JP2527399Y2 - Suspension of torque converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a suspension device for a torque converter for suspending a torque converter on a transmission side.

(Conventional technology) Large torque converters used for large vehicles such as trucks and buses are supported on the transmission side rather than on the crankshaft of the engine, as in passenger cars. The drive unit is not overloaded and has excellent durability. Especially in the case of a structure that drives the PTO (Power Take Off) axis with a torque converter,
Unless the torque converter is supported on the transmission side to prevent movement in the axial direction, the durability of the gear driving the PTO shaft decreases.

As a suspension device for such a torque converter, a suspension device as shown in FIG. 2 has been generally known. That is, the gear 53 is formed at the rear end of the impeller hub 52 fixed to the impeller 51 of the torque converter, and a part of the engine power is extracted from the gear 53. A fixed cylindrical shaft 54 fixed to the transmission housing and an impeller hub
A seal ring 55 is interposed between the impeller hub and the impeller hub.
A ball bearing 56 for preventing the impeller hub 52 from moving in the axial direction is provided on the inner periphery of the shaft 52.

However, although the ball bearing 56 has the advantage of being able to support loads in both the thrust and radial directions, since the outer diameter and the width in the axial direction are large, the circumference of the oil seal 57 between the torque converter side and the transmission side is large. In order to reduce the speed, it is necessary to arrange the oil seal 57 in parallel with the ball bearing 56, and the length of the entire automatic transmission in the axial direction becomes longer. Also, when disassembling and assembling the entire automatic transmission, it is necessary to press out and press in the inner race 59 of the ball bearing 56 from the fixed cylindrical shaft 54, so that the disassembling and assembling work is difficult.

Therefore, as shown in FIG. 3, a gear 64 is fixed to an impeller hub 63 fixed to an impeller 62 of a torque converter 61, and a radial sliding bearing 66 is provided between the gear 64 and the fixed cylinder shaft 65.
Snap ring 67 and thrust bearing 6 on the outer periphery of fixed cylindrical shaft 65
8 and 69, and a structure is proposed in which the inner race 71 of the fixed stator 70 and the gear 64 are sandwiched between the snap ring 67 and the thrust bearing 69 (see Japanese Utility Model Application Laid-Open No. 62-80068). . The fixed cylinder shaft 65 is a housing of the transmission 72.
Fixed to 73.

(Problem to be Solved by the Invention) In the above-described conventional configuration, the leftward movement of the inner race 71 in FIG. 3 is prevented by the snap ring 67, and the rightward movement is prevented via the thrust bearing 69 through the fixed cylindrical shaft 65. Therefore, two thrust bearings 68 and 69 are required, and the manufacturing cost is high.

(Means for Solving the Problems) In order to solve the above problems, the suspension device of the torque converter according to the present invention is fixed to the engine-side front cover 7 via the impeller 2 and is mounted on the outer periphery opposite to the front cover 7.
The inner circumference of the impeller hub 24 having the PTO gear 28 and the inner circumference of the inner race 18 of the one-way clutch 17 of the stator 4 located between the front cover 7 and the impeller hub 24 are connected to the transmission 20 on the side opposite to the engine. Housing 21
In the torque converter opposed to the outer periphery of the fixed cylindrical shaft 19 fixed to the front cover 7 side of the fixed cylindrical shaft 19, the outer race of the fixed cylindrical shaft 19 is abutted on the front cover 7 side of the inner race 18. A snap ring 22 fitted in an annular groove at an end, and a thrust bearing 26 that abuts both the end face of the inner race 18 on the side of the impeller hub 24 and the end face of the impeller hub 24 on the side of the inner race 18 are provided. A stepped portion that engages with both the outer periphery of the fixed cylindrical shaft 19 to be splined and the inner periphery of the inner race 18 in the axial direction to prevent the inner race 18 from moving toward the impeller hub 24. 18a and 19a are formed, and a radial sliding bearing 25 is provided between the outer periphery of the fixed cylindrical shaft 19 and the inner periphery of the impeller hub 24, and is opposed to the inner race 18 side of the impeller hub 24. Wherein at least the impeller 2 to move to the front cover 7 and through the needle bearing 23 and the inner race 18 fixed cylinder shaft 19
The stepped portions 18a, 19a are used to block the light.

