KR102206221B1 - Torque convertor for vehicle - Google Patents

Abstract

Disclosed is a torque convertor for a vehicle. A torque convertor for a vehicle according to an embodiment of the present invention comprises: a front cover; an impeller coupled to the front cover and rotating together; a turbine disposed at a position facing the impeller; a reactor positioned between the impeller and the turbine to change the flow of oil from the turbine toward the impeller; a lock-up clutch having a piston directly connecting the front cover and the turbine; and a torsional damper coupled to the lock-up clutch to absorb shock and vibration acting in a rotational direction. The torsional damper includes: a driven plate connected to an output side; a retaining plate coupled to the driven plate and connected to the lock-up clutch; and a first torsion spring disposed on the inner circumferential surface of the driven plate between the driven plate and the retaining plate, having one end fixed to the driven plate and the other end fixed to the retaining plate, and providing an elastic force in the rotational direction.

Description

Vehicle torque converter {TORQUE CONVERTOR FOR VEHICLE}

The present invention relates to a torque converter for a vehicle, and more particularly, to a torque converter for a vehicle that improves design freedom by securing an internal space while simplifying the manufacturing process and reducing manufacturing cost by reducing the components of a torsion damper. will be.

In general, a torque converter is installed between an engine and a transmission of a vehicle and transmits the driving force of the engine to a transmission using a fluid. Such a torque converter includes an impeller that rotates by receiving the driving force of an engine, a turbine that is rotated by oil discharged from the impeller, and a reactor that increases the rate of change of torque by directing the flow of oil returned to the impeller in the direction of rotation of the impeller ( Also referred to as'stator').

The torque converter is equipped with a lock-up clutch (also referred to as a'damper clutch'), which is a means of directly connecting the engine and the transmission, as the power transmission efficiency may decrease when the load acting on the engine increases. The lock-up clutch is disposed between the turbine and the front cover directly connected to the engine so that the rotational power of the engine can be transmitted directly to the turbine.

Such a lock-up clutch includes a piston axially movable on the turbine shaft. And the piston is coupled to the friction material in frictional contact with the front cover. And the piston is coupled with a torsion damper that can absorb shock and vibration acting in the direction of rotation of the shaft when the friction material is coupled to the front cover.

In the above-described torsion damper, the elastic members formed of compression coil springs capable of absorbing torsional torque when the lock-up clutch is operated so that the driving force of the engine can be directly transmitted to the transmission through the turbine are rotated from the outer peripheral surface side of the retaining plate. It is installed as.

In a torque converter according to the prior art, the elastic members installed in the torsion damper are configured to absorb vibrations caused by torsional torque generated from the lock-up clutch while repeating tension and compression during operation of the torque converter. It is difficult to improve the vibration absorption performance and efficiency, and there is a problem that the vibration attenuation performance decreases as time passes due to durability problems of the elastic members.

In addition, in a conventional torsion damper, a plurality of elastic members formed of a compression coil spring must be mounted along the circumferential direction of the retaining plate. As the components of the torsion damper increase, the assembly and manufacturing process becomes complicated, It also has a problem of increasing cost.

The matters described in this background are prepared to enhance an understanding of the background of the invention, and may include matters other than those of the prior art known to those of ordinary skill in the field to which this technology belongs.

Accordingly, the present invention was invented to solve the above-described problems, and the problem to be solved by the present invention is to simplify the manufacturing process by reducing the components of the torsion damper, and to reduce the manufacturing cost while securing the internal space. It is intended to provide a torque converter for vehicles that improves design freedom.

A torque converter for a vehicle according to an embodiment of the present invention for achieving this object includes a front cover; An impeller coupled to the front cover and rotating together; A turbine disposed at a position facing the impeller; A reactor positioned between the impeller and the turbine to change the flow of oil from the turbine toward the impeller; A lock-up clutch provided with a piston directly connecting the front cover and the turbine; And a torsion damper coupled to the lock-up clutch to absorb shock and vibration acting in a rotation direction. Including, the torsion damper is a driven plate connected to the output side; A retaining plate coupled to the driven plate and connected to the lock-up clutch; And a first torsion disposed between the driven plate and the retaining plate on the inner circumferential surface of the driven plate, one end fixed to the driven plate, the other end fixed to the retaining plate, and providing elastic force in the rotational direction. spring; It may include.

Between the driven plate and the retaining plate, it is disposed on the inner circumferential surface of the retaining plate from the opposite side of the turbine based on the axial direction, and one end is fixed to the retaining plate and the other end is fixed to the driven plate to rotate A second torsion spring that provides an elastic force may be provided.

The driven plate may further include a plurality of inserts integrally protruding toward the front cover based on an axial direction, formed at a position spaced apart from a set angle along a circumferential direction, and inserted into the retaining plate.

Among the insertion portions, one insertion portion may have a fixing groove fixed in a state in which the other end of the second torsion spring disposed on the front cover side is inserted based on the axial direction.

The retaining plate includes an insertion hole formed at a position spaced apart from each other at a set angle along a circumferential direction corresponding to the insertion portions; A locking groove formed on one side of an outer circumferential surface corresponding to the other end of the first torsion spring and supported by being caught while the other end of the first torsion spring is inserted; And a fixing hole formed between the adjacent insertion holes among the insertion holes corresponding to one end of the second torsion spring, and fixed in a state in which one end of the second torsion spring is inserted. It may include.

The locking groove is formed on the outer circumferential surface of the retaining plate, the opening through which the other end of the first torsion spring is inserted; And a locking portion spaced apart from the opening toward the center of the retaining plate and connected to the opening at a predetermined angle along the circumferential direction, and supported by the other end of the first torsion spring. It may include.

In the driven plate, a support groove may be formed on an outer peripheral surface so that one end of the first torsion spring is inserted and supported.

The first and second torsion springs may be torsion springs.

The first torsion spring may have a spring constant different from that of the second torsion spring.

The first and second torsion springs may be disposed at positions in which one end formed toward the turbine and the other end formed toward the front cover face each other in a circumferential direction.

The lock-up clutch includes a first clutch drum coupled to the front cover; At least one first friction plate coupled to the first clutch drum and moving in an axial direction by the piston; A second clutch drum coupled to the retaining plate; And at least one second friction plate coupled to the second clutch drum and disposed between the first friction plate and the second clutch drum to move in an axial direction. It may include.

As described above, according to the torque converter for a vehicle according to an exemplary embodiment of the present invention, the components of the torsion damper are reduced to simplify the manufacturing process and reduce manufacturing cost.

In addition, the present invention has the effect of improving design freedom by securing the internal space of the torque converter by reducing the length of the torsion damper in the axial direction compared to the prior art.

In addition, the present invention has the effect of reducing hysteresis torque while increasing the durability of the elastic member by preventing the elastic member from being separated from the driven plate and the retaining plate or from generating dynamic friction when the torsion damper is operated.

Furthermore, the present invention can prevent the torsional torque of the torsion damper from being reduced by reducing the hysterical torque of the elastic member and increasing the durability, and has the effect of increasing the overall marketability of the torque converter.

1 is a cross-sectional view of a vehicle torque converter according to an exemplary embodiment of the present invention cut in the axial direction.
2 is a front perspective view of a torsion damper applied to a torque converter for a vehicle according to an embodiment of the present invention.
3 is a rear view of a torsion damper applied to a torque converter for a vehicle according to an embodiment of the present invention.
4 is a partial cut-away perspective view taken along line AA of FIG. 2.
5 is an exploded perspective view of a torsion damper according to an embodiment of the present invention.
6 is a rear perspective view of a driven plate in a torsion damper applied to a torque converter for a vehicle according to an embodiment of the present invention.
7 is a perspective view of a retaining plate in a torsion damper applied to a torque converter for a vehicle according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, since the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, they can be replaced at the time of application. It should be understood that there may be various equivalents and variations.

