JP4071326B2 - Water pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water pump in an engine water cooling device, and more particularly to a cooling water channel partition structure in a water pump.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an engine water cooling apparatus having the following configuration is known (see Japanese Utility Model Laid-Open No. 5-33643).
In other words, this engine water cooling system is of the inlet control circuit type, and the engine cylinder jacket is passed through the head jacket, the radiator, the thermostat, and the water pump in this order so as to circulate to the cylinder jacket. A thermostat housing is fixed to the front surface of the engine cylinder block, and the head jacket communicates with the thermostat stat outlet side chamber via a bypass passage.
[0003]
In this prior art, the cooling water passage in the water pump, that is, the cooling water passage portion through which the cooling water flows from the radiator side and flows out to the engine side, is formed by the structure of the cylinder block wall itself. Is divided into an inflow side and an outflow side.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional engine water cooling system, the cooling water passage in the water pump is divided into the cooling water inflow side and the outflow side by the structure of the cylinder block wall itself. The structure of the cooling water passage partitioning part in the water pump is also given to the cylinder block, so the structure of the cylinder block is complicated, the formability is inferior, and the productivity and productivity are reduced. There is a problem that the engine itself is also increased in size.
[0005]
Therefore, in view of the conventional problems as described above, the present invention aims to improve manufacturability and productivity, and reduce the number of parts and manufacture by improving the cooling water passage partition structure in the water pump in the engine water cooling system. The purpose is to improve the workability related to the above and to reduce the engine size.
[0006]
[Means for Solving the Problems]
For this reason, the invention according to claim 1
A cooling water passage portion that opens toward the open end surface, and a cover that is formed at each of the open end surface between the periphery of the cooling water passage portion and the outer edge of the open end surface;
A partition plate that is fitted and fixed between the open end surface of the cover and the engine body side to which the cover is attached while being fitted in the concave groove ;
With
The partition plate is configured to partition the cooling water passage portion into an inflow side and an outflow side of the cooling water.
[0007]
The invention according to claim 2
The cooling water flows in from the inflow side of the cooling water passage portion and flows out from the outflow side including an opening formed at a position corresponding to the center portion of the pump impeller .
[0008]
The operation of the present invention will be described.
In the invention according to claim 1, the cooling water flows into the inflow side to the outflow from the outflow side which is partitioned between inlet side by a partition plate.
In the invention according to claim 2, the structure of the cooling water passage portion is simplified.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First, the configuration of the engine water cooling apparatus will be described with reference to FIG.
That is, the engine water cooling apparatus includes a cooling water path 5 from the engine 1 to the engine 1 through the radiator 3, the thermostat 2, and the water pump 4, and bypasses the radiator 3 to supply the outlet water of the engine 1 to the thermostat 2. A bypass passage 6 is provided for flow.
[0010]
1 to 3 are a front view, a rear view, and a cross-sectional view taken along the line A-O-A in FIG. 1 showing a specific configuration of the cover 9 of the water pump 4 described above.
In these drawings, for example, a cover 9 of an aluminum water pump 4 is integrally formed with a boss 10 in the left region of the left and right regions of FIG. The bearing 12 of the pump rotary drive shaft 11 is supported.
[0011]
A pump drive pulley 13 is connected to the outer end portion of the pump rotation drive shaft 11, and an impeller 14 is connected to the inner end portion.
A mounting flange 15 is integrally formed around the cover 9, and a plurality of bolt insertion holes 16 are formed in the mounting flange 15.
Further, in the cover 9, a cooling water passage portion 17 is formed through which cooling water flows from the radiator 3 side and flows out to the engine 1 side.
[0012]
The cooling water passage portion 17 is divided into an inflow side 19 and an outflow side 20 by a partition plate 18 interposed and fixed between the open surface side of the cover 9 and the wall of the gear case 8 to which the cover 9 is attached. ing.
This partition plate 18 is formed in the shape shown in FIG. 4, an opening 18 </ b> A is formed in the region on the right side of the figure, and three attachment portions 18 </ b> B are provided on the periphery.
[0013]
