JPH058372Y2 - - Google Patents

Description

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

[Conventional technology]

Engines are equipped with something called a timing belt idler.

A timing belt idler is used to guide the timing belt that drives the camshaft. The timing belt idler includes an idler pulley that rotates in contact with the timing belt, and a support member that rotatably supports the idler pulley. The support member is a cooling water discharge member for guiding engine cooling water to the radiator.

As a prior art document disclosing a timing belt idler, for example, the present applicant published a document published in August 1985.
Utility Application No. 130564 filed on the 26th (Sho 62)
-37659).

FIG. 5 is a cross-sectional view of a conventional timing belt idler.

In FIG. 5, arrow F indicates the front of the engine, and arrow U indicates upward. Further, 1 is a first timing belt cover, and 22 is a second timing belt cover. The timing belt 2 is arranged in a space 25 formed by the first timing belt cover 1 and the second timing belt cover 22. 84 is a cooling fan.

In FIG. 5, 23 is an intake manifold, 24
is a cooling water discharge member. The cooling water discharge member 24 is attached to the intake manifold 23. The cooling water discharge member 24 is for feeding cooling water in the engine to a radiator (not shown), and a feeding duct member 81 connected to the radiator is attached to the tip 29 of the cooling water discharge member 24 via a rubber hose 82. There is. Reference numeral 83 denotes a clip that presses the rubber hose 82 against the supply duct member 81 and the cooling water discharge member 24. Arrow W represents the flow of cooling water.

An idler pulley 1 is installed on the cooling water discharge member 24.
5 is attached. The timing belt 2 is in contact with the idler pulley 15.

The idler pulley 15 is installed on the cooling water discharge member 24.
This is to cool the timing belt 2 and the timing belt 2 with engine cooling water.

The cooling water discharge member 24 and the idler pulley 15 are a subassembly and are called a timing belt idler.

6 is an exploded perspective view of the timing belt idler of FIG. 5. FIG.

In FIG. 6, arrow F indicates the front of the automobile, and arrow U indicates upward. Also, in Figure 6,
24 is a cooling water discharge member, 15 is an idler pulley,
82 is a rubber hose, and 81 is a feeding duct member.

As can be seen from FIG. 6, the feeding duct member 81
is an annular first part that comes into contact with the cooling water discharge member 24.
an annular portion 86 and a rectangular portion 87 having a rectangular cross-sectional shape.
and an annular second annular portion 88 to which a hose (not shown) connected to a radiator (not shown) is attached. The axis of the first annular portion 86 is coaxial with the axis of the cooling water discharge member 24.

[Problem that the invention attempts to solve]

The conventional timing belt idler shown in FIGS. 5 and 6 has the following two problems.

First, in addition to the feed duct member 81, a rubber hose 82 for connecting the cooling water discharge member 24 and the feed duct member 81 and a clip 83 for fastening it are required, which increases the cost accordingly. There was a problem:

Second, as can be seen from FIG. 6, the shape of the feeding duct member 81 changes from circular to rectangular and then returns to circular, which causes a problem in that the flow resistance of the cooling water increases.

The reason why the shape of the feeding duct member 81 is changed from circular to rectangular and then back to circular is as follows. That is, as can be seen from FIG. 5, a cooling fan 84 is provided in front of the first timing belt cover 1.
Therefore, if the feed duct member 81 were made of a bent circular pipe, the feed duct member 81 would come into contact with the cooling fan 84 due to the presence of the bent portion. However, as shown in FIG. 6, the feeding duct member 81 is divided into a first annular portion 86 that contacts the cooling water discharge member 24, a rectangular portion 87 having a rectangular cross section, and a radiator ( An annular second annular portion 88 to which a hose (not shown) connected to a hose (not shown) is attached.
This is because the distance to the cooling fan 84 can be shortened, and the feeding duct member 81 will not come into contact with the cooling fan 84.

The present invention solves the two problems mentioned above.

The technical problem of the present invention is to reduce the cost of the cooling water passage structure, reduce the resistance of the cooling water passage, and make the engine compact.

[Means for solving problems]

In order to achieve this technical problem, the following measures are taken in the present invention.

That is, in the cooling water passage structure of the present invention, in order to send cooling water from the engine to the radiator, a cooling water discharge member that discharges cooling water from the engine penetrates inside a timing belt cover that covers a timing belt that drives a camshaft, etc., in the longitudinal direction of the engine and extends to the outside of the timing belt cover, and the cooling water discharge member inside the timing belt cover journals an idler pulley that abuts against the timing belt cover, and the end of the cooling water discharge member that protrudes to the outside of the timing belt cover opens toward the top of the engine and is connected to a cooling water passage to the radiator.

