JPH0231539Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a water draining structure for a water pump of an engine.

[Prior Art] Conventionally, a water pump has been disposed within a belt cover that covers a timing belt attached to the front of an engine, and the pump casing of the water pump has been inserted through an opening provided in the belt cover so as to be exposed to the outside of the belt cover. In an engine in which a pulley for driving a water pump is provided outside the belt cover, a water pump drainage structure has been proposed in which drain from the water pump is discharged to the front surface of the belt cover. (Jitsukai 55-
(See Publication No. 104719).

In such a water drainage structure, the drain discharged to the front of the belt cover is scattered by the V-belt that drives the water pump, contaminating the engine room, and the drain also contains grease, etc. In the structure proposed above, the drain passage that guides the drain to the front side of the belt cover is
Because it is narrow and curved due to space constraints, there was a problem that this passage could be blocked by grease or the like.

[Purpose of the invention] The purpose of the invention is to provide a water pump drainage structure for an engine that can discharge water pump drain to the outside without interfering with not only the timing belt but also the V-belt that drives the water pump. The goal is to provide the following.

[Structure of the invention] Therefore, in the invention, the water pump is disposed within a belt cover that covers the timing belt attached to the front of the engine, and the pump casing of the water pump is inserted through an opening provided in the belt cover. In an engine in which a pulley for driving a water pump is provided on the outside of the belt cover, and a pulley for driving a water pump is provided outside the belt cover, the guide is integrated with the casing of the water pump and guides the water discharged from the drain hole of the pump toward the cylinder block side. At the same time, a groove is formed on the cylinder block side to guide the drainage from the guide section laterally, and the drainage is directed downward through the space between the back of the seal plate on the back of the timing belt cover and the end face of the cylinder block. The basic feature is that it is discharged.

[Effects of the invention] According to the invention, water pump drain is discharged downward through the space between the seal plate on the back side of the belt cover and the end face of the cylinder block, so that it does not interfere with the timing belt or the V-belt of the water pump. This eliminates the risk of condensate being scattered into the engine room and contaminating the engine room, and the existing structure can be used effectively as is.

[Example] Hereinafter, an example of the present invention will be specifically described. Note that in FIGS. 1 and 2, the drawings are simplified except for the main parts.

As shown in FIGS. 1 and 2, a timing belt 2 whose lower part is wrapped around a crank pulley 1
From the front side, from the timing belt cover 3,
The back side is accommodated in a belt chamber 5 defined by a steel plate seal plate 4, and the camshaft pulley (Fig. 2
reference).

The water pump 7 is arranged inside the timing belt cover 3, and its casing 8
The bearing portion 8a protrudes to the front side through an opening provided in the timing belt cover 3, and a V-belt pulley 9 around which a V-belt for driving the water pump 7 is wound is attached to the tip end of the bearing portion 8a.

As shown in FIGS. 1 and 2, a drain hole 10 for draining the drain accumulated in the bearing portion 8a of the water pump 7 is provided in the casing 8 of the water pump 7 to drain the drain from the drain hole 10 into a cylinder block. A guide 12 is provided to guide the drain diagonally downward toward the end surface 11e of the cylinder block 11, and a guide groove 13 is provided on the end surface of the cylinder block 11 to laterally guide the drain guided by the guide 12.

The guide groove 13 is formed along the shape of the front surface of the oil pump casing 14, which is located between the block end surface 11e, more specifically, the rear side of the crank pulley 1 and the block end surface 11e. , the drain water is guided to the gap 15 between the timing belt 2 and the seal plate 4.
Drain water flowing down through this gap 15 is guided by the outer peripheral rib 14a of the oil pump casing 14 that surrounds the outer periphery of the crank pulley 1 at an appropriate interval, and finally drips to the outside from the lowest part.
It becomes expelled.

In other words, in the structure of this embodiment, drain water is discharged to the outside through the path of drain hole 10 of water pump 7 - guide 12 - guide groove 13 - gap 15 between seal plate 4 and oil pump casing 14. This means that the drain water can be discharged to the outside without interfering with either the V-belt or the timing belt.

Therefore, contamination of the engine room due to splashing of drain water is reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory view of the front side of an engine including a water pump, and FIG. 2 is a front view of the front side of the engine. 1... Crank pulley, 2... Timing belt, 3... Timing belt cover, 4... Seal plate, 7... Water pump, 8... Casing, 10... Water drain hole, 11... Cylinder block, 12... ...Guide, 13...Guide groove, 15
……gap.

Claims (1)

[Scope of claim for utility model registration] A water pump is placed inside a belt cover that covers a timing belt attached to the front of the engine, and the pump casing of the water pump is inserted outside the belt cover by passing through an opening provided in the belt cover. In an engine which is provided with a pulley for driving a water pump on the outside of the belt cover, a guide portion is provided integrally with the casing of the water pump to guide drainage from the drain hole of the pump toward the cylinder block, A groove is formed on the cylinder block side to guide the water from the guide section laterally, and the water is discharged downward through the space between the back of the seal plate on the back of the timing belt cover and the end face of the cylinder block. An engine water pump drainage structure characterized by: