JPS5916558Y2 - Impeller for water pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impeller for a water pump having sufficient rigidity in a shaft fitting boss portion.

Most conventional press-molded automobile cooling water pump impellers have been caulked to metal bosses.

However, in such an impeller, most of the metal boss portion is machined, which requires a large amount of manufacturing man-hours.

Therefore, this cutting cost occupies a large proportion of the cost, and together with the material cost, it occupies a large part of the manufacturing cost, and it is also heavy.

The present invention was proposed in order to eliminate the above-mentioned conventional drawbacks, and includes a seal receiver, a boss that fits into the shaft,
An impeller extending radially outward is integrally molded with the boss part using a press, and a seal receiver part is provided at the connection part between the boss part and the impeller, and the seal receiver part is press-molded on the outer periphery of the boss part. The present invention aims to provide an impeller for a water pump that has sufficient rigidity by providing the seal receiver with a constricted portion having a diameter smaller than that of the seal receiver, and which is also less expensive and lighter than conventional ones. It is something to do.

In explaining the present invention with reference to the embodiments shown in the drawings, a conventional water pump impeller will be explained with reference to FIGS. 1 and 2 in order to make the structure of the present invention more clear.

First, in FIG. 1, reference numeral 1 denotes a pump casing, into which a bearing assembly and a shaft 2 are fitted.

3 is an end plate, 4 is a pulley bracket press-fitted into the shaft end 2a on the pulley side, and 5 is a gasket I, which is interposed between the end plate 3 and the pump casing 1.

6 is a mechanical seal unit, 7 is a seal ring on the rotating side of the seal unit 6, 8 is a buffer rubber interposed between the seal ring 7 and a metal boss 9, and the metal boss 9 is attached to the shaft end 2b on the shaft impeller side. It is fitted.

10 is an impeller caulked or press-fitted into the metal boss 9, 11 is a suction vortex chamber, and 12 is a discharge vortex chamber.

Now, in FIG. 1, the rotational force transmitted to the shaft 2 via the pulley bracket 4 is transmitted to the metal boss 9 press-fitted into the impeller side shaft end 2b, and further transmitted to the impeller 10 to perform a pumping action.

FIG. 2 shows a conventional impeller for a water pump with another structure, in which 13 is a casing, 14 is a bearing assembly and shaft provided in the casing 13, 15 is a seal ring on the rotating side of the mechanical seal unit unit, and 17 is a buffer. It's rubber.

18 is a pulley bracket fitted to the impeller side shaft end 14a, 19 is an impeller, and a ring 20 is attached to the impeller 19.
is fitted, and the ring 20 is attached to the impeller side shaft end 14.
It is press-fitted into b.

In FIG. 2, the rotational force transmitted to the shaft 14 via the pulley bracket 18 is transmitted to the impeller 19 press-fitted into the impeller side shaft end 14b to perform a pumping action.

However, in the conventional impellers shown in FIGS. 1 and 2, the metal boss portion and the impeller are caulked or press-fitted.

This required a certain size in the radial direction because a seal ring insertion part was required, and when press-fitting the impeller onto the shaft, the boss needed to be rigid in order to transmit rotational force to the impeller. The boss portion is manufactured by cutting out metal, which requires a large number of manufacturing steps as described above, which has the disadvantage of increasing costs.

FIG. 3 shows an impeller for a water pump according to an embodiment of the present invention, and FIG. 4 is a detailed view of the main parts in FIG. 3.

In the figure, 13 is a casing, and a bearing assembly and a shaft 14 are fitted into the casing.

15 is a mechanical seal unit, 16 is a seal ring on the rotating side of the seal unit, 17 is a buffer rubber, and 18 is a pulley bracket press-fitted into the shaft end 14a on the shaft pulley side.

Reference numeral 25 denotes an impeller that is integrally formed with a boss portion 26 and a seal receiver portion 27 by pressing. The seal receiver has a constricted portion 28 having a diameter smaller than that of the portion 27, which is made of pressed cedar bark.

In addition, as shown in FIG. 4, the impeller 25 and seal receiver
7 and the boss portion 26 are integrally molded using a press so as to be curved with a relatively large arc along the streamlines of the cooling water flowing in from the axial direction.

Now, in FIG. 3, the rotational force transmitted to the shaft via the pulley bracket 18 is transmitted to the impeller 25 press-fitted into the shaft impeller side shaft end 14b to perform a pumping action.

As explained in detail above, the present invention includes integrally molding the seal receiving part, the boss part that fits into the shaft, and the impeller extending radially outward with respect to the boss part, and Since the seal receiver portion is provided at the connection portion between the boss portion and the impeller, the number of parts can be reduced, and an inexpensive and lightweight press impeller can be obtained.

In addition, since a press-formed drawing part is provided on the outer periphery of the boss part, the boss part can be given sufficient rigidity, and there is no need to cut it out like in the past, so there is no need for many manufacturing man-hours. It has the following advantages.

In addition, since the diameter of the throttle part is smaller than that of the seal receiver, cooling water flows smoothly from the axial direction, improving pump efficiency, and suppressing cavitation, which is also effective in preventing rust. has.

[Brief explanation of drawings]

1 and 2 are side sectional views of a conventional water pump impeller, FIG. 3 is a side sectional view of a water pump impeller showing an embodiment of the present invention, and FIG. 4 is a side sectional view of a conventional water pump impeller. It is a detailed view. Explanation of the main parts of the figure, 14...shaft, 14 b.
...Shaft impeller side shaft end, 15... Mechanical seal unit, 25... Impeller, 26... Boss part, 27... Seal receiver part, 28... Throttle part.

Claims (1)

[Scope of utility model registration request] The seal receiver is formed by integrally molding a part, a boss part that fits into the shaft, and an impeller extending in the radial direction with respect to the boss part, and the seal receiver is attached to the connection part between the boss part and the impeller. 1. An impeller for a water pump, characterized in that a part is provided, and a constricted part having a diameter smaller than the diameter of the seal receiver is provided by press molding on the outer periphery of the boss part.