JPH0534361Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a lock-up damper for direct connection used in a torque converter of an automobile or the like.

(Prior art and its problems) Generally, this type of lock-up damper includes a piston plate 14 and a retaining plate 15 as piston components, as shown in FIG.
The driven plate 21 is simply connected to the torsion spring 38 using the piston plate structure as an elastic means.
is connected to. In such a damper,
Hysteresis torque during twisting is generated by friction only at the contact portion A between the torsion spring 38 and the retaining plate 15, as shown in FIG. That is, when the torsion spring 38 is compressed or expanded, the torsion spring 38 and the retaining plate 15 rub against each other.

However, it is difficult to generate stable and sufficient hysteresis torque only at the contact portion A between the torsion spring 38 and the retaining plate 15, and furthermore, it is difficult to control the hysteresis torque to a desired level. It is.

(Purpose of the invention) The purpose of the invention is to enable stable and sufficient hysteresis torque to be generated and to easily control the magnitude of the hysteresis torque.

(Technical Means for Achieving the Object) In order to achieve the above object, the present invention attaches a cylindrical damper case having both end walls to a piston plate structure in a posture along the circumferential direction of the piston plate structure. The damper case is fixed, and inside the damper case there are two sets of wedge outer cylinders that are divided into a plurality of circular arc shapes and can be expanded at a distance from each other in the axial direction of the case. It is wedge-shaped with an inclined surface, and the outer circumferential surface of the wedge outer cylinder is provided with a facing that contacts the inner circumferential surface of the damper case, and a conical wedge is attached to the inclined surface of each wedge outer cylinder on the center side in the axial direction of the case. A spring for generating a hysteresis load is installed between the two wedges, and a rod is provided that is movable in the axial direction of the case and passes through the case end wall, both wedge outer cylinders, and the wedge. A conical wedge portion is formed that contacts the remaining inclined surface of the cylinder, and both axial ends of the rod contact the driven plate.

(Function) When torsional vibration occurs during damper rotation, the piston plate component and the driven plate are twisted relative to each other, but the hysteresis load generation spring pushes them outward through the wedge and the wedge portion of the rod. Friction occurs between the facing of the wedge outer cylinder and the damper case, generating hysteresis torque.

(Embodiment) FIG. 5 shows a longitudinal cross-sectional view of an automobile torque converter equipped with the lock-up damper of the present invention. The wall 2 is connected to an input shaft (or engine flywheel) 5, and a peripheral wall 3
The tip of the pump impeller 7 is connected to the outer peripheral end of the pump impeller 7. A turbine impeller 8 facing the pump impeller 7 is integrally connected to an output shaft 10, and a stator impeller 9 having a one-way clutch 12 is arranged between the turbine impeller 8 and the pump impeller 7. There is.

The lock-up damper is integrally provided with a piston plate 14 and a retaining plate 15 as piston components, a driven plate 21 is integrally provided with a turbine impeller 8, and is disposed between the housing end wall 2 and the turbine impeller 8. ing. The inner circumferential end of the piston plate 14 is fitted into the outer circumference of a cylindrical portion 22 that is integral with the output shaft 10 so as to be freely movable in the axial direction. Housing end wall 2 of piston plate 14
An annular facing 16 facing the housing end wall 2 with a gap in between is integrally provided on the side surface. Oil chambers 30 and 31 are formed on both sides of the piston plate 14, respectively, and the oil chamber 30 on the turbine impeller side communicates with the hydraulic pump via, for example, the turbine chamber and a control valve. When the rotational speed ratio of the impeller 8 approaches approximately 1:1, the pressure in the oil chamber 30 is made higher than the pressure in the oil chamber 31, and both oil chambers 30, 31
The piston plate 14 is moved toward the end wall 2 by the pressure difference, and the facing 16 is brought into pressure contact with the end wall 2. The retaining plate 15 is formed in an annular shape and has a plurality of rivets 19.
is fixed to the surface of the piston plate 14 on the turbine impeller side.

In FIG. 4, which is an enlarged view of the portion shown in FIG. 5, an outer cylindrical portion 15d is formed at the outer peripheral end of the retaining plate 15, and a protrusion 15c that is bent inward in the radial direction is formed. .
An inner holding portion 15a and a projection portion 15b are formed in a portion separated radially inward from the outer cylindrical portion 15d. A driven plate 2 is provided between both protrusions 15b and 15c of the retaining plate 15.
1 is rushing in.

In FIG. 1 showing the - cross section of FIG. 4, between the outer projections 15c and 15c and the inner projection
Between b and 15b, a cylindrical damper case 23 is arranged along the circumferential direction of the piston plate structure.
is fixed, and end walls 23a are, for example, welded to both ends of the damper case 23. Inside the damper case 23, two sets of wedge outer cylinders 24 are arranged so as to be movable along the case axis and spaced apart from each other in the case axis direction. As shown in FIG. 3, the wedge outer cylinder 24 is divided into three arc-shaped parts and is configured to be expandable. A facing 25 that contacts the inner peripheral surface of the damper case 23 is provided on the outer peripheral end surface of the wedge outer cylinder 24. It is being The cross-sectional shape of the wedge outer cylinder 24 is formed into a wedge shape with inclined surfaces 26 and 27 on both sides in the axial direction of the case, as shown in FIG.

A conical wedge 32 having an axial hole is formed on the inclined surface 26 of each wedge outer cylinder 24 on the case axial center side.
A hysteresis load generating spring 29 is compressed with a predetermined load between both wedges 32 . A rod insertion hole 35 is formed in each end wall 23a of the damper case 23, respectively.

The rod 33 has both rod insertion holes 35 and both wedge outer cylinders 2.
4 and the wedge 32 so as to be freely movable in the axial direction of the case. Rod 33
A conical wedge portion 34 that abuts the axially outward inclined surface 27 of each wedge outer cylinder 24 is integrally formed in the case interior portion. The outer end of the case of the rod 33 is connected to the cutout edge 21 of the driven plate 21.
It is in contact with a. Further, the end portion of the damper case 23 on the side of the rotation center of the piston plate structure is held by an inner holding portion 15a of the retaining plate 15. The amount W of protrusion of the rod 33 to the outside of the case is set to be greater than the twist angle.

The operation will be explained. First, to briefly explain the operation of the entire torque converter, in FIG. 5, the rotational torque transmitted from the input shaft 5 to the housing 1 is transmitted from the pump impeller 7 to the turbine impeller 8 via the internal hydraulic oil. It is transmitted from the turbine impeller 8 to the output shaft 10. When the speed ratio of the turbine impeller 8 and the pump impeller 7 approaches 1:1, the pressure difference between the oil chambers 30 and 31 causes the piston plate 14 to move toward the end wall 2, and the facing 16 moves toward the end wall 2. press against. As a result, the end wall 2
Torque is directly transmitted from the turbine impeller 8 to the turbine impeller 8. This torque is applied to both projections 15b and 15 in FIG.
c to the damper case 23, to the driven plate 21 via the torsion spring 28 and the rod 33, and further from the turbine impeller 8 to the output shaft 10 in FIG.

During torque transmission in the above-mentioned direct connection, relative torsion occurs between the piston plate structure and the driven plate 21 due to rotational torque vibration. For example, when the piston plate structure is twisted in the direction of arrow B with respect to the driven plate 21, in other words, the driven plate 21 moves in the direction of arrow A relative to the retaining plate 15. In this case, the rod 33 in FIG. 1 is pushed by the driven plate edge 21a and the damper case 23
It moves in the direction of arrow A. This allows the second
As shown in the figure, the left torsion spring 28 is compressed, the torsion torque is buffered by the torsion spring 28, and torque vibrations are absorbed.

As mentioned above, when the rod 33 moves, both the wedge outer cylinders 24 also move together, but the wedge outer cylinder 24 is operated by the hysteresis load generating spring 29, so that the wedge part 34 and the wedge 3
Since the facing 25 is pressed against the inner peripheral surface of the damper case 23, hysteresis torque is generated due to the friction. Moreover, a substantially constant hysteresis torque is generated in accordance with the preset load of the hysteresis load generating spring 29 regardless of the magnitude of the rotational torque.

1 is set to be larger than the desired maximum torsion amount, a gap will be generated between the end wall 23a and the driven plate edge 21a during the second large torsion. Also, if the protrusion amount W is set to be the same as the desired maximum torsion amount, a gap will be generated between the right driven plate edge 21a and the right case end wall 22a when the desired maximum torsion amount is reached.
That is, the end wall 23a and the driven plate edge 21a function as a stopper.

By appropriately selecting the set load and spring strength of the hysteresis load generating spring 29 and the friction coefficient of the facing 25, the magnitude of the hysteresis torque can be controlled to a desired magnitude.

