter cover 1, the decrease in rigidity can be minimized.

Although the embodiments have been described above with reference to the drawings, the specific structure is not limited to the embodiments, and modifications and additions within the scope of the present invention are included in the present invention. Be done.

For example, in the embodiment, the example of application to the torque converter with lockup is shown, but it can be applied to a fluid coupling with lockup such as a fluid coupling with lockup.

[0032]

As described above, according to the present invention, in the lock-up type fluid coupling having the joint cover on the inner surface of which the facing sliding surface of the lock-up clutch is formed, the boss portion is notched. By fixing the ring plate-shaped reinforcing plate that was used, the rigidity of the joint cover in the circumferential direction is made uniform, so that it is possible to improve lockup performance while achieving good productivity and weight reduction of the joint weight. The effect of being able to do is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a torque converter with lock-up according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a torque converter with lockup according to an embodiment.

FIG. 3 is a front view showing a torque converter with lockup according to an embodiment.

FIG. 4 is an explanatory diagram showing a test state in a final step of manufacturing an automatic transmission by boss side drive.

FIG. 5 is a perspective view showing a conventional torque converter provided with a ring-shaped boss.

FIG. 6 is an explanatory diagram showing a test state in a final step of manufacturing an automatic transmission by screw driving.

[Explanation of symbols]

 1 Converter Cover (Joint Cover) 1a Facing Sliding Surface 7 Lockup Clutch 8 Torque Plate (Input Member) 9 Boss 10 Reinforcing Plate 10a Boss Notch

Claims (1)

[Claims] 1. A joint cover in which a facing sliding surface of a lockup clutch is formed on an inner side surface, and a plurality of joint covers connected to the joint cover and an input member are provided on a circumference of an outer side surface of the joint cover. A boss and a ring plate shape in which the boss portion of the joint cover is cut out, and is fixed at a position corresponding to the facing sliding surface, and its thickness is set to be a predetermined dimension lower than the height of the boss. A lockup fluid joint, comprising: