JPH05180303A - Torque converter with lock-up mechanism - Google Patents

Abstract

PURPOSE:To reduce cost, to improve assembly performance and to improve responsiveness of a lock-up piston. CONSTITUTION:A turbine runner 2 is formed which is rotated through a fluid flowing by rotation of a pump impeller 1 fixed so that it is rotated with a pump cover 5 directly connected to a driving source. The fluid in front of a lock-up piston 10 is drained in the lock-up state to flow the fluid into the back of the lock-up piston 10 to generate a pressure gap between both sides of the lock-up piston 10. In order to quicken rise in the fluid pressure on the back of the lock-up piston 10, a turbine shell 7 close to a turbine outlet 12 is made in the emboss structure 13 as a fixing method between the turbine shell T and a turbine blade 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque converter having a lockup mechanism.

[0002]

2. Description of the Related Art As a prior art of a torque converter with a lockup mechanism according to the present invention, Japanese Patent Laid-Open No. 1-263636 has been proposed.
There is one disclosed in Japanese Patent Publication No.

FIG. 2 is a cross-sectional view of a conventional torque converter having a lockup mechanism.
The basic configuration of the torque converter with a lockup mechanism will be briefly described with reference to the drawings of a conventional torque converter.

A front cover 50 connected to a drive shaft 53 of a drive source (not shown) rotates in the same manner as the drive shaft 53,
The pump shell 58b is connected to the front cover 50 so as to form an internal space. The turbine runner 62 includes a turbine blade 62a and a turbine shell 62b.
It is formed by and is rotatably provided in the internal space so as to face the pump blade 58a fixed so as to rotate integrally with the pump shell 51. The turbine shell 62b is connected at its inner periphery to a not-shown impact side shift shaft 59 via a turbine hub 64. A stator 57 for increasing the torque is provided between the turbine runner 62 and the pump impeller 58. A lock-up piston 55 is arranged between the turbine shell 62a and the front cover 50, and the turbine hub 6 is slidable in the axial direction of the input shaft 59.
It is attached to the input shaft shaft 59 via the shaft 4.

In such a torque converter, when the fluid between the front cover 50 and the lockup piston 55 is drained and a fluid pressure is generated on the rear side of the lockup piston 55, the lockup piston 55 is fluidized. It moves under pressure to the front cover 50 side. Therefore, the friction material 61 provided on the outer peripheral edge of the lockup piston 55 is pressed against the inner peripheral surface 50a of the front cover 50 as the lockup piston 55 moves. Therefore, the front cover 50 and the lockup piston 5
5, the rotary torque from the drive shaft 52 is directly transmitted to the input shaft shaft 59 without a fluid. This state is the lockup state.

Here, the flow of the fluid in the torque converter is the fluid when the rotational torque of a drive source (not shown) is output, that is, when the pump impeller 58 rotates and the turbine runner 62 rotates through the fluid. Flows in the order of the pump impeller 58, the turbine runner 62, and the stator 57. Due to this fluid flow, the rotational torque from the drive shaft 53 is transmitted to the input shaft 59 via the fluid.

Generally, in order to improve fuel economy, the lockup piston is operated to bring it into a lockup state, and the drive shaft and the input shaft shaft are directly connected to each other, whereby the loss of the torque converter (the loss due to the passage of fluid) is reduced. I try to prevent it. That is, the fuel consumption is improved by switching from the torque converter state to the lockup state.

Further, the delay in the operation of the lockup piston until the lockup state results in deterioration of the riding comfort in the vehicle and the like, and further the seizure of the friction material occurs in the dragging of the friction material of the lockup piston. ..

Therefore, when switching to the lockup state, that is, when a pressure difference is generated on both sides of the lockup piston and a fluid pressure is instantaneously applied to the lockup piston, a conventional technique has the following structure. Provided.

A partition plate 54 is arranged between the lockup piston 55 and the turbine shell 62b, and is fixed to a connecting portion with the front cover 50 and the pump cover 51.
It is close to the turbine runner 58. Reference numeral 63 denotes a spring, and a plurality of springs 63 are circumferentially arranged between the hub 64 and the lockup piston 55 via a spring receiving member 65. By stopping the spring receiving member 65 by a stopper 66, the spring 63 Limit bias.

During the process in which the partition plate 54 is in the lock-up state, it is difficult for the fluid to flow into the front side of the lock-up piston 55, and the fluid pressure is reduced to the lock-up piston 55.
It is something that occurs in. Also, the spring 63
Since the lockup piston 55 is urged toward the front cover 50 by the urging force of the lockup piston 55, even if the fluid pressure on the back side of the lockup piston 55 decreases, the decrease can be compensated. As a result, the lockup piston 55
The friction material 61 can be quickly brought into contact with the front cover 50.

[0012]

However, the above-mentioned prior art has the following drawbacks.

Providing the spring 63 and the partition plate 54 leads to cost increase, and the assembling of the spring 63 makes the assembling work difficult.
Further, in order to improve the responsiveness by the partition plate 54, it is necessary to bring the partition plate as close to the turbine shell 62b side as possible, but in that case there is a risk of interference between the turbine shell 62b and the partition plate 54.

Then, the fluid introduced on the back side of the lockup piston 55 flows out to the turbine blade 62a side from the gap between the slit 62c and the tab 62d,
The increase in the fluid pressure on the back side of the lockup piston 52 is delayed, and the time until the pressure difference between the two sides of the lockup piston 52 is generated becomes long. That is, the response of the lockup piston 52 is delayed.

SUMMARY OF THE INVENTION Therefore, it is a technical object of the present invention to provide a hydraulic torque converter with a lockup clutch, which is lower in cost, improves the assemblability, and improves the response of the lockup piston.

[0016]

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems forms an internal space by connecting a drive shaft of a drive source and a pump shell. A pump impeller having a front cover, a pump shell, and a pump blade integrally and rotatably fixed to the pump shell, and arranged to face the pump blade by rotating through fluid as the pump blade rotates. A turbine hub that is connected to the turbine shell to which the turbine blade is fixed and that is fitted to the end of the input shaft is oil-tightly fitted to the outer peripheral surface of the turbine hub so that it can be attached to and detached from the front cover. The lockup piston is connected to the lockup piston and fixed to the turbine hub between the lockup piston and the turbine shell. B In look up Rotsukuatsupu torque converter with mechanism that includes a class Tutsi, turbine blades and turbine shell and the fixing method Rotsukuatsupu mechanism with a torque converter at least the innermost circumferential side, characterized in that the embossed structure of forming the turbine runner.

[0017]

According to the above-mentioned technical means, the fluid flows into the lockup piston and the back side for generating the pressure difference between the both sides of the lockup piston so as to establish the lockup state. Therefore, a pressure difference occurs on both side surfaces of the lockup piston, and the lockup piston moves to be in a lockup state. At that time, by embossing the fixing means between the turbine blade and the turbine shell, the fluid pressure generated on the side surface of the lockup piston does not flow out to the turbine runner side, and quickly causes the fluid pressure to the inflowing lockup piston. be able to.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the technical means of the present invention will be described below with reference to the accompanying drawings. Also,
Although the detailed configuration is different from that of the conventional torque converter, the basic configuration is substantially the same, and therefore the description is partially simplified. .

FIG. 1 is a sectional view of a torque converter with a lockup mechanism according to the present invention.

Reference numeral 1 denotes a pump blade, which is fixed to a pump shell 5 which is connected to a drive shaft 14 of a drive source (not shown) and is integrally rotated to form a front cover 6 and an internal space 17. Reference numeral 2 denotes a turbine blade, which is rotated via a fluid that flows as the pump blade 1 rotates. The fluid flows in the order of the pump impeller 1, the turbine runner 2, and the stator 3 as shown by the arrow.

A lockup clutch 4 which rotates in the same manner is arranged on a lockup piston 10 which is connected to an input transmission shaft 16 of a transmission (not shown) through a turbine hub 15.

In such a torque converter, in order to bring the lock-up state, the space 17a (front side of the lock-up piston 10) formed by the lock-up piston 10 and the front cover 6 is drained, and the lock-up clutch 4 is connected. A fluid is pressure-fed to a space (back side of the lockup clutch 4) 17b formed by the stator shell 7 to move the lockup piston 10 to the front cover 6 side, and the friction material 11 adhered to the lockup piston 10 is moved to the front side. Abut the inner wall of the cover 6 to directly connect the rotation of the front cover 6 and the input shaft 16,
The rotation torque of a drive source (not shown) is directly transmitted to the input shaft 16. The lockup clutch 4 is provided to alleviate abrupt torque transmission when directly connected.

Therefore, the lockup piston 10 is quickly released.
The following configuration was adopted to generate fluid pressure in the.

The turbine blade 2 and the turbine shell 7 are formed by inserting the tabs 8 into the slits 9 of the turbine shell 7 provided concentrically and caulking them.
However, the present invention eliminates the slit 9 of the fixing method on the innermost peripheral side (that is, the portion closest to the turbine outlet 12) among the fixing methods by caulking, and the embossed structure 13 is provided. To do. There is almost no inflow of fluid into the turbine runner 20 from the fixing means other than the innermost peripheral side. Further, even if all the fixing means are embossed structure or only the innermost peripheral side is embossed structure, substantially the same effect is obtained.

Since the fluid does not flow to the turbine blade 2 side, brazing the turbine runner 20 can be considered as another method of eliminating the gap between the slit 9 and the tab 8 of the turbine blade 2. Although it is conceivable that the slit width is narrowed and the slit width is narrowed, this method also has a drawback that it is difficult to assemble the turbine blade 2 and the turbine shell 7, and therefore these methods solve the problems. It cannot be said that this is a preferable method.

[0026]

According to the present invention, the means for fixing the turbine blade and the turbine shell is only embossed, no extra member is required, and no special means is required for assembly. It is possible to eliminate the gap between the slit and the tab of the turbine blade with the embossed structure that can improve the assembling property without increasing the cost, and to quickly generate the fluid pressure difference on both sides of the lockup piston. You can

[Brief description of drawings]

FIG. 1 is a sectional view of a torque converter with a lockup mechanism according to the present invention.

FIG. 2 is a sectional view of a conventional torque converter with a lockup mechanism.

[Explanation of symbols]

 1 Pump Blade 2 Turbine Blade 3 Stator 4 Lockup Clutch 5 Pump Shell 6 Front Cover 7 Turbine Shell 10 Rockup Piston 13 Embossing Structure 15 Turbine Hub

Claims (1)

[Claims] 1. A front cover connected to a drive shaft of a drive source to form an internal space by connecting pump shells, said pump shell, and a pump blade integrally rotatably fixed to said pump shell. A pump impeller having a turbine blade connected to a turbine impeller having a turbine blade fixed to the pump blade, the turbine blade rotating so as to face the pump blade by rotating with fluid as the pump blade rotates. A fitted turbine hub, a lockup piston oil-tightly fitted to the outer peripheral surface of the turbine hub so as to be separable from and in contact with the front cover, the lockup piston connected to the lockup piston, and the lockup piston and the A lockup clutch fixed to the turbine hub between the turbine shell and the turbine shell. In Tsu torque converter with up mechanism, the turbine blades and the turbine shell and the fixing method Rotsukuatsupu mechanism with a torque converter at least the innermost circumferential side, characterized in that the embossed structure of which form the turbine runner.