JPH056176U - Outboard motor water pump - Google Patents

Abstract

(57) [Abstract] [Purpose] The object of the present invention is to reduce the mold cost and processing cost of the ceramic plate provided to reduce the wear inside the water pump case, and to simplify the manufacturing process. To provide a water pump for a simple outboard motor. [Constitution] In the water pump of the outboard motor according to the present invention,
An impeller 4 is rotatably provided in the water pump case 2, and ceramic plates 5 are provided on both upper and lower surfaces of the impeller 4, respectively. A side surface of the water pump case 2 located between the pair of ceramic plates 5 is provided. A water inlet 7 and a water outlet 8 are provided respectively.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a water pump for an outboard motor.

[0002]

[Prior Art]

 Generally, a water pump 51 for an outboard motor as shown in FIGS. 4 and 5 takes in water from a suction port 53 provided in a lower portion of a water pump case 52 and passes the taken-in water through an impeller 54 that rotates. The discharge port 55 is provided on the side surface of the water pump case 52.

In such a water pump case 52, a pair of upper and lower ceramic plates 56, 57 are provided on the upper and lower surfaces of the impeller 54 for the purpose of abrasion resistance, respectively, as shown in FIG. 56 and 57 prevent abrasion of the inner wall surface of the water pump case 52 on which the rotating impeller 54 slides. Then, the pair of upper and lower ceramic plates 56, 57 are formed in a disc shape as shown in FIGS. 7 and 8, and insertion holes 59, 60 for inserting the drive shaft 58 are formed at positions near the center, respectively. Has been done. Further, a circular arc-shaped long hole 61 is provided on the peripheral side of the lower ceramic plate 57 so as to correspond to the suction port 53 of the water pump case 52, and from the suction port 53 of the water pump case 52 through the long hole 61. It is designed to take in water from inside.

[0004]

[Problems to be solved by the device]

 However, in the water pump case 52 having the conventional shape, two types of ceramic plates 56 and 57 are required, and accordingly, two types of molding dies have to be produced, and the die cost is increased. It had the disadvantage of being bulky. Further, since ceramic is a very hard material, it is extremely difficult to form it. Especially, it is economically disadvantageous to form an arc-shaped long hole 61 as shown in FIG. 8 at a considerable processing cost. It was

The present invention has been made in view of the above circumstances, and an object thereof is to reduce the mold cost and the processing cost of a ceramic plate provided to reduce wear in the water pump case. An object of the present invention is to provide a water pump for an outboard motor that can simplify the manufacturing process.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems of the prior art, the present invention provides an outboard motor water pump in which an impeller is rotatably provided in a water pump case and ceramic plates are provided on the upper and lower surfaces of the impeller, respectively. A water inlet and a water outlet are provided on the side surfaces of the water pump case located between the pair of ceramic plates.

[0007]

[Work]

 In the outboard motor water pump according to the present invention, since the water inlet and outlet provided in the water pump case are not covered with the ceramic plate, the ceramic plate communicates with the inlet and outlet of the water pump case. It is not necessary to provide a communication hole, and it is possible to use one type of ceramic plate arranged above and below the impeller.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

1 to 3 show an embodiment of the present invention, in which 1 is a water pump of an outboard motor, and this water pump 1 is an upper part of a gear case for cooling an engine (not shown). It is provided in.

The water pump 1 includes a substantially cylindrical water pump case 2, and an impeller 4 rotatably driven by a drive shaft 3 is rotatably provided inside the water pump case 2. .. Disc-shaped ceramic plates 5 are disposed on the upper and lower surfaces of the impeller 4 for the purpose of abrasion resistance of the inner wall surface of the water pump case 2. An insertion hole 6 for inserting the drive shaft 3 is formed at a position near the center of these ceramic plates 5.

On the other hand, the water pump case 2 is provided with a suction port 7 for taking in water inside and a discharge port 8 for sending out water outside. Both the suction port 7 and the discharge port 8 are provided on the side surface of the water pump case 2 located between the pair of ceramic plates 5 and 5 arranged above and below the impeller 4, and the suction port 7 is The water pump case 2 is formed in a substantially L-shape that extends radially outward from the side surface of the water pump case 2 and extends downward in the middle. Further, the discharge port 8 is formed in a substantially L-shape that extends radially outward from the side surface of the water pump case 2 and extends upward in the middle. Then, the suction port 7 and the discharge port 8 are provided at positions substantially facing each other with the impeller 4 interposed therebetween.

In the water pump 1 configured as described above, the impeller 4 is rotated by the drive shaft 3 so that the cooling water is pumped from the passage provided below the water pump case 2. The pumped cooling water is sucked from the suction port 7 of the water pump case 2 and taken into the water pump case 2. Then, the taken-in cooling water is sent to the outside from the discharge port 8 through the rotating impeller 4, and is supplied to the cooling passage of the engine through a water tube (not shown).

In the water pump 1 of this embodiment, the cooling water suction port 7 and the cooling water discharge port 8 are provided on the side surface of the water pump case 2, so that the suction port 7 and the discharge port 8 and the ceramic plate 5 overlap each other. Since it is arranged so that it does not fit, it can be used if only the through hole 6 of the drive shaft 3 is drilled in the ceramic plate 5 that is extremely difficult to mold. In addition, the ceramic plugs arranged above and below the impeller 4 can be used. Rate 5 can be unified into one type of shape.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. It

[0015]

[Effect of the device]

 As described above, in the water pump for the outboard motor according to the present invention, the impeller is rotatably provided in the water pump case, and the ceramic plates are arranged on the upper and lower surfaces of the impeller, respectively. Since the water inlet and outlet of the water pump case are located on the side of the water pump case, the ceramic plate inside the water pump case can be unified into one shape. Only one type of mold is required, and the mold cost can be reduced compared to the conventional model, which is economically advantageous. Further, in the water pump of the present invention, since it is not necessary to provide the ceramic plate with the communication hole communicating with the suction port of the water pump case, the processing cost of the ceramic plate can be reduced and the manufacturing process can be simplified. Can be planned.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view showing a water pump of an outboard motor according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing the water pump.

FIG. 3 is a plan view showing a ceramic plate.

FIG. 4 is a horizontal cross-sectional view showing a water pump of a conventional outboard motor in a state in which a ceramic plate is not arranged.

FIG. 5 is a vertical cross-sectional view showing a conventional water pump for an outboard motor in the above state.

FIG. 6 is a vertical sectional view showing a water pump of a conventional outboard motor in a state where a ceramic plate is arranged.

FIG. 7 is a plan view showing a conventional ceramic plate arranged on the upper surface side of the impeller.

FIG. 8 is a plan view showing a conventional ceramic plate arranged on the lower surface side of the impeller.

[Explanation of symbols]

 1 Water Pump 2 Water Pump Case 3 Drive Shaft 4 Impeller 5 Ceramic Plate 6 Insertion Hole 7 Suction Port 8 Discharge Port

Claims (1)

Claims for utility model registration: 1. A water pump for an outboard motor, wherein an impeller is rotatably provided in a water pump case, and ceramic plates are provided on both upper and lower surfaces of the impeller. A water pump for an outboard motor, wherein a water inlet and a water outlet are respectively provided on the side surfaces of the water pump case located between the ceramic plates.