JPH0442503Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a timing belt cover for a V-type engine, and particularly to a timing belt cover that can suppress vibrations in the portion located between the left and right banks.

[Conventional technology]

In an engine, a camshaft is driven by a crankshaft via a timing belt.

The timing belt is located at the front of the engine, but if dust, mud, water, etc. adhere to the timing belt, the durability of the timing belt will decrease, so the timing belt is covered with a timing belt cover. Further, the mounting portion of the timing belt cover is sealed with a gasket in order to prevent dust, mud, water, etc. from entering the timing belt cover from the mounting portion of the timing belt cover. (for example,
(See U.S. Pat. No. 57-73330, U.S. Pat. No. 59-49736, etc.) FIG. 6 is a front view of a timing belt cover of a conventional V-type engine, where 1 is a timing belt cover and 2 is a timing belt. code 3
The parts marked with are the parts where the timing belt cover 1 is fixed with bolts 11 (bolt fastening parts).

FIG. 7 is a cross-sectional view of FIG. 6, with arrow F pointing forward and arrow U pointing upward.
Further, 1 is a timing belt cover. The timing belt cover 1 is provided with a flange portion 17 that protrudes from the main body of the timing belt cover 1, and the timing belt cover 1 is fixed to the flange portion 17 with a reference numeral 13 by bolts 11. ing.

Here, those marked with numeral 13 are also usually
Since they are called timing belt covers, in order to distinguish between the timing belt cover 1 and the timing belt cover 13, the timing belt cover 1 is referred to as a first timing belt cover 1, and the timing belt cover 13 is referred to as a second timing belt cover. 13 (hereinafter, the same applies to the examples). The second timing belt cover 13 is fixed to a cylinder head (not shown) of the engine, and is fixed so as to connect the left and right banks of the V-type engine.

A timing belt (not shown) is housed in a space 14 that is isolated from the outside world by the first timing belt cover 1 and the second timing belt cover 13. In order to prevent dust, mud, water, etc. from entering the space 14 from the attachment portion of the first timing belt cover 1 and the second timing belt cover 13, such a portion is provided with a gasket 12. It is sealed.

The gasket 12 is provided with a recess 15, and the first timing belt cover 1 is inserted into the recess 15.
The convex portion 16 is fitted to prevent the gasket 12 from moving.

FIG. 8 is a cross-sectional view of FIG. 6, with arrow F pointing forward and arrow U pointing upward.
Further, 1 is a first timing belt cover, 13
is the second timing belt cover. A gasket 12 is interposed between the first timing belt cover 1 and the second timing belt cover 13. As mentioned earlier, gasket 1
2 is provided with a recess 15, and a protrusion 16 of the first timing belt cover 1 is fitted into the recess 15 to position the gasket 12. There are no bolts in Figure 8.

FIG. 9 is a front view of a portion of the gasket of FIGS. 7 and 8, with arrow U pointing upward. Further, the reference numeral 12 indicates the entire gasket. The gasket 12 is provided with a recess 15, as mentioned above.

In FIG. 9, the two-dot chain line represents the position of the first timing belt cover 1 and its flange portion 17. It may be considered that the minus section in FIG. 9 is FIG. 7, and the minus section in FIG. 9 is FIG. 8.

[The problem that the idea aims to solve]

In the conventional V-type engine timing belt cover shown in FIGS. 6 to 9, as can be seen from FIG. There was a problem in that vibrations were likely to occur in the portion of the timing belt cover located between the left and right banks, causing noise.

That is, the second timing belt cover 13
Since the timing belt cover is fixed to connect the left and right banks of the V-type engine, the portion of the timing belt cover located between the left and right banks does not contact the engine body (cylinder head and cylinder block) and has relatively low rigidity. low. A flange portion 17 (bolt fastening portion 3) to which a heavy bolt 11 is attached protrudes from the main body of the timing belt cover. Therefore, since the configuration is such that a heavy object (mass) is provided through a cantilever beam (flange portion 17) at a portion with low rigidity, there is a problem that vibration is likely to occur and cause noise. .

The present invention solves these problems of the conventional technology.

The technical problem of this invention is to eliminate the flange part from the timing belt cover located between the left and right banks of the V-type engine and place the bolt fastening part inside the timing belt cover without deteriorating the sealing performance. By doing so, the purpose is to suppress the generation of vibration and prevent noise.

