JPS5911226Y2 - fluid transmission cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for a fluid transmission such as a torque converter or fluid coupling that inputs input to a pump impeller and outputs from a turbine runner.

For example, fluid transmissions used in industrial machines such as forklifts generate a relatively large amount of heat due to their operating conditions, so it is necessary to increase their cooling capacity.

However, as a cooling device for a conventional fluid transmission, Fig. 1~
There was something like the one shown in Figure 6.

In the figure, 1 is a torque converter case, 2 is a drive plate, 3 is a cover, 4 is a pump impeller, 5 is a turbine runner, 6 is a stator, 7 is a stator shaft, and 8 is a turbine shaft.

The ones shown in FIGS. 1 and 2 have radial fins 9 protruding from the outer wall of the pump impeller 4 made of aluminum, and those shown in FIGS. 3 and 4 have radial fins 9 protruding from the outer wall of the pump impeller 4 made of aluminum. A separate plate 10 is provided inside the torque converter case 1.

Further, in FIGS. 5 and 6, a shroud 11 having the shape shown in the figures is joined to the outer wall of a pump impeller 4 of a torque converter made of sheet metal by spot welding.

In all of the above conventional fluid transmissions, consideration has been given to cooling the pump impeller side, but no special consideration has been given to cooling the cover side.

However, as mentioned earlier, fluid transmissions used in industrial machinery such as forklifts generate a particularly large amount of heat, so
If cooling is performed only from the pump impeller side and not from the cover side, the hydraulic oil between the part of the cover and the turbine runner may experience an aeration phenomenon (the gas contained in the oil suddenly becomes bubbles). phenomenon) may occur.

Therefore, in such a fluid transmission, it is necessary to provide an appropriate cooling device also on the cover side.

The present invention has been developed from the above-mentioned viewpoint, and its primary purpose is to provide a cooling device for the cover side of a fluid transmission that has excellent cooling ability and can be applied to an aluminum fluid transmission.

Embodiments of the present invention will be described below with reference to FIGS. 7 and 8.

In the drawings, the same reference numerals as those described above indicate equivalent members.

Note that 12 is a fin that is radially distributed and protrudes from the outer wall of the pump impeller 4, 13 is a stepped boss for fixing the fin 12, and 14 is a stepped boss that fits into the tip of the stepped boss 13 and is caulked. This is a Stroud fixed to the pump impeller 4.

In the present invention, radial fins 15 are provided on the outer wall 3a of the cover 3 in a distributed manner, and the drive plate 2 is spaced apart from the cover 3 by a predetermined distance so as to cover these fins 15 and run along the cover 3. Place it so that it

Further, if the fins 15 are curved at a predetermined curvature to form a spiral shape as shown in FIG. 8, the cooling performance will be further improved.

In the figure, 16 is the engine crankshaft, 17 is a bolt for connecting the drive plate 2 to the crankshaft 16,
Reference numeral 18 indicates a bolt that connects the outer circumference of the drive plate 2 to the cover 2, and 2a indicates an air suction port provided at the inner circumference of the drive plate 2.

Since the device of the present invention is constructed as described above, the crankshaft 16
When the cover 3 of the fluid transmission rotates, the cover 3 of the fluid transmission also rotates via the drive plate 2.

However, in the present invention, seven radial fins 15 are distributed on the outer wall 3a of the cover 3, and the drive plate 2 is spaced apart from the cover 3 by a predetermined distance so as to cover these fins 15, and is placed along the cover 3. Since the cover 3, the drive plate 2, and the fins 15 located therebetween function as a pump impeller.

That is, from the air suction port 2a of the drive plate 2 to the seventh
As shown by the arrow in the figure, the air sucked into the outer wall 3a of the cover 3
The air flows toward the outer periphery along the arrow, and flows out from the air outlet 1a of the case 1 as shown by the arrow.

In this manner, according to the device of the present invention, the cover 3 is
can increase the airflow along the
Cooling performance on the cover side of the fluid transmission can be improved.

Note that when the fins 15 are curved into a spiral shape, the fins 15 have the effect of further increasing the air blowing ability.

Moreover, if the fins 15 are provided protrudingly on the cover 3, the heat dissipation area of the cover 3 is increased, so that the cooling performance is improved accordingly.

As described above, according to the device of the present invention, the fluid transmission can be cooled from the cover side as well, so it is possible to provide a fluid transmission that can sufficiently withstand even severe operating conditions.

In addition, since the present invention uses a drive plate to control the shroud, the structure can be kept simple, there is no increase in the number of parts, and there is an advantage that the assembly workability of the fluid transmission is not deteriorated in any way. .

Furthermore, although a portion of the cover is made of a plate-like member, in the device of the present invention, the cooling fins also function as reinforcing ribs, which has the effect of increasing the rigidity of the portion of the cover.

Also, from the opposite perspective, it has the effect of reducing the thickness of the cover member.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional torque converter, FIG. 2 is a front view showing the outer wall of the pump impeller, FIGS. 3 and 4 are longitudinal sectional views showing other structures of the conventional torque converter, and FIG. Fig. 5 is a longitudinal cross-sectional view showing a conventional sheet metal torque converter, Fig. 6 is a view taken along arrow A showing the shroud portion thereof, Fig. 7 is a longitudinal cross-sectional view of a torque converter equipped with the device of the present invention, and Fig. 8 is a partially cutaway front view of the drive plate. 2...Drive plate, 2a...Air suction port, 3...Cover, 3a...Outer wall thereof, 15...Fin, 16 ...Crankshaft, 17.18...Bolt.

Claims (1)

[Claims for Utility Model Registration] A pump impeller, a cover integrally connected to the pump impeller to form a closed space, and a turbine runner provided in the closed space to be driven by the pump impeller via fluid. a drive plate is juxtaposed adjacent to the outside of the cover far from the closed space, the center part of the drive plate is connected to the engine crankshaft, and the outer peripheral part is connected to the cover to drive the pump impeller. In a fluid transmission such as a fluid coupling or a torque converter in which the engine is driven through a plate, substantially radial fins protruding toward the drive plate are arranged on the cover in the circumferential direction, and the drive plate is connected to the outer periphery. A cooling device for a fluid transmission, characterized in that the drive plate is disposed along the cover so as to approach the cover as the drive plate approaches the cover, so that the drive plate covers the fin, and the drive plate is provided with an air suction port.