The three attachment portions 18B are fitted and attached to attachment portions formed as concave grooves 9a on the open end surface of the cover 9.
Accordingly, the cooling water from the radiator 3 side flows in from the inflow side 19 and flows out from the outflow side 20 formed of the opening 18A formed at a position corresponding to the center portion of the impeller 14 of the partition plate 18 and then enters the engine 1 side. It reaches.
[0014]
On the other hand, the groove 9A is integrally formed in the peripheral portion of the right region of the left and right regions of the cover 9 in FIG.
The concave groove 9A is formed in a substantially semicircular cross section.
A passage portion is formed on the joint surface between the gear case 8 and the cover 9 of the water pump. The passage portion is formed by concave grooves 8A and 9A integrally formed on the mutual joint surface. The
[0015]
The thermostat 2 is attached to the inside of the cover 9 of the water pump 4, communicates with the bypass passage outlet 6 A of the cover 9 and the inflow side of the bypass passage 6 of the thermostat 2, and the engine side cooling water passage of the gear case 8. The outlet part of the passage part communicating with the inflow side 6B of the bypass passage 6 is communicated.
Therefore, the cooling water from the cylinder head side (engine 1 side) flows in from the inflow side 6B of the bypass passage 6, passes through the bypass passage 6, flows out of the outflow side 6A, and reaches the thermostat 2 side.
[0016]
According to the cooling water passage partition structure of the water pump 4 in the engine water cooling apparatus having such a configuration, the water pump 4 is interposed between the open surface side of the cover 9 of the water pump 4 and the wall of the engine body side gear case 8 to which the cover 9 is attached. As a result of providing the partition plate 18 to be fixed and partitioning the cooling water passage portion 17 into the cooling water inflow side 19 and the outflow side 20 by the partition plate 18, the cooling water passage portion 17 in the water pump 4 is changed. The structure of the cylinder block wall itself does not complicate the structure of the cylinder block as in the case of partitioning into the cooling water inflow side and the outflow side, and a separate partition plate 18 is provided. Since it is only necessary to interpose and fix the cover 9 to the gear case 8, it is excellent in moldability and advantageous in terms of manufacturability and productivity. It is not necessary to provide a portion functioning Te, it is possible to achieve also the size of the engine body.
[0017]
【The invention's effect】
As described above, according to the first aspect of the present invention, the cooling water passage portion opening toward the open end, and the open end surface from the periphery of the cooling water passage portion to the outer edge of the open end surface. A cover formed with a groove between each, and a partition plate fitted and fixed between the open end surface of the cover and the engine body side to which the cover is attached while being fitted in the groove , This partition plate partitions the cooling water passage into the cooling water inflow side and the outflow side, so that it is possible to improve manufacturability and productivity, as well as to reduce the number of parts and to improve workability related to manufacturing. The engine can be downsized.
[0018]
According to the invention which concerns on Claim 2, the structure of a cooling water channel | path part can be simplified and the effect of the invention which concerns on Claim 1 can be exhibited more effectively.
[Brief description of the drawings]
FIG. 1 is a plan view of a water pump cover for explaining an embodiment of a bypass passage structure in a water cooling system for an engine of the present invention. FIG. 2 is a rear view of the water pump cover. FIG. 4 is a plan view of a partition plate according to the same embodiment as above. FIG. 5 is a schematic diagram showing a water cooling device for an engine for explaining the prerequisite technology of the present invention.
1 Engine 2 Thermostat 3 Radiator 4 Water Pump 5 Cooling Water Circulation Path 6 Bypass Path 7 Engine Body 8 Gear Case 9 Cover 18 Partition Plate

Claims (2)

A cooling water passage portion that opens toward the open end surface, and a cover that is formed at each of the open end surface between the periphery of the cooling water passage portion and the outer edge of the open end surface;
A partition plate that is fitted and fixed between the open end surface of the cover and the engine body side to which the cover is attached while being fitted in the concave groove ;
With
A water pump characterized in that the cooling water passage section is partitioned into an inflow side and an outflow side of the cooling water by the partition plate. Cooling water, the water pump according to claim 1, wherein the flowing out of the flow from the inflow side of the cooling water passage consists of an opening formed in a position corresponding to the pump impeller center to the outflow side.

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