[Means to solve the problem]

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

That is, the second timing belt cover is fixed to the left and right banks of the V-type engine, and the first timing belt cover covers the timing belt. Located between the left and right banks in a timing belt cover for a V-type engine in which the peripheral edges of the second timing belt cover and the first timing belt cover are fastened together with bolts via a gasket that extends continuously along the direction. The bolt fastening portions of the second timing belt cover and the first timing belt cover are connected to the second timing belt cover and the first timing belt cover.
The upper edge of the second timing belt cover and the upper edge of the first timing belt cover are arranged inwardly from the upper edge of the timing belt cover, and the upper edge of the second timing belt cover and the upper edge of the first timing belt cover extend substantially straight in a substantially horizontal direction, and are fastened with bolts. In the part, the gasket is arranged inside the bolted part, and the width of the gasket is narrower than the part where the bolt is not fastened.

[Effect]

In the timing belt cover for a V-type engine of the present invention, the bolt fastening portion of the second timing belt cover and the first timing belt cover located between the left and right banks is located at the upper edge of the second timing belt cover and the first timing belt cover. The upper edge of the second timing belt cover and the upper edge of the first timing belt cover extend substantially straight in a substantially horizontal direction.
Therefore, in the portion located between the left and right banks of the timing belt cover, which has relatively low rigidity, the heavy bolts are housed inside the timing belt cover without protruding from the main body of the timing belt cover. Because of this arrangement, the occurrence of vibration in this part is suppressed.

Further, since the bolt fastening portion located between the left and right banks does not protrude from the main body of the timing belt cover, the timing belt cover can be made compact, and restrictions on the arrangement of other parts in the engine room can be prevented.

Furthermore, since the bolt fastening part is located inward from the upper edge of the second timing belt cover and the first timing belt cover, the gasket needs to have a complicated shape that follows the shape of the bolt fastening part. If the gasket has a uniform width like the conventional gasket, the tightening force of the bolt will not reach the part where the bolt is not tightened, and there is a possibility that the sealing performance will deteriorate. However, because the width of the gasket in the bolted part is made relatively smaller than the width of the gasket in the non-bolted part, the tightening force of the bolt is applied to the non-bolted part by the small width of the gasket in the bolted part. Excessive. Therefore, it is possible to prevent the surface pressure of the portion where the bolt is not fastened from increasing and the sealing performance to deteriorate.

〔Example〕

FIG. 1 is a front view of a timing belt cover for a V-type engine according to an embodiment of the present invention.

In FIG. 1, the right bank 31 of the V-type engine
and the left bank 32 are provided with camshaft pulleys 33 and 34, respectively, and the timing belt 2 is wound between the camshaft pulleys 33 and 34 and the crankshaft pulley 35. 4
1, 42, and 43 are idler pulleys. As can be seen, the first timing belt cover 1
covers the timing belt 2. The portion marked with numeral 3 is a portion where the first timing belt cover 1 is fixed to a second timing belt cover (not shown) with bolts 11.

In addition, 44 is an intake passage, 45 is a surge tank,
46 is an intake manifold. Further, 74 is an engine mount.

There are six parts 3 to which the bolts 11 are fastened (hereinafter referred to as bolt fastening parts), but in the conventional type (Fig. 6), among these, the bolt fastening part on the top surface of the first timing belt cover 1 is used. Part 3, that is, the right bank 31 and the left bank 3 of the V-type engine
The bolt fastening part 3 located between the bolt fastening part 2 and the bolt fastening part 3 protrudes upward (projects upward).

On the other hand, in this embodiment, as can be seen from FIG. 1, among the six bolt fastening parts 3, the bolt fastening part 3 located between the right bank 31 and the left bank 32 of the V-type engine I haven't jumped out. This point is a feature of this embodiment, so this point will be explained in detail.

2 is a perspective view of the first timing belt cover viewed from the direction of arrow Z in FIG. 1. FIG.

In FIG. 2, arrow F indicates the front of the automobile, and arrow U indicates upward. In addition, 1 is a first timing belt cover, 12 is a gasket to be described later,
13 is the second timing belt cover mentioned above. Further, 51 is a bolt hole through which a bolt connecting the first timing belt cover 1 and the second timing belt cover 13 is passed.

As can be seen from FIG. 2, in the bolt fastening portion 3, a recess 52 is provided in the first timing belt cover 1, and a bolt (not shown) is placed in this portion. Therefore, the upper edge 59 of the first timing belt cover 1
extends smoothly and substantially straight in the substantially horizontal direction, and does not protrude upward. The same applies to the upper edge 58 of the second timing belt cover 13.

FIG. 3 is a cross-sectional view of FIG. 1.

In FIG. 3, arrow F points toward the front of the vehicle, and arrow U points upward. Further, 1 is a first timing belt cover. A recess 52 is provided in the first timing belt cover 1 , a bolt 11 is placed in the recess 52 , and the first timing belt cover 1 is fixed to the second timing belt cover 13 by the bolt 11 . has been done. The second timing belt cover 13 is attached to the right bank and left bank cylinder heads (not shown) of the V-type engine.

As can be seen from FIG. 3, the first timing belt cover 1 and the second timing belt cover 1
3 forms a timing belt storage chamber 14 for storing a timing belt (reference numeral 2 in FIG. 1).

Since the first timing belt cover 1 is made of plastic, a metal sleeve 53 is attached to the first timing belt cover 1 in order to pass the bolt 11 through. has been done. The second timing belt cover 13 is made of iron, and a weld nut 54 is attached to the second timing belt cover 13. weld nut 54
A bolt 11 is fastened to.

In order to prevent dust, mud, water, etc. from entering the timing belt storage chamber 14 from the attachment portion of the first timing belt cover 1 and the second timing belt cover 13, this portion is provided with a gasket 12. It is sealed by. That is,
A gasket 12 is provided between the first timing belt cover 1 and the second timing belt cover 13.
is mediated.

The first timing belt cover 1 is provided with a recess 61 for housing the gasket 12, and the gasket 12 is fitted into the recess 61. Thereby, the gasket 12 is positioned so that it does not move.

FIG. 4 is a cross-sectional view of FIG. 1.

In FIG. 4, arrow F points toward the front of the vehicle, and arrow U points upward. Further, 1 is a first timing belt cover, and 13 is a second timing belt cover. A gasket 12 is interposed between the first timing belt cover 1 and the second timing belt cover 13. In FIG. 4, the gasket 12 is provided with a recess 15, and the first timing belt cover 1 is inserted into the recess 15.
The convex portion 16 is inserted to position the gasket 12. There are no bolts in Figure 4.

5 is a front view of a portion of the gasket of FIGS. 3 and 4; FIG.

In FIG. 5, U is upward. Further, the reference numeral 12 indicates the entire gasket. The gasket 12 is composed of a bolt fastening part 3 to which a bolt (numeral 11 in FIG. 3) is fastened, and a bolt non-fastening part 62. As described above, the gasket 12 is provided with the recess 15 in the bolt non-fastening portion 62.

The bolted part 3 has an irregular shape that wraps downward (projects inward), and is not provided with a recessed part 15, and its width t is less than half the width T of the non-bolted part 62. ing.

In FIG. 5, the two-dot chain line represents the position of the first timing belt cover 1. It may be considered that the minus section in FIG. 5 is FIG. 3, and the minus section is FIG. 4.

As can be seen from FIG. 5, the gasket 12 is
Continuously along the circumferential direction of the first timing belt cover 1 and the second timing belt cover between the circumferential edge of the first timing belt cover 1 and the circumferential edge of the second timing belt cover (not shown) It is extending.

In the seal structure of the timing belt cover according to this embodiment, as can be seen from FIG. 1, the bolt fastening portion 3 located between the right bank 31 and the left bank 32 does not protrude upward. That is, the bolt fastening portion 3 is located inwardly from the upper edge 59 of the first timing belt cover 1 and the upper edge 58 of the second timing belt cover 13, so that the bolt fastening portion 3 The upper edge 59 and the upper edge 58 of the second timing belt cover 13 extend smoothly and substantially straight in the substantially horizontal direction.

Therefore, in the portion located between the left and right banks of the timing belt cover, which has relatively low rigidity, the heavy bolt 11 is housed inside the timing belt cover without protruding from the main body of the timing belt cover. Since the structure is arranged in such a way that vibrations are not generated in this part.

Furthermore, there is no restriction on the arrangement of other parts in the engine room, and the various pipes and high-pressure cord piping above the first timing belt cover 1 and second timing belt cover 13 are not restricted. I won't receive it. In other words, in this embodiment, the whole is very compact, so the first timing belt cover 1 and the second timing belt cover 1 are
The influence of the timing belt cover 13 on other parts of the engine is minimized.

In this embodiment, the width t of the bolted portion 3 of the gasket 12 is set to be less than half the width T of the non-bolted portion 62 for the following two reasons.

First, since the bolt fastening portion 3 is disposed inward from the upper edge 59 of the first timing belt cover 1 and the upper edge 58 of the second timing belt cover 13, the gasket 12 is shaped like the bolt fastening portion 3. If the gasket has a uniform width like a conventional gasket, the tightening force of the bolt 11 will not reach the bolt-unfastened part 62, and the sealing performance may deteriorate. . However, since the width of the gasket 12 in the bolted part 3 is relatively smaller than the width of the gasket 12 in the non-bolted part 62, the tightening force of the bolt 11 at the bolted part 3 is reduced by the smaller width of the gasket 12. It also extends to the bolt non-fastening portion 62 . Therefore,
It is possible to prevent the surface pressure of the bolt-unfastened portion 62 from increasing and the sealing performance from deteriorating.

In addition, since the bolt 11 is in the bolt fastening part 3, the surface pressure is high, and sufficient sealing performance can be obtained even if the width of the gasket 12 is small.
There is no problem even if the width is made smaller.

Second, since there are the timing belt 2, camshaft pulleys 33, 34, etc. inside the first timing belt cover 1, the width of the gasket 12 in the bolt fastened part 3 is also adjusted to the non-bolt fastened part 62.
If the value is set to be the same, there is a risk that the bolt fastening portion 3 may interfere with the timing belt 2, camshaft pulleys 33, 34, etc. In this way, the width of the gasket 12 is reduced to prevent interference therewith.

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

[Effect of idea]

According to the present invention, the second bank located between the left and right banks
The bolt fastening portions of the timing belt cover and the first timing belt cover are arranged inwardly from the upper edges of the second timing belt cover and the first timing belt cover, and are connected to the upper edges of the second timing belt cover. Since the upper edge of the first timing belt cover extends substantially straight in a substantially horizontal direction, the portion of the timing belt cover located between the left and right banks, which has relatively low rigidity,
Since the heavy bolts are housed inside the timing belt cover without protruding from the main body of the timing belt cover, the generation of vibrations in this part is suppressed and the generation of noise can be prevented.

Further, since the bolt fastening portion located between the left and right banks does not protrude from the main body of the timing belt cover, the timing belt cover can be made compact, and restrictions on the arrangement of other parts in the engine room can be prevented.

Furthermore, even if the shape of the gasket around the bolted part becomes complex, the width of the gasket at the bolted part is made relatively smaller than the width of the gasket in the non-bolted part, so the width of the gasket at the bolted part can be reduced. Since the tightening force of the bolt is extended to the portion where the bolt is not fastened by the small amount, and the surface pressure of the portion where the bolt is not fastened increases, the sealing performance is not deteriorated.

[Brief explanation of the drawing]

FIG. 1 is a front view of a timing belt cover for a V-type engine according to an embodiment of the present invention, and FIG. 2 is a perspective view of a first timing belt cover seen from the direction of arrow Z in FIG. Figure 3 shows the first
4 is a cross-sectional view of FIG. 1, FIG. 5 is a front view of a portion of the gasket in FIGS. 3 and 4, and FIG. 6 is a conventional V-type engine. 7 is a cross-sectional view of the timing belt cover of FIG. 6, FIG. 8 is a cross-sectional view of the timing belt cover of FIG. It is a front view of a part. 1...First timing belt cover, 2...
Timing belt, 3... Part where the bolt is fastened (bolt fastening part), 11... Bolt, 12
... Gasket, 13 ... Second timing belt cover, 14 ... Timing belt storage chamber, 3
1... Right bank, 32... Left bank, 58... Upper edge of second timing belt cover, 59... Upper edge of first timing belt cover, 62... Part where bolts are not fastened (bolt non-fastened parts).

Claims (1)

[Claims for Utility Model Registration] A second timing belt cover fixed to the left and right banks of a V-type engine, and a first timing belt cover that covers the timing belt. In a timing belt cover for a V-type engine, in which the circumferential edges of a second timing belt cover and a first timing belt cover are fastened with bolts via a gasket that extends continuously along the circumferential direction of the timing belt cover, Bolt fastening portions of the second timing belt cover and the first timing belt cover located between the left and right banks are arranged inwardly from upper edges of the second timing belt cover and the first timing belt cover. , the upper edge of the second timing belt cover and the upper edge of the first timing belt cover extend substantially straight in a substantially horizontal direction, and the gasket is inserted into the bolt fastening portion at the bolt fastening portion. A timing belt cover for a V-type engine, characterized in that the gasket is disposed inward and the width of the gasket is narrower than that of the non-bolted part.