JP5477585B2 - Engine water pump equipment - Google Patents

Description

  The present invention relates to a water pump device for an engine, and in particular, to improve the productivity of the water pump. On the other hand, the foreign matter contained in the air flow generated by the rotation of the water pump pulley and the entry into the steam vent hole such as rain water falling on the water pump. The present invention relates to a water pump device for an engine for prevention.

  Conventionally, as described in Patent Document 2 (see FIG. 1 and FIG. 2 in particular) described later, a steam vent hole (in this Patent Document 2, “steam hole” is specified) is opened above the water pump. There is something.

JP 2000-213349 A Japanese Utility Model Publication No. 5-58831

By the way, in the structure disclosed in the above-mentioned Patent Document 2, since the steam vent hole is opened upward, rainwater or foreign matters that have dropped on the water pump can easily enter the steam vent hole. There is a risk that the sealing performance in the water pump may be deteriorated by rainwater or foreign matter entering from the water.
Further, in order to prevent rainwater or foreign matters falling above the water pump from entering the steam vent hole extending in the vertical direction, conventionally, as described in Patent Document 1, the top of the steam vent hole is covered. There was one provided with a cover portion extending from the steam vent hole to the vicinity of the pulley.
That is, as shown in FIG. 8, a rotary shaft 122 having a pulley bracket 141 and an impeller 121 of a water pump pulley (not shown) attached to both ends in the axial direction is rotated to a pump housing 124 of the water pump 112 via a bearing 123. Support freely.
The pump housing 124 includes a pump housing portion 125 in which the impeller 121 is disposed, and a bearing housing portion 126 that holds the bearing 123, and seals the pump housing portion 125 and the bearing housing portion 126. 127 is disposed at the boundary between the pump housing part 125 and the bearing housing part 126.
A space 128 into which water vapor generated between the seal member 127 and the rotating shaft 122 flows is formed between the bearing 123 and the seal member 127, and a water drain hole 130 is formed in the outer peripheral wall of the space 128. And a steam release hole 131 are formed.
At this time, a cover part 142 that covers the steam vent hole 131 is provided, and a steam vent passage 143 is formed in the cover part 142 by drilling.
However, in the case of the structure disclosed in Patent Document 1, the length of the steam vent passage 143 extending in the axial direction of the rotary shaft 122 from the tip end portion of the cover portion 142 (in the vicinity of the pulley bracket 141) to the steam vent hole 131 is the length. There is an inconvenience that it becomes longer (in other words, “the depth becomes deeper”) and it is difficult to form the steam release passage 143 by casting.
Therefore, it is necessary to work to form the steam vent passage 143 from the front end portion of the cover portion 142 to the steam vent hole 131 by drilling after casting, which has the disadvantage of reducing productivity.

  In the water pump device of the engine, this invention improves the productivity of the water pump and prevents foreign matter contained in the airflow generated by the rotation of the water pump pulley or rainwater falling on the water pump from entering the steam vent hole. The purpose is to prevent.

Accordingly, in order to eliminate the above-described disadvantages, the present invention includes a pump housing fixed to a side surface extending in the crankshaft direction of the engine, and a water pump pulley and an impeller attached to both end portions in the axial direction. A shaft is rotatably supported on a pump housing of a water pump via a bearing, and a pump housing portion in which the impeller is disposed in the pump housing and a bearing housing portion that holds the bearing are provided, and the pump housing portion A seal member that partitions the bearing housing portion is disposed at a boundary between the pump housing portion and the bearing housing portion, and a space portion into which water vapor generated between the seal member and the rotating shaft flows is formed between the bearing and the bearing. formed between the seal member, and a drain hole and steam vent hole formed on the outer peripheral wall of the space portion In the water pump system of an engine to discharge the inside space of the water pump pulley through drain passage formed water flowing out from the water drain hole in the bearing housing portion, said bearing housing portion, said rotary shaft And a reinforcing rib that extends in the radial direction of the cross section and protrudes in the horizontal direction toward the engine, and is below the reinforcing rib and faces the engine. The steam vent hole is opened at a position, protrudes in a direction perpendicular to the rotation shaft from the bearing housing portion, and a vertical wall portion whose upper end portion is connected to the reinforcing rib is connected to the steam vent hole and the water pump pulley. And outside the water pump pulley .

According to the present invention, the pump housing includes the reinforcing rib that protrudes in the horizontal direction from the bearing housing portion and connects the pump housing portion and the bearing housing portion due to the structure of the characteristic portion described above, and below the reinforcing rib. Reinforcement that extends in the horizontal direction when rainwater or foreign matter that falls above the water pump (bearing housing part) flows along the outer peripheral surface of the water pump (bearing housing part) by opening the steam vent hole The ribs allow rainwater and foreign matter to fall outward from the outer peripheral surface of the water pump (bearing housing portion) and fall downward.
As a result, it is possible to suppress rainwater and foreign matter falling on the water pump from entering the steam vent hole, and to prevent entry into the water pump (space portion).
Further, when the water pump pulley attached to the rotating shaft is rotated, air is pulled by the rotation of the water pump pulley in the vicinity of the water pump pulley, and an airflow flowing in the rotation direction of the water pump pulley is generated.
At this time, the airflow hits the reinforcing rib and flows in the direction of the steam vent hole along the lower surface of the reinforcing rib.
Therefore, the feature portion of the present invention “a vertical wall portion that protrudes from the bearing housing portion in a direction perpendicular to the rotation axis and whose upper end portion is connected to the reinforcing rib is formed between the steam vent hole and the water pump pulley”. In this structure, the reinforcing rib is connected between the steam vent hole and the water pump pulley, and the vertical wall portion orthogonal to the axial direction of the rotating shaft is formed, so that the vertical wall portion faces the steam vent hole. The airflow that is about to flow can be guided downward.
As a result, since the air flow including the foreign matter flows downward along the vertical wall portion, the foreign matter and the air flow can be kept away from the steam vent hole, and the foreign matter and the like can be prevented from entering the steam vent hole.
Furthermore, the structure of the characterizing portion of the present invention eliminates the need for a cover portion that covers the steam vent hole, so that drilling is not performed on the cover portion, and the productivity of the water pump (or pump housing) can be improved.

FIG. 1 is a rear view of the water pump. (Example) FIG. 2 is a front view of the engine. (Example) FIG. 3 is a side view of the engine. (Example) FIG. 4 is a schematic side view of the water pump as viewed from the water pump pulley side. (Example) FIG. 5 is a bottom view of the water pump as viewed from below. (Example) 6 is a sectional view taken along line VI-VI in FIG. (Example) FIG. 7 is a schematic sectional view taken along line VII-VII in FIGS. 1 and 6. (Example) FIG. 8 is a schematic sectional view of a water pump showing the prior art of the present invention.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

1 to 7 show an embodiment of the present invention.
2 and 3, reference numeral 1 denotes an engine.
2 and 3, the engine 1 includes a cylinder block 2, a cylinder head 3 placed on the cylinder block 2, a cylinder head cover 4 placed on the upper surface of the cylinder head 3, And an oil pan 5 attached to the lower surface of the cylinder block 2.

2 and 3, the engine 1 includes an intake manifold (not shown) attached to one side of the engine (left side in FIG. 3), an exhaust manifold 6 attached to the other side of the engine (right side in FIG. 3), and And a catalytic converter 7 attached to the downstream side of the exhaust manifold 6.
Therefore, the intake manifold, the exhaust manifold 6 and the catalytic converter 7 constitute an intake system and an exhaust system of the engine 1.
An air conditioning compressor 8 is disposed obliquely below the exhaust manifold 6 as shown in FIG.
The air-conditioning compressor 8 is disposed using an excess space obliquely below the exhaust manifold 6.

Further, as shown in FIG. 3, the engine 1 has a crankshaft 9 rotatably supported on the cylinder block 2.
Further, the engine 1 is provided with a chain case 10 that covers a timing chain (not shown) and whose both sides in the width direction are fastened to the cylinder head 3 and the cylinder block 2.
Therefore, since the chain case 10 covers the timing chain, noise generated in the timing chain can be reduced, and damage to the timing chain due to external force can be prevented.
The chain case 10 is attached to the block end surface of the cylinder block 2 of the engine 1.
At this time, on the right side of the engine 1, as shown in FIG. 3, the generator 11 is disposed at the lower part on the intake side, which is the left side in FIG.
Further, on the right side surface of the engine 1, when the water pump 12 is disposed on the exhaust side upper part which is the left side of the side wall 2a of the cylinder block 2 in FIG. 2 and on the exhaust side upper part which is the right side in FIG. In both cases, the air conditioning compressor 8 is disposed below the water pump 12.
The crank pulley 13 provided at the end of the crankshaft 9 of the engine 1, the generator pulley 14 of the generator 11, the water pump pulley 15 of the water pump 12, and the air conditioning compressor pulley of the air conditioning compressor 8. 16 is connected to the driving force transmission belt 17 and tension is applied to the driving force transmission belt 17 by the auto tensioner pulley 18 and the first and second idler pulleys 19 and 20 disposed between the pulleys.
Therefore, the generator 11, the water pump 12, and the air conditioning compressor 8 can be disposed close to the engine 1, so that the engine 1 can be reduced in size and can be mounted on a vehicle.

In the water pump device of the engine 1, the water pump pulley 15 and the impeller 21 are attached to both ends in the axial direction, and the rotating shaft 22 having the rotation center O is rotated to the pump housing 24 of the water pump 12 via the bearing 23. A pump housing portion 25 that is supported freely and in which the impeller 21 is disposed in a pump chamber 12 a in the pump housing 24 and a bearing housing portion 26 that holds the bearing 23 are provided.
A seal member 27 for partitioning the pump housing portion 25 and the bearing housing portion 26 is disposed at the boundary between the pump housing portion 25 and the bearing housing portion 26, and between the seal member 27 and the rotary shaft 22. Is formed between the bearing 23 and the seal member 27, and a drain hole 30 and a steam vent 31 are formed in the outer peripheral wall 29 of the space 28. .
In the water pump device of the engine 1, the pump housing 24 includes a reinforcing rib 32 that protrudes in a horizontal direction from the bearing housing portion 26 and communicates the pump housing portion 25 and the bearing housing portion 26. The steam vent hole 31 is opened below the reinforcing rib 32 and protrudes from the bearing housing portion 26 in a direction perpendicular to the rotating shaft 22, and the upper end portion of the vertical wall portion 33 is connected to the reinforcing rib 32. Is formed between the steam vent hole 31 and the water pump pulley 15.
Specifically, the water drain hole 30 and the steam vent hole 31 are formed in the outer peripheral wall 29 of the space 28 as shown in FIG.
At this time, the drainage hole 30 is formed in the lower portion of the bearing housing portion 26 and guides the cooling water flowing into the space portion 28 to the drainage passage 34. A sealing ball 35 is disposed at the lower end of the drainage passage 34. Further, as shown in FIG. 6, the drainage passage 34 is formed from the drainage hole 30 side on the vehicle left side (right side in FIG. 6) toward the vehicle right side (left side in FIG. 6). A plug 37 is provided at the end to discharge outside through a groove 36 when a certain amount or more of cooling water has accumulated.
As shown in FIG. 7, the pump housing 24 includes a reinforcing rib 32 that protrudes horizontally from the bearing housing portion 26 and communicates the pump housing portion 25 and the bearing housing portion 26.
At this time, the vapor vent hole 31 is opened below the reinforcing rib 32.
That is, as shown in FIG. 7, the steam vent hole 31 is formed in the outer peripheral wall 29 below the reinforcing rib 32, and the formation height position is made higher than the water drain hole 30 to efficiently discharge steam. I am trying.
Further, as shown in FIGS. 1 and 5, the vertical wall portion 33 protrudes from the bearing housing portion 26 in a direction orthogonal to the rotation shaft 22, and its upper end portion is connected to the reinforcing rib 32, It is formed between the steam vent hole 31 and the water pump pulley 15.
Therefore, the pump housing 24 includes the reinforcing rib 32 that protrudes in the horizontal direction from the bearing housing portion 26 and connects the pump housing portion 25 and the bearing housing portion 26 according to the structure of the characteristic portion described above. When the steam vent hole 31 is opened downward, rain water, foreign matter, or the like falling above the water pump 12 (bearing housing portion 26) flows along the outer peripheral surface of the water pump 12 (bearing housing portion 26). In addition, rainwater and foreign matter can be moved away from the outer peripheral surface of the water pump 12 (bearing housing portion 26) and dropped downward by the reinforcing rib 32 extending in the horizontal direction.
Thereby, it is possible to prevent rainwater and foreign matters (see white arrows in FIG. 7) falling on the water pump 12 from entering the steam vent hole 31 and to prevent the water pump 12 from entering the space (the space portion 28). .
Further, when the water pump pulley 15 attached to the rotary shaft 22 rotates, in the vicinity of the water pump pulley 15, air is pulled by the rotation of the water pump pulley 15, and an airflow that flows in the rotation direction of the water pump pulley 15 is generated. .
At this time, the airflow hits the reinforcing rib 32 and flows in the direction of the steam release hole 31 along the lower surface of the reinforcing rib 32.
Therefore, in the present invention, “the vertical wall portion 33 protruding from the bearing housing portion 26 in the direction orthogonal to the rotation shaft 22 and having the upper end portion connected to the reinforcing rib 32 is provided between the steam vent hole 31 and the water pump pulley 15. In the structure of the characteristic portion, the vertical wall portion 33 connected to the reinforcing rib 32 and perpendicular to the axial direction of the rotating shaft 22 is formed between the steam vent hole 31 and the water pump pulley 15. The vertical wall portion 33 can guide downward the airflow that is about to flow toward the vapor vent hole 31.
As a result, since the air flow including the foreign matter flows downward along the vertical wall portion 33, the foreign matter and the air flow can be kept away from the steam vent hole 31, and the foreign matter and the like can be prevented from entering the steam vent hole 31. .
Furthermore, the structure of the characteristic portion of the present invention eliminates the need for a cover portion that covers the steam vent hole 31, so that drilling is not performed on the cover portion, and the productivity of the water pump 12 (or the pump housing 24) is improved. It can be improved.

