JPH066798U - Lockup device for torque converter - Google Patents

Abstract

(57) [Summary] [Purpose] It has cooling properties and improves workability during assembly. This device is arranged such that it can be pressed against the front cover 1 so as to be movable in the axial direction, and has an oil lubrication hole 12c penetrating in the axial direction in a press contact portion 12d.
2, a coupling mechanism that couples the piston 12 and the turbine 3, and a groove 17 that axially penetrates in a wider area including the hole 12c of the piston 12, and is fixed to the pressure contact portion of the piston 12 with the front cover 1. The friction member 16 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lockup device for a torque converter, and more particularly to a lockup device for a torque converter arranged between an input side member and an output side member of the torque converter.

[0002]

[Prior art]

 Generally, a torque converter transmits power by liquid, so it can smoothly accelerate and decelerate. However, there is a drawback that energy loss occurs due to the slip of the liquid and the fuel consumption becomes poor. Therefore, some conventional torque converters are equipped with a lockup device that presses a piston against a front cover on the input side by hydraulic control to mechanically transmit power to an output side member. A friction member is fixed to the outer periphery of the piston on the front cover side.

This lockup device is arranged between the turbine connected to the output shaft and the front cover on the input member side. When the lockup device is not operated, hydraulic oil is introduced between the piston and the front cover so that there is a predetermined gap between them. On the other hand, during operation, the piston is pressed against the front cover by hydraulic control. As a result, the rotation of the front cover is directly transmitted to the output shaft via the piston.

In such a lock-up device, if the lock-up operation is frequently repeated, the friction portion generates heat and the friction member is easily worn. Therefore, as disclosed in Japanese Patent Laid-Open No. 3-209045, in order to cool the friction portion, for example, a fluid passage hole for hydraulic oil that penetrates the outer peripheral portion of the piston and the friction member is provided, and further, a radial direction or rotation In some cases, an oil groove for guiding hydraulic oil is provided to allow the lubricating oil to flow.

[0005]

In the above-described conventional configuration, when fixing the friction member to the piston, the through hole of the piston and the through portion of the friction member must be positioned with high precision and then fixed. Therefore, the work becomes complicated. Therefore, it is conceivable to form the through hole and the like after fixing the friction member to the piston, but the number of processing steps increases and the cost increases.

[0006]

[Means for Solving the Problems]

 A lockup device for a torque converter according to the present invention is a device arranged between an input side member and an output side member of a torque converter, and is arranged in an axial direction so that it can be pressed against a part of the input side member. A piston with an oil lubrication hole that penetrates in the axial direction on the outer periphery, a connecting mechanism that connects the piston and the output side member, and a shaft with a wider area including the piston hole. And a friction member fixed to a pressure contact portion of the piston with the input side member.

[0007]

[Action]

 In the lockup device for a torque converter of the present invention, when the piston moves toward the input side member, the friction member fixed to the pressure contact portion of the piston contacts the input side member. In this state, the rotational force of the input side member is transmitted to the output side member via the piston and the connecting mechanism. At this time, the working oil flows through the oil lubrication hole penetrating the piston and the penetrating portion of the friction member, and the friction member is cooled and lubricated.

In the present invention, since the penetrating portion of the friction member is formed to have a larger area including the hole of the piston, when the friction member is fixed to the piston during manufacturing, it is easy to position them. , Workability is good.

[0009]

【Example】

 FIG. 1 shows a torque converter in which an embodiment of the present invention is adopted (OO is the center line). In FIG. 1, this torque converter mainly includes a front cover 1, three types of impellers (pump 2, turbine 3, stator 4) housed in the front cover 1, and a lockup device 5. There is.

The front cover 1 has a weld bolt 6 connected to an input shaft (not shown) at its outer peripheral end. An impeller shell 1c is integrally fixed to the rear end (right end in FIG. 1) of the outer peripheral wall 1b of the front cover 1. Inside the impeller shell 1c, a pump 2 having a plurality of blades is arranged. A turbine 3 having a plurality of blades is arranged at a position facing the pump 2. The inner peripheral end of the turbine 3 is fixed to the flange portion 7 a of the turbine hub 7 with rivets 8. The turbine hub 7 has a spline 9 that engages with an output shaft (not shown) on the inner peripheral portion. A stator 4 is arranged between the inner peripheral portion of the pump 2 and the inner peripheral portion of the turbine 3.

The space inside the front cover 1 forms a hydraulic oil chamber 10 that houses three types of impellers (pump 2, turbine 3, stator 4). Hydraulic oil is supplied to the hydraulic oil chamber 10 through a hydraulic oil inlet 11 from a hydraulic control device (not shown). The lockup device 5 is arranged between the turbine 3 and the front cover 1, and has a piston 12 and a connecting mechanism. The piston 12 has a disk shape, and a central portion 12a and an outer peripheral portion 12b extend toward the turbine 3 side substantially parallel to the axis. The central portion 12a is axially slidably supported on the outer peripheral portion 7b of the turbine hub 7. A pressure contact portion 12d that contacts the side surface of the front cover 1 on the turbine 3 side is formed on the inner peripheral side of the outer peripheral portion 12b. A plurality of through holes 12c are formed in the press contact portion 12d at predetermined intervals in the circumferential direction. The holes 12c are for allowing the hydraulic oil to flow in the axial direction. A friction member 16 is fixed to the press contact portion 12d.

As shown in FIG. 2, the friction member 16 is a ring-shaped member composed of an outer peripheral member 16a and an inner peripheral member 16b. The outer peripheral member 16a and the inner peripheral member 16b are arranged with a predetermined width X therebetween. The hole 12c is located in the groove 17 formed between the outer peripheral member 16a and the inner peripheral member 16b, and the width X of the groove 17 is set to be larger than the diameter of the hole 12c.

The connecting mechanism is arranged on the inner peripheral side of the outer peripheral portion 12b. The connection mechanism is composed of a torsion spring 13, a retaining plate 14, and a driven plate 15. A plurality of torsion springs 13 are arranged so as to extend in the circumferential direction. The retaining plate 14 is fixed to the back surface of the piston 12, and its bent claw engages with the torsion spring 13. The torsion spring 13 is engaged with the outer peripheral bent end of the driven plate 15. As a result, the piston 12 and the turbine 3 are elastically connected in the circumferential direction. The inner peripheral end portion of the driven plate 15 is fixed to the flange portion 7 a of the turbine hub 7 with rivets 8.

In the torque converter of this embodiment, the torque of the engine is transmitted from the front cover 1 and the pump 2 to the turbine 3 via the hydraulic oil. The stator 4 acts to adjust the oil flow from the turbine 3 side to the pump 2 side so that a high torque ratio is obtained when the pump 2 rotates at high speed and the turbine 3 rotates at low speed. . The rotational force of the turbine 3 is transmitted to an output shaft (not shown) via the turbine hub 7.

When the output shaft rotates at a constant speed, the hydraulic oil in the hydraulic oil chamber 10a between the front cover 1 and the piston 12 is drained, and as a result, the piston 12 is pressed forward. Then, the friction member 16 of the piston 12 is pressed against the front cover 1. At this time, a frictional force is generated on the contact surfaces of both members, and heat is generated. On the other hand, the hydraulic oil circulates to the contact surface of the friction member 16 and the contact surface of the front cover 1 through the hole 12c provided in the press contact portion 12d of the piston 12 and the groove 17 between the friction members 16a and 16b. It will be. Therefore, the abutting surfaces of the friction member 16 and the front cover 1 are sufficiently cooled by the working oil flowing therethrough, and the wear of each member can be reduced by reducing the generated heat.

Since the groove 17 formed in the friction member 16 has a wider area than the hole 12c of the piston 12, the outer peripheral member 16a and the inner peripheral member 16b are displaced from the piston 12. Even if fixed, the holes 12c are less likely to be shielded. For this reason, the alignment at the time of assembly becomes easy. In addition, since the groove 17 is formed inside the friction member 16 and does not have an opening end in the radial direction, that is, the friction member 16 is connected in the circumferential direction, and there are no cuts or the like in the middle, so long-term Even if it is used, peeling of the friction member 16 does not easily occur.

[Other Embodiments] In the above embodiment, the annular groove 17 including the large and small ring-shaped members 16a and 16b is provided, but as shown in FIG. You may form the rectangular penetration part 21. The penetrating portion 21 is formed in a wider area including the hole 12c. In this case, since it is composed of one ring-shaped friction member 20, the assembling work is further simplified as compared with the above embodiment. Further, since the penetrating portion 21 is formed inside the friction member 20, peeling is unlikely to occur as in the above-described embodiment.

[0018]

[Effect of device]

 In the lockup device for a torque converter according to the present invention, the friction member is provided with a penetrating portion penetrating in the axial direction, and this penetrating portion has a larger area including the piston hole for oil lubrication penetrating in the axial direction. Since it is formed, it is easy to align the friction member with the piston during assembly.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a torque converter according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view taken along line II-II of FIG.

FIG. 3 is a partial vertical cross-sectional view of another embodiment corresponding to FIG.

[Explanation of symbols]

 1 Front Cover 5 Lockup Device 12 Piston 12c Hole 12d Pressure Contact Part 13 Torsion Spring 14 Retaining Plate 15 Driven Plate 16,20 Friction Member 17 Groove 21 Penetration Part

Claims (1)

[Scope of utility model registration request] 1. A lockup device for a torque converter arranged between an input side member and an output side member of a torque converter, wherein the lockup device is axially movable so as to be capable of pressure contact with a part of the input side member. And a piston having an oil lubrication hole that penetrates in the axial direction in the outer peripheral portion, a coupling mechanism that couples the piston and the output-side member, and a wider area including the piston hole in the axial direction. A lockup device for a torque converter, comprising: a friction member having a penetrating portion penetrating to the piston, and being fixed to a pressure contact portion of the piston with the input side member.