JPH0240331Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a spiral groove thrust bearing used in superchargers, compressors, blowers, turbines, pumps, etc.

[Conventional technology]

Conventional thrust bearings of this type are shown in Figures 5 and 6.
As shown in the figure, a plurality of spiral grooves 02 are provided from the outer circumference 04 toward the inner circumference 05, and the ends thereof are stopped at the outer circumference of the inner circumference land 03 for damming. Therefore, the pressure generating part is the spiral groove 02.
and land portions 01 are arranged alternately in the rotational direction. The flow generated along the groove is land part 0.
1, and finally the whole is dammed at the inner peripheral land 03, which has the function of bearing the load applied to the bearing with an oil film.

In addition, Fig. 3 is a simplified version of the shape of the thrust bearing shown in Fig. 5, and Ri is the bearing inner radius,
Rg indicates the end radius of the spiral groove, and Ro indicates the outer radius of the bearing.

Furthermore, FIG. 4 shows the sliding surface temperature (Tem) distribution of this conventional thrust bearing.

[Problem that the invention attempts to solve]

In the conventional device configured as described above, the temperature of the sliding surface becomes higher toward the inner side in the radial direction, as shown in FIG. As a result, the viscosity of fluid such as oil decreases, reducing load capacity, and the inner land surface in particular thermally expands, raising the position of the inner land surface, reducing the thickness of the oil film with the thrust collar and causing seizure. There were problems such as the occurrence of

[Means for solving problems]

The present invention was devised in view of the above-mentioned problems of the prior art, and is provided with a notch groove connected to the cooling fluid supply source at the back of the inner peripheral land.

[Effect]

By supplying low-temperature working fluid into the notched groove, the inner peripheral land portion is cooled.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

In the inward flow thrust bearing, a plurality of spiral grooves 2 are provided from the outer circumference 4 toward the inner circumference 5, and the ends thereof are stopped at the outer circumference of the inner circumferential land portion 3 for damming. Therefore, the pressure generating section is configured by spiral grooves 2 and land sections 1 arranged alternately in the rotational direction. The flow generated along the groove is dammed by the land part 1, and finally the whole is dammed by the inner land part 3, and the load applied to the bearing is borne by the oil film. 3, a notch groove 6 is provided on the back of the inner peripheral land portion,
The cutout groove 6 is connected to a cooling fluid supply source (not shown) via a fluid supply hole 7.

With this structure, the low-temperature working fluid flows into the notch groove 6 through the fluid supply hole 7, so that cooling of the inner peripheral land portion 3 is achieved, and all of the above-mentioned conventional problems are eliminated. However, stable bearing characteristics can be obtained.

[Effect of idea]

According to the present invention, in addition to reducing the temperature of the entire bearing, cooling of the inner peripheral land where the sliding surface temperature rises is the highest is achieved, there is no decrease in oil film thickness, and the inner peripheral land It is possible to achieve various excellent effects such as being able to prevent swelling due to thermal expansion and preventing damage such as seizure.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the main parts showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken from Fig. 1, and Fig. 3 is the radial dimensions of the inner circumference, outer circumference, and groove end position of a conventional spiral groove thrust bearing. Fig. 4 is an explanatory drawing showing the temperature distribution of the sliding surface in the radial direction of the conventional bearing, Fig. 5 is an explanatory drawing showing the structure of the conventional spiral groove thrust bearing, and Fig. 6 is an explanatory drawing showing the structure of the conventional spiral groove thrust bearing. - It is a cross-sectional view. 2...Spiral groove, 3...Inner peripheral land portion, 6...Notch groove, 7...Fluid supply hole.

Claims (1)

[Scope of utility model registration request] A spiral groove thrust bearing characterized in that a notch groove connected to a cooling fluid supply source is provided at the back of an inner peripheral land located inward from the terminal end of the spiral groove.