(Operation) The movement of the impeller hub 24 to the side opposite to the side of the inner race 18 is prevented by the steps 18a, 19a of the inner race 18 and the fixed cylindrical shaft 19 via at least the impeller 2, the front cover 7, and the needle bearing 23. You.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a sectional view of a main part of an automatic transmission having a suspension device for a torque converter according to an embodiment of the present invention. The torque converter 1 includes an impeller 2, a turbine 3, a fixed stator 4 and a reverse rotation stator 5. I have. The outer peripheral edge of the impeller shell 2a of the impeller 2 is connected to the outer peripheral edge of the front cover 7 by a plurality of bolts 6, and the front cover 7 receives rotational power transmitted from an output shaft of the engine (not shown). A well-known lock-up clutch 8 is provided between the front cover 7 and the turbine 3. The inner circumference of the hub 10 of the turbine 3 and the outer circumference of one end of the turbine shaft 12 are circumferentially engaged via splines. A well-known one-way clutch 13 is interposed between the inner race 14 and the outer race 14 a of the reverse rotation stator 5, and a stator shaft 15 that is loosely fitted on the inner circumference of the inner race 14 of the reverse rotation stator 5 and the outer circumference of the turbine shaft 12. Is circumferentially engaged with the outer periphery of one end via a spline. Front cover 7 and hub 10
Between the needle bearing 16 and the radial sliding bearing 11
And are interposed. The hub 10 of the turbine 3 is in sliding contact with the base 5a of the reverse rotation stator 5. Hub 10 at base 5a
An oil groove 5b is provided on the contact surface with the oil groove 5b. Reverse rotation stator 5
A gap 30 is provided in the left-right direction of the inner race 14 and the base 5a as viewed in FIG. 1, and the outer race 14a is in contact with the base 5a. A well-known one-way clutch 17 is interposed between the outer race 33 and the inner race 18 of the fixed stator 4, and a fixed cylindrical shaft that is loosely fitted on the inner periphery of the inner race 18 of the fixed stator 4 and the outer periphery of the stator shaft 15. The outer periphery of the one end of 19 is circumferentially engaged via a spline. The fixed cylinder shaft 19 is connected to the housing 21 of the transmission 20 by a plurality of bolts (not shown). A snap ring 22 serving as a stopper for preventing the inner race 18 from moving toward the front cover 7 is mounted in an annular groove on one end of the fixed cylindrical shaft 19, and the snap ring 22 is connected to one end surface of the inner race 18. Is in contact with Steps 18a and 19a are formed on the inner periphery of the inner race 18 and the outer periphery of the fixed cylindrical shaft 19 to prevent the inner race 18 from moving to the side opposite to the front cover 7 side. . The steps 18a, 19a
It can be obtained by forming the end faces of the spline grooves provided on the inner periphery of the inner race 18 and the outer periphery of the fixed cylinder shaft 19 at right angles to the axis of the fixed cylinder shaft 19. A member 31 is inserted between the outer race 14a and the inner race 14 of the reverse rotation stator 5, and a member 32 is inserted between the outer race 33 and the inner race 18 which are press-fitted into the fixed stator 4. The needle bearing 23 is interposed between the member 33 and the member 32. An oil groove 34 is provided at a portion of the fixed stator 4 that contacts the inner race 18. One end of an impeller hub 24 is fixed to the inner periphery of the impeller shell 2a, for example, by welding, and a radial slide bearing 25 is interposed between the inner periphery of the impeller hub 24 and the outer periphery of the fixed cylindrical shaft 19. A thrust bearing 26 is interposed between the inner race 18 and the impeller hub 24, a roller 26a of the thrust bearing 26 abuts on the other end surface of the inner race 18, and an inner race 26b of the thrust bearing 26 is connected to the impeller hub 24. It is in contact with the end face. An oil seal 27 is interposed between the inner periphery of the partition 21a fixed to the housing 21 and the outer periphery of the impeller hub 24. A PTO gear 28 is formed on the outer periphery of the other end of the impeller hub 24, and although not shown, the gear 28 drives the PTO shaft through a plurality of intermediate gears, and controls a charging pump through a drive gear. Drive. The turbine shaft 12 and the stator shaft 15 drive predetermined gears in the planetary gear mechanism of the transmission 20. Since the configuration of the transmission 20 and the passage of the pressure oil of the torque converter 1 are not directly related to the gist of the present invention, the description is omitted.

Next, the operation will be described. The radial load of the torque converter 1 is supported by a radial slide bearing 25. The pressure oil in the torque converter 1 is prevented from leaking to the transmission 20 by the radial slide bearing 25. When a leftward load in FIG. 1 is applied to the torque converter 1, the impeller hub 24 pushes the inner race 18 to the left via the thrust bearing 26, but the inner race 18 moves to the left by the snap ring 22. Is prevented, the torque converter 1 does not move leftward. When a rightward load in FIG. 1 is applied to the torque converter 1, the impeller hub 24 is connected to the impeller shell.
2a, front cover 7, needle bearing 16, hub 10
And the outer race 14a, the base 5a, and the member 3 of the reverse-rotating stator 5.
1, the needle bearing 23, the outer race 33 of the fixed stator 4, and the inner race 18 through the fixed stator 4.
Is pushed rightward, but since the inner race 18 is prevented from moving rightward by the steps 18a and 19a, the torque converter 1 does not move rightward. Therefore, there is no need to provide the thrust bearing 69 as in the conventional apparatus shown in FIG. 3, and the length of the automatic transmission in the axial direction can be further reduced, and the disassembling and assembling work can be performed more easily, and the manufacturing cost can be further reduced. it can. Further, since the snap ring 22 is provided at the left end of the fixed cylinder shaft 19, the torque converter 1 can be disassembled from the front side (left side in the figure), which is practical.

(Another embodiment) In the above embodiment, the torque converter 1 having the reverse rotation stator 5 was described. However, the present invention is not limited to such a configuration, and the present invention is applied to a torque converter without the reverse rotation stator 5. Of course, it is applicable.

Further, in the above embodiment, the inner periphery of the impeller hub 24 fixed to the engine-side front cover 7 via the impeller 2 and having the PTO gear 28 on the outer periphery opposite to the front cover 7, the front cover 7 and the impeller hub 24 Between the inner race 18 of the one-way clutch 17 of the stator 4 and the transmission 20 on the opposite side of the engine.
In the torque converter opposed to the outer periphery of the fixed cylindrical shaft 19 fixed to the housing 21, the front surface of the fixed cylindrical shaft 19 is brought into contact with the outer periphery of the fixed cylindrical shaft 19 on the front cover 7 side of the inner race 18. A snap ring 22 fitted in an annular groove at an end of the cover 7; an end face of the inner race 18 on the impeller hub 24 side;
A thrust bearing 26 is provided to abut both the end face of the inner race 18 on the side of the inner race 18 and the outer periphery of the fixed cylindrical shaft 19 and the inner periphery of the inner race 18 that are spline-fitted to each other. The inner race
Step 18 for preventing the movement of 18 to the impeller hub 24 side
a, 19a, and a radial sliding bearing 25 is provided between the outer periphery of the fixed cylindrical shaft 19 and the inner periphery of the impeller hub 24 to move the impeller hub 24 to the side opposite to the inner race 18 side. A torque converter suspension device characterized in that the inner race 18 and the stepped portions 18a and 19a of the fixed cylinder shaft 19 are prevented from passing through at least the impeller 2, the front cover 7 and the needle bearing 23. However, the present invention is not limited to such a configuration. For example, a configuration in which a ring-shaped gear is fixed to the impeller hub 24 may be used.

(Effect of the Invention) As described above, the present invention is fixed to the engine-side front cover 7 via the impeller 2 and the front cover 7
The inner periphery of an impeller hub 24 having a PTO gear 28 on the outer periphery opposite to the inner periphery of the inner race 18 of the one-way clutch 17 of the stator 4 located between the front cover 7 and the impeller hub 24 In the torque converter opposed to the outer periphery of the fixed cylindrical shaft 19 fixed to the housing 21 of the housing 20, the fixed cylindrical shaft 19 is so fixed as to abut on the outer periphery of the fixed cylindrical shaft 19 on the front cover 7 side of the inner race 18. A snap ring 22 fitted in an annular groove at an end of the front cover 7, a thrust bearing 26 abutting on both the end face of the inner race 18 on the impeller hub 24 side and the end face of the impeller hub 24 on the inner race 18 side. The inner race is engaged with both the outer periphery of the fixed cylindrical shaft 19 and the inner periphery of the inner race 18 that are spline-fitted with each other in the axial direction. Steps 18a and 19a are formed to prevent the movement of the impeller hub 24 to the side of the impeller hub 24, and a radial sliding bearing 25 is provided between the outer periphery of the fixed cylindrical shaft 19 and the inner periphery of the impeller hub 24. A movement of the inner race 18 and the stepped portions 18a, 19a of the fixed cylindrical shaft 19 through at least the impeller 2, the front cover 7, and the needle bearing 23 via the inner race 18 and the needle bearing 23. A suspension device for a torque converter, characterized in that: Thus, there is no need to provide a thrust bearing 69 for preventing the impeller hub 63 from moving to the side opposite to the inner race 71 side as in the conventional device (FIG. 3). Because it can be reduced from two to one,
The length of the automatic transmission in the axial direction can be further reduced, the disassembling and assembling operations can be performed more easily, and the manufacturing cost can be further reduced. In addition, the snap ring 22 has a fixed cylindrical shaft.
19, the torque converter 1
Can be disassembled from the front side (left side in the figure), which is practical.

