JPS5874823A - Engine cooling water pump drainage system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves opening one end of a casing of a water pump installed in a cooling water channel of an engine, and attaching a cover to the casing to close the opening with a plurality of bolts. The present invention relates to a drainage device for a water pump for cooling an engine of a motorcycle, etc., in which a pump chamber having a suction port and a discharge port is defined by a cover and a pump chamber.

When disassembling the engine or replacing the coolant,
The water in the pump chamber must be drained, but if a dedicated drainage mechanism was installed in the pump chamber to discharge the water, the number of parts and processing steps would increase, which would lead to an increase in costs. .

In view of the above, it is an object of the present invention to provide the above-mentioned drainage device with a simple structure, in which the lowest one of the plurality of bolt insertion holes provided in the cover is also used as a drainage hole.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a water-cooled V-type multi-cylinder engine E is mounted horizontally (its crankshaft 1
is mounted in a direction perpendicular to the longitudinal direction of the vehicle body frame F), and this engine E is mounted in a first engine block B1 that is inclined toward the front of the vehicle body frame F, and a second engine that is tilted toward the rear of the vehicle body frame F. Block B, and both engine blocks BItB! The power unit case 2 is connected to the lower part of the power unit case 2 and integrates the crankcase and the transmission case.

A generator 3 driven by the crankshaft 1 is disposed on one side of the power unit case 2, and a water pump 4 also driven by the crankshaft 1 is disposed behind it. The radiator 5 is supported. A suction pipe 8 and a discharge pipe 9 are connected to the suction port 6 and the discharge lower part of the water pump 4, respectively. The discharge pipe 9 extends forward, and its open end is connected to the outlet 10 of the radiator 5, and the discharge pipe 9 also wraps around the outer periphery of the lower surface of the generator 3, and its open end is connected to the outlet 10 of the radiator 5. It is connected to the inlet of a water jacket (not shown) of the second engine block B1eB2. The outlet of the water jacket is connected to the inlet 12 of the radiator 5 via a flexible hose 11.
connected to. As a result, a cooling channel is formed between the water pump 4, the engine E, and the radiator 5.

The water pump 4 includes a casing 13 with one end open and fitted into the power unit case 2, and a plurality of bolts 14, four in the illustrated example, attached to the casing 13. ~14.
The casing 13 and the cover 15 define a pump chamber R.

A drive shaft 16 that receives rotational force from the crankshaft 1 is rotatably supported in the casing 13, and an impeller 17 is fixed to the end of the drive shaft 16 that enters the pump chamber R. The suction port 6 is formed in the cover 15, and the discharge lower part is formed in the casing 13. Bolts 141 to 14 for attaching the cover 15 to the casing 13. Of these, the highest and lowest positions 14g-14t are used only for attaching the cover 15 to the casing 13, while the middle position 14. ．． 144 is used to penetrate the cover 15 and the casing 13 and attach them together to the power unit case 2.

Four bolt insertion holes are formed in the cover 15 to insert each bolt 14□ to 144, and in particular, the opening 19 of the bolt insertion hole 18 located at the lowest position on the casing 13 side is enlarged. A portion of the section 19 communicates with the pump chamber R. A sealing member 2o is interposed between the inner surface of the head of the bolt 14 and the opposing end surface of the opening of the bolt insertion hole 18.

In the above configuration, when discharging the water in the pump chamber R when disassembling carrots, etc., loosen the lowest bolt 14 and remove it (and - the cooling water in the pump chamber R is drained from the opening 19 through the bolt insertion hole 18). In this case, even if the cooling water in the pump chamber R is not completely discharged, there will be no problem in operation.

As described above, according to the present invention, among the plurality of bolt insertion holes provided in the cover for inserting the plurality of bolts, the one located at the lowest position is communicated with the pump chamber. It can be used as a drainage hole, and therefore a simple construction of the drainage device can be provided by only slightly changing the design of the existing cover.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of the present invention applied to a motorcycle, and FIG. 2 is a sectional view taken along the line ■--■ in FIG. 1. E...Engine, L...Cooling channel, R...Pump chamber, 4...Water pump, 6...Suction port, 7...Discharge port, 13...Casing, 14. ~144... Bolt, 15... Cover, 18... Port insertion hole. Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] One end of a casing of a water pump installed in a cooling waterway of an engine is opened, and a cover that closes the opening is attached to the casing with a plurality of bolts, and the casing and the cover form an inlet and an outlet. an engine having a pump chamber, wherein a lowermost one of a plurality of bolt insertion holes provided in the cover for inserting the plurality of bolts is communicated with the pump chamber; Drainage device for cooling water pump.