JPH10281244A - Support structure of timing chain guide member of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve rigidity of an engine constitutional member at low cost by supporting a guide member provided on a timing chain by a support surface part formed on a part of at least one engine constitutional member of a cylinder block, a cylinder head and a timing chain cover. SOLUTION: A support surface part is provided on a part of at least one engine constitutional member of a cylinder block 4, a cylinder head 6 and a timing chain cover so as to improve supporting rigidity by making a guide member contact with it. For example, a rib 32 extending in the shaft direction of a crankshaft is provided on the cylinder block 4. The rib 32 is constituted of a first rib 32-1 and a second rib 32-2, and their projected end surfaces are functioned as the support surface part. Thereafter, a timing chain contentioner 26 is supported on two points by making a tensioner side surface rib 26-3 of the timing chain contentioner 26 as the guide member contact with the support surface part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a timing chain guide member of an engine, and more particularly, when a guide member is mounted on an engine, the guide member is brought into contact with a support surface provided on a part of an engine component. The present invention relates to a support structure for a timing chain guide member of an engine capable of reducing vibration and noise by supporting a guide member by a support surface portion and improving rigidity of an engine component.

[0002]

2. Description of the Related Art An engine has a crankshaft that converts a reciprocating motion of a piston into a rotary motion. The driving force, which is a rotational force from the crankshaft, is transmitted to, for example, a camshaft, and the camshaft converts the rotational operation into an opening / closing operation of an intake / exhaust valve.

At this time, a timing chain is wound around a crank sprocket mounted on the crankshaft and first and second cam sprockets mounted on two first and second camshafts respectively. Driving force transmission path.

A timing chain tensioner is provided as a guide member in the vicinity of the timing chain, and the adjuster presses the timing chain tensioner against the timing chain to apply an appropriate tension to the timing chain.

As a support structure for the timing chain guide member of the engine, there is one disclosed in Japanese Patent Application Laid-Open No. 61-171944. In the automatic tensioning device for a winding transmission member in an internal combustion engine disclosed in this publication, first, the swing fulcrum, the movable arm, and the lock mechanism of the tension slipper are all disposed inside the winding transmission member, and the winding transmission member Second, the movable arm is a bell crank, and the arm length of the bell crank connected to the tension slipper is set to the length of the arm that engages with the lock mechanism. The length is set longer than the arm length, the lock mechanism is made more compact, and the internal combustion engine is made more compact.

[0006] Further, there is one disclosed in Japanese Utility Model Publication No. 61-41463. The endless revolving body tensioner mechanism disclosed in this publication includes an endless revolving body wound around a drive wheel and a double-acting wheel, and is pressed inward from the outer side of the revolving body and traversed from both sides in the width direction of the revolving body. A contact member whose one end is pivotally supported so as to be swingable about an axis parallel to the wheel axis in the vicinity of the drive wheel inside the body, and the other end of the contact member sandwiches both sides of the transporting body. One end of the connecting member has a pair of connecting members pivotally attached thereto, and a tensioner disposed obliquely to the longitudinal direction of the contact member and disposed inside the recirculating body. Are gently curved toward the center of the endless revolving body, and the other end of the connecting member is pivotally connected to the movable part of the tensioner to prevent the endless revolving body from rolling and to be compact.

[0007] Further, there is one disclosed in Japanese Utility Model Laid-Open No. 58-89638. The endless revolving body tensioner mechanism disclosed in this publication pivotally supports one of the members abutting from the outside of the endless revolving body and connects the other of the abutting members to a flexible member having one fixed thereto, Means for tensioning the flexible member is disposed inside the endless revolving body.

[0008] Furthermore, there is one disclosed in Japanese Utility Model Laid-Open No. 4-113354. In the hydraulic plunger type chain tensioner disclosed in this publication, a bucket for collecting and storing oil to supply oil to a plunger body of the hydraulic plunger is made of rubber, and an upper opening edge of the bucket is applied along a wall surface of the chain chamber. The oil supplied to the hydraulic plunger is collected more reliably.

[0009]

By the way, in a conventional structure for supporting a timing chain guide member of an engine, a timing chain tensioner or a guide member formed of a timing chain guide member is used to prevent the guide member from swinging in a crankshaft direction. The following measures are taken.

That is, when the guide member is a timing chain tensioner, ribs 172 are provided at both ends of a tensioner pad 126-4 of the timing chain tensioner 126, as shown in FIGS.
The timing chain tensioner 126 is fixed by the adjuster 128.

When the guide member is a timing chain guide member, the rigidity is improved by increasing the number of bolts for supporting the timing chain guide member, or by changing the material and increasing the wall thickness. There are ways to do this.