[Effect]

In the present invention, the feed duct member is attached directly to the cooling water discharge member, and when the feed duct member is attached to the combustion cooling water discharge member, the axis of the cooling water discharge member and the feed duct member It is approximately perpendicular to the axis of Therefore, even if the effective flow passage cross-sectional area of the feed duct member is increased, it will not interfere with the cooling fan.

In the present invention, since the effective cross-sectional area of the feed duct member can be increased, there is no need to change the shape of the feed duct member from a circle to a rectangle and then back to a circle. Therefore, the flow resistance of cooling water increases.
There is no problem.

In addition, in the present invention, the feeding duct member is directly attached to the cooling water discharge member, and therefore, in addition to the feeding duct member, there is a rubber hose for connecting the cooling water discharge member and the feeding duct member. Since a clip (see FIG. 5) for fastening is not required, costs can be reduced accordingly.

〔Example〕

FIG. 1 is a longitudinal sectional view of a timing belt idler according to an embodiment of the present invention.

In FIG. 1, arrow F indicates the front of the engine, and arrow U indicates upward. Further, 1 is a first timing belt cover, and 22 is a second timing belt cover. The first timing belt cover 1 and the second timing belt cover 22 constitute a timing belt storage chamber 25, and the timing belt 2 is disposed within the timing belt storage chamber 25.

In FIG. 1, 84 is a cooling fan. The cooling fan 84 is for introducing air into a radiator (not shown) to cool the radiator. A radiator is arranged in front of the cooling fan 84 (in the direction of arrow F).

FIG. 1 is a cross-sectional view of FIG. 3. Third
1 is a front view of an engine equipped with a timing belt idler according to an embodiment of the present invention.
The explanation will start from FIG.

As can be seen from the figure, the engine in Figure 3 has V
It is a type engine. 71 is an intake passage for guiding intake air to the engine, and 72 is a surge tank. Further, 23 is an intake manifold. Intake air is drawn into the engine from the intake passage 71 via the surge tank 72 and the intake manifold 23. The intake manifold 23 is fixed to the cylinder head 14.

In FIG. 3, 1 is a first timing belt cover. Although not shown in FIG. 3 since it is a front view, there is a second timing belt cover shown in FIG. 1 behind the first timing belt cover 1 (reference numeral 2 in FIG. 1).
2), the first timing belt cover 1 is attached to the second timing belt cover. A second timing belt cover is secured to the cylinder head 14 of the engine.

The first timing belt cover 1 and the second timing belt cover form the above-mentioned timing belt storage chamber (not shown), and the timing belt 2 is inside the timing belt storage chamber.
is stored. When the engine is viewed from the front, the timing belt 2 is covered with a first timing belt cover 1.

Timing belt 2 is connected to camshaft pulley 1
1, 12 and the crankshaft pulley 13, and the camshaft pulley 11, 12
15, 16, and 17 are idler pulleys.

Returning to FIG. 1, as can be seen from the figure, the peripheral edge of the first timing belt cover 1 and the peripheral edge of the second timing belt cover 22 are connected, so that the first timing belt cover 1 and the second timing belt cover 1 are connected to each other.
A timing belt storage chamber 25 in which the timing belt 2 is stored is formed with the timing belt cover 22 . A gasket 9 is interposed at the joint between the first timing belt cover 1 and the second timing belt cover 22 for sealing.

In FIG. 1, 23 is an intake manifold, 24
is a cooling water discharge member. The cooling water discharge member 24 is attached to the intake manifold 23. The cooling water discharge member 24 is for supplying cooling water in the engine to a radiator (not shown).

4 is a perspective view of the intake manifold of FIG. 1; FIG.

In FIG. 4, arrow F indicates the front of the engine, and arrow U indicates upward. Further, 23 indicates the entire intake manifold. Reference numeral 43 indicates intake passages, and although only two are shown in the figure, there are actually as many intake passages as there are cylinders of the engine. Fourth
Since the engine to which the illustrated intake manifold 23 is attached is a V-type engine, as shown in FIG. 3, the intake passages 43 alternately communicate with the right bank and the left bank from the front.

A flange portion 40 is provided at the front of the intake manifold 23.
A cooling water outlet 44 is provided in the flange portion 40 . A cooling water discharge member (numeral 24 in FIG. 1) is attached to the flange portion 40. 45 is a bolt hole through which a bolt (not shown) for fixing the cooling water discharge member is passed. Arrow W represents cooling water coming out from the cooling water outlet 44.

Returning to FIG. 1, the first timing belt cover 1 and the second timing belt cover 22 have through holes 18 and 30 whose axes are oriented in a substantially horizontal direction.
is drilled. The cooling water discharge member 24 is a second
The first timing belt cover 1 passes through the through hole 30 of the first timing belt cover 22 and the through hole 18 of the first timing belt cover 1 and extends toward the front of the engine. 19 is a gasket for sealing.