Figure 6 shows the torsional torque characteristics, where X ₁ is the characteristic when using a strong torsion spring and a relatively weak hysteresis load generating spring, for example.
X ₂ is the characteristic when a medium-strength torsion spring and a relatively strong hysteresis load generation spring are used, and X ₃ is the characteristic when a weak torsion spring and a relatively weak hysteresis load generation spring are used. In both cases, stable hysteresis torque is generated that is proportional to the strength of the hysteresis load generating spring.

(Another embodiment) (1) The torsion spring in the damper case 23 in Fig. 1 can be omitted, and a structure dedicated to generating hysteresis torque consisting of the damper case 23, the wedge outer cylinder 24, the wedge 32, the rod 33, and the hysteresis load generating spring 29 can be provided inside a damper equipped with a conventional torsion spring 38 as shown in Fig. 7. In this case, the torsion spring 38 functions as an elastic means for transmitting power.

(2) Also, as mentioned above, it consists of the conventional torsion spring 38 as shown in FIG. 7, the damper case 23, the wedge outer cylinder 24, the wedge 32, the rod 33, and the hysteresis load generating spring 29 as shown in FIG. When installing a structure dedicated to hysteresis torque generation, the torsion spring 38 and damper case 2
It is also possible to arrange the third class on the same circumference.

(Effects of the invention) As explained above, according to the invention: (1) The wedge 32 and the wedge portion 34 are connected to the inner peripheral surface of the damper case 23 and the hysteresis load generating spring 29.
Since the hysteresis torque is generated by the friction between the wedge outer cylinder 24 and the facing 25 which is pressed against the inner peripheral surface of the damper case via Compared to the structure that generates hysteresis load, the spring 2 for generating hysteresis load
By changing the load 9, etc., the hysteresis torque can be easily controlled to a stable desired magnitude.

(2) Inner peripheral surface of damper case 23 and wedge outer cylinder 24
Since hysteresis torque is generated due to friction with the facing 25 of the seventh
It is possible to generate a hysteresis torque larger than that of the conventional structure shown in the figure.

Therefore, it is possible to sufficiently correspond to various torque converters that require large hysteresis torque, and it is possible to generate appropriate hysteresis torque for each torque converter and effectively prevent noise and the like.

[Brief explanation of the drawing]

Figure 1 is an enlarged cross-sectional view of the main parts of a lock-up damper to which the present invention is applied (-cross-sectional view in Figure 4);
Fig. 2 is a sectional view of the same part as Fig. 1 showing the state during twisting, Fig. 3 is a - sectional view of Fig. 1, Fig. 4 is a - sectional view of Fig. 1, and Fig. 5 is a sectional view of the same part as Fig. 1. 6 is a torque characteristic diagram, FIG. 7 is a front partial view of a conventional example, and FIG. 8 is an enlarged partial sectional view of FIG. 7. 1...Housing, 5...Input shaft,
7...Pump impeller, 8...Turbine impeller, 1
0... Output shaft, 14, 15... Piston plate, retaining plate (piston plate structure), 21... Driven plate, 23... Damper case, 23a... End wall, 24... Wedge outer cylinder, 25 ... Facing, 29 ... Hysteresis load generation spring, 32 ... Wedge, 33 ... Rod, 34 ... Wedge portion.

Claims (1)

[Scope of utility model registration request] A torque converter lock comprising a piston plate structure that can be press-contacted to the input side housing and a driven plate fixed to the turbine impeller, and in which the piston plate structure and the driven plate are twistably connected via elastic means. In the up damper, a cylindrical damper case having both end walls is fixed to the piston plate structure in a posture along the circumferential direction of the piston plate structure,
Inside the damper case, two sets of wedge outer cylinders that are divided into a plurality of circular arc-shaped parts and can be expanded are arranged at intervals in the case axis direction, and the cross-sectional shape of the wedge outer cylinder is designed such that the cross-sectional shape has sloped surfaces on both sides in the case axis direction. The outer circumferential surface of the wedge outer cylinder is provided with a facing that contacts the inner circumferential surface of the damper case, and a conical wedge is in contact with the inclined surface of each wedge outer cylinder on the center side in the axial direction of the case. A spring for generating a hysteresis load is compressed between the wedges, and a rod that passes through the case end wall, both wedge outer cylinders, and the wedge is provided so as to be movable in the case axial direction, and the rest of the wedge outer cylinder is located inside the case of each rod. A lock-up damper for a torque converter, characterized in that a conical wedge portion is formed in contact with an inclined surface of the rod, and both axial ends of the rod are brought into contact with a driven plate.