JPH0617893A - Chain guide for engine - Google Patents

Abstract

PURPOSE:To attain the effective use of space and allow a chain to be guided positively while preventing the generation of oscillation and noise caused by the chain so as not to become the vibration origin by disposing a chain guide for guiding the chain, utilizing the fitting bolt of a water pump. CONSTITUTION:At the time of fitting a water pump 76 to an engine 2 by a fitting bolt 78, a second chain guide 80 for guiding a first chain 62 is disposed utilizing the fitting bolt 78 of the water pump 76. A space for the fitting bolt of the second chain guide 80 is thereby dispensed with so as to attain the effective use of space. As a result, oscillation and noise generated to the chain can be positively prevented and becoming the vibration origin can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine chain guide, and more particularly, when the rotational force of the crank shaft is transmitted to the cam shaft by the chain wound around the crank shaft and the cam shaft, vibration and noise of the chain are generated. The present invention relates to an engine chain guide arranged to avoid the above.

[0002]

2. Description of the Related Art As an engine of a vehicle, there are an engine having cylinders arranged in series, an engine having cylinders opposed to each other, an engine having cylinders arranged in a V shape, and the like. The engine in which the cylinders are arranged in a V-shape has one side of the V-shaped cylinder block and the other side of the cylinder bank.
One side cylinder head and the other side cylinder head are mounted.
In such an engine, one side first and second cam shafts for intake and exhaust are pivotally supported on one side of the cylinder head, and two intake and exhaust sides are provided for the other side cylinder head, respectively. The other side first and second cam shafts are rotatably supported, and the rotation of the crank shaft rotatably supported by the cylinder block is transmitted through the intermediate shaft to the timing chain and one side, and the other side cam chain to the one side first, Some drive by transmitting to the second cam shaft and the other side first and second cam shafts.

As the chain guide for the engine, there is one disclosed in Japanese Utility Model Laid-Open No. 2-132811.
A water pump case structure for an engine disclosed in this publication is a timing belt that forms a timing belt chamber between a cylinder block and a cylinder head and a front surface of the cylinder block and the cylinder head. A rib that includes a cover and a bearing portion boss of the water pump attached to the cylinder block, and that protrudes radially outward of the bearing portion boss of the water pump so as to substantially surround the bearing portion boss via a predetermined space. Is formed, and an opening is formed in the timing belt cover so that the edge corresponds to the rib, and the edge of this opening is brought into contact with the sealing surface of the tip of the rib via the seal member, and the bearing of the water pump is formed. At least a part of the partial boss is located at the same axial position as the timing belt chamber.

As an engine chain transmission device, there is one shown in FIG. In FIG. 5, 102 is an engine. The engine 102 includes two V-shaped cylinder blocks 104 on one side and the other side cylinder banks 106 and 108, respectively.
0, 112 are mounted, and the one side and the other side head covers 114, 11 are mounted on the one side and the other side cylinder heads 110, 112.
6 is attached. A bearing cap 118 is attached to the lower portion of the cylinder block 104 of the engine 102, and an oil pan (not shown) is attached. Reference numeral 120 is an oil pump.

The engine 102 includes a cylinder block 10
4, a crank sprocket 124 is attached to one end of the crank shaft 122 axially supported by the bearing cap 118 in the axial direction. The one side cylinder head 11
0 and the cylinder head 112 on the other side have a first side on one side,
The second cam shafts 126 and 128 and the other side first and second cam shafts 13
0 and 132 are provided so as to be axially supported. The one-side first and second cam shafts 126 and 128 are respectively provided with one-side first and second cam sprockets 134 and 136 at the other ends in the axial direction. The other-side first and second cam shafts 130 and 132 have the other-side first and second cam sprockets 13 respectively at one end in the axial direction.
8 and 140 are attached.

The one side first and second cam shafts 126 and 128
On the other hand, in the figure, a one-side first sprocket 142 having a diameter larger than that of the crank sprocket 124 is attached to the one-side first cam shaft 126 for intake air at one end side in the axial direction. The other side cylinder head 112 is provided with the other side idler shaft 144 attached to one end side in the axial direction by a bolt 146. This other side idler shaft 14
4, an intermediate idler 150 on the other side is pivotally supported. The other side intermediate idler 150 includes an other side intermediate sprocket 152 and another side cam sprocket 154. The other side intermediate sprocket 152 and the other side cam sprocket 154 are integrally provided.

The cylinder block 104 has one side,
The idle shaft 156 is mounted between the other side cylinder banks 106 and 108, and is attached to one end side in the axial direction by an idle shaft mounting bolt 158. This idle shaft 156
Has an idle sprocket 160 axially supported therein.

A first chain 162, which is a timing chain, is wound around the crank sprocket 124, the one-side intermediate sprocket 142, the other-side intermediate sprocket 152, and the idle sprocket 160. A second chain 164, which is a one side cam chain, is wound around the one side first and second cam sprockets 134 and 136. The other side first and second cam sprockets 138, 14
The third chain 166, which is the other side cam chain, is wound around the 0 and the other side cam sprocket 154.

The first chain 162 is provided with a timing tensioner 168 that applies a constant tension. The second chain 164 and the third chain 166 are provided with a one-side cam chain tensioner 170 and another-side cam chain tensioner 172 that give a constant tension. Note that reference numeral 1
74 is a chain guide for guiding the first chain 162, 17
6 is a water pump.

[0010]

By the way, in the conventional engine chain guide, when the water pump is arranged at the central portion of the bank of the V-type engine, the first chain, which is the timing chain, is provided in the vicinity of the water pump. It is arranged.

Then, in order to prevent vibration and noise generated in the first chain, and to avoid becoming a vibration source,
A chain guide for guiding the chain is provided.

However, when disposing the chain guide, there is not enough space for disposing the chain guide and the mounting bolt at the portion A in FIG. 5 and it is necessary to dispose the chain guide at a position separated from the portion A. There is.

As a result, there is a disadvantage in that the space cannot be effectively used, which is disadvantageous in practical use.

Further, it is desirable to dispose the chain guides in more places of the first chain, but it is also necessary to dispose the timing tensioner, which means that the places where the chain guides are arranged are limited, and the chain guide is limited. Since there are few places where guides are provided and there is a possibility that the first chain cannot be reliably guided, runout or noise occurs in the first chain,
There is a fear of becoming a vibration source, and it is inconvenient to use.

[0015]

SUMMARY OF THE INVENTION Therefore, in order to eliminate the above-mentioned inconvenience, the present invention relates to an engine in which the rotational force of a crankshaft is transmitted to a camshaft via a chain, and a water pump is attached to the engine by a mounting bolt. It is characterized in that a chain guide for guiding the chain is provided by using a mounting bolt of a water pump at the time of mounting.

[0016]

According to the invention as described above, when the water pump is mounted on the engine by the mounting bolts, the chain guide is also arranged by using the mounting bolts of the water pump to effectively utilize the space and to secure the chain. It is possible to reliably guide and prevent the vibration and noise from being generated by the chain, and also avoid the source of vibration.

[0017]

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

1 to 4 show an embodiment of the present invention. In FIG. 2, reference numeral 2 is an engine. In this engine 2, one side and the other side cylinder heads 10 and 12 are mounted on two one side and the other side cylinder banks 6 and 8 of a V-shaped cylinder block 4, respectively. 10, 12, one side head cover 14, the other side head cover 14,
16 is attached. A bearing cap 18 is attached to the lower portion of the cylinder block 4 of the engine 2, and an oil pan (not shown) is attached. Reference numeral 20 is an oil pump.

In this engine 2, a crank sprocket 24 is attached to one end side in the axial direction of a crank shaft 22 which is rotatably supported by a bearing cap 18 on a cylinder block 4. The one side cylinder head 10
The first and second cam shafts 26, 28 for intake and exhaust, and the first and second cam shafts 30, 32 for intake and exhaust are respectively provided on the other side and the other side cylinder head 12. It is rotatably supported. The one-side first and second cam shafts 26 and 28 have one-side first and second cam sprockets 3 respectively on the other end side in the axial direction.
4, 36 are attached. The other side first and second cam shafts 30 and 32 are provided with the other side first and second cam sprockets 38 and 40, respectively, at one end side in the axial direction.

One of the two first-side first and second cam shafts 26, 28 pivotally supported by the one-side cylinder head 10, and one end in the axial direction of the intake first-side first cam shaft 26 in the figure. One side intermediate sprocket 42 having a diameter larger than that of the crank sprocket 24 is attached to the side.

The other side first of the other side cylinder head 12,
A bolt fixing hole portion 48 for fixing a fixing stud bolt 46 that supports the idler shaft 44 on the other side is formed at an intermediate portion between the second cam shafts 30, 32 and the crank shaft 22 and one end side in the axial direction. The stud bolt 46 is fixed in the bolt fixing hole 48.

On the outer circumference of the other side idler shaft 44, the other side intermediate idler 50 is pivotally supported. The other side intermediate idler 50 is formed of another side intermediate sprocket 52 and another side cam sprocket 54.

Further, the cylinder block 4 is provided above the center between the one-side cylinder bank 6 and the other-side cylinder bank 8, and an idle shaft 56 is attached to one end side in the axial direction by an idle shaft mounting bolt 58. There is. An idle sprocket 60 is rotatably supported on the idle shaft 56.

A first chain 62, which is a timing chain, is wound around the crank sprocket 24, the one-side intermediate sprocket 42, the other-side intermediate idler 50, the other-side intermediate sprocket 52, and the idle sprocket 60. The one side first and second cam sprockets 34, 36
A second chain 64, which is a cam chain on one side, is wound around and provided. The other side first and second cam sprockets 38, 4
The third chain 66, which is the other side cam chain, is wound around the 0 and the other side cam sprocket 54.

The first chain 62 is provided with a timing tensioner 68 for applying a constant tension. The second
The chain 64 and the third chain 66 are provided with a one-side cam chain tensioner 70 and another-side cam chain tensioner 72 that apply a constant tension. Reference numeral 74 is a timing first chain guide for guiding the first chain 62, and 76.
Is a water pump.

Further, when the water pump 76 is mounted on the engine 2 by the mounting bolts 78, the mounting bolts 78 of the water pump 76 are utilized to make the first chain 6
A second chain guide 80, which is a chain guide for guiding the second guide 2, is provided.

More specifically, the first chain guides 74 are disposed above the water pump 76 at positions slightly separated from each other due to a small mounting space.

Then, the second chain guide 80 is disposed in the small mounting space above the water pump 76 by using the mounting bolt 78 of the water pump 76.

This second chain guide 80 is shown in FIGS.
As shown in FIG. 5, the first chain 62 is formed in an annular shape so as to be positioned in the recess 88 between the pin 82 and the bush 86 on the outer periphery of the link plate 84.

Then, the second chain guide 80 and the pin 82
With the above, the first chain 62 is prevented from swinging, and the second chain guide 80 and the bush 86 prevent the first chain 62 from contacting other components.

Next, the operation will be described.

When the engine 2 is driven, the rotational force of the crankshaft 22 causes the crank sprocket 24 fixed to the crankshaft 22 to rotate. The rotational force of the crank sprocket 24 is transmitted to the one side intermediate sprocket 42 and the other side intermediate idler 50 via the first chain 62.
Is transmitted to the other side intermediate sprocket 52.

The one side first sprocket 42 is fixed by the rotation of the one side intermediate sprocket 42.
While driving the cam shaft 26, the one side first cam sprocket 34 fixed to the one side first cam shaft 26 is rotated. The rotation of the one side first cam sprocket 34 is
The second cam sprocket 36 on one side through the second chain 64
And is transmitted to the one-side second cam shaft 28.

The rotation of the other side intermediate sprocket 52 causes the other side cam sprocket 54 integrally formed with the other side intermediate sprocket 52 to rotate. The rotation of the other-side cam sprocket 54 drives the other-side first and second cam shafts 30 and 32.

As a result, the first chain guide 74 can be disposed at a position slightly separated from the first chain 62, and the pin 82 in the small mounting space above the water pump 76 and the bush 86 on the outer periphery of the link plate 84.
The second chain guide 80 can be disposed in the recess 88 between them, so that the vibration and noise generated in the first chain 62 can be reliably prevented, and the source of vibration can be avoided.

Also, by disposing the second chain guide 80 by using the mounting bolt 78 of the water pump 76 in the small mounting space portion above the water pump 76, the space for the mounting bolt of the second chain guide 80. Is unnecessary, and effective use of space can be achieved,
It is practically advantageous.

Furthermore, since the structure of the second chain guide 80 is simple, it is easy to manufacture, the cost can be kept low, and it is economically advantageous.

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.

For example, in the embodiment of the present invention, the first chain guide is arranged at a position slightly separated from the first chain, and the second chain guide is arranged in a small mounting space portion above the water pump. However, even if only the second chain guide is provided without disposing the first chain guide, it is possible to surely prevent the shake and noise generated in the first chain, as in the above-described embodiment. It is possible to avoid becoming a vibration source.

[0040]

As described in detail above, according to the present invention, the mounting bolt of the water pump is used when mounting the water pump on the engine which transmits the rotational force of the crankshaft to the camshaft through the chain. Since the chain guide for guiding the chain is arranged, the chain guide can be arranged in a small mounting space near the water pump 7, and the shake and noise generated in the chain can be reliably prevented. It is possible to obtain the vibration and avoid the vibration. Further, by disposing the chain guide using the mounting bolts of the water pump in the vicinity of the water pump, the space for the mounting bolts of the chain guide becomes unnecessary, and the space can be effectively used, which is practically advantageous. is there. Furthermore, since the structure of the chain guide is simple, it is easy to manufacture, the cost can be kept low, and it is economically advantageous.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an engine showing an embodiment of the present invention.

FIG. 2 is a schematic enlarged view of a first chain which is a timing chain.

FIG. 3 is a schematic enlarged view of a pin, a link plate, and a bush that form the first chain.

FIG. 4 is a schematic view when a second chain guide is provided.

FIG. 5 is a schematic diagram of an engine showing a conventional technique of the present invention.

[Explanation of symbols]

 2 engine 4 cylinder block 12 other side cylinder head 16 other side head cover 22 crankshaft 24 crank sprocket 30 other side first camshaft 32 other side second camshaft 38 other side first cam sprocket 40 other side second cam sprocket 44 other Side idler shaft 56 Idle shaft 60 Idle sprocket 62 First chain 64 Second chain 66 Third chain 68 Timing tensioner 70 One side cam chain tensioner 72 Other side cam chain tensioner 74 First timing chain guide 76 Water pump 78 Mounting bolt 80 Second chain guide 82 Pin 84 Link plate 86 Bush 88 Recess

Claims (1)

[Claims] 1. An engine for transmitting a rotational force of a crankshaft to a camshaft via a chain, wherein when the water pump is mounted on the engine by a mounting bolt, the chain is guided by using the mounting bolt of the water pump. An engine chain guide characterized in that a guide is provided.