An idler pulley 1 is installed on the cooling water discharge member 24.
5 (see Figure 2) is attached. The idler pulley 15 includes a hub portion 51 that is press-fitted into the cooling water discharge member 24 and a rotating portion 55 that is rotatably attached to the hub portion 51 via a ball bearing 52. The timing belt 2 is in contact with the rotating part 55.

The idler pulley 15 is installed on the cooling water discharge member 24.
This is for cooling the timing belt 2 with engine cooling water. The cooling water discharge member 24 and the idler pulley 15 are a subassembly and are called a timing belt idler.

In FIG. 1, the tip 2 of the cooling water discharge member 24
A feed duct member 91 is attached to 9 to which a hose connected to the radiator is attached. That is, a cooling water discharge member side flange 92 is provided at the tip 29 of the cooling water discharge member 24 . The cooling water discharge member side flange 92 is provided so that the opening 93 of the cooling water discharge member 24 faces upward.

The feeding duct member 91 is also provided with a feeding duct member side flange 95. The feed duct member side flange 95 is connected to the cooling water discharge member side flange 92 with bolts (not shown), and the feed duct member 9
2 is attached to a cooling water discharge member 24.
The feed duct member 92 extends to the other side of the paper at a substantially right angle to the paper. Therefore, the feeding duct member 92
The axis of the cooling water discharge member 24 is approximately perpendicular to the axis of the cooling water discharge member 24. Arrow W represents the flow of cooling water.

FIG. 2 is an exploded perspective view of a timing belt idler according to an embodiment of the present invention.

In FIG. 2, 91 is a feeding duct member, 24
1 is a cooling water discharge member, and 15 is an idler pulley. Further, 92 is a cooling water discharge member side flange, 9
5 is a flange on the side of the feeding duct member, and 93 is an opening. Numeral 94 is a bolt hole through which a bolt (not shown) for fixing the feed duct member 91 to the cooling water discharge member 24 is passed.

As can be seen from Fig. 2, the cooling water discharge member 2
When the feeding duct member 91 is attached to 4,
The axis PP of the cooling water discharge member 24 and the axis Q-Q of the feed duct member 91 are substantially perpendicular to each other.

The operation of this embodiment will be explained.

In this embodiment, as shown in FIG.
1 is attached, and the cooling water discharge member 2
When the feed duct member 91 is attached to the cooling water discharge member 24, the axis of the cooling water discharge member 24 and the axis of the feed duct member 91 are substantially perpendicular. Therefore, even if the effective flow passage cross-sectional area of the feed duct member 91 is increased, it will not interfere with the cooling fan 84.

In this embodiment, the effective flow passage cross-sectional area of the feed duct member 91 is large, and the shape of the feed duct member 81 does not change from a circle to a rectangle and then return to a circle, so that the flow resistance of the cooling water is reduced. growing,
There is no problem.

Further, in this embodiment, the feeding duct member 91 is directly attached to the cooling water discharging member 24, and therefore, the cooling water discharging member 24 and the feeding duct member 91 are connected to each other in addition to the feeding duct member 91. Since there is no need for a rubber hose to hold it in place or a clip to hold it (see Figure 5), costs can be reduced accordingly.

Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various embodiments are encompassed within the scope of the claims.

[Effect of idea]

According to the present invention, it is possible to reduce the cost of the timing belt idler and to reduce the flow resistance of the cooling water.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view (-cross-sectional view of FIG. 3) of a timing belt idler according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a timing belt idler according to an embodiment of the present invention. , FIG. 3 is a front view of an engine equipped with a timing belt idler according to an embodiment of the present invention, and FIG.
FIG. 5 is a longitudinal sectional view of a conventional timing belt idler, and FIG. 6 is an exploded perspective view of the conventional timing belt idler. 1...First timing belt cover, 2...
Timing belt, 14...Cylinder head, 1
5... Idler pulley, 18... Through hole of first timing belt cover, 22... Second timing belt cover, 23... Intake manifold, 2
4... Cooling water discharge member, 25... Timing belt storage chamber, 29... Tip portion of the cooling water discharge member,
30...Through hole of second timing belt cover, 91...Feeding duct member, 92...Cooling water discharge member side flange, 93...Opening, 95...Feeding duct member side flange.

Claims (1)

[Scope of utility model registration request] To send cooling water from the engine to the radiator,
A cooling water discharge member that discharges cooling water from the engine passes through the timing belt cover that covers the timing belt that drives the camshaft etc. in the longitudinal direction of the engine, and extends to the outside of the timing belt cover. The cooling water discharge member has a cooling water passage structure in which an idler pulley that is in contact with the timing belt is pivotally supported, and an end of the cooling water discharge member that protrudes outside the timing belt cover is opened upwardly of the engine. A cooling water passage structure characterized by having holes and being connected to a cooling water passage to a radiator.