However, in the measure for fixing the timing chain tensioner by the adjuster, it is necessary to provide ribs at both ends of the tensioner pad of the timing chain tensioner, which is difficult to manufacture and increases the cost.
There is a disadvantage that it is economically disadvantageous.

In the measure for increasing the number of bolts for supporting the timing chain guide member, the number of parts is increased, and drilling work for the bolt engaging hole is required, so that the number of working steps is increased. The cost is increased, which is economically disadvantageous, and the workability of bolt mounting is also deteriorated, which is disadvantageous in practical use.

Further, in the measure for improving rigidity by changing the material and increasing the thickness, the weight is increased by changing the material and increasing the thickness, which is disadvantageous in practical use and increases the cost. However, there is a disadvantage that it is economically disadvantageous.

[0015]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention provides an engine having a cylinder block, a cylinder head, and a timing chain cover surrounding a timing chain. A member is provided, and a support surface is provided on a part of at least one of the engine components of the cylinder block, the cylinder head, and the timing chain cover so as to improve the support rigidity by contacting the guide member. And

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION
When the guide member is mounted on the engine, the guide member comes into contact with a support surface provided on a part of the engine component, and the support member supports the guide member to reduce vibration and noise, and to reduce vibration and noise. The rigidity of the member has been improved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 3 show a first embodiment of the present invention. In FIG. 3, reference numeral 2 denotes an engine mounted on an automobile (not shown), 4 denotes an aluminum alloy cylinder block, 6 denotes an aluminum alloy cylinder head, and 8 denotes a lower case.

The engine 2 includes a cylinder block 4
And a cylinder head 6 mounted on the upper surface of the cylinder block 4 and a lower case 8 mounted on the lower surface of the cylinder block 4.

A crankshaft 10 is pivotally supported by the lower surface of the cylinder block 4 and the lower case 8, and two first and second camshafts 12, 14 are pivotally mounted on the upper surface of the cylinder head 6. .

A crank sprocket 16 is mounted on one end of the crankshaft 10, that is, on one surface side of the engine 2, and first and second camshafts 12 and 14 are mounted on one end of the first and second camshafts 12 and 14, respectively. The two-cam sprockets 18 and 20 are mounted respectively, and the timing chain 22 is wound around the crank sprocket 16 and the first and second cam sprockets 18 and 20.

The tension side of the timing chain 22,
That is, the timing chain guide member 24 is disposed near the outside of the right timing chain 22 in FIG.
A timing chain tensioner 26 made of an aluminum alloy is disposed on the loose side of the timing chain 22, that is, near the outside of the timing chain 22 on the left side in FIG. 3, and the timing chain tensioner 26 is swingable around the upper end. It is mounted on the cylinder head 6 as much as possible.

An adjuster 28 is provided outside the timing chain 22 on the loose side.

Further, in order to improve the support rigidity by bringing the guide members into contact with each other, a support surface portion 30 is provided on a part of at least one engine component of the cylinder block 4, the cylinder head 6, and a timing chain cover (not shown). And

More specifically, the guide member is, for example, a timing chain tensioner 26.

The cylinder block 4 is provided with a rib 32 extending in the axial direction of the crankshaft.
The projecting end surface of the rib 32 functions as the support surface portion 30 so that the timing chain tensioner 26 is brought into contact with the projecting end surface of the second 2 to support the timing chain tensioner 26.

As shown in FIG. 1, the timing chain tensioner 26 has a main body 26- made of aluminum alloy.
1, a resin-made sliding surface portion 26-2 serving as a sliding portion of the timing chain 22 of the main body portion 26-1, and a main body portion 2
6-1 and the sliding surface portion 2 in a direction orthogonal to the longitudinal direction.
It has a plurality of aluminum alloy tensioner side ribs 26-3 extending in the direction away from the vicinity of 6-2 and a tensioner pad 26-4 provided at the lower end.

Further, as shown by hatched portions in FIG. 1, the ribs 32 include a first rib 32-1 extending to near the mating surface of the cylinder block 4 and the cylinder head 6, and a tensioner pad 26- of the timing chain tensioner 26. 4
A second rib 32-2 formed in the vicinity,
Support surface portion 3 as a protruding end surface of second ribs 32-1 and 32-2
The timing chain tensioner 26 supports the timing chain tensioner 26 at two points by bringing the tensioner side rib 26-3 of the timing chain tensioner 26 into contact with the timing chain tensioner 26.

Next, the operation will be described.

When the timing chain tensioner 26 is mounted on the engine 2, the first and second ribs 32-
The tensioner side rib 26-3 of the timing chain tensioner 26 is provided on the support surface portion 30 as the protruding end surface of the first and second 32-2.
Contact the first and second ribs 32-1 and 32-2.
The timing chain tensioner 26 is supported at two points -2, and the operation of the timing chain tensioner 26 in the axial direction of the crankshaft 10 and toward the rear of the engine is regulated.

As a result, the guide member can be supported by the support surface portion 30 formed on a part of at least one engine component including the cylinder block 4, the cylinder head 6, and a timing chain cover (not shown). Noise can be reduced, which is practically advantageous.

When forming the support surface portion 30,
This can be realized without increasing the number of parts,
By doing so, the rigidity of the engine components can be improved, the configuration is not complicated, the production is easy, the cost can be kept low, and it is economically advantageous.

Further, the guide member is a timing chain tensioner 26 and the protruding end surface of the rib 32 formed on the cylinder block 4 functions as a support surface portion 30. The operation of the timing chain tensioner 26 toward the rear of the engine is restricted, so that the vibration and noise of the timing chain tensioner 26 can be reduced, and the rigidity of the cylinder block 4 can be improved. Thus, the cost can be kept low.

FIGS. 4 and 5 show a second embodiment of the present invention. In the second embodiment, portions that perform the same functions as those in the first embodiment will be described with the same reference numerals.

The feature of the second embodiment is that the guide member is a timing chain guide member 24 and the ribs 42 provided on the cylinder block 4 and / or the cylinder head 6 function as a support surface portion 44. It is in the point which did.

That is, as shown by the hatched portion in FIG. 4, a first rib 42-1 is provided near the mating surface of the cylinder block 4 and the cylinder head 6 so as to protrude toward the front of the engine. As shown by the hatched portion, the cylinder block 4 is provided with a second rib 42-2 protruding forward of the engine.

Then, the first and second ribs 42-1, 42-
Second, in order to support the timing chain guide member 24 by contacting the rear portion of the timing chain guide member 24 with the front portion of the timing chain guide member 24 that contacts the timing chain 22,
The second ribs 42-1 and 42-2 function as the support surface portion 44.

At this time, as shown in FIG. 5, the timing chain 22 is pressed by the force F, and the timing chain guide member 24 is also pressed.

Then, the guide member can be supported by the support surface portion 44 formed on a part of at least one engine constituent member of the cylinder block 4, the cylinder head 6, and the timing chain cover (not shown). As in the first embodiment, vibration and noise can be reduced, which is practically advantageous.

When forming the support surface portion 44,
By realizing it without increasing the number of parts,
As in the case of the first embodiment, the rigidity of the engine components can be improved by the support surface portion 44, the configuration is not complicated, the production is easy, the cost can be maintained at low cost, and the cost is low. It is also advantageous.

Further, the guide member is a timing chain guide member 24 and ribs 42 formed on the cylinder block 4 and / or the cylinder head 6.
Function as a support surface portion 44, the support surface portion 44 regulates the operation of the timing chain guide member 24 in the direction away from the timing chain 22, the axial direction of the crankshaft 10, and the rear of the engine. Vibration and noise can be reduced, and the rigidity of the cylinder block 4 and the cylinder head 6 can be improved. Further, the structure is not complicated, the production is easy, and the cost can be kept low.

FIG. 6 shows a third embodiment of the present invention.

The feature of the third embodiment is that the projecting end surface of the rib 54 formed along the bolt boss 52 functions as a support surface portion 56.

That is, when a plurality of bolt bosses 52 extending in the cylinder axis direction of the cylinder block 4 are provided as shown by hatched portions in FIG. 6, the cylinders located along the bolt bosses 52, ie, the upper and lower portions in FIG. In the first bolt boss 52-1 for the head bolt and the second bolt boss 52-2 for the lower case bolt,
A rib 54 is formed to connect the second bolt bosses 52-1 and 52-2.

The projecting end surface of the rib 54 functions as a support surface 56 so that a timing chain guide member (not shown) is brought into contact with the projecting end surface of the rib 54 to support the timing chain guide member.

Then, the guide member can be supported by the support surface portion 56 formed on a part of at least one engine component of the cylinder block 4, the cylinder head 6, and the timing chain cover (not shown). As in the first and second embodiments, vibration and noise can be reduced, which is practically advantageous.

Further, when forming the support surface portion 56,
By realizing it without increasing the number of parts,
As in the first and second embodiments, the supporting surface 56
By doing so, the rigidity of the engine components can be improved, the configuration is not complicated, the production is easy, the cost can be kept low, and it is economically advantageous.

Further, the guide member is used as a timing chain guide member, and the projecting end surface of the rib 54 formed on the cylinder block 4 functions as a support surface portion 56. The operation of the timing chain guide member toward the rear of the engine can be restricted, vibration and noise of the timing chain guide member can be reduced, and the rigidity of the cylinder block 4 can be improved. Thus, the cost can be kept low.

It should be noted that the present invention is not limited to the above-described embodiment, and various applications and modifications are possible.

