KR950000328Y1 - Cooling structure of engine - Google Patents

Abstract

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Description

Cooling system structure of the engine

1 is an enlarged cross-sectional view of an essential part of an engine of a first embodiment of the present invention;

2 is a schematic front view of the engine of FIG.

3 is an enlarged cross-sectional view of an essential part of an engine showing the prior art corresponding to the first embodiment of the present invention.

4 is a front view of an engine showing a second embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view of a main part by line II-II of FIG.

6 (a) is a front view of the timing chain cover.

6 (b) is a central longitudinal cross-sectional view of FIG. 6 (a).

7 is a front view of an engine showing a conventional technique corresponding to the second embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

102: V engine 104: cylinder block

118: water pump 120: timing chain cover

122: insertion hole for crankshaft 124: inner pulley

126: outer pulley 128: gear unit for driving the oil pump

130: gear part for the timing chain 132: first auxiliary drive pulley

134: second auxiliary drive pulley 136: water pump shaft

138: water pump cover 140: first bearing for the water pump

142: cooling fan 144: cooling fan shaft

146: second bearing for the cooling fan 148: water pump pulley

150: mounting hole 202: engine

204: Cylinder block 206-1: First cylinder head

206-2: second cylinder head 208-1: first cylinder head cover

208-2: second cylinder head cover 216: cooling fan

218: timing chain cover 220: fastening bolt hole

222: fixing bolt hole 224: rotating shaft

226: fixing bolt

[Industrial use]

The present invention relates to a cooling system structure of an engine, and more particularly, to a cooling system structure of an engine having a water pump installed at an end surface of a cylinder block in a timing chain cover attached to one end of the engine and a cooling fan arranged outside the timing chain cover. .

The present invention also relates to a cooling system fixing structure for an engine in which a cooling fan is provided on one side of the engine, a timing chain for driving the cooling fan, and the timing chain is covered with a chain cover.

[Prior art]

In the engine of a vehicle, there are a series engine in which cylinders are arranged in series according to the arrangement form of cylinders, and a V engine in which cylinders are arranged in V type.

In the V-shaped engine, the first and second cylinder heads are placed on the upper portion of the V-shaped cylinder block, and the cylinder bank is formed in a V shape. The crankshaft which is provided in the longitudinal direction of a V-shaped engine in the substantially center part of the said cylinder block is provided so that rotation is possible. This crankshaft drives auxiliary such as a camshaft and a water pump of the same valve system.

In addition, as an engine water pump, an impeller is fixed to a pump shaft as disclosed in Japanese Patent Application Laid-Open No. 61-108895, and the water pump of the engine provided with a mechanical seal for watertightening the bearing of the pump shaft, There was a water drainage hole in which one end was opened to the seal face of the mechanical seal and the other end was opened to the suction side of the pump chamber.

As the arrangement of the cooling water pump and the cooling fan, as described in Japanese Patent Application Laid-Open No. 64-13226, the cover of the one side of the engine constituting one casing of the cooling water pump is shifted from the rotational axis of the cooling water pump. There existed one which arranged the rotation shaft of a cooling fan in parallel with this.

In addition, the V-type engine has a space portion formed between the cylinder banks on each side, and the air intake manifold is arranged in this space portion.

In addition, the V-type engine is provided with a cooling water suction pipe and a cooling water discharge pipe of the cooling water pipes, and is provided with a thermostat interposed between these cooling water suction pipes and the cooling water discharge pipe.

The cooling water suction pipe introduces the cooling water from the radiator into the water pump at one end in the crankshaft center line direction of the engine.

The cooling water discharge pipe returns the cooling water collected at the other end in the crankshaft center line direction via each cylinder bank to the radiator.

Moreover, about the cooling system fixing structure of an engine, there exist some disclosed by Unexamined-Japanese-Patent No. 61-97541. The timing belt device of the engine disclosed in this publication arranges a noise member in a timing belt cover covering a timing belt.

There is also a one disclosed in Japanese Patent Application Laid-Open No. 61-108846. The timing belt sound reduction device for a vehicle engine disclosed in this publication arranges a sound insulating wall that divides a belt cover into a portion where a drive pulley, an auxiliary drive pulley and a tensioner are arranged, and a portion where a camplier is arranged.

[Problem to Solve]

By the way, in the cooling system structure of the conventional engine, as shown in FIG. 3, the water pump 118 'is provided in the end surface of the cylinder block 104' in the timing chain cover 120 '. This water pump 118 'is driven by the rotation of the water pump shaft 136' to which the water pump pulley 148 'is fixed.

A cooling fan 142 'is directly connected to the water pump shaft 136'.

As a result, between the cooling fan shaft 144 'and the timing chain cover 120' to seal the inside and the outside of the timing chain cover 120 'between the water pump 118' and the cooling fan 142 '. There is an unreasonable reason that the sealing member 164 'must be interposed, thus increasing the number of parts and complicating the cooling system structure of the engine 102'.

In the case of the tandem engine, since the arrangement position of the cooling fan is determined by the placement position of the water pump, the overall length of the engine is increased, and the engine may be enlarged, and from the water pump bearing to the cooling fan. According to the distance of the water pump bearings a great burden is caused to reduce the service life of the water pump bearings.

In the conventional cooling system fixing structure of the engine, when the general cooling fan is laid out, the engine 202 'is formed by fastening bolts (not shown) of the timing chain cover 218' as shown in FIG. The cooling fan 216 'is fixed to the wall.

At this time, the fastening bolt is disposed in the fastening bolt hole portion 220 'formed along the outer circumferential surface portion of the timing chain cover 218', but may have only the fastening force required to fasten the timing chain cover 218 '. For example, the thing about 6 mm in diameter is used.

As a result, when the thickness of the timing chain cover is reduced in order to reduce the weight of the engine, the fastening bolts are generally not provided with sufficient fastening force for actively supporting the cooling fan, and thus can withstand the load on the fixed part of the cooling fan. There is a fear that the rotation shaft of the cooling fan is swinging or the timing chain cover can be traversed, cannot contribute to the weight reduction of the engine, and is unreasonable in practical use.

[Means for solving the problem]

Thus, the present invention is directed to a cooling system structure of an engine having a water pump installed at an end surface of a cylinder block in a timing chain cover attached to one end of the engine and a cooling fan arranged outside the timing chain cover to eliminate the above-mentioned irrational points. And a water pump first bearing for supporting the water pump shaft of the water pump on the water pump cover, and a second fan for the cooling fan shaft supporting the cooling fan shaft on the timing chain cover for the first bearing. A bearing is installed, and the timing chain cover is arranged so as to offset the center of the second bearing with respect to the center of the first bearing.

In addition, the present invention provides a engine having a cooling fan on one side and a timing chain cover covering a timing chain for driving the cooling fan, wherein the plurality of fixing bolt holes dedicated to the cooling fan are provided in the timing chain cover. And forming the fixing bolt hole portion closer to the center of the rotating shaft of the cooling fan.

[Action]

When the water pump and the cooling fan are arranged in the above manner, the water pump shaft is axially supported by the first bearing to the water pump cover in the timing chain cover, and the cooling fan shaft is connected to the timing chain cover through the second bearing. It is axially supported.

At this time, the center of a 2nd bearing is offset and arrange | positioned with respect to the center of a 1st bearing.

In addition, when the timing chain cover is mounted on one side of the engine, the tightening bolt is disposed at the fastening bolt hole of the timing chain cover, and the fastening bolt is disposed at the fastening bolt hole. It is mounted on one side of the head), and the fixing bolt securely supports the rotating shaft of the cooling fan to prevent the unreasonable fluctuation of the rotating shaft and contributes to the weight reduction of the engine since there is no fear that the timing chain cover will be broken.

EXAMPLE

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

1 and 2 show a first embodiment of this invention. In FIG. 2, 102 is a V-type engine and 104 is a cylinder block. The V-type engine 102 includes first and second cylinder heads 106-1 and 106-2 and first and second cylinder head covers 108-1 and 108-2 on the upper portion of the substantially V-shaped cylinder block 104. ), The first and second cylinder banks 110-1 and 110-2 are arranged in a substantially V-shape.

The oil pan 112 is attached to the lower portion of the cylinder block 104. The V engine 112 forms a space 114 between the first and second cylinder banks 110-1 and 110-2 arranged in a substantially V-shape.

An intake manifold (not shown) is arranged in this space 114.

The crankshaft 116 is disposed in the lower portion of the cylinder block 104, and the water pump 118 is disposed in the upper portion of the cylinder block 104. One end portion of the crankshaft 116 is exposed to the outside from the insertion through hole 122 for the crankshaft of the timing chain cover 120 attached to one end surface of the cylinder block 104, which is one end surface of the V-shaped engine. It is.

An inner pulley 124 is fixedly installed between the timing chain cover 120 of the crankshaft 116 and the cylinder block 104, and an outer pulley at an outer portion of the timing chain cover 120 of the crankshaft 116. 126 is fixed.

The inner pulley 124 has an oil pump driving gear 128 and a timing chain gear 130 integrally formed, and the outer pulley 126 has a first and second auxiliary drive pulley ( 132 and 134 are integrally formed.

In addition, the water pump shaft 136 of the water pump 118 is provided with a first bearing 140 for the water pump for supporting the water pump cover 138 and separately from the first bearing 140. A second bearing 146 for a cooling fan that supports the cooling fan shaft 144 of the cooling fan 144 to the timing chain cover 120 is provided, and the first bearing 140 is mounted on the timing chain cover 120. The center B of the second bearing 146 is disposed to be offset with respect to the center A of.

In detail, the water pump shaft 136 of the water pump 118 is axially supported by the first bearing 140 on the water pump cover 138 attached to the timing chain cover 120.

On the water pump shaft 136, a water pump pulley 148 is disposed in the same plane as the gear chain 130 for the timing chain of the inner pulley 124.

A timing chain (not shown) spans the water pump pulley 148 and the timing chain gear 130.

In addition, the cooling fan 142 of the timing chain cover 120 to offset the center B of the second bearing 146 by a distance L with respect to the center A of the first bearing 140. The projecting part of the projecting part is projected outwardly (left of Fig. 1), and the attachment hole part 150 for cooling fan is provided in this projecting part.

The cooling fan shaft 144 is axially supported by the attachment hole 150 through the second bearing 146. The cooling fan pulley 152 is disposed on the same plane as the first auxiliary drive pulley 132 of the outer pulley 126 on the shaft 144 of the cooling fan.

The cooling fan pulley 152 and the first auxiliary drive drive pulley 132 are wound around the first belt 154 for assisting device composition.

Reference numeral 156 denotes a second belt for driving the brace.

Next, the operation will be described.

When arranging the water pump 118 and the cooling fan 142, the water pump shaft 136 is axially supported on the water pump cover 138 in the timing chain cover 120 through the first bearing 140 and the cooling fan shaft 144 is axially supported by the timing chain cover 120 via a second bearing 146.

At this time, the center B of the second bearing 146 is arranged to be offset by the distance L with respect to the center A of the first bearing 140.

When the V-type engine 102 is driven, the driving force of the crankshaft 116 is transmitted to the water pump 118 through a timing chain (not shown), and the crankshaft 116 is provided to the cooling fan 142. The driving force of is transmitted through the first belt 154.

Thereby, the cooling fan 142 can be arrange | positioned regardless of the placement place of the water pump 118, the freedom degree of the arrangement position of this cooling fan 142 can be improved, and the overall length of the V-type engine 102 is It can shorten and it is advantageous in practical use.

In addition, by providing the first and second bearings 140 and 146 separately, the service life of the first bearing 140 can be extended compared to the conventional one, and the cost reduction of the cooling system structure of the V-type engine 102 can be achieved. Contribute to.

The present invention is not limited to the first embodiment, and various applications and modifications are possible. For example, in the first embodiment, the first and second bearings supporting the water pump and the cooling fan of the V-type engine are separately provided. However, other engines, such as in-line engines, are provided separately. It is also possible to separately install the 1st, 2nd bearing which supports a water pump and a cooling fan. As a result, the arrangement position of the cooling fan can be determined in consideration of the inclination of the in-line engine, and the water pump cover can be made compact, which is advantageous in practical use.

Hereinafter, a second embodiment of the present invention will be described in detail.

4 to 6 show a second embodiment of the present invention.

In FIG. 4, 202 is an engine and 204 is a cylinder block.

The engine 202 has first and second cylinder heads 206-1 and 206-2 and first and second cylinder head covers 208-1 and 208, respectively, above the V-shaped cylinder block 204. -2), the first and second cylinder banks 210-1 and 210-2 are arranged in a substantially V-shape. The oil pan 212 is attached to the lower portion of the cylinder block 204.

The engine 202 forms a space 214 between the first and second cylinder banks 210-1 and 210-2 arranged in a substantially V-shape. In this space portion 214, an intake manifold not shown is arranged.

The engine 202 is located on one side in front of the cylinder block 204, which is one end in the crankshaft center line direction of the engine 202, to place a timing chain (not shown), and the cooling fan ( 216 is driven and the timing chain is covered with the timing chain cover 218.

In addition, a plurality of fastening bolt holes 220 are formed at outer peripheral surface portions of the timing chain cover 218.

In addition, a plurality of fixing bolt hole portions 222 dedicated to the cooling fan 216 are provided in the timing chain cover 218, and the formation portions of the fixing bolt hole portions 222 are formed by rotating shafts of the cooling fan 216 ( 224) close to the center.

In detail, the fixing bolt hole part 222 is formed in three places, for example, one place in the upper part of the rotating shaft 224 and two places in the lower part of the rotating shaft 224 and in the left and right parts, respectively.

In this case, the fixing bolt hole 222 is configured to be close to the center of the rotation shaft 224.

That is, as shown in FIG. 5, three fixing bolt hole portions 222 are arranged so as to be located within the pole force distance L with respect to the diameter portion of the cooling fan 216.

Alternatively, the rotation shaft 224 may be arranged inside the triangular portion formed by the three fixing bolt hole portions 222.

In addition, the fixing bolt 226 disposed in the fixing bolt hole 222 is larger in diameter and longer than the fastening bolt (not shown) disposed in the fastening bolt hole 220, and the cooling fan 216 It is set as the structure which adds sufficient support force to support the rotating shaft 224 of ().

Next, the operation will be described.

When the timing chain cover 218 is mounted on one side of the engine 202, a fixing bolt hole part 222 is disposed while a fastening bolt (not shown) is disposed in the fastening bolt hole part 220 of the timing chain cover 218. Place the fixing bolt 226).

The timing chain turbine 218 is mounted to one side of the engine 202 by a fastening bolt (not shown), and the rotating shaft 224 of the cooling fan 216 is supported by the fixing bolt 226.

As a result, even if the thickness of the timing chain cover 218 is thinned, the fixing bolt 226 can reliably support the rotating shaft 224 of the cooling fan 216, and can prevent the unreasonable point of the rotating shaft swinging. There is no fear that the timing chain cover will be damaged, which can contribute to weight reduction of the engine and is advantageous in practical use.

In addition, since only the fixed bolt hole 222 is formed in the timing chain cover 218, the configuration is not complicated, it is easy to manufacture, the cost can be kept low, and economically advantageous.

[Effect of design]

As described in detail above, according to the present invention, the water pump shaft of the water pump is axially supported on the water pump cover, and the cooling fan shaft is axially supported on the timing chain cover separately from the first bearing. The second bearing for the cooling fan is installed, and the timing chain cover is arranged to offset the center of the second bearing with respect to the center of the first bearing, so that the cooling fan can be arranged regardless of the location of the water pump. It is advantageous in practical use because it is possible to improve the degree of freedom of the fan placement position and to shorten the overall length of the engine.

By providing the first and second bearings separately, the service life of the first bearing can be extended compared to the conventional one, contributing to cost reduction of the engine cooling system structure.

In addition, a plurality of fixing bolt holes dedicated to the cooling fan are provided in the timing chain cover mounted on one side of the engine, and the formation portion of the fixing bolt holes is formed to be close to the center of the rotation shaft of the cooling fan. Even if it is thin, it can securely support the rotating shaft of the cooling fan with the fixing bolt, prevent the unreasonable point of the rotating shaft, there is no fear that the timing chain cover will be broken, and it can contribute to the weight reduction of the engine and is advantageous in practical use.

In addition, since only the fixed bolt hole is formed in the timing chain cover, the configuration is not complicated, it is easy to manufacture, and the cost can be maintained at low cost, which is economically advantageous.

Claims (2)

In a cooling system structure of an engine having a water pump installed at an end surface of a cylinder block in a timing chain cover attached to one end of an engine and a cooling fan disposed outside the timing chain cover, the water pump shaft of the water pump is disposed on the water pump cover. A first bearing for supporting a water pump is provided, and a second bearing for a cooling fan for axially supporting a cooling fan shaft in a timing chain cover is provided separately for the first bearing, and the first chain is installed in the timing chain cover. An engine cooling system structure, wherein the center of the second bearing is arranged so as to be offset from the center of the bearing. In an engine having a cooling fan on one side and a timing chain cover covering a timing chain for driving the cooling fan, the timing chain cover is provided with a plurality of fixing bolt holes dedicated to the cooling fan, and is fixed. The formation system of the bolt hole is configured to be close to the center of the rotation shaft of the cooling fan, the cooling system fixed structure of the engine.