In order to clearly describe the present invention, parts irrelevant to the description have been omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

Since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to what is shown in the drawings, and the thickness is enlarged to clearly express various parts and regions.

And throughout the specification, when a certain part "includes" a certain component, this means that other components may be further included rather than excluding other components unless otherwise stated.

In addition, terms such as "...unit", "...means", "...part" and "...member" described in the specification refer to a unit of a comprehensive constitution that performs at least one function or operation. it means.

1 is a cross-sectional view of a vehicle torque converter according to an embodiment of the present invention cut in the axial direction, FIG. 2 is a front perspective view of a torsion damper applied to a vehicle torque converter according to an embodiment of the present invention, and FIG. A rear view of a torsion damper applied to a torque converter for a vehicle according to an embodiment of the present invention, FIG. 4 is a partially cutaway perspective view taken along line AA of FIG. 2, and FIG. 5 is an exploded view of a torsion damper according to an embodiment of the present invention. 6 is a rear perspective view of a driven plate in a torsion damper applied to a vehicle torque converter according to an embodiment of the present invention, and FIG. 7 is a rear perspective view of a driven plate in a torsion damper applied to a vehicle torque converter according to an embodiment of the present invention. It is a perspective view of the retaining plate.

1 is a half sectional view for explaining an embodiment of the present invention, showing a torque converter for a vehicle according to the embodiment of the present invention.

The vehicle torque converter according to the embodiment of the present invention includes a front cover 1 connected to the crankshaft (input side) on the engine side and rotating, an impeller 3 connected to the front cover 1 and rotating together, and the impeller 3 A turbine 5 disposed at a position facing the and a reactor disposed between the impeller 3 and the turbine 5 to change the flow of oil from the turbine 5 and transfer it to the impeller 3 ( 7, or also referred to as'stator').

The reactor 7 that delivers oil to the impeller 3 has the same rotational center as the front cover 1. And a lock-up clutch 9 used as a means for directly connecting the engine and the transmission is disposed between the front cover 1 and the turbine 5.

The lock-up clutch 9 has a piston 11 that has a substantially disk shape. In addition, the piston 11 can be rotated in the direction of the center of the shaft and is arranged to be moved in the axial direction.

On the other hand, the lock-up clutch 9 is coupled to a torsion damper (20, Torsional damper) that serves to absorb the torsional force acting in the rotational direction of the shaft and attenuating vibration.

Here, it is preferable that the lock-up clutch 9 applied to the embodiment of the present invention is made of a multi-plate clutch.

The lock-up clutch 9 includes a first clutch drum 13, a second clutch drum 15, a first friction plate 17, and a second friction plate 19 coupled to the front cover 1 do.

The first clutch drum 13 is coupled to the front cover 1 and has a cylindrical shape and is disposed in the axial direction.

In addition, the first clutch drum 13 is provided with a fitting hole through which the first friction plate 17 can be fitted on an inner circumferential surface. The first friction plate 17 is provided with fitting protrusions on its outer peripheral surface side. These fitting protrusions can be inserted into the fitting hole and moved in the axial direction.

The fitting hole of the first clutch drum 13 has an opening at one side in the axial direction and penetrates in a radial direction with respect to the axis. The first friction plate 17 may be moved in the axial direction by the piston 11.

In this embodiment, the second clutch drum 15 is disposed at a position spaced apart from the first clutch drum 13 by a certain distance. The second clutch drum 15 is coupled to the torsion damper 20.

Another groove through which the second friction plate 19 can be inserted is provided in the second clutch drum 15. The second friction plate 19 is coupled to the second clutch drum 15 and is disposed between the first friction plate 17 and the second clutch drum 15 to move in the axial direction.

In the embodiment of the present invention, the second clutch drum 15 may also have another fitting hole penetrated like the first clutch drum 13, and another fitting hole is provided on the inner circumferential side of the second friction plate 19. The protrusion may be provided in the axial direction.

Referring to FIG. 2, the torsion damper 20 may include a driven plate 21, a retaining plate 23, and a first torsion spring 25, as shown in FIGS. 1 to 5. have.

First, the driven plate 21 has a rotation center opened, has a certain length in an axial direction, and is coupled to the turbine 5 connected to an input shaft (not shown) of a transmission that is an output side.

The driven plate 21 may be formed in a ring shape in which one surface facing the turbine 5 is closed and the other surface facing the front cover 1 is opened.

In this embodiment, the retaining plate 23 is coupled to the driven plate 21 and is coupled to the lock-up clutch 9.

The retaining plate 23 may be coupled to the second clutch drum 15 by rivets or the like.

Here, the driven plate 21 is integrally protruded toward the front cover 1 based on the axial direction, is formed at a position separated by a set angle along the circumferential direction, and inserted into the retaining plate 23 It may further include a plurality of insertion portions (21a).

The insertion portions 21a may be formed at positions spaced apart at an angle of 120° along the circumferential direction of the driven plate 21.

In addition, the retaining plate 23 may have an insertion hole 23a formed at a position spaced apart from the retaining plate 23 at a set angle along the circumferential direction corresponding to the insertion portions 21a.

The insertion holes 23a may be respectively formed at positions spaced apart at an angle of 120° along the circumferential direction of the retaining plate 23 in correspondence with the insertion part 21a.

In this embodiment, the first torsion spring 25 is disposed on the inner peripheral surface of the driven plate 21 between the driven plate 21 and the retaining plate 23. One end of the first torsion spring 25 is fixed to the driven plate 21 and the other end is fixed to the retaining plate 23 to provide elastic force to the torsion damper 20 in the rotational direction. .

Here, in the driven plate 21, as shown in FIG. 6, a support groove 21b may be formed on an outer circumferential surface so that one end of the first torsion spring 25 is inserted and supported.

The support groove 21b may be formed to have a set length from the front cover 1 toward the turbine 5 in the axial direction on the outer circumferential surface of the driven plate 21.

In addition, the retaining plate 23 is formed on one side of the outer circumferential surface corresponding to the other end of the first torsion spring 25, as shown in FIG. 7, and the other end of the first torsion spring 25 is inserted. It may further include a locking groove (23b) that is caught and supported in the state.

The locking groove 23b may include an opening 24a and a locking portion 24b.

First, the opening 24a is formed on the outer circumferential surface of the retaining plate 23 so that the other end of the first torsion spring 25 is inserted.

The locking part 24b is spaced apart from the opening 24a toward the center of the retaining plate 23 at a set interval, and is connected to the opening 24a at a position spaced apart from the opening 24a at a set angle along the circumferential direction, and the The other end of the first torsion spring 25 may be caught and supported.

Accordingly, the first torsion spring 25 is supported by the driven plate 21 with one end inserted into the support groove 21b, and the other end thereof is inserted into the opening 24a and the locking portion ( By being caught in 24b), it may be supported by the retaining plate 23 through the locking groove 23b.

Meanwhile, the torsion damper 20 may further include a second torsion spring 27.

The second torsion spring 27 may be provided radially inside the first torsion spring 25 between the driven plate 21 and the retaining plate 23, and the axial direction It is disposed on the inner peripheral surface of the retaining plate 23 on the opposite side of the turbine.

One end of the second torsion spring 27 is fixed to the retaining plate 23 and the other end of the second torsion spring 27 is fixed to the driven plate 21 to provide elastic force to the torsion damper 20 in the rotational direction.

Here, the retaining plate 23 corresponds to one end of the second torsion spring 27, among the insertion holes 23a, of the neighboring insertion holes 23a, as shown in FIG. 7. It is formed between, and may further include a fixing hole (23c) fixed in a state in which one end of the second torsion spring 27 is inserted.

In addition, among the insertion portions 21a, the other end of the second torsion spring 27 disposed on the front cover 1 side is fixed in the inserted state in one of the insertion portions 21a. The fixing groove 21c may be formed.

Accordingly, the second torsion spring 27 is fixed with one end inserted into the fixing hole 23c and supported by the retaining plate 23, and the other end is inserted into the fixing groove 21c. It may be fixed in a state and supported by the driven plate 21.

In addition, the first and second torsion springs (25, 27) are at positions where each one end formed toward the turbine 5 and the other end formed toward the front cover 1 face each other in the circumferential direction. Can be placed.

That is, the first and second torsion springs 25 and 27 are overlapped in a ring shape so that the circular coils have elastic force, and the driven plate 21 and the retaining plate ( By being connected to each of 23), it is possible to provide an elastic force to the driven plate 21 and the retaining plate 23.

Here, the first torsion spring 25 may have a spring constant different from that of the second torsion spring 27.

Accordingly, the first and second torsion springs 25 and 27 may absorb vibrations and shocks by exerting elastic force in different vibration frequency regions in the rotation direction.

In other words, the torsion damper 20 is connected to the driven plate 21 and the retaining plate 23 through the first torsion spring 25 and the second torsion spring 27, By using the elastic force of the first and second torsion springs 27, it is possible to efficiently absorb and reduce vibrations and shocks generated in the rotational direction when the lockup clutch 9 is operated.

When the piston 11 of the lock-up clutch 9 is operated in the torque converter configured as described above, the driving force of the engine is transmitted to the first clutch drum 13 through the front cover 1.

Subsequently, the driving force of the engine is transmitted to the second clutch drum 15 through the first friction plate 17 and the second friction plate 19 in close contact with each other by the piston 11.

The driving force of the engine transmitted to the second clutch drum 15 is transmitted to the retaining plate 23. The driving force transmitted to the retaining plate 23 is transmitted to the driven plate 21 through the first and second torsion springs 25 and 27.

At this time, vibrations and shocks in the rotational direction are absorbed by the first and second torsion springs 25 and 27. In addition, since the first torsion spring 25 and the second torsion spring 27 are formed to have different spring constants, vibrations and shocks in different frequency ranges can be more efficiently absorbed.

The driving force transmitted to the driven plate 21 is transmitted to the spline hub through the turbine 5 and transmitted to the transmission through the input shaft of the transmission.

Meanwhile, although not shown in the drawings in describing an embodiment of the present invention, at least one of the driven plate 21 or the retaining plate 23 constituting the torsion damper 20 according to the embodiment May further include a pendulum damper or an anti-resonance damper.

In addition, the torsion damper 20 according to an embodiment of the present invention may independently constitute a damper system of a torque converter. On the other hand, the torsion damper 20 applied to the embodiment of the present invention may be connected in series or in parallel with another damper, such as a conventional spring damper or blade damper, depending on the embodiment, to constitute a damper system of a torque converter. .

Accordingly, when the torque converter for a vehicle according to the embodiment of the present invention is applied, the components of the torsion damper 20 are reduced to simplify the manufacturing process and reduce manufacturing cost.

In addition, in the present invention, by reducing the length of the torsion damper 20 in the axial direction compared to the prior art, design freedom can be improved by securing an internal space of the torque converter.

In addition, in the present invention, when the torsion damper 20 is operated, the first and second torsion springs 25 and 27 are separated from the driven plate 21 and the retaining plate 23, or dynamic friction By preventing this from occurring, the hysteresis torque can be reduced while increasing the durability of the first and second torsion springs 25 and 27.

Furthermore, the present invention can prevent the torsion torque of the torsion damper 20 from being reduced by reducing the hysterical torque of the first and second torsion springs 25 and 27 and increasing the durability, and It can increase the overall marketability of the converter.

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those of ordinary skill in the technical field to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equivalent range of the claims to be described.

1: front cover
3: impeller
5: turbine
7: Reactor
9: lock-up clutch
11: piston
13, 15: first and second clutch drums
17, 19: first and second friction plates
20: torsion damper
21: driven plate
21a: insertion part
21b: support groove
23: retaining plate
23a: insertion hole
23b: locking groove
23c: fixed hole
24a: opening
24b: locking part
25, 27: first and second torsion springs

Claims (10)

Front cover;
An impeller coupled to the front cover and rotating together;
A turbine disposed at a position facing the impeller;
A reactor positioned between the impeller and the turbine to change the flow of oil from the turbine toward the impeller;
A lock-up clutch having a piston directly connecting the front cover and the turbine; And
A torsion damper coupled to the lock-up clutch to absorb shock and vibration acting in a rotational direction; Including,
The torsion damper is
A driven plate connected to the output side;
A retaining plate coupled to the driven plate and connected to the lock-up clutch; And
A first torsion spring disposed between the driven plate and the retaining plate on the inner circumferential surface of the driven plate, one end fixed to the driven plate, the other end fixed to the retaining plate, and providing elastic force in the rotation direction ;
Vehicle torque converter comprising a. The method of claim 1,
Between the driven plate and the retaining plate
A second torsion spring is provided on the inner circumferential surface of the retaining plate from the opposite side of the turbine based on the axial direction, and one end is fixed to the retaining plate and the other end is fixed to the driven plate to provide elastic force in the rotational direction. Vehicle torque converter, characterized in that. The method of claim 2,
The driven plate is
A torque converter for a vehicle, comprising: a plurality of inserts integrally protruding toward the front cover based on an axial direction, formed at a position spaced apart by a set angle along a circumferential direction, and inserted into the retaining plate. . The method of claim 3,
Among the inserts, one of the inserts
A torque converter for a vehicle, characterized in that a fixing groove is formed in which the other end of the second torsion spring disposed on the front cover side is inserted with respect to the axial direction. The method of claim 3,
The retaining plate
An insertion hole formed at a position spaced apart by a set angle along the circumferential direction corresponding to the insertion portions;
A locking groove formed on one side of an outer circumferential surface corresponding to the other end of the first torsion spring and supported by being caught while the other end of the first torsion spring is inserted; And
A fixing hole formed between adjacent insertion holes among the insertion holes corresponding to one end of the second torsion spring, and fixed in a state in which one end of the second torsion spring is inserted;
Vehicle torque converter comprising a. The method of claim 5,
The locking groove is
An opening formed on the outer circumferential surface of the retaining plate to insert the other end of the first torsion spring; And
A locking portion spaced apart from the opening toward the center of the retaining plate at a set interval, connected to the opening at a position separated by a set angle along a circumferential direction, and supported by the other end of the first torsion spring;
Vehicle torque converter comprising a. The method of claim 1,
In the driven plate
A torque converter for a vehicle, characterized in that a support groove is formed on an outer circumferential surface so that one end of the first torsion spring is inserted and supported. The method of claim 2,
The first torsion spring
A torque converter for a vehicle, characterized in that it has a spring constant different from the second torsion spring. The method of claim 2,
The first and second torsion springs are
Each end formed toward the turbine and each other end formed toward the front cover are disposed at positions opposite to each other in a circumferential direction. The method of claim 1,
The lock-up clutch
A first clutch drum coupled to the front cover;
At least one first friction plate coupled to the first clutch drum and moving in an axial direction by the piston;
A second clutch drum coupled to the retaining plate; And
At least one second friction plate coupled to the second clutch drum and disposed between the first friction plate and the second clutch drum to move in an axial direction;
Vehicle torque converter comprising a.

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