JPH06129530A - Torque converter - Google Patents

Abstract

PURPOSE:To provide a variable torque capacity type torque converter, with which great turbulence or secondary stream of the fluid in the torque converter can be prevented, and to achieve a mounting method of the variable torque capacity type torque converter on a pump of a shielding plate. CONSTITUTION:A recessed part 1b for storing a shielding plate 4 is provided on a pump 1 in a torque converter provided with the pump 1 connected to an input shaft for transmitting the drive power from a prime mover, a pump blade 2 mounted on the pump, a turbine connected to the output shaft for transmitting the drive power to a transmission, a turbine blade mounted on the turbine, and the shielding plate 4 mounted on the pump 1 for changing the channel cross section of a fluid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable torque capacity type torque converter for an automatic transmission in a drive shaft system, such as an automatic transmission for an automobile.

[0002]

2. Description of the Related Art As a variable torque capacity type torque converter for an automatic transmission, the one described in Japanese Utility Model Publication No. 56-82345 is known as a prior art. The conventional torque converter includes a pump including a pump blade connected to an input shaft and a turbine including a turbine blade connected to an output shaft, and a fluid is interposed between the pump and the turbine. There is one that transmits the driving force of the shaft to the output shaft through a fluid, but a movable shield plate is attached to the pump of this torque converter, and the shield plate causes centrifugal force or high centrifugal force when the torque converter rotates at high speed. It is deflected outward in the radial direction of the torque converter by fluid pressure,
The flow passage cross-sectional area of the fluid is made wider than that at the time of low rotation. By doing so, the above-mentioned conventional technique can reduce the creep during idling or the engine torque during idling.

However, in the above-mentioned prior art, when the torque converter rotates at a high speed, the shielding plate projects from the inner peripheral surface of the pump, which causes a large turbulence of the fluid in the torque converter and a secondary flow. It becomes a factor that reduces the torque transmission efficiency.

Further, the above-mentioned prior art does not disclose a method of attaching the shield plate to the pump.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a variable torque capacity type torque converter which does not generate large turbulence of fluid in the torque converter or secondary flow.

Another object of the present invention is to provide a method of attaching a shield plate to a pump that does not cause large turbulence or secondary flow of fluid in the variable torque displacement type torque converter.

[0007]

In order to solve the above problems, in a first aspect of the present invention, a pump connected to an input shaft for transmitting a driving force from a prime mover, and a pump blade attached to the pump. A torque converter including a turbine connected to an output shaft for transmitting a driving force to a transmission, turbine blades attached to the turbine, and a shield plate attached to the pump to change a cross-sectional area of a fluid passage. The torque converter is characterized in that the pump is provided with a recess for storing the shield plate.

Further, in claim 2, a pump connected to the input shaft for transmitting the driving force from the prime mover, a pump blade attached to the pump, and a turbine connected to the output shaft for transmitting the driving force to the transmission. In a torque converter including a turbine blade attached to the turbine and a shield plate attached to the pump to change a cross-sectional area of a fluid passage, an attachment ear is provided on the shield plate, and the attachment ear is provided in the pump. The torque converter is characterized in that the pump blade is inserted into a slit formed in the above, and the pump blade is fitted into a gap formed by one wall of the slit and the shielding plate.

Further, in claim 3, a pump connected to the input shaft for transmitting the driving force from the prime mover, a pump blade attached to the pump, and a turbine connected to the output shaft for transmitting the driving force to the transmission. In a torque converter including a turbine blade attached to the turbine and a shield plate attached to the pump to change a flow passage cross-sectional area of a fluid, the shield plate connects a plurality of shield portions to each other. And a torque converter characterized in that the base is provided with a plurality of slots, and the pump blades are fitted into the slits provided in the pump after being inserted into the slots, respectively. did.

According to a fourth aspect of the present invention, there is provided a torque converter satisfying the third aspect, wherein the base portion has a ring shape.

[0011]

According to the above means, since the pump is provided with the recess for storing the shield plate, the shield plate does not protrude from the inner peripheral surface of the pump when the torque converter rotates at high speed, and the fluid in the torque converter is large. Turbulence and secondary flow are less likely to occur.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given below with reference to the drawings showing the present invention.

FIG. 1 is a front view showing only the pump side of the torque converter of the present invention, and FIG. 2 is a sectional view taken along line 2-2 of FIG. 1 and 2, the portion shown by the broken line represents the shape when the shielding plate is bent outward in the radius of the torque converter when the torque converter of the present invention rotates at high speed. 1 is shown in FIG.
Is a pump connected to an input shaft from a prime mover (not shown) at the left end thereof, and 2 is a pump blade 2 attached to the pump 1 by fitting a projection 2a in a slit 1a of the pump. On the other hand, the pump blade 2
In the left side of FIG. 2, the attachment piece 2b is inserted into the attachment hole 3a of the annular inner core 3 and then fixed by bending. In FIG. 2, the torque converter of the present invention is provided with at least a turbine and a turbine blade connected to the output shaft on the left side of the above-mentioned configuration, but these configurations are omitted because they are known configurations. .
A fluid is contained in the above-mentioned torque converter, and torque is transmitted from the input shaft to the output shaft. Furthermore,
A shield plate 4 is fixed to the inner peripheral surface of the pump 1 by mounting bolts 5. The shield plate is made of a spring material or the like, and has a shape represented by a solid line in FIGS. 1 and 2 when the torque converter is rotating at a low speed.
The effective area of the pump vane 2 in which the fluid in the torque converter circulates is reduced.

Here, a characteristic feature of the present invention is that a recess 1b is provided on the inner peripheral surface of the pump 1.

