JP3146654B2 - Water pump mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a water pump, and more particularly to a mounting structure for mounting a timing belt cover on a front wall of a cylinder block provided with a mounting bolt for a cylinder block and through the timing belt cover. The present invention relates to a water pump mounting structure in which a water pump pulley is disposed outside a timing belt cover through a hole.

[0002]

2. Description of the Related Art There are two types of cooling systems for automobile engines: a water-cooled type and an air-cooled type. The air-cooled type has a simple structure and is easy to handle, but since the temperature control is difficult and the noise is large, a water-cooled type engine is generally used in many cases.

[0003] In the water-cooled type, heat generated by the engine is cooled by cooling water. This cooling water is forcibly circulated by a water pump. The heat conducted to the cooling water is radiated to the atmosphere by the radiator.

Further, the water-cooled type is easy to control the temperature, and the noise such as the combustion noise in the cylinder and the noise of the piston are blocked by the water jacket. It is quiet.

[0005] The water pump uses a timing belt, a V-belt, a gear, a chain or the like to transmit the rotational force of a crankshaft extending substantially in the center of a cylinder block constituting the engine in a longitudinal direction of the engine. The cooling water is transmitted to the impeller via a pump bearing so as to exhibit a pump function and circulate the cooling water.

As disclosed in Japanese Utility Model Laid-Open Publication No. 1-141323, a water pump body is mounted on an engine block of an internal combustion engine with bolts and sealed to form a vortex chamber. In the cooling water circulation water pump to be formed, the water pump mounting surface is provided with an air vent groove communicating the mounting bolt boss hole at the top of the water pump and the water pump vortex chamber top, and the mounting bolt boss portion is provided. In some cases, a seal washer was arranged between the surface and the tightening surface of the mounting bolt.

[0007]

As a conventional water pump, as shown in FIG. 2, one end of a water pump case 116 (see FIG. 2) is mounted on a front wall 104 of a cylinder block 102 on which a timing belt cover 132 is disposed. 2 (right side in FIG. 2) is fixed by a block mounting bolt 124. The water pump case 11
A block oil seal member 144 is interposed at a contact portion between the cylinder block 102 and the cylinder block 102.

The other end (left side in FIG. 2) of the water pump case 116 penetrates a through hole 134 provided in the timing belt cover 132 and protrudes outside the timing belt cover 132. A cover oil seal member 136 is interposed at a contact portion between the through hole portion 134 and the water pump case 116.

As a result, when the water pump case 116 vibrates during operation of the water pump 114 or the like, the water pump case 116 comes into contact with the cover oil seal member 136, and the cover oil seal member 13
6 is worn, causing poor sealing and generating abnormal noise, which is disadvantageous in practical use.

Further, the water pump case 116
Is simply fixed only to the cylinder block 102 by the block mounting bolts 124, the mounting strength of the water pump 114 is insufficient, and the distortion when a force is applied to the water pump case 116 increases. There was a disadvantage that it was disadvantageous.

[0011]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention is characterized in that a timing belt cover is fixed to a front wall of a cylinder block by a cylinder block mounting bolt, and the timing belt cover is fixed. In a water pump mounting structure in which a water pump pulley is disposed outside a timing belt cover through a through hole of a belt cover, the water pump is a water pump case fixed to the cylinder block, and the water pump is A shaft body which is supported by a case and has an impeller fixedly provided at one end thereof and the water pump pulley fixedly provided at the other end thereof. The fixed block mounting boss and the timing And a cover mounting boss portion to which the cover is fixed by a timing belt cover mounting bolt, wherein the cover mounting boss portion is closer to the shaft body than the block mounting boss portion and is a peripheral edge of the through-hole portion. The timing belt cover is provided on the rear side of the water pump pulley, and the timing belt cover is fixed to the cover mounting boss portion by a timing belt cover mounting bolt.

[0012]

According to the invention described above, the mounting boss portion for the block of the water pump case is fixedly mounted on the cylinder block with the mounting bolt for the cylinder block, and the timing belt cover is mounted on the mounting boss portion for the cover of the water pump case. Since the water pump is fixed by the belt cover mounting bolts, the mounting rigidity of the water pump is improved, and the distortion of the water pump when the engine is driven is reduced.

[0013]

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

FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a cylinder block of an engine (not shown).

The engine (not shown) is constructed by mounting a cylinder head (not shown) on a cylinder block 2.

On the front wall 4 of the cylinder block 2,
At a substantially central portion of the engine 2, a crankshaft (not shown) oriented in the longitudinal direction, that is, in the front-back direction, is rotatably provided.

The front wall 4 of the cylinder block 2
Is formed with a pump mounting portion 6. The pump mounting portion 6 is formed by a block-side mounting boss 7, a block-side bolt hole 8, a mounting recess 10, and a block-side engaging portion 12. The block-side mounting boss portion 7 of the pump mounting portion 6 is for mounting a water pump 14 described later.

The water pump 14 has a water pump case 16, a shaft 18 and an impeller 20. At one end (the right side in FIG. 1) of the water pump case 16 is formed a fitting projection 22 that fits into the block-side engaging portion 12, and is fixed to the block-side mounting boss 7 at an outer peripheral portion. A mounting boss portion 23 for a block to be provided is formed.
3, a case-side bolt hole 26 through which a cylinder block mounting bolt (hereinafter referred to as “block mounting bolt”) 24 is inserted. The water pump case 16 is provided with a cover mounting boss 27 which is located on the inner peripheral side of the block mounting boss 23.
The cover mounting boss portion 27 is
The water pump pulley 40 is provided closer to the shaft body 18 than the
It is provided on the back side of. The cover-side mounting boss 27 has a case-side bolt hole 54.
A drain hole 28 is formed in an intermediate portion of the water pump case 16.

The other end (left side in FIG. 1) of the water pump case 16 is provided with a timing belt 30.
The timing belt cover 32 penetrates through holes 34 provided in the timing belt cover 32 surrounding the timing belt cover 32.
It is projected outside.

An oil seal member 36 for a cover is provided at a contact portion between the through hole 34 and the water pump case 16.
Is interposed.

In the water pump case 16, a shaft 18 is supported by a bearing member 38. The shaft body 18 has an impeller 20 fixed at one end (right side in FIG. 1), and a water pump pulley 40 fixed at the other end (left side in FIG. 1) via a pulley fixing member 42. ing. The water pump pulley 40 attached to the other end portion of the shaft body 18 is positioned close to the block mounting boss portion 23 and at the outer periphery of the cover mounting boss portion 27 so as to be located on the intermediate portion side. It is provided to be biased.

The water pump 14 has a projection 22 fitted into the block-side engaging portion 12 of the pump mounting portion 6 so that the impeller 20 is positioned in the mounting recess 10 of the cylinder block 2. A block oil seal member 44 is provided between the block side engaging portion 12 and the fitting portion 22.
Is interposed. The water pump 14 is fastened and fixed to the pump mounting portion 6 by block mounting bolts 24. At this time, a vortex chamber 46 is formed by the impeller 20 and the mounting recess 10.

Further, mounting bolts (hereinafter, referred to as “cover mounting bolts”) 48 for fixing the timing belt cover 32 to the water pump 14 are provided. The timing belt cover 32 is attached to the water pump case 16.

More specifically, a cover-side mounting boss portion 50 fixed to the cover mounting boss portion 27 of the water pump case 16 is provided at a peripheral portion of the through hole portion 34 of the timing belt cover 32. A cover-side bolt hole 52 is provided in the cover-side mounting boss 50 to allow the cover mounting bolt 48 to pass therethrough.

The cover-side bolt hole 52 is provided at a position corresponding to the case-side bolt hole 54 for fixing the timing belt cover 32 of the water pump case 16. The water pump case 16 and the timing belt cover 32 are fixed to each other with the cover mounting bolts 48, and the water pump case 16 is supported by the cylinder block 2 and the timing belt cover 32.

