JPH0531312Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a torque converter with an improved front cover assembly.

(Prior Art and its Problems) Conventionally, as shown in FIG. 5, the torque converter 10 includes a front cover assembly 12 connected to the crankshaft (not shown) of the engine, and power is introduced from the front cover assembly 12. a turbine impeller 16 to which the power from the pump impeller 14 is transmitted via hydraulic oil inside the torque converter 10; and a turbine impeller 16 provided between the pump impeller 14 and the turbine impeller 16. It is formed from a stator impeller 18 and the like. Turbine impeller 16
is connected to a turbine shaft 19 that is connected to a subsequent planetary gear transmission (not shown). A thrust washer 20 is interposed between the turbine impeller 16 and the front cover assembly 12 to receive the thrust force generated by the flow of hydraulic oil within the torque converter 10.

In FIG. 6 showing a conventional front cover assembly 12, the front cover assembly 12 is formed by fixing a central front boss 21 and an annular front cover 22 at a welded portion 23. As shown in FIG. A guide 24 and a groove 25 are formed in a forged front boss 21, and the thrust washer 20 is in pressure contact with a pressure contact surface 26. 27 is bushiyu.

In the front cover assembly 12 shown in FIG. 6, the front boss 21 must be manufactured by expensive forging, leading to increased costs.

(Purpose of the invention) The object of the invention is to provide a torque converter whose front boss can be made of a low-cost sheet metal.

(Structure of the invention) (1) Technical means The invention consists of a pump that integrally has a front cover assembly in which an annular front cover is fixed to a front boss in the center, and a turbine that faces the pump and is connected to the turbine shaft. In a torque converter equipped with a stator provided between a pump and a turbine, a claw extending in the axial direction of the torque converter is integrally formed on the outer periphery of a front boss made of sheet metal, and this claw is attached to the inner periphery of the front cover. The front cover and front boss are fixed to each other by protruding from the hole into the torque converter with the inner peripheral surface of the tip of the claw to guide the thrust washer, and the thrust washer press contact surface is attached to a portion of the inner peripheral part of the front cover other than the hole. This is a torque converter characterized by forming radial grooves through which working fluid flows.

(2) Action The thrust washer is guided by the inner peripheral surface of the tip of the claw, and the working fluid flows through the groove of the front cover to form the front boss into a sheet metal.

(Example) In FIG. 1 showing the main parts of a torque converter employing the present invention, parts indicated by the same reference numerals as in FIG. 5 indicate the same or equivalent parts.

The front cover assembly 12 combines a front boss 30 made of sheet metal and a front cover 31 also made of sheet metal. The front boss 30 is formed into a substantially annular shape by press working or the like. The center line 1 of the turbine shaft 19 (Fig. 5) is located on the outer periphery of the front boss 30.
A claw 32 extends substantially parallel to 9a. Claw 3
2 are formed at four positions in the circumferential direction of the front boss 30 at equal intervals as shown in FIG. Furthermore, the cross-sectional shape of the claws 32 is approximately arcuate so that the claws 32 are arranged at four locations on a virtual circular orbit centered on the center line 19a.

As shown in FIG. 3, in the inner circumferential portion of the front cover 31, arc-shaped holes 33 through which the claws 32 are passed are opened at four locations equally spaced in the circumferential direction. Therefore, as shown in FIG. 1, the front boss 30 and the front cover 31 are assembled with the claw 32 passed through the hole 33 so that the tip of the claw 32 projects into the oil chamber 34 inside the torque converter 10. The front boss 30 and the front cover 31 are continuously welded over the entire circumference at a welding portion 35.

In FIG. 3, the pressure contact surface 40 on the inner circumference of the front cover 31, which the thrust washer 20 contacts, has radial grooves 4 at four locations equally spaced in the circumferential direction.
1 (FIG. 4) is formed by, for example, press working. The thrust washer 20 is a so-called plain type having an annular plate shape. This groove 41 is formed in a portion of the pressure contact surface 40 where the holes 33 are not open, that is, in an intermediate portion between adjacent holes 33.

Next, the action will be explained. In the embodiment shown in FIG. 1, the thrust washer 20 is guided by the inner peripheral surface of the claw 32 and presses against the pressure contact surface 40. The working fluid in the oil chamber 34 flows through the groove 41. Since the front boss 30 is made of sheet metal, the manufacturing cost is low.

(Effects of the invention) In the torque converter 10 of the invention, as shown in FIG. The thrust washer 20 is guided by the inner circumferential surface of the pawl 32 by extending into the oil chamber 34, and the groove 41 is formed on the pressure contact surface 40 of the front cover 31. Therefore, in the conventional example shown in FIG. 6, a high-cost forged product is used. Atatsuta Front Boss 21
Compared to using a front boss 30, a lower cost front boss 30 can be used, and the torque converter 10 can be made cheaper.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the main parts of a torque converter adopting the present invention, Figure 2 is a perspective view of the front boss,
3 is a view in the direction of the arrows in FIG. 1, FIG. 4 is a sectional view taken along the line -- in FIG. 3, FIG. 5 is a schematic structural diagram of the torque converter, and FIG. 6 is an enlarged view of section A in FIG. 10...
... Torque converter, 12 ... Front cover assembly, 30 ... Front boss, 31 ... Front cover, 32 ... Pawl, 33 ... Hole, 41 ... Groove.

Claims (1)

[Scope of utility model registration request] The pump includes a pump integrally having a front cover assembly with an annular front cover fixed to a front boss in the center, a turbine facing the pump and connected to a turbine shaft, and a stator provided between the pump and the turbine. In the torque converter,
A pawl extending in the axial direction of the torque converter is integrally formed on the outer periphery of the front boss made of sheet metal, and this pawl is inserted into the torque converter through a hole on the inner periphery of the front cover, and the thrust washer is guided by the inner peripheral surface of the tip of the pawl. The torque converter is characterized in that the front cover and the front boss are fixed to each other by protruding from the front cover, and radial grooves are formed in a portion of the inner circumference of the front cover other than the hole, through which working fluid flows through the thrust washer pressure contact surface. .