For example, in the second embodiment of the present invention, the guide member is a timing chain guide member 24, and the first rib 42 is protruded forward of the engine near the mating surface of the cylinder block 4 and the cylinder head 6. 1
And a second rib 42-2 is provided on the cylinder block 4 so as to protrude forward of the engine.
Although the ribs 42-1 and 42-2 are configured to function as the support surface portion 44, as shown in FIG. 7, a cylinder block (not shown) and / or a cylinder head (not shown) located on the back side of the timing chain guide member 24. A plurality of bosses 62 are formed on a projection (not shown), and a part of the outer peripheral surface of the boss 62 functions as a support surface portion 64 so that the bosses 62 can be used like ribs. Then, the rear surface portion of the timing chain guide member 24 comes into contact with a part of the support surface portion 64 on the outer peripheral surface of the boss 62, and the timing chain guide member 24 is supported.

In the first embodiment of the present invention,
The rib that functions as a support surface is formed only on the cylinder block side, but if a rib with the same height is formed not only on the cylinder block side but also on the timing chain cover side, the timing chain tensioner, timing chain guide member, etc. The ribs can be brought into contact with the guide member from both front and rear sides, and the movement (vibration) in the crankshaft direction and forward of the engine can also be suppressed.

Further, in the first embodiment of the present invention,
Although the engine component is a cylinder block, it may be a cylinder head and / or a timing chain cover in addition to the cylinder block.

[0053]

As described above in detail, according to the present invention, in an engine having a cylinder block, a cylinder head, and a timing chain cover surrounding a timing chain, a guide member is disposed on the timing chain, and the guide is provided. Since at least one engine component of the cylinder block, the cylinder head, and the timing chain cover is provided with a support surface in order to improve the support rigidity by contacting the members, the cylinder block, the cylinder head, and the timing chain cover are provided. The guide member can be supported by the support surface formed on a part of at least one of the engine constituent members, and vibration and noise can be reduced, which is practically advantageous. In addition, when the support surface is formed, it can be realized without increasing the number of parts, the rigidity of the engine components can be improved by the support surface, the configuration is not complicated, the production is easy, and the cost is low. And it is economically advantageous.

[Brief description of the drawings]

FIG. 1 is an enlarged front view of a timing chain tensioner showing a first embodiment of the present invention.

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

FIG. 3 is a schematic front view of the engine.

FIG. 4 is an enlarged front view of a timing chain guide member showing a second embodiment of the present invention.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a front view of a cylinder book of an engine showing a third embodiment of the present invention.

FIG. 7 is a front view of a timing chain guide member showing another embodiment of the present invention.

FIG. 8 is a schematic enlarged front view of a tensioner pad portion of the timing chain tensioner showing the prior art of the present invention.

FIG. 9 is a cross-sectional view taken along line 〓X-〓X of FIG. 8;

[Explanation of symbols]

 2 Engine 4 Cylinder block 6 Cylinder head 8 Lower case 10 Crankshaft 12 First camshaft 14 Second camshaft 16 Crank sprocket 18 First cam sprocket 20 Second cam sprocket 22 Timing chain 24 Timing chain guide member 26 Timing chain tensioner 26- DESCRIPTION OF SYMBOLS 1 Main body part 26-2 Sliding surface part 26-3 Tensioner side surface rib 26-4 Tensioner pad 28 Adjuster 30 Supporting surface part 32 rib 32-1 First rib 32-2 Second rib

Claims (4)

[Claims] In an engine having a cylinder block, a cylinder head, and a timing chain cover surrounding a timing chain, a guide member is provided on the timing chain, and the guide member is brought into contact with the timing chain to improve support rigidity. A support structure for a timing chain guide member of an engine, wherein a support surface portion is provided on a part of at least one engine constituent member of the cylinder block, the cylinder head, and the timing chain cover. The guide member is a timing chain tensioner, and a rib is provided on the cylinder block to extend in the axial direction of the crankshaft. 2. The support structure for a timing chain guide member of an engine according to claim 1, wherein the projecting end surface of the rib functions as a support surface portion. 3. The guide member is a timing chain guide member, and a rib is provided on a cylinder block and / or a cylinder head, and the rib is provided on a front portion of the rib that contacts the timing chain of the timing chain guide member. 2. The support structure for a timing chain guide member of an engine according to claim 1, wherein the rib functions as a support surface so as to support the timing chain guide member by contacting a rear portion of the member. 4. A timing chain guide, wherein a rib is formed along the bolt boss when the bolt boss extending in the cylinder axis direction of the cylinder block is provided, and a timing chain guide member is brought into contact with a protruding end surface of the rib. 2. The support structure of a timing chain guide member for an engine according to claim 1, wherein the projecting end surface of the rib functions as a support surface portion for supporting the member.