JPH0988590A - Water pump structure of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform maintenance with high workability and besides to perform constitution simply at a low cost. SOLUTION: The outlet of the cooling water passage of a cylinder head is opened in a down state in one end part in the axial direction of the crankshaft of the cylinder head. An introduction passage 6 connected to the outlet of the cooling passage of the cylinder head and a pump casing 3 opened at one end face of the cylinder block 1 are integrally formed on one side of one end part in the direction of a crankshaft of a cylinder block 1. The suction port 5 of a pump casing 3 is communicated with the lower end of an introduction passage 6 and the discharge port thereof with the cooling water passage 10 of a cylinder block 1. A cover case 14 having an impeller unit 21 is removable from the pump casing 3 formed integrally with the cylinder block 1.

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 intake precooling internal combustion engine.

[0002]

2. Description of the Related Art In an intake-air pre-cooling type internal combustion engine, 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 to the intake side cooling water passage of the cylinder head, connect its outlet to the intake 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. It communicates with the exhaust side cooling water passage 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 configured as shown in FIG. 5 is known. In FIG. 5, one end of the cylinder head 31 is projected beyond one end of the cylinder block 32, and the outlet 35 of the intake-side cooling water passage 34 is opened downward in the projection 33, and the impeller is attached to one end surface of the cylinder block 32. 38
A pump casing 36 having an impeller unit 37 that rotatably supports is attached, and the upper end surface 36 a of the pump casing 36 is attached to the protrusion 3 of the cylinder head 31.
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.

Further, 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 peripheral portion thereof, and the casing is introduced into the casing frame 42. A structure in which the introduction passage 40 and the outlet 35 are connected by forming the passage 40 and attaching it to one end surface of the cylinder block 32, and the 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 attached to the cylinder block 32 for maintenance such as mechanical seal and bearing replacement in the impeller unit 37 of the water pump. When it is reassembled, it is difficult to obtain a sufficient compression margin of the sealing material 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, resulting in poor sealing. There is a risk that it takes a lot of time and effort to assemble it so as not to cause a defective seal, and there is a problem that workability is poor.

On the other hand, in the water pump structure as shown in FIG. 6, since the pump casing 41 is attachable to and detachable from the casing frame 42, such a problem is solved, but the number of parts is increased and the machining is increased. Since the number of parts is increased, there is a problem that the cost is significantly increased.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a water pump structure for an internal combustion engine which can be maintained with good workability and which can be constructed easily 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 at one side of one end of a cylinder head in the crankshaft direction, and one end of the cylinder block in the crankshaft direction is opened. On one outer side of the cylinder head, an inlet passage connected to the outlet of the cooling water passage of the cylinder head and a pump casing opening at one end surface of the cylinder block are integrally formed, and the pump casing is connected to a suction port communicating with the lower end of the inlet passage and the cylinder block. A discharge case communicating with the cooling water passage is provided, and a cover case equipped with an impeller unit is joined to the opening of the pump casing, or as described above, the cylinder head is cooled to one outside of one end of the cylinder head and the cylinder block. Instead of arranging the outlet or the introduction passage of the water passage, one end of the cooling water passage of the cylinder head in the crankshaft direction is arranged. Section, an outlet is opened downward, and a pair of partitioning members are attached to one side of one end of the cooling water passage of the cylinder block in the crankshaft direction to define an introduction passage connected to the cooling water passage outlet of the cylinder head. Thus, the pump casing is formed integrally with the cylinder block in this manner, and a cover case equipped with an impeller unit is attached to and detached from the cylinder casing so that maintenance can be performed with good workability.

[0009]

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

In FIGS. 1 and 2, 1 is a cylinder block, 2 is a cylinder head, and at one end of the cylinder block 1 in the crank axis direction, a pump casing 3 is located outside at a proper distance from the upper end of one side surface thereof. It is projected and formed integrally.

In this pump casing 3, a front opening 4 is opened at one end surface 1a of the cylinder block 1, a suction port 5 is provided on the back side, and an introduction passage 6 extends upward from the suction port 5. ing. The introduction passage 6 is also formed so as to project to the outside of one side surface of the cylinder block 1, and its upper end opens at the upper end surface 1b 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 said to be mouth 7.

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

Reference numeral 9 denotes a discharge port that is opened at the tip of a discharge passage 8 that extends spirally from the central portion of the pump casing 3 so as to communicate with the cooling water passage 10 of the cylinder block 1. As shown in phantom lines in FIGS. 2B and 2C, the cylinder head 2 is provided with a projecting portion 13 protruding outward on one side at one end in the crankshaft direction, and the cooling water passage 11 of the cylinder head 2 is provided. The outlet 12 is open downward.

Reference numeral 14 denotes a front opening 4 of the pump casing 3.
It is a cover case that is detachably joined to and closes the front opening 4, and a sealing material 14b is arranged on a joining surface 14a of the outer peripheral portion thereof. A bearing tubular portion 15 is provided at a central portion of the cover case 14 so as to project outward, 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 portion of the bearing tubular portion 15 on the pump casing 3 side and the impeller shaft 1.
7 is a mechanical seal that is interposed between the mechanical seal and the seal 7. These bearing 16, impeller shaft 17, impeller 18, pulley 19
The mechanical seal 20 constitutes an impeller unit 21.

In the above construction, 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 introduction passage 6. Through the discharge port 8 and the discharge port 9 to flow out toward the cooling water passage 10 of the cylinder block 1. The cooling water that has passed 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 to the inlet of the cooling water passage 11 on the intake side of the cylinder head 2. Circulate.

Then, the bearing 16 and the mechanical seal 2
For maintenance of the impeller 18 and the like, 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 joint surface 14a is formed.
The sealing material 14b can be compressed and a seal can be secured.

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

3 and 4, in the above embodiment,
A protrusion 13 having an inlet 12 and an outlet 12 of a cooling water passage 11 of the cylinder head 2 is provided on one outer side of one end of each of the cylinder block 1 and the cylinder head 2. The cylinder head 2 is provided in this embodiment. The outlet 22 is opened downward on one side of one end of the cooling water passage 11 in the crankshaft direction, and a pair of partitions are formed on one side of the one end of the cooling water passage 10 of the cylinder block 1 in the crankshaft direction with a proper interval. An inlet passage 24 connected to the outlet 22 of the cooling water passage 11 of the cylinder head 2 is partitioned and formed by mounting the members 23a and 23b, 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. It is communicated with the lower end of the introduction passage 24 through the communication port 25.

It is clear that this embodiment also has the same effect as that of the above-mentioned embodiment, and according to this embodiment, the cylinder block 1 and the cylinder head 2 are also provided.
Since the pump casing 3 only projects to the outside on one side of one end of the cylinder block 1, the cylinder block 1 and the cylinder head 2 can be made compact, and the casting mold thereof can be made simple and inexpensive.

[0020]

According to the structure of the water pump for the internal combustion engine of the present invention, the outlet of the cooling water passage of the cylinder head is opened downward at one outer side of one end of the cylinder head in the crank axis direction, and the crank of the cylinder block is cranked. An intake passage that connects to the outlet of the cooling water passage of the cylinder head and a pump casing that opens at one end surface of the cylinder block are integrally formed outside one end of the axial direction, and the suction that communicates with the lower end of the introduction passage in the pump casing. A discharge port communicating with the cooling water passage of the cylinder block, a cover case equipped with an impeller unit is joined to the opening of the pump casing, or the cylinder head and the cylinder head are attached to the outside of one end of the cylinder block. Instead of arranging the outlet or the introduction passage of the cooling water passage, the direction of the crank axis of the cooling water passage of the cylinder head An outlet that opens downward on one side of the end, and a pair of partitioning members is attached to one side of one end of the cooling water passage of the cylinder block in the crankshaft direction to connect to the cooling water passage outlet of the cylinder head. The passage is divided into sections, the pump casing is formed integrally with the cylinder block, and the cover case equipped with the impeller unit is attached to and detached from this, so remove the cover case when performing maintenance on the impeller unit. As a result, it is possible to perform maintenance with good workability, easily reassemble, and to have a simple structure, which is advantageous in that the structure can be inexpensive.

[Brief description of drawings]

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

FIG. 2 shows a pump casing and an introduction passage integrally formed with a cylinder block in the same embodiment, (a) is a partial sectional plan view, (b) is a front view, and (c) is a side view.

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 same embodiment.

FIG. 5 is a vertical cross-sectional view of a conventional water pump structure.

FIG. 6 is a vertical cross-sectional view of another conventional water pump structure.

[Explanation of symbols]

 1 Cylinder Block 2 Cylinder Head 3 Pump Casing 4 Front Opening 5 Suction Port 6 Inlet 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)

[Claims] 1. An outlet of a cooling water passage of a cylinder head is opened downward at one outer side of one end of the cylinder head in the crank axis direction, and a cylinder head is provided at one outer side of one end of the cylinder block in the crank axis direction. Of the cooling water passage and the pump casing that opens at one end surface of the cylinder block are integrally formed, and the pump casing has a suction port communicating with the lower end of the introduction passage and a discharge port communicating with the cooling water passage of the cylinder block. And a cover case having an impeller unit joined to an opening of a pump casing. 2. A pair of partition members is provided with an outlet opening downwardly at one side of one end of the cooling water passage of the cylinder head in the crankshaft direction, and at one side of one end of the cooling water passage of the cylinder block in the crankshaft direction. Is installed to define the introduction passage that connects to the outlet of the cooling water passage of the cylinder head, and a pump casing that opens at one end face of the cylinder block is integrally formed on one outside of one end of the cylinder block and is introduced into the pump casing. A water pump structure for an internal combustion engine, characterized in that an inlet communicating with the lower end of the passage and an outlet communicating with the cooling water passage of the cylinder block are provided, and a cover case having an impeller unit is joined to the opening of the pump casing. .