JP3203717B2 - V-type DOHC engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-type DOHC engine, and more particularly to a V-shaped cylinder block in which one side and the other side cylinder head are mounted on one side and the other side cylinder bank, respectively. The present invention relates to a V-type DOHC engine in which two one-side and two-side camshafts are respectively disposed on one side and the other side cylinder head.

[0002]

2. Description of the Related Art Vehicle engines include an engine having cylinders arranged in series, an engine having cylinders opposed to each other, and a V-type engine having each bank cylinder arranged in a V-shape.

In this V-type engine, one side and the other side cylinder head are respectively mounted on one side and the other side cylinder bank of a V-shaped cylinder block, and a lower part of the cylinder block cooperates with the cylinder block. In some cases, a bearing cap for supporting the crankshaft is attached.

In the case of a V-type engine, in order to install accessories such as a compressor for an air conditioner and a power steering pump, an accessory bracket is attached to a cylinder block as a mounting bracket, or the engine is mounted on a vehicle body. A mounting bracket and the like for support are provided.

As a valve train of a V-type DOHC engine, there is one disclosed in Japanese Patent Application Laid-Open No. Sho 60-230503. The vehicular valve drive apparatus for a vehicle V-type engine disclosed in this publication includes a V-type engine in which a crankshaft is disposed in a left and right direction in an engine compartment in front of a vehicle compartment and two rows of cylinders are disposed in front and rear. An intake camshaft and an exhaust camshaft are provided for each cylinder row, and a first winding transmission means connects a camshaft and a crankshaft arranged inside each cylinder row on one side of the engine, On the other side, the intake camshaft and the exhaust camshaft of each cylinder are connected by a second winding transmission means to reduce the distance between the shafts, reduce the size of the belt cover, and reduce The amount of protrusion of the belt cover is reduced to reduce interference with the vehicle body side wall and the engine room inner wall.

[0006] There is also one disclosed in Japanese Patent Application Laid-Open No. Sho 64-80708. V-type DOH disclosed in this publication
The valve train of the C engine is a swing arm type V-type DOHC engine having an HLA type end pivot. The intake camshaft and the exhaust camshaft of each bank arranged symmetrically with the center of the V bank as a pair. Gears are connected so that they rotate in opposite directions by gears.The intake camshaft of one bank and the exhaust camshaft of the other bank are driven to rotate in the same direction by a crankshaft, and each end pivot is moved toward the leading end in the cam rotation direction. The HLA is provided with a simple and compact structure to prevent sinking of the HLA, and a common cylinder head is used.

Further, there is another one disclosed in Japanese Patent Application Laid-Open No. 2-169808. The camshaft driving device of the DOHC engine disclosed in this publication mounts a cylinder head on which two camshafts for driving the opening and closing of an intake valve and an exhaust valve respectively are mounted on each bank branched and formed at the top of a cylinder block. At the same time, the crankshaft is attached to the cylinder block to rotate the camshaft, the cylinder head end is extended to the side, and the sprocket chamber for accommodating the sprocket at the camshaft end is formed in the extension. An idler gear integrally formed with a large-diameter gear and a small-diameter gear is disposed above each bank of the cylinder block, and the idler gears of both banks are covered with a single front cover to reduce the rotational force of the crankshaft. After transmitting to each idler gear via one chain, transmission is performed from each idler gear to the sprocket at the camshaft end via the second chain. The sidewall central portion of the cylinder block by effectively utilizing the arrangement of auxiliary device, thereby achieving the downsizing of the engine.

[0008]

By the way, in a conventional valve train of a V-type engine, two camshafts for an intake valve having two cylinder heads located inside and a crankshaft are connected to a chain or the like. There are those that communicate by means of power transmission means.

However, as shown by a chain line in FIG. 1, the bank space was small due to the outer shape A of the chain cover being formed.

As a result, it is difficult to install accessories and other parts in a small bank space, and there is a disadvantage that the usability is poor.

Further, there is a type in which a camshaft for an intake valve of one cylinder bank, a camshaft for an exhaust valve of the other cylinder bank, and a crankshaft are connected by a power transmission means such as a chain.

However, the chain cover B above the exhaust valve camshaft protrudes outward as shown by a two-dot chain line in FIG. 1, and there is a disadvantage that the engine becomes large.

Further, there is a type in which an intermediate shaft is provided on each of the first and second cylinder banks, and the two intermediate shafts and the crankshaft are connected by a power transmission means such as a chain.

However, the provision of the two intermediate shafts increases the number of parts, complicates the configuration, increases the size of the engine, makes it difficult to manufacture, increases the cost, and is economically disadvantageous. Is disadvantageous.

[0015]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention mounts one side and the other side cylinder head on one side and the other side cylinder bank of a V-shaped cylinder block. In a V-type DOHC engine in which two one-side and other-side camshafts are respectively disposed on one side and the other-side cylinder head, the V-type DOHC engine is located between two one-side camshafts disposed on one side of the cylinder head. An intermediate shaft is provided on the cylinder head, and first endless flexible is provided on sprockets provided on the V bank side of the two other camshafts, the intermediate shaft and the crankshaft, respectively, which are provided on the other cylinder head. Wrap the members around
The first endless flexible member connects the other camshaft on the V bank side, the intermediate shaft, and the crankshaft, and the first endless flexible member between the other camshaft on the V bank side and the crankshaft is provided. A chain tensioner for applying tension to the flexible member is provided, and the chain is provided on two one-side camshafts provided on the one-side cylinder head and an intermediate shaft provided with the one-side first endless flexible member, respectively. A second endless flexible member is wound around the sprocket, and one side of the camshaft and the intermediate shaft are connected to each other by the second endless flexible member. It is characterized in that it is provided in communication with an endless flexible member. In addition, one side and the other side cylinder head are mounted on one side and the other side cylinder bank of the V-shaped cylinder block, and two one side and the other side camshafts are respectively arranged on the one side and the other side cylinder head. V with two camshafts oriented in the width direction of the vehicle
In a type DOHC engine, a cylinder head located between two one-side camshafts disposed on one cylinder head and a cylinder head disposed on the other cylinder head are disposed.
A first endless flexible member is wound around a sprocket provided on each of the V bank side, the intermediate shaft, and the crankshaft of the other camshaft on the other side, and the other camshaft on the V bank side is wound by the first endless flexible member. And an intermediate shaft and a crankshaft are provided in communication with each other, and a chain tensioner for applying tension to the first endless flexible member between the other camshaft on the V bank side and the crankshaft is provided. The first endless flexible member is wound around a sprocket provided on each of two one-side camshafts disposed on the intermediate shaft provided with the one endless first endless flexible member, and the one-side camshaft. And an intermediate shaft are connected by a second endless flexible member, and two other camshafts provided on the other cylinder head are connected by a third endless flexible member. The diameter of the sprocket is first endless flexible member is wound around the other side camshaft and an intermediate shaft of the V-bank, the second endless flexible member and the third
The endless flexible member is formed to be larger than the diameter of a sprocket around which the endless flexible member is wound, and the one cylinder head is located forward of the other cylinder head.

[0016]

According to the invention as described above, the driving force from the crankshaft is transmitted by the first endless flexible member to the other camshaft on the V bank side of the other cylinder head and the intermediate shaft. Is transmitted to the two camshafts of the one cylinder head by the second endless flexible member, and is transmitted to the two camshafts of the other cylinder head by the third endless flexible member. And a large space is secured in the cylinder bank on one side and the other side of the V-shaped cylinder block.

[0017]

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

FIG. 1 shows an embodiment of the present invention. In FIG. 1, 2 is a V-type DOHC engine, 4 is V
-Shaped cylinder block, 6-1 and 6-2 are on one side,
The other cylinder banks, 8-1 and 8-2, are one side, the other cylinder heads 10-1, 10-2 are one side, the other head cover, and 12 are oil pans.

That is, the V-type DOHC engine 2 has one side of the V-shaped cylinder block 4 and the other side of the cylinder banks 6-1 and 6-2, and the other side of the cylinder head 8-.
1 and 8-2, and the one side and the other side head cover 10- are mounted on the one side and the other side cylinder heads 8-1 and 8-2.
1 and 10-2, and a bearing cap (not shown) is attached to a lower portion of the cylinder block 4, and an oil pan 12 is attached to a lower portion of the bearing cap.

In the front-back direction of the V-type DOHC engine 2, a crankshaft 14 is rotatably supported by a cylinder block 4 and a bearing cap (not shown). At one end of the crankshaft 14, for example, a sprocket 16 for the crankshaft 14 is attached.

Also, two one-side camshafts 18 for the intake valve and one camshaft 20 for the exhaust valve are provided in the one-side head cover 10-1 of the one-side cylinder head 8-1, respectively. , The other cylinder head 8-
Two other camshafts 22 for the intake valve and the other camshaft 24 for the exhaust valve are respectively disposed in the other second head cover 10-2.

The V on the space 26 side sandwiched between the one and other cylinder heads 8-1 and 8-2.
One side and the other side camshaft 1 for the intake valve on the bank side
8 and 22 are located respectively.

Further, small-diameter sprockets 28 and 30 are provided at one ends of the intake valve one-side camshaft 18 and the exhaust valve one-side camshaft 20, respectively.

The large diameter sprocket 32 and the small diameter sprockets 28, 3
A small-diameter sprocket 34 having the same shape as the small-diameter sprockets 28, 30 and 32 is disposed at one end of the other-side camshaft 24 for the exhaust valve.

Then, one of the two camshafts, one for the intake valve and the other for the exhaust valve, are disposed on the one cylinder head 8-1.
The intermediate shaft 38 is disposed on the one-side cylinder head 8-1 located between the two cylinders, and the other cam for the intake valve is the two other-side camshafts disposed on the other cylinder head 8-2. The first endless flexible member 40 is provided on the V-bank side of the shaft 22 and the other camshaft 24 for the exhaust valve, that is, the sprockets provided on the other camshaft 22 for the intake valve, the intermediate shaft 38 and the crankshaft 14, respectively. The first endless flexible member 40 winds the other camshaft 22 for the intake valve on the V bank side, the intermediate shaft 38 and the crankshaft 14.
A chain tensioner 52 for applying tension to the first endless flexible member 40 between the crankshaft 14 and the other camshaft 22 for the intake valve on the V-bank side; The one side camshaft 18 for the intake valve, the one side camshaft 20 for the exhaust valve, and the first endless flexible member 40 on the one side, which are two one side camshafts disposed on the head 8-1, are provided. A second endless flexible member 42 is attached to a sprocket provided on each of the intermediate shafts 38.
And a second endless flexible member 42 for connecting the one side camshaft 18 for the intake valve, the one side camshaft 20 for the exhaust valve, and the intermediate shaft 38 by the second endless flexible member 42, and the other side cylinder. A configuration in which the other camshaft 22 for the intake valve and the other camshaft 24 for the exhaust valve, which are the two other camshafts disposed on the head 8-2, are connected by a third endless flexible member 44. And

More specifically, the one-side cylinder head 8-1
An intermediate shaft 38 is disposed between the two intake valve one-side camshafts 18 and the exhaust valve one-side camshaft 20 and the crankshaft 14, and a large-diameter sprocket 46 and a small-diameter sprocket 48 are provided at one end of the intermediate shaft 38. Is arranged.

The large sprocket 32 of the other camshaft 22 for the intake valve on the V bank side of the other cylinder head 8-2, the large sprocket 46 of the intermediate shaft 38, and the sprocket 16 of the crankshaft 14 are separated from the chain. The first endless flexible member 40 is provided in communication therewith.

At this time, one rotation of the crankshaft 14 corresponds to one side of the intake valve and the other side of the camshaft 18 for the intake valve.
2 and one side and exhaust side camshafts 20 and 24 for exhaust valve
The number of teeth of each sprocket is set so that each of them rotates １ ／.

Then, the one-side cylinder head 8-1
Small sprockets 28, 30 of the two intake valve one-side camshafts 18 and exhaust valve one-side camshafts 20
And the small-diameter sprocket 48 of the intermediate shaft 38 are connected by a second endless flexible member 42 made of chain.

The small-diameter sprocket 3 of the two other-side camshafts 22 for the intake valve and the other-side camshaft 24 for the exhaust valve disposed on the other-side cylinder head 8-2.
4 and 36 are connected by a third endless flexible member 44 made of chain.

Reference numeral 50 denotes the first endless flexible member 4.
0 is a sprocket that functions as a tension and drives a water pump (not shown).

Next, the operation will be described.

When the V-shaped DOHC engine 2 is driven, the crankshaft 14 rotates, and the driving force is applied to the first endless flexible member 40 via the sprocket 16 provided at one end.
Leads to.

Then, the other end of the cylinder head 8-2 by the first endless flexible member 40 via the large-diameter sprocket 32.
And transmitted to the sprocket 50 that drives the water pump, and to the intermediate shaft 38 via the large-diameter sprocket 46.

The small-diameter sprocket 48 of the intermediate shaft 38
From the second endless flexible member 42 to the small-diameter sprocket 2
The driving force is transmitted to the one-side cylinder head 8-1 via the intake valve one-side camshaft 18 and the exhaust-valve one-side camshaft 20 through the one-side cylinder head 8-1 via the first and second cylinder heads 8 and 30.
The intake / exhaust valve (not shown) on the -1 side is opened and closed.

Further, from the small diameter sprocket 34 of the other camshaft 22 for the intake valve of the other cylinder head 8-2 to the third endless flexible member 44, the small diameter sprocket 36 is formed.
The driving force is transmitted to the other camshaft 24 for the exhaust valve via the, and the intake / exhaust valve (not shown) on the other cylinder head 8-2 side is opened and closed.

Thus, the one-side cylinder head 8
-1, one side head cover 10-1 can be reduced in size as compared with the related art, a large space 26 can be secured, auxiliary equipment and other parts can be easily installed, and the usability is improved. Can be improved.

Further, since the overall height of the one-side cylinder head 8-1 can be reduced, for example, when the V-type DOHC engine 2 is placed in the FF type horizontally, the hood can be further reduced. It is practically advantageous.

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

For example, in the embodiment of the present invention, a chain is used as the first to third endless flexible members. However, a member capable of transmitting power other than the chain, for example, a timing belt may be used. It is.

Further, the V-type DOHC engine 2a can be placed in a horizontal state.

That is, as shown in FIG. 2, one cylinder head 8a-1 is disposed in front of the vehicle in the traveling direction, and the other cylinder head 8a-2 is disposed in the rear.

At this time, the one-side cylinder head 8
a-1 two camshafts 18a disposed in
The other camshaft 22 for the intake valve, which is on the V bank side of the two other camshafts disposed on the other cylinder head 8a-2, is provided on the cylinder head located between the cylinder heads 20a and 20a.
a, an intermediate shaft 38a, and a sprocket 32a, 46a, 16a provided on the crankshaft 14a, respectively.
a, the other camshaft 22a for the intake valve, which is the other camshaft on the V bank side, the intermediate shaft 38a, and the crankshaft 14a are provided in communication with each other.

A chain tensioner (not shown) for applying tension to the first endless flexible member 40a between the crankshaft 14a and the other camshaft 22a for the intake valve, which is the other camshaft on the V bank side. Z)
Sprockets 28a, 30a respectively provided on two one-side camshafts 18a, 20a provided on the one-side cylinder head 8a-1 and an intermediate shaft 38a provided with the one-side first endless flexible member 40a. The second endless flexible member 42a is wound around the sprocket provided on the intermediate shaft 38a (the disclosure of the sprocket provided on the intermediate shaft 38a is omitted).
The second shaft 20a and the intermediate shaft 38a are connected by a second endless flexible member 42a.

Further, two other camshafts 22a, 24a provided on the other cylinder head 8a-2 are connected to each other by a third endless flexible member 44a, and the other camshaft on the V bank side is provided. Sprockets 32a and 46a around which the first endless flexible member 40a is wound around the other intake camshaft 22a for the intake valve and the intermediate shaft 38a.
Is larger than the diameter of the sprockets 34a and 48a around which the second endless flexible member 42a and the third endless flexible member 44a are wound, and the one cylinder head 8a-1 is separated from the other cylinder head 8a-2. Also put forward.

Further, as shown in FIG. 2, a first endless flexible member 40a is disposed in front of the third endless flexible member 44a, and a second endless flexible member is provided in front of the first endless flexible member 40a. The member 42a is provided. Reference numeral 62a is a brake master back, and 64a is a master cylinder.

By setting the V-type DOHC engine to the FF type horizontally, the one-side cylinder head 8a-1 whose height is suppressed is changed to the other-side cylinder head 8a.
The third endless flexible member 44a disposed on the other bank side where the mounting space is formed can be located in front of a-2, and the bonnet can be lowered, which is practically advantageous. To the other cylinder head 8a
-2 side, and the mounting space can be enlarged in the axial direction of the crankshaft.

[0048]

As described above in detail, according to the present invention, one side and the other side cylinder head are mounted on one side of the V-shaped cylinder block and the other side cylinder bank on the other side cylinder bank. 2 heads each
V-shaped DOH with camshafts on one side and the other side
In the C engine, an intermediate shaft is provided on a cylinder head located between two one-side camshafts provided on one cylinder head, and two other sides provided on the other cylinder head are provided. A first endless flexible member is wound around a sprocket provided on each of the V bank side, the intermediate shaft, and the crankshaft of the camshaft, and the other camshaft, the intermediate shaft, and the crank on the V bank side are wound by the first endless flexible member. A first endless flexible member provided between the other camshaft and the crankshaft on the V bank side, and a chain tensioner provided on one side of the cylinder head; The second endless flexible member is wound around a sprocket provided on an intermediate shaft provided with one side of the first camshaft and one side of the first endless flexible member. Since the intermediate shaft is provided in communication with the second endless flexible member and the two camshafts provided in the other cylinder head are provided in communication with the third endless flexible member, the one end of the one cylinder head is provided. The head cover can be made smaller than before, a large space can be secured, auxiliary equipment and other parts can be easily installed, and usability can be improved.

Also, one side and the other side cylinder head are mounted on one side and the other side cylinder bank of the V-shaped cylinder block, and two one side and the other side cams are respectively mounted on the one side and the other side cylinder head. V with two camshafts oriented in the width direction of the vehicle.
In a type DOHC engine, a cylinder head located between two one-side camshafts disposed on one cylinder head and a cylinder head disposed on the other cylinder head are disposed.
The first endless flexible member is wound around a sprocket provided on each of the V bank side, the intermediate shaft, and the crankshaft of the other side camshaft, and the first endless flexible member is connected to the other side camshaft on the V bank side. An intermediate shaft and a crankshaft are provided in communication with each other, and a chain tensioner for applying tension to a first endless flexible member between the other camshaft on the V bank side and the crankshaft is provided, and is provided on one cylinder head. The two endless flexible members are wound around sprockets provided respectively on two intermediate shafts provided with two one-side camshafts and one first endless flexible member. Are connected to each other by a second endless flexible member, and two other camshafts provided on the other cylinder head are connected to each other by a third endless flexible member. The diameter of the sprocket around which the first endless flexible member is wound around the other end of the camshaft and the intermediate shaft is larger than the diameter of the sprocket around which the second endless flexible member and the third endless flexible member are wound. By positioning the cylinder head ahead of the other cylinder head, the V-type DOHC engine is placed in the FF type horizontally so that the one-side cylinder head whose height is suppressed is located ahead of the other cylinder head. And the bonnet can be lowered, which is practically advantageous, and the third endless flexible member disposed on the other bank side where the mounting space is formed is attached to the most other cylinder head side. The mounting space can be enlarged in the axial direction of the crankshaft.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a V-type DOHC engine showing an embodiment of the present invention.

FIG. 2 is a schematic plan view showing a V-type DOHC engine according to another embodiment of the present invention in a horizontal state.

[Explanation of symbols]

 2 V type DOHC engine 4 Cylinder block 6-1 One side cylinder bank 6-2 The other side cylinder bank 8-1 One side cylinder head 8-2 The other side cylinder head 10-1 One side head cover 10-2 The other side head cover 12 Oil Pan 14 Crankshaft 18 One-side camshaft for intake valve 20 One-side camshaft for exhaust valve 22 Other-side camshaft for intake valve 24 Other-side camshaft for exhaust valve 26 Space 38 Intermediate shaft 40 First endless flexible member 42 Second endless flexible member 44 Third endless flexible member

Claims (3)

(57) [Claims] 1. One side of a V-shaped cylinder block ,
One side to the other side cylinder banks, these one side with mounting the other side the cylinder head, one side of the respective two on the other side the cylinder head, the V-type DOHC engine to arrange the other camshaft, one side cylinder head
Located between two one-side cam shaft which is disposed
An intermediate shaft disposed in the cylinder head, two V-bank of the other camshaft being arranged on the other side the cylinder head
Side, intermediate shaft and crankshaft
A first endless flexible member is wound around the rocket, and the first endless flexible member is
Deflection provided to contact the other side cam shaft and the intermediate shaft and the crankshaft of the V-bank of a member, the V-bank
The other side between the camshaft and the crankshaft
A chain tensioner for applying tension to the first endless flexible member.
Two one-side camshafts provided on one side cylinder head and the first endless flexible member on the one side are provided.
Endless sprockets provided on the intermediate shafts
A flexible member is wound around, and one side camshaft and the intermediate shaft are provided in communication with each other by a second endless flexible member, and two other side camshafts provided on the other side cylinder head are connected to the first side . A V-shaped DOHC engine, wherein the V-shaped DOHC engine is provided in communication with three endless flexible members . 2. One side of a V-shaped cylinder block,
One side and the other side cylinder head on the other side cylinder bank
And the cylinder heads on one side and the other side.
And two camshafts on one side and the other, respectively.
V-shaped D with two camshafts oriented in the width direction of the vehicle
In the OHC engine, arranged on one side cylinder head
Located between two one-sided camshafts
Two heads arranged on the other cylinder head
V-bank side of the other camshaft, intermediate shaft and crankshaft
1st endless flexible to sprockets provided in each of the shafts
A member is wound around the first endless flexible member and the V bank is
Of the other side camshaft, intermediate shaft and crankshaft
Provided in communication with the other camshaft on the V bank side.
Tension on the first endless flexible member with the crankshaft
Provide a chain tensioner that gives
Two camshafts on one side And the other
Provided on the intermediate shafts on which the first endless flexible members on the side are provided, respectively.
Wrap the second endless flexible member around the sprocket
Side camshaft and intermediate shaft by a second endless flexible member
And the other cylinder head.
The two other camshafts are connected by a third endless flexible member.
And the other camshaft on the V bank side
And the first endless flexible member is wound around the intermediate shaft
The diameter of the sprocket is adjusted to the second endless flexible member and the third endless flexible member.
Larger than the diameter of the sprocket around which the flexible member is wound
So that one cylinder head is
V-shaped DOHC d
Carrot. 3. A first endless front of said third endless flexible member.
A flexible member disposed in front of the first endless flexible member;
The flexible member according to claim 2, wherein a flexible member is provided.
V-type DOHC engine.