JPH09329033A - Interlocking device for engine component of multicylinder engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduced a size of an engine configuration in the case an engine component is interlocked and connected to a crankshaft of a main body of an engine via an interlocking means. SOLUTION: Both ends of a crankshaft 8 are supported on a crank case 2. This crankshaft 8 comprises a crank main shaft 12, a crank arm 13 projecting outward in the radial direction from this crank main shaft 12 and a crank pin 14 which is respectively supported on a projecting end of each crank arm 13 to be provided on each cylinder 3. A piston 17 of each cylinder 3 and a connecting rod 18 for connecting a crank pin 14 to the corresponded piston 17 are provided. To the crankshaft 8, an engine components part 1b is interlocked and connected via an interlocking means 33. The engine components part 1b is interlocked and connected via the interlocking means 33 to a part 12a of the crank main shaft 12 between both crank pins 14 adjacent to each other in the axial direction of the crankshaft 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crankshaft of a multi-cylinder engine (internal combustion engine) and a camshaft of a valve mechanism and / or
Alternatively, the present invention relates to an engine component interlocking device for a multi-cylinder engine in which engine components such as auxiliaries are interlockingly connected.

[0002]

2. Description of the Related Art A multi-cylinder engine is usually composed of an engine body and engine components. The engine body includes a crankcase and a crankshaft supported by the crankcase. On the other hand, the engine component is It is equipped with a camshaft of a valve mechanism and auxiliary equipment such as an alternator.

The engine components are interlockingly connected to the crankshaft of the engine body through interlocking means to interlock with the driving of the engine body, whereby the engine is operated.

In the above case, as a first conventional technique, the interlocking means has an intermediate shaft coaxially arranged with the crankshaft and juxtaposed to the crankshaft, and the intermediate shaft is interlockingly connected to the crankshaft. In some cases, the above-mentioned engine components are interlockingly connected to the intermediate shaft.

As a second conventional technique, a meshing tooth is formed on the outer peripheral surface of the crank arm of the crankshaft, and this gear serves as a gear, and this gear constitutes a part of the interlocking means. There is one in which the above engine components are interlocked and connected.

[0006]

By the way, according to the first conventional technique, the