JPH0717793Y2 - Overhead camshaft type V engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an overhead camshaft type V engine.

[Conventional technology]

FIG. 6 is a front view of a conventional overhead camshaft type V engine. FIG. 6 is a view with the timing belt cover removed. As a prior art document disclosing an overhead camshaft type V engine, there is, for example, Japanese Utility Model Laid-Open Sho 60-70730.

In FIG. 6, 1 and 2 are camshaft pulleys, and 3 is a crankshaft pulley. A timing belt 11 is provided between the camshaft pulleys 1 and 2 and the crankshaft pulley 3.
Is wound, and the camshaft pulleys 1 and 2 are driven by the crankshaft pulley 3.

Reference numeral 4 is a tension idler pulley for adjusting the tension of the timing belt 11, and reference numeral 5 is a water pump pulley for driving a water pump (not shown). 6 is an idler pulley between cams.

The inter-cam idler pulley 6 is provided in FIG. 6 for the following reason.

If the idler pulley 6 between the cams is not provided and the timing belt 11 is wound between the camshaft pulleys 1 and 2 as shown by the broken line, the rotational fluctuation of the camshaft pulley 1 and the camshaft pulley 2 causes the engine to run, Timing belt
11 will flap up and down. Since the traveling direction of the timing belt 11 is the direction of arrow A, the timing belt 11
If there is flapping, the valve timing of the camshaft pulley 1 will be incorrect. Thus, the inter-cam idler pulley 6 is provided in order to prevent the timing belt 11 from flapping and prevent such problems from occurring.

In FIG. 6, reference numeral 12 is a cooling water connector. The cooling water connector 12 collects cooling water in the engine body and sends it to a radiator (not shown). The arrow B represents the flow of cooling water.

FIG. 7 is a sectional view taken along line VII-VII of FIG.

In FIG. 7, 6 is an inter-cam idler pulley, 5 is a water pump pulley, 3 is a crankshaft pulley, and 9 is a timing belt cover. The timing belt is omitted in FIG.

As can be seen from FIG. 7, in the conventional overhead camshaft type engine, the idler pulley 6 between cams was supported by the cooling water connector 12. The cooling water connector 12 is usually made integrally with the intake manifold 13.

In the conventional overhead camshaft type V engine as shown in FIG. 6 and FIG. 7, since the engine cooling water outlet also serves as an idler mounting member, the cooling water passage length to the radiator is shortened. On the other hand, as compared with the case where the inter-cam idler pulley 6 is directly attached to the cylinder block, the tightening error of the gasket is more likely to be accumulated, and the errors of the three parts themselves of the cylinder block, the cylinder head and the cooling water connector may be accumulated. Idler pulley 6 between cams for timing belt 11
There is a problem that an error is likely to occur in the alignment, that is, the mounting positional relationship. Further, since a force is applied to the cooling water connector 12, water leakage and air leakage may occur from the mounting surface between the cooling water connector 12 and the cylinder head. There was also the problem of being there.

For this reason, when the restriction on the length of the cooling water passage is small, the idler pulley 6 is attached to the cylinder block via a dedicated bracket, as described in the description of the prior art of Japanese Utility Model Laid-Open No. 60-70730. Was there.

[Problems to be solved by the device]

However, the restriction on the length of the cooling water passage is small, and even in the case where the idler pulley 6 is attached to the cylinder block via a dedicated bracket, the following problems remain.

That is, the piston striking sound, the intake sound, the combustion sound, etc. that reverberate in the cavity formed in the part surrounded by the banks on the left and right and the intake manifold 13 (and the cooling water connector 12) are surrounded by the idler pulley 6. Timing belt cover leaking from
Since 19 is vibrated from the outside or resonated with the timing belt cover 19, the timing belt cover 19 may amplify these noises and increase the noises.

The present invention solves such a problem, and a technical problem of the present invention is that a timing belt is formed from a cavity formed in a portion surrounded by left and right banks and an intake manifold (and a cooling water connector). It is to reduce noise by reducing the transmission of noise to the cover.

[Means for Solving the Problems]

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

That is, an inter-cam idler pulley is provided for tensioning the tension of the timing belt wound around the cam shaft pulleys on the left and right banks of the overhead cam shaft type V engine, and the inter-cam idler pulley is a pulley. The pulley support bracket is rotatably supported by a support bracket, and the pulley support bracket is fixed to a cylinder block between the left and right banks. The pulley support bracket is provided between the left and right banks for sending cooling water inside the engine body to a radiator. A cooling water connector is disposed integrally with the intake manifold, and a gap between the pulley support bracket and the cooling water connector, a gap between the pulley support bracket and the left and right cylinder heads, and the pulley support are provided. A seal member for filling the gap between the bracket and the cylinder block is Serial is characterized in that provided in the pulley support bracket.

[Action]

In the present invention, the cooling water connector is disposed integrally with the intake manifold, and the gap between the connector and the pulley support bracket, the gap between the left and right cylinders and the pulley support bracket, and the cylinder block are provided. Since the seal member for filling the gap with the pulley support bracket is provided, the gap between the cavity formed in the portion surrounded by the left and right cylinder blocks and the intake manifold (and the cooling water connector) and the timing belt cover is provided. All the gaps are closed by the sealing material, and the transmission of noise in the cavity to the timing belt cover is reduced.

〔Example〕

FIG. 1 is a front view of an overhead camshaft type V engine according to an embodiment of the present invention.

In FIG. 1, 23 is a cylinder block and 24 is an oil pan. Cylinder heads 24 and 25 are attached to the cylinder block 23, respectively. Cylinder head covers 26, 27 are attached to the cylinder heads 24, 25.

21 is a right bank and 22 is a left bank. The right bank 21 is composed of a cylinder head cover 26, a cylinder head 24 and a cylinder block 23, and the left back 22 is composed of a cylinder head cover 27, a cylinder head 25 and a cylinder block 23.

Reference numerals 1 and 2 are camshaft pulleys, and 3 is a crankshaft pulley. The camshaft pulleys 1 and 2 are fixed to the tip of a camshaft (not shown) that drives the intake and exhaust valves of the engine. The crankshaft pulley 3 is fixed to the tip of the crankshaft pulley 3 of the engine.

A timing belt 11 is wound around the camshaft pulleys 1 and 2 and the crankshaft pulley 3. Therefore, the camshaft pulleys 1 and 2 are driven by the crankshaft (not shown).

Reference numeral 4 is a tension idler pulley for adjusting the tension of the timing belt 11, and reference numeral 5 is a water pump pulley for driving a water pump (not shown). 6 is an idler pulley between cams. The inter-cam idler pulley 6 is provided for the reason described above.

Usually, the timing belt 11 is covered with a timing belt cover. FIG. 1 is a view with the timing belt cover removed.

In FIG. 1, reference numeral 12 is a cooling water connector. The cooling water connector 12 is composed of an upper cooling water connector member 31 and a lower cooling water connector member 32. Cooling water connector 12
Is for collecting the cooling water in the engine body and sending it to a radiator (not shown). The arrow B represents the flow of cooling water. Cooling water connector 12 is for the left and right banks
It is located between 21,22.

FIG. 2 is a sectional view taken along line II-II of FIG.

In FIG. 2, 6 is an idler pulley between cams, 5 is a water pump pulley, 3 is a crankshaft pulley, and 9 is a timing belt cover. The timing belt is omitted in FIG.

As described above, the cooling water connector 12 is composed of the upper cooling water connector member 31 and the lower cooling water connector member 32, but the lower cooling water connector member 32 is made integrally with the intake manifold 13. There is. A connection pipe 33 of a surge tank (not shown) is mounted on the intake manifold 13. Reference numeral 34 represents an air passage in the intake manifold 13, and 35 represents a cooling water passage in the cooling water connector 12.

As can be seen from FIG. 2, in the overhead camshaft type engine of this embodiment, the inter-cam idler pulley 6 is supported by the pulley support bracket 41. This is a feature of this embodiment.

The pulley support flange 41 includes a pulley support portion 52 and a pedestal portion 53 to which the inter-cam idler pulley 6 is rotatably attached.
It consists of and. The pulley support bracket 41 is arranged between the left and right banks 21 and 22 (see FIG. 1),
Cylinder block with bolts 42 at base 53
It is fixed at 23. The pedestal portion 53 includes the intake manifold 13
It is located below. The pulley support bracket 41 is positioned with respect to the cylinder block 23 by a knock pin (not shown). 43 is a bolt that rotatably attaches the idler pulley 6 between the cams.

FIG. 3 is a perspective view of the overhead camshaft type V engine of FIG. 1 with the oil pan, timing belt, pulley support bracket, pulley and the like removed.

In FIG. 3, 23 is a cylinder block, 24 and 25 are cylinder heads, and 26 and 27 are cylinder head covers. Also,
Reference numeral 13 is an intake manifold, and 12 is a cooling water connector.

As can be seen from FIG. 3, there is a cavity 45 below the intake manifold 13.

Returning to FIG. 2, a seal member 44 is interposed between the lower cooling water connector member 32 and the pulley support bracket 41. The seal member 44 is made of sponge, rubber or the like and is bonded to the pulley support bracket 41.

A seal member 44 made of sponge is also interposed between the pulley support bracket 41 and the cylinder block 23.

As can be seen from FIG. 1, a seal member 44 made of sponge, rubber or the like is also interposed between the pulley support bracket 41 and the cylinder heads 24, 25. Therefore, the front portion of the cavity 45 is completely closed by the seal member 44.