Next, the operation of the torque converter having the above structure will be described. When the torque converter according to the present invention is rotating at a low speed, since the shielding plate 4 is in the state disclosed in FIGS. 1 and 2, each flow passage cross-sectional area between the pump blades 2 is the same as the shielding plate in FIG. Since it is limited to the portion below the plate 4, the torque transmission capacity of the torque converter is reduced, and creep of the vehicle can be prevented. Further, the resistance received from the fluid of each pump blade 2 can be reduced, and the idling torque of the engine can be reduced. On the other hand, when the torque converter rotates at a high speed, the shielding plate 4 bends outward in the radial direction of the torque converter due to the centrifugal force and the pressure from the fluid, and has the shape shown by the broken lines in FIGS. . At this time, since the shielding plate 4 is completely stored in the recess 1b provided on the inner peripheral surface of the pump 1, the cross-sectional area of the fluid flow passage is maximized, and at the same time, the inner peripheral surface of the pump 1 is removed. Since it does not project, it is possible to suppress the occurrence of large turbulence and secondary flow in the fluid of the torque converter.

FIG. 3 is a view showing details of another invention of the torque converter, and FIG. 4 is a partial sectional view of FIG. Also in the present invention, the pump blades 12 and the shield plate 14 are attached to the inner peripheral surface of the pump 11 as well, but the feature of the present invention is that the shield plate 14 is provided with the mounting ear 14a and the inner peripheral surface of the pump 11 is provided. The point is that the pump blade 12 is fitted between the one wall 11b of the slit 11a and the mounting ear 14a. Desirably, a hook-shaped locking portion 14b is provided on the mounting ear 14a.

According to the above-mentioned structure, the shield plate can be attached to the pump at the same time as the pump blade, and the increase in the number of assembling steps due to the provision of the shield plate is almost eliminated. or,
Unlike the case where the shield plate and pump blade are assembled by welding or bolts, there are no protrusions on the inner peripheral surface of the pump, so large turbulence and secondary flow in the torque converter are suppressed, and torque transmission efficiency is reduced. Is good.

FIG. 5 is a diagram showing the structure of a shielding plate according to another invention. A feature of the present invention is that the shield plate 24 connects a plurality of shield portions 24a and the shield portion 24a to each other and the base portion 24.
It is composed of b and b. Further the base 2
4b is provided with a plurality of slots 24c, and when it is attached to the pump, as shown in FIG. 6, the plate-shaped base portion 24b is formed into an annular shape, and after the pump blades are respectively inserted into the slots 24c, Like the invention described above, it is fitted into a slit provided in the pump. According to the configuration of the present invention, not only the shield plate 24 can be attached to the pump at the same time as the pump blades, but also the labor for attaching a plurality of shield plates to the pump is not required.

FIG. 7 shows another embodiment of the shielding plate of the invention shown in FIGS. 5 and 6. The difference from those of FIGS. 5 and 6 is that the base portion 34b of the shielding plate 34 is formed into an annular shape by a pressing process. This is the point that was launched. With this configuration, the number of steps for manufacturing the shield plate can be further reduced, as compared with those in FIGS.

[0020]

As described above, according to the variable torque displacement type torque converter of the present invention, since there is no protrusion on the inner peripheral surface of the pump when the torque converter rotates at a low speed, the fluid in the torque converter is large. It is possible to provide a torque converter with high torque transmission efficiency by suppressing the occurrence of turbulence and secondary flow.

Further, since the steps required for attaching the shield plate and the pump blades can be shortened, a low cost variable torque capacity type torque converter can be provided.

[Brief description of drawings]

FIG. 1 is a pump side front view of a torque converter of the present invention.

FIG. 2 is a pump side sectional view of the torque converter of the present invention.

FIG. 3 is a detailed view of the torque converter of the present invention.

FIG. 4 is a detailed cross-sectional view of the torque converter of the present invention.

FIG. 5 is a diagram showing a shield plate of the torque converter of the present invention.

FIG. 6 is a diagram showing a shield plate of the torque converter of the present invention.

FIG. 7 is a diagram showing a shield plate of the torque converter of the present invention.

[Explanation of symbols]

1, 11 Pump 11a Slit 11b Single wall 1b Recess 2,2 Pump blade 4, 14, 24, 34 Shielding plate 14a Mounting ear 24a, 34a Shielding portion 24b, 34b Base 24c, 34c Slot

Claims (4)

[Claims] 1. A pump connected to an input shaft for transmitting driving force from a prime mover, pump blades attached to the pump, a turbine connected to an output shaft for transmitting driving force to a transmission, and attached to the turbine. Turbine blades,
A torque converter comprising a shield plate attached to the pump for changing a cross-sectional area of a fluid flow passage, wherein the pump is provided with a recess for storing the shield plate. 2. A pump connected to an input shaft for transmitting driving force from a prime mover, a pump blade attached to the pump, a turbine connected to an output shaft for transmitting driving force to a transmission, and attached to the turbine. Turbine blades,
In a torque converter provided with a shield plate attached to the pump to change the flow passage cross-sectional area of a fluid, the shield plate is provided with mounting ears, the mounting ears are inserted into slits provided in the pump, and further, A torque converter characterized in that a pump blade is fitted in a space formed by one wall of the slit and the shielding plate. 3. A pump connected to an input shaft for transmitting driving force from a prime mover, pump blades attached to the pump, a turbine connected to an output shaft for transmitting driving force to a transmission, and attached to the turbine. Turbine blades,
In a torque converter including a shield plate attached to the pump to change a flow passage cross-sectional area of a fluid, the shield plate includes a plurality of shield portions and a base portion connecting the shield portions to each other. Is provided with a plurality of slots, and each of the pump blades is fitted into a slit provided in the pump after being inserted into each of the slots. 4. The torque converter as claimed in claim 3, wherein the base portion has a ring shape.