Next, the operation will be described.

In the water pump 14, the block mounting boss 23 of the water pump case 16 is fixedly mounted on the block side mounting boss 7 of the cylinder block 2 with the block mounting bolt 24, and the water pump case 16 is mounted on the block. The cover-side mounting boss portion 50 of the timing belt cover 32 is fixed to the cover mounting boss portion 27 on the inner peripheral side of the boss portion 23 with the cover mounting bolt 48.

As described above, the mounting structure of the water pump 14 is such that the water pump case 16 is fixed to the cylinder block 2 with the block mounting bolts 24, and the timing belt cover 32 is fixed to the water pump case 16 with the cover mounting bolts 48. Is fixed, the water pump case 16 can be supported by the cylinder block 2 and the timing belt cover 32.
The rigidity of mounting the water pump 14 can be improved, and the distortion of the water pump 14 when the engine (not shown) is driven can be reduced, which is practically advantageous.

The water pump 14 is mounted on the water pump 1 when the engine (not shown) is driven.
4 can reduce the distortion of the water pump 1
Water pump case 16 and other parts due to the vibration of 4,
For example, wear due to contact with the cover-side oil seal member 36 can be reliably prevented, and the service life of the water pump case 16 and the cover-side oil seal member 36 can be extended.
Economically advantageous.

[0030]

As described above in detail, according to the present invention, the mounting boss for the block of the water pump case is fixed to the cylinder block, and the timing belt cover is fixed to the mounting boss for the cover of the water pump case. As a result, the mounting rigidity of the water pump can be improved,
Can reduce the distortion of the water pump when driving the engine,
It is practically advantageous. Also, by reducing distortion of the water pump when the engine is running, wear due to contact between the water pump and other parts due to vibration of the water pump can be prevented, and the service life of the water pump and other parts can be extended. It is economically advantageous.

[Brief description of the drawings]

FIG. 1 is a schematic enlarged sectional view of a water pump showing an embodiment of the present invention.

FIG. 2 is a schematic enlarged sectional view of a water pump showing a conventional technique of the present invention.

[Explanation of symbols]

 2 Cylinder block 4 Front wall 6 Pump mounting part 7 Block side mounting boss part 8 Block side bolt hole part 10 Mounting concave part 12 Block side engaging part 14 Water pump 16 Water pump case 18 Shaft 20 Impeller 22 Fitting convex part 23 For block Mounting boss 24 Block mounting bolt 26 Case side bolt hole 27 Cover mounting boss 28 Drain hole 30 Timing belt 32 Timing belt cover 34 Through hole 36 Cover oil seal member 38 Bearing member 40 Water pump pulley 42 Pulley fixing member 44 Block oil seal member 46 Vortex chamber 48 Cover mounting bolt 50 Cover side mounting boss 52 Cover side bolt hole 54 Case side bolt hole

Claims (1)

(57) [Claims] 1. A water pump which is fixed to a front wall of a cylinder block on which a timing belt cover is disposed by mounting bolts for the cylinder block and which passes through a through hole of the timing belt cover and is outside the timing belt cover. Water pump with pulleys
In the mounting structure, the water pump is the cylindrical
The water pump case fixed to the
The impeller is supported at one end by the water pump case.
The water pump pulley is fixedly installed at the other end.
The water pump case.
Mounting bolts for cylinder block on cylinder block
Mounting boss part fixed by
G belt cover is a timing belt cover mounting bolt
And a cover mounting boss secured by the cover.
-The mounting boss for the block is more than the mounting boss for the block.
On the side close to the shaft body and at the periphery of the through hole
On the back side of the water pump pulley.
Provided by positioning, the mosquito the timing belt cover
Mounting bolt for timing belt cover on bar mounting boss
Mounting structure of the water pump, characterized in that fixed by preparative.