JPH023001Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a thrust washer fixing structure used in torque converters and the like.

(Prior art and its problems) A conventional three-element, one-stage, one-phase torque converter will be described with reference to FIG.

In FIG. 7, 10 is a cylinder shaft connected to the crankshaft, and a front cover 1 is attached to the rear end of the cylinder shaft 10.
2 is fixed by welding. Front cover 12
Behind the pump shell 1 of the pump impeller 14
5a are continuously fixed at a welded portion 15e.
The pump impeller 14 includes a pump shell 15a, a pump blade 15b, a pump core ring 15c, and a hub 15d, and is configured to transmit engine power to the pump blade 15b through the front cover 12 and the pump shell 15a.

A turbine impeller 16 is provided to face the pump impeller 14.
are the turbine shell 17a and the turbine blade 17
b, a turbine core ring 17c, and a hub 17d. The hub 17d is spline fitted to a turbine shaft (not shown). This turbine shaft connects to a subsequent transmission.

A stator impeller 20 is provided between the pump impeller 14 and the turbine impeller 16. The stator impeller 20 is formed from a stator boss portion 21a, stator blades 21b, and the like. A one-way clutch 23 is located inside the stator boss portion 21a.
An outer race 21c is provided, and a roller 21d is provided inside the outer race 21c.
An inner race 21e is provided. The inner race 21e is a stator shaft (not shown) that is fitted to the outer periphery of the turbine shaft with a predetermined gap therebetween.
A spline is fitted to the outer periphery of the The one-way clutch 23 is composed of the outer race 21c, roller 21d, inner race 21e, etc.

A thrust washer 22 made of, for example, phenolic resin is interposed between the hub 17d of the turbine impeller 16 and the front cover 12, and receives thrust force from the hub 17d. An oil groove 24 is formed in the thrust washer 22, and the thrust washer 22 is fixed with a lock plate 26. The lock plate 26 is fixed to the front cover 12 by spot welding, for example.

Thrust washer 22, lock plate 26
has a structure as shown in FIGS. 8 and 9. That is, the thrust washer 22 is formed with cross-shaped oil grooves 24, and the claws 28 of the lock plate 26 are fitted into the outer peripheral ends of the oil grooves 24 to fix the thrust washer 22. . The lock plate 26 is a generally annular press-molded product that covers the outer peripheral surface of the thrust washer 22.

However, in the conventional example described above, since the thrust washer 22 is made of phenolic resin with relatively low strength, the outer peripheral end of the oil groove 24 may be damaged.
Alternatively, play may occur between the oil groove 24 and the pawl 28 due to wear.

(Purpose of the invention) The object of the invention is to provide a fixing structure for a thrust washer for a torque converter, which can prevent the resin thrust washer from being damaged and the fixed part from becoming loose.

(Structure of the invention) (1) Technical means The present invention has a structure in which a resin thrust washer is fixed between the front cover of a torque converter and a turbine hub. Fixing of a thrust washer for a torque converter, characterized in that a lock plate is provided with a tapered surface whose cross-sectional area decreases as it approaches the front cover, and has a pressure contact part that comes into pressure contact with the tapered surface of the thrust washer, and is fixed to the front cover. It is a structure.

(2) Action The thrust washer is fixed by bringing the pressure contact part of the lock plate into pressure contact with the tapered surface of the thrust washer.

(Example) In FIG. 1 showing the main parts of the fixing structure of a thrust washer for a torque converter to which the present invention is applied, parts given the same reference numerals as in FIG. 7 indicate the same or equivalent parts.

In FIG. 1, 50 is a thrust washer made of, for example, phenolic resin. This thrust washer 50 has a substantially disc shape that fits into a recess 54 formed on the inner surface 52 of the front cover 12, and the side surface of the thrust washer 50 is a tapered surface 56. The tapered surface 56 is tapered, for example, so that it becomes thinner, that is, its cross-sectional area decreases as it approaches the hub 17d (FIG. 7) facing the front cover 12.
It is formed with a taper angle of approximately 45°. As shown in FIG. 2, the end face of the thrust washer 50 is provided with cross-shaped oil grooves 58 similar to the conventional oil grooves.

A substantially annular lock plate 60 is provided radially outward of the thrust washer 50 so as to cover the tapered surface 56 of the thrust washer 50, and the lock plate 60 is fixed to the inner surface 52 by, for example, spot welding. .

The lock plate 60 includes a ring portion 62 that is in close contact with the inner surface 52 and a pressure contact portion 64 that is in pressure contact with the tapered surface 56.
and are integrally formed, for example, by press working.
As shown in FIG. 3, the pressure contact portion 64 is formed substantially concentrically with the tapered surface 56 of the thrust washer 50 at substantially the same taper angle.
The axial height H of No. 4 is set so as not to block the oil groove 58. Therefore, the flow of hydraulic oil from the oil groove 58 is not obstructed. Also, when the gap D in FIG.
The thrust washer 50 is fixed to the front cover 12 by pressure contact over the entire circumference.