When the engine 1 is mounted on a vehicle, as shown in FIGS. 4 and 5, the water pump 12 is disposed on the front side of the engine 1 in the traveling direction of the vehicle, and the steam vent 31 is disposed on the engine 1 side. Open.
As a result, the traveling wind and the foreign matter contained in the traveling wind do not reach the steam vent 31 directly, and foreign matter contained in the running wind can be prevented from entering the steam vent 31.

Reference numeral 38 denotes a pulley sheet of the water pump pulley 15.
Reference numeral 39 denotes a heater outlet pipe for guiding cooling water from a heater (not shown) to the water pump 12, and the heater outlet pipe 39 is provided from the rear side of the cylinder block 2 as shown in FIGS. Through the left side, it reaches the side wall 2a and is connected to the water pump 12.
At this time, a thermostat 40 is disposed in the vicinity of the water pump 12, and the thermostat 40 switches and controls the flow of cooling water between the water pump 12 and a radiator (not shown) according to the cooling water temperature. doing.

DESCRIPTION OF SYMBOLS 1 Engine 2 Cylinder block 6 Exhaust manifold 7 Catalytic converter 9 Crankshaft 12 Water pump 12a Pump chamber 15 Water pump pulley 17 Driving force transmission belt 21 Impeller 22 Rotating shaft 23 Bearing 24 Pump housing 25 Pump housing portion 26 Bearing housing portion 27 Seal Member 28 Space 29 Peripheral wall 30 Drain hole 31 Steam vent 32 Reinforcement rib 33 Vertical wall

Claims (2)

The water pump has a pump housing fixed to the side that extends in the crankshaft direction of the engine, and a rotary shaft with a water pump pulley and an impeller attached to both ends in the axial direction is rotatable to the water pump pump housing via bearings. The pump housing part is provided with a pump housing part in which the impeller is disposed in the pump housing and a bearing housing part for holding the bearing, and a seal member for partitioning the pump housing part and the bearing housing part is provided in the pump housing part And a space where water vapor generated between the seal member and the rotating shaft flows is formed between the bearing and the seal member, and an outer periphery of the space portion. wall to form a drain hole and steam vent hole, the bearing housing water flowing out from the water drain hole In the water pump system of an engine to discharge the inside space of the water pump pulley through the water drain passage formed in the bearing housing portion has an arcuate cross-section of the rotating shaft concentric, and The bearing housing includes a reinforcing rib extending in a radial direction of the cross section and projecting in a horizontal direction toward the engine side , and the steam vent is opened at a position below the reinforcing rib and facing the engine. A vertical wall portion projecting in a direction perpendicular to the rotation axis from the portion and having an upper end portion connected to the reinforcing rib between the steam vent hole and the water pump pulley and outside the water pump pulley. A water pump device for an engine, characterized in that it is formed. Case of mounting the engine on the vehicle, the water pump is a water pump device for an engine according to claim 1, characterized in that that will be disposed on the front side of the engine in the direction of travel of the vehicle.

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