The rear portion of the cavity 45 is closed by a closing member (not shown). The front part and the rear part of the cavity 45 are closed for noise reduction.

FIG. 4 is a perspective view of the overhead camshaft type V engine of FIG.

In FIG. 4, the oil pan and the timing bearing cover are omitted.

In FIG. 4, 23 is a cylinder block, 24 and 25 are cylinder heads, and 26 and 27 are cylinder head covers. Also,
11 is a timing belt, 1 and 2 are camshaft pulleys, 3 is a crankshaft pulley, 4 is a tension idler pulley, and 5 is a water pump pulley. Further, 41 is a pulley support bracket, and 6 is an idler pulley between cams.

As can be seen from FIG. 4, the inter-cam idler pulley 6 is attached to the pulley support bracket 41, not to the cooling water connector 12 (see FIG. 3). The pedestal portion 53 of the pulley support bracket 41 is fixed to the cylinder block 23 with bolts 42.

FIG. 5 is a top view of an idler pulley between cams and a pulley support bracket.

In FIG. 5, 6 is an idler pulley between cams, and 41 is a pulley support bracket. The inter-cam idler pulley 6 is rotatably attached to the pulley support bracket 41 by bolts 43.

In the pulley supporting bracket 41, a reinforcing rib 51 is provided on a pulley supporting portion 52 to which the inter-cam idler pulley 6 is attached.

The pedestal portion 53 of the pulley support bracket 41 has three bolts
You can see that 42 is attached. The pedestal portion 53 is fixed to a cylinder block (not shown) by the bolts 42.

The operation of this embodiment will be described.

In this embodiment, the inter-cam idler pulley 6 is attached to the pulley supporting bracket 41, and the cavity 45 is formed by the seal member 44 attached to the pulley supporting bracket 41.
Since the front part of is closed, the transmission of noise from the cavity 45 to the timing belt cover 9 is reduced, and the amplification and increase of noise by the timing belt cover is prevented. Moreover,
The pulley support bracket 41 itself is used as a part of the closing member at the front of the cavity 45, and the remaining gap is also used as the pulley support bracket.
Since the structure is closed by the seal member 44 provided in 41, a dedicated part for closing the front part of the cavity 45 is not required, and the cost increase can be suppressed accordingly.

Further, in this embodiment, since the rear portion of the cavity 45 is also closed by the closing member (not shown), not only the noise amplification by the timing belt cover 9 but also the noise itself leaking from the cavity 45 is reduced. It should be noted that such a closing member at the rear portion of the cavity 45 is not always necessary, but when a member such as the timing belt cover 45 that may amplify noise is also arranged at the rear portion of the cavity 45, or when the cavity 45 is not provided. This is especially effective when the noise level itself in the cavity 45 is high due to resonance in the interior.

Although the specific embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various embodiments are included within the scope of the utility model registration claim.

[Effect of device]

According to the present invention, between the intake manifold (and the cooling water connector), the cavity formed in the portion surrounded by the left and right banks, and the timing belt cover are the pulley support bracket and the seal member provided on the bracket. Since it is blocked by the noise, the noise in the cavity is not directly transmitted to the timing belt cover, and the amplification and increase of the noise by the timing belt cover is prevented and the noise is reduced.

Further, according to the present invention, a dedicated part for closing the cavity is not required, so that cost increase can be suppressed.

[Brief description of drawings]

FIG. 1 is a front view of an overhead camshaft type V engine according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is an oil pan and a timing belt. Fig. 1 is a perspective view of the overhead camshaft type V engine of Fig. 1 with the pulley support bracket and pulley removed, Fig. 4 is a perspective view of the overhead camshaft type V engine of Fig. 1, and Fig. 5 is a cam. FIG. 6 is a front view of a conventional overhead camshaft type V engine, and FIG. 7 is a sectional view taken along line VII-VII of FIG. 6. 1,2 …… Cam shaft pulley 6 …… Cam idler pulley 11 …… Timing belt 12 …… Cooling water connector 21 …… Right bank 22 …… Left bank 23 …… Cylinder block 41 …… Pulley support bracket 44 …… Seal member

Claims (1)

[Scope of utility model registration request] 1. An inter-cam idler pulley is provided for tensioning a tension of a timing belt wound around cam shaft pulleys on left and right banks of an overhead cam shaft type V engine, and the inter-cam idler pulley is provided. The pulley is rotatably supported by a pulley support bracket, and the pulley support bracket is fixed to a cylinder block between the left and right banks, and the cooling water inside the engine body is supplied to a radiator between the left and right banks. A cooling water connector for sending is arranged integrally with the intake manifold, and a gap between the pulley support bracket and the cooling water connector, a gap between the pulley support bracket and the left and right cylinder heads, and A seal for filling a gap between the pulley support bracket and the cylinder block Overhead camshaft V-type engine, characterized in that wood is provided in the pulley support bracket.