Next, the effect will be explained. Ring portion 62 and inner surface 52
When fixed in close contact, the pressure contact portion 64 is in pressure contact with the tapered surface 56 of the thrust washer 50, so the thrust washer 50 is fixed in the recess 54 of the front cover 12 by this pressure contact force. Further, the pressure contact force by this pressure contact portion 64 is applied to the tapered surface 5
6, there is no risk of damage to the tapered surface 56.

Furthermore, since the pressure contact portion 64 and the tapered surface 56 are formed approximately concentrically, the pressure contact portion 64 is connected to the tapered surface 56.
Centering can be accomplished simply by spot welding the ring portion 62 to the inner surface 52 while the ring portion 62 is in pressure contact with the inner surface 52, making the fixing work easier.

(Effects of the invention) As explained above, the fixing structure of the thrust washer for a torque converter according to the invention fixes the resin thrust washer interposed between the front cover of the torque converter and the turbine hub part. In the structure, the thrust washer is provided with a tapered surface whose cross-sectional area decreases as it approaches the turbine hub, and a lock plate having a pressure contact portion that presses against the tapered surface of the thrust washer is fixed to the front cover. be effective.

First, when fixing the ring part 62 and the inner surface 52 in close contact, the pressure contact part 64 is attached to the thrust washer 5.
The thrust washer 50 can be brought into pressure contact with the tapered surface 56 of 0, and the thrust washer 50 can be fixed to the recess 54 of the front cover 12 by this pressure contact force.

Further, since the pressure contact force by the pressure contact portion 64 acts substantially uniformly over the entire circumference of the tapered surface 56, damage to the tapered surface 56 can also be prevented.

Furthermore, when the pressure contact portion 64 and the tapered surface 56 are formed substantially concentrically, the pressure contact portion 64 and the tapered surface 56 are formed substantially concentrically.
Center alignment can be performed simply by spot welding the ring portion 62 to the inner surface 52 while the ring portion 62 is in pressure contact with the inner surface 52, making the fixing work easier.

(Another embodiment) (1) As shown in FIG. 4, recesses 70 are formed at multiple locations in the circumferential direction of the tapered surface 56, and the detent projections 72 that fit into the recesses 70 are connected to the press-contact portion 64.
Alternatively, the thrust washer 50 may be prevented from rotating by fitting the recess 70 and the anti-rotation protrusion 72 .

(2) Furthermore, as shown in FIGS. 5 and 6, tapered surfaces 74 are formed at multiple locations in the circumferential direction of the thrust washer 50, and pressure contact portions 76 that are in pressure contact with the tapered surfaces 74 are formed on the lock plate 60. may be formed.

(3) The present invention is of course applicable not only to the above three-element, one-stage, one-phase type torque converter, but also to other torque converters, such as a four-element, two-stage, two-phase type.
It can also be applied to fluid couplings that correspond to torque converters. Therefore, in this specification, the term "torque converter" is used to include fluid coupling.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical sectional view showing the fixing structure of a thrust washer for a torque converter to which the present invention is applied, Fig. 2 is a view taken in the direction of the arrow in Fig. 1, Fig. 3 is an enlarged view of a portion of Fig. 1, FIG. 4 is a vertical cross-sectional view of main parts showing another embodiment, FIG. 5 is a rear view showing still another embodiment,
6 is a sectional view of FIG. 5, FIG. 7 is a vertical sectional view showing a conventional torque converter, and FIG. 8 is a sectional view of FIG.
FIG. 9 is an enlarged longitudinal cross-sectional view of the main part of the figure, and FIG. 9 is a view taken along the arrow in FIG. 12...Front cover, 17d...Hub, 50...
Thrust washer, 56...Tapered surface, 58...
Oil groove, 60...lock plate, 62...ring part,
64... Pressure contact part.

Claims (1)

[Claims for Utility Model Registration] (1) In a structure for fixing a resin thrust washer interposed between the front cover of a torque converter and a turbine hub, the thrust washer has A fixing structure for a thrust washer for a torque converter, characterized in that a lock plate is provided with a tapered surface having a reduced cross-sectional area and has a press-contact portion that comes into pressure contact with the tapered surface of the thrust washer, and is fixed to the front cover. (2) A recess is formed in a part of the tapered surface of the thrust washer, and a detent protrusion that engages with the recess is formed in the pressure contact part of the lock plate. Fixed structure of thrust washer for torque converter.