In short, the present invention relates to the inner race 18 of the fixed stator 4.
Steps 18a and 19a are provided on the impeller hub 24 side to prevent movement toward the impeller hub 24, and the front cover 7
This is fixed to the transmission housing 21 via a fixed cylindrical shaft 19 so that a snap ring 22 is attached to the side to prevent movement in the direction of the front cover 7. When fixing the torque converter to the transmission (transmission), compact fixing is important not only in shortening the axial direction but also in terms of vibration as a rotating member with imbalance. In this regard, in the present invention, the thrust bearing 26
Is installed between the impeller hub 24 having the radial sliding bearing 25 and the inner race 18 of the stator 4, and the inner race
It has a unique structure in which only 18 is fixed to the transmission housing 21 by the steps 18a, 19a and the snap ring 22, so that the important purpose of compactly supporting the torque converter on the transmission housing 21 can be easily achieved. Can be.

In the double-sided snap ring method, a pair of snap ring grooves (annular grooves) is required to fix a pair of snap rings, and it is necessary to form a groove on the outer diameter of the fixed cylindrical shaft 19, and the end of the groove has an edge. It becomes a shape and becomes a notch state. The stationary stator 4 receives a torque of one to two times the torque of the prime mover that normally drives the torque converter, and the force is applied to the stationary cylinder shaft 19. Therefore, when a snap ring is used, it is necessary to increase the outer diameter of the fixed cylinder shaft because the strength of the groove of the snap ring is lower than that of the stepped portions 18a and 19a of the present invention. Since there is no large space between the shafts, providing a snap ring may reduce the space.) This is a major drawback when the stator is provided with a one-way clutch of the double-sided snap ring type as described above. In addition to this, there is a large difference between the case of using the snap ring such as the high cost of the snap ring and the space of the snap ring and the case of using the steps 18a and 19a of the present invention (the snap ring groove at the end of the present invention) Does not apply torque).

For vehicles such as garbage trucks and dump trucks that use power for work other than running, the engine power is extracted from the transmission.
It is common to attach an O device. In this method, there is a method of taking out from the rotating shaft of the turbine of the torque converter,
There are two types of extraction from an impeller directly connected to the engine, but an engine-impeller drive system that can always take out a certain rotation or more when working while traveling is preferable. When driving the gear on the PTO side installed on the transmission side with the gear attached to the impeller, if the torque converter is fixed to the crankshaft of the engine, the gear contact will not be constant. Normally, in order to absorb the misalignment of the crankshaft and the torque converter, a flex plate that flexes to some extent in the axial direction is used to absorb the misalignment. During running, the torque converter receives different thrust forces due to changes in internal pressure, so the axial position moves within a certain range and the PTO
The drive gears also move, causing a bad situation due to the meshing of the gears. When a helical gear is used for this gear, a large thrust force is applied to the flex plate, and there is a risk that the flex plate may be damaged or a bearing of an engine crankshaft may be damaged. Therefore, in a torque converter in which a gear for driving the PTO is provided on the impeller, the torque converter is generally fixed to the transmission side, and the present invention is particularly suitable for such a case.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part of an automatic transmission having a suspension of a torque converter according to an embodiment of the present invention. FIGS. 2 and 3 are schematic sectional views of suspensions of a conventional torque converter. . 2 impeller, 4 fixed stator (stator), 7 front cover, 18 inner race, 18a, 19a step, 1
9 ... fixed cylindrical shaft, 20 ... transmission, 21 ... housing, 22 ... snap ring, 24 ... impeller hub, 25 ... radial sliding bearing, 26 ... thrust bearing.

Claims (1)

(57) [Scope of request for utility model registration] A PT is fixed to an engine-side front cover via an impeller.
The inner periphery of the impeller hub 24 having the O gear 28 and the inner periphery of the inner race 18 of the one-way clutch 17 of the stator 4 located between the front cover 7 and the impeller hub 24 are connected to the transmission 20 on the side opposite to the engine. In the torque converter opposed to the outer periphery of the fixed cylindrical shaft 19 fixed to the housing 21, the front surface of the fixed cylindrical shaft 19 is brought into contact with the outer periphery of the fixed cylindrical shaft 19 on the front cover 7 side of the inner race 18. A snap ring 22 fitted in an annular groove at an end of the cover 7 and a thrust bearing 26 abutting on both the end face of the inner race 18 on the impeller hub 24 side and the end face of the impeller hub 24 on the inner race 18 side. The inner race is engaged with both the outer periphery of the fixed cylindrical shaft 19 and the inner periphery of the inner race 18 which are spline-fitted with each other in the axial direction. Steps 18a and 19a are formed to prevent the movement of the impeller hub 24 to the side of the impeller hub 24, and a radial sliding bearing 25 is provided between the outer periphery of the fixed cylindrical shaft 19 and the inner periphery of the impeller hub 24. A movement of the inner race 18 and the stepped portions 18a, 19a of the fixed cylindrical shaft 19 through at least the impeller 2, the front cover 7, and the needle bearing 23 via the inner race 18 and the needle bearing 23. A suspension device for a torque converter, comprising: