JP3121242B2 - Water pump structure of internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump structure for an internal combustion engine, and more particularly to a water pump structure for an internal combustion engine of a pre-cooling type.

[0002]

2. Description of the Related Art In an internal combustion engine of the pre-intake cooling type, as disclosed in Japanese Utility Model Laid-Open No. 2-63052, a cooling water passage of a cylinder head is divided into an intake side and an exhaust side, and an outlet of a radiator is provided. Connect the cooling water passage on the intake side of the cylinder head, connect the outlet to the suction port of the water pump, connect the discharge port of the water pump to the inlet of the cooling water passage of the cylinder block, and connect the cooling water passage of the cylinder block to the cylinder. The head communicates with a cooling water passage on the exhaust side of the head, and its outlet is connected to the inlet of the radiator.

As a structure of the water pump, for example, a structure as shown in FIG. 5 is known. In FIG. 5, one end of the cylinder head 31 is made to protrude beyond one end of the cylinder block 32, and an outlet 35 of the intake-side cooling water passage 34 is opened downward at the protruding portion 33. 38
A pump casing 36 having an impeller unit 37 rotatably supporting the pump casing 36 is attached.
3 is connected to the lower end surface of the pump casing 36 via a seal member 39, and the upper end opening of the introduction passage 40 formed in the pump casing 36 is connected to the outlet 35 of the intake-side cooling water passage 34.

[0006] As shown in FIG. 6, the pump casing 36 shown in FIG. 5 is divided into a small pump casing 41 having an impeller unit 37 and a casing frame 42 on the outer periphery thereof, and introduced into the casing frame 42. A structure in which a passage 40 is formed and attached to one end surface of a cylinder block 32 to connect the introduction passage 40 and the outlet 35, and a pump casing 41 is detachably attached to the casing frame 42. Is also known.

[0005]

However, in the water pump structure as shown in FIG. 5, the pump casing 36 is connected to the cylinder block 32 for maintenance such as replacement of mechanical seals and bearings in the impeller unit 37 of the water pump. Of the seal member 39 between the upper end surface 36a of the pump casing 36 and the lower end surface of the protruding portion 33 of the cylinder head 31 when re-assembling, it is difficult to obtain a sufficient amount of compression of the seal material 39, and a defective seal occurs. There is a problem that it takes a lot of trouble to assemble so as not to cause a defective seal, and the workability is poor.

On the other hand, in the water pump structure as shown in FIG. 6, since the pump casing 41 can be attached to and detached from the casing frame 42, such a problem is solved. There is a problem that the cost is greatly increased because the number of parts is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a water pump structure of an internal combustion engine that can be maintained with good workability and that can be configured simply and at low cost.

[0008]

SUMMARY OF THE INVENTION According to the present invention, an outlet of a cooling water passage of a cylinder head is opened downward on one side outside one end of a cylinder head in a crankshaft direction, and one end of a cylinder block in a crankshaft direction is opened. On one side outside, an introduction passage connected to the cooling water passage outlet of the cylinder head and a pump casing opened at one end of the cylinder block are integrally formed, and a suction port and a cylinder block communicating with the pump casing at the lower end of the introduction passage are formed. A discharge port communicating with the cooling water passage is provided, and a cover case having an impeller unit is joined to the opening of the pump casing, or the cylinder head is cooled on one side outside one end of the cylinder head and the cylinder block as described above. Instead of arranging the outlet of the water passage and the introduction passage, one end of the cooling water passage of the cylinder head in the crankshaft direction is used. An opening is downwardly opened in the portion, and a pair of partition members are attached to one side of one end of the cooling water passage of the cylinder block in the crankshaft direction to form an introduction passage connected to the cooling water passage outlet of the cylinder head. As described above, the pump casing is formed integrally with the cylinder block, and by attaching and detaching a cover case provided with the impeller unit, maintenance can be performed with good workability.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIGS. 1 and 2, reference numeral 1 denotes a cylinder block, and 2 denotes a cylinder head. At one end of the cylinder block 1 in the crankshaft direction, a pump casing 3 is positioned outward from an upper end of one side surface by a suitable distance. It is formed integrally by projecting.

The pump casing 3 has a front opening 4 at one end 1a of the cylinder block 1, a suction port 5 at the back, and an introduction passage 6 extending upward from the suction port 5. ing. The introduction passage 6 is also formed so as to protrude outside one side surface of the cylinder block 1, and its upper end is opened at the upper end surface 1 b of the cylinder block 1, and is connected to the outlet 12 of the cooling water passage 11 on the intake side of the cylinder head 2. It is the mouth 7.

Reference numeral 7a denotes a reinforcing rib formed so as to connect across the intermediate portion of the connection port 7.

Reference numeral 9 denotes a discharge port opened at the end of a discharge passage 8 spirally extending from the center of the pump casing 3 so as to communicate with the cooling water passage 10 of the cylinder block 1. As shown by phantom lines in FIGS. 2 (b) and 2 (c), the cylinder head 2 is provided with a protruding portion 13 at one end outside in the direction of the crankshaft. Outlet 12 is opened downward.

Reference numeral 14 denotes a front opening 4 of the pump casing 3.
The cover case is detachably joined to the cover case and closes the front opening 4. A seal member 14b is disposed on a joint surface 14a on the outer peripheral portion. At the center of the cover case 14, a bearing cylinder 15 projects outwardly, and an impeller shaft 17 is rotatably supported via a bearing 16. An impeller 18 is fixed to one end of the impeller shaft 17 inside the pump casing 3, and a driving pulley 19 is fixed to the other end outside the pump casing 3. Reference numeral 20 denotes an inner circumference of an end of the bearing cylinder 15 on the pump casing 3 side and the impeller shaft 1.
7 is a mechanical seal interposed therebetween. These bearings 16, impeller shaft 17, impeller 18, pulley 19
The mechanical seal 20 forms an impeller unit 21.

In the above configuration, when the pulley 19 rotates in conjunction with the rotation of the crankshaft, the impeller 18 rotates, and the cooling water in the cooling water passage 11 on the intake side of the cylinder head 2 has its outlet 12 and inlet passage 6. Then, the air is sucked from the suction port 5 through the discharge port 8 and discharged through the discharge path 8 and the discharge port 9 toward the cooling water path 10 of the cylinder block 1. The cooling water passing through the cooling water passage 10 of the cylinder block 1 flows out to the radiator through the cooling water passage on the exhaust side of the cylinder head 2, and flows from the radiator into the inlet of the cooling water passage 11 on the intake side of the cylinder head 2. Circulate.

The bearing 16 and the mechanical seal 2
When the maintenance of the impeller 18 and the like is performed, the impeller unit 21 can be taken out by removing the cover case 14. When reassembling after the maintenance is completed, the cover case 14 is simply joined to the front opening 4 of the pump casing 3 and the joining surface 14a is formed.
Can be compressed to secure the seal.

Next, another embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, description thereof will be omitted, and only different points will be described.

3 and 4, in the above embodiment,
On the outer side of one end of the cylinder block 1 and the cylinder head 2, a protruding portion 13 having an inlet passage 6 and an outlet 12 of a cooling water passage 11 of the cylinder head 2 is provided. An outlet 22 is opened downward at one side of one end of the cooling water passage 11 in the crankshaft direction, and a pair of partitions are provided at an appropriate interval at one side of one end of the cooling water passage 10 of the cylinder block 1 in the crankshaft direction. The members 23a and 23b are mounted to define an introduction passage 24 connected to the outlet 22 of the cooling water passage 11 of the cylinder head 2, and the suction port 5 at the back of the pump casing 3 is opened on the wall surface on the cylinder block 1 side. The communication port 25 communicates with the lower end of the introduction passage 24 through the communication port 25.

It is apparent that this embodiment also provides the same operation as the above embodiment, and according to this embodiment, the cylinder block 1 and the cylinder head 2
The pump casing 3 only protrudes outward on one side of the one end portion, so that the cylinder block 1 and the cylinder head 2 can be made compact and the casting mold thereof can be simplified and inexpensively formed.

[0020]

According to the water pump structure for an internal combustion engine of the present invention, the outlet of the cooling water passage of the cylinder head is opened downward on one side outside the one end in the crankshaft direction of the cylinder head, and the crank of the cylinder block is opened. An introduction passage connected to the cooling water passage outlet of the cylinder head and a pump casing opened at one end surface of the cylinder block are integrally formed on one side outside the one end portion in the axial direction, and the suction connected to the pump casing at a lower end of the introduction passage. A port and a discharge port communicating with the cooling water passage of the cylinder block are provided, and a cover case having an impeller unit is joined to an opening of the pump casing, or the cylinder head and the cylinder head are provided on one side outside one end of the cylinder block. Instead of arranging the outlet of the cooling water passage and the introduction passage, the cooling water passage of the cylinder head An outlet is opened downward on one side of the end portion, and a pair of partition members are mounted on one side of one end in the crankshaft direction of the cooling water passage of the cylinder block and connected to the cooling water passage outlet of the cylinder head. The passage is defined and the pump casing is formed integrally with the cylinder block, and the cover case with the impeller unit is attached to and detached from it, so that the cover case is removed when performing maintenance on the impeller unit. Thereby, maintenance can be performed with good workability, the reassembly can be easily performed, the configuration is simple, and the configuration can be achieved at low cost.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional plan view of a water pump structure according to an embodiment of the present invention.

FIGS. 2A and 2B show a pump casing and an introduction passage formed integrally with a cylinder block in the same embodiment, wherein FIG. 2A is a partial cross-sectional plan view, FIG. 2B is a front view, and FIG.

FIG. 3 is a perspective view of a water pump structure according to another embodiment of the present invention.

FIG. 4 is a cross-sectional plan view of a main part of the embodiment.

FIG. 5 is a longitudinal sectional view of a conventional water pump structure.

FIG. 6 is a longitudinal sectional view of another conventional water pump structure.

[Explanation of symbols]

 Reference Signs List 1 cylinder block 2 cylinder head 3 pump casing 4 front opening 5 suction port 6 introduction passage 9 discharge port 10 cooling water passage of cylinder block 1 11 cooling water passage of cylinder head 2 12 outlet 14 cover case 21 impeller unit 22 outlet 23a partition member 23b partition member 24 introduction passage

Claims (2)

(57) [Claims] An outlet of a cooling water passage of a cylinder head is downwardly opened outside one end of a cylinder head in a crankshaft direction, and an outlet of a cylinder head is opened outside one end of a cylinder block in a crankshaft direction. An inlet passage connected to the outlet of the cooling water passage and a pump casing opening at one end of the cylinder block are integrally formed, and a suction port communicating with the lower end of the introduction passage to the pump casing and a discharge port communicating with the cooling water passage of the cylinder block. And a cover case provided with an impeller unit is joined to an opening of the pump casing. 2. A cooling water passage of the cylinder head has an outlet opening downward at one side of one end in the crankshaft direction, and a pair of partition members at one side of one end of the cooling water passage of the cylinder block in the crankshaft direction. A pump casing that opens at one end surface of the cylinder block is formed integrally on one side outside of one end of the cylinder block, and is introduced into the pump casing. A water pump structure for an internal combustion engine, comprising: a suction port communicating with a lower end of a passage; and a discharge port communicating with a cooling water passage of a cylinder block, and a cover case having an impeller unit is joined to an opening of a pump casing. .