JPS6233409B2 - - Google Patents

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 is installed in the pump casing to drain the water, the number of parts and machining will increase. This increases the number of man-hours, which in turn leads to an increase in costs.

In view of the above, an object of the present invention is to provide the above-mentioned drainage device, which has a simple structure and allows the lowermost one of the plurality of bolt insertion holes provided in the cover to be used also as a drain hole.

In order to achieve this purpose, the present invention
One end of the casing of the water pump installed in the cooling water channel of the engine is opened, and a cover joined to the end face of the casing is removably fixed to the casing with a plurality of bolts to close the opening. A pump chamber having a suction port and a discharge port is defined by the casing and the cover, and the pump chamber houses an impeller that rotates together with a pump shaft that is substantially orthogonal to the joint surface of the cover with the casing. , the inner end of the lowest insertion hole among the plurality of bolt insertion holes provided in the cover for inserting the plurality of bolts is recessed only in the joint surface of the cover with the casing. The pump chamber is characterized in that it opens on the inner surface of the recess that directly communicates with the pump chamber.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. In Fig. 1, a water-cooled V-type multi-cylinder engine E is mounted horizontally on a body frame F of a motorcycle (its crankshaft 1 is parallel to the longitudinal direction of the body frame F). The engine E is mounted in a first engine block B ₁ that is tilted toward the front of the body frame F, a second engine block B ₂ that is tilted toward the rear of the body frame F, and both of them. It has a power unit case 2 which is connected to the lower part of the engine blocks B ₁ and B ₂ and which integrates a crank case and a 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. A radiator 5 is supported on the F down tube. A suction pipe 8 and a discharge pipe 9 are connected to the suction port 6 and discharge port 7 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. The discharge pipe 9 also wraps around the outer circumference of the lower surface of the generator 3, and its open end connects to the first and second engine blocks B ₁ and B _{2 .} is connected to the inlet of a water jacket (not shown). The outlet of the water jacket is connected to the inlet 12 of the radiator 5 via a flexible hose 11. As a result, a cooling water channel L is formed between the water pump 4, the engine E, and the radiator 5.

The water pump 4 has a casing 13 that is open at one end and is fitted into the power unit case 2.
and a cover 15 that is attached to the casing 13 by a plurality of bolts (four bolts 14 ₁ to 14 ₄ in the illustrated example) and closes the opening, and the casing 13 and the cover 15 define a pump chamber R. be done. A pump shaft 16 that receives rotational force from the crankshaft 1 is rotatably supported in the casing 13 . This pump shaft 16 is arranged to be substantially orthogonal to the joint surface 15a of the cover 15 with the casing 13, and an impeller 17 housed in the pump chamber R is fixed to the end of the shaft 16. There is. The suction port 6 is connected to the cover 15, and the discharge port 7 is connected to the cover 15.
are formed on the casing 13, respectively. Bolts 14 for attaching the cover 15 to the casing 13
Among ₁ to 14 ₄ , those 14 ₃ and 14 ₁ located at the highest and lowest positions are used only for attaching the cover 15 to the casing 13, while those 14 ₂ and 14 ₄ located in the middle are used for attaching the cover 15 and the casing. 13 and is used to attach them together to the power unit case 2.

Four bolt insertion holes are formed in the cover 15 to insert each bolt 14 ₁ to 14 ₄ , and in particular, the inner end of the bolt insertion hole 18 located at the lowest position is located at the joint surface of the cover 15 with the casing 13 . A recess 1 that is recessed only in 15a and directly communicates with the pump chamber 12
It opens at the bottom of the inner surface of 9. A sealing member 20 is interposed between the inner surface of the head of the bolt ₁₄₁ 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 during engine disassembly, etc., when the lowest bolt 14 ₁ is loosened and removed, the cooling water in the pump chamber R flows through the recess 19 and the bolt insertion hole 18. It is discharged to the outside. In this case, even if the cooling water in the pump chamber R is not completely discharged, there will be no problem in the work.

As described above, according to the present invention, one end of the casing of the water pump provided in the cooling water channel of the engine is opened, and the cover joined to the end surface of the casing to close the opening is secured by a plurality of bolts. The pump shaft is removably fixed to the casing, and the casing and the cover define a pump chamber having a suction port and a discharge port. The inner end of the lowest insertion hole among the plurality of bolt insertion holes provided in the cover for inserting the plurality of bolts is inserted into the casing of the cover. Since the recess is recessed only in the joint surface with the pump chamber and opens on the inner surface of the recess that communicates directly with the pump chamber, the lowermost bolt insertion hole can be used as a cooling water drain hole, and the bolt inserted therein can be used as a drain hole. Therefore, there is no need to specially provide a drain hole and a drain tank in the casing of the water pump, and the structure of the pump can be simplified, contributing to cost reduction and improved assemblability.

In particular, the recess formed in the cover for communicating the lowest bolt insertion hole with the pump chamber is recessed only in the joint surface of the cover with the casing, so it is easy to process. Since the recess is opened only in the direction along the pump axis with respect to the inner surface of the cover, there is no risk that the cooling water flowing in the circumferential direction around the outer circumferential side of the impeller will receive greater flow resistance than the recess. Even though the recess is specially provided on the inner surface of the cover, the pump efficiency does not decrease.

[Brief explanation of the drawing]

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 shown in FIG. 1. E...Engine, L...Cooling channel, R...Pump chamber, 4...Water pump, 6...Suction port, 7...Discharge port, 13...Casing, 14 ₁ to 14 ₄ ...
Bolt, 15...Cover, 15a...Joint surface, 1
8... Bolt insertion hole, 19... Recess.

Claims (1)

[Claims] 1. Open one end of the casing of a water pump installed in the cooling waterway of the engine, and attach a cover to the end surface of the casing to close the opening.
The casing is removably fixed to the casing with a plurality of bolts, and the casing and the cover define a pump chamber having a suction port and a discharge port. In a device that houses an impeller that rotates together with a pump shaft that is substantially perpendicular to the pump shaft, the inner end of the insertion hole located at the lowest position among the plurality of bolt insertion holes provided in the cover for inserting the plurality of bolts. . A drainage device for an engine cooling water pump, which is formed by opening into the inner surface of a recess that is recessed only in the joint surface of the cover with the casing and directly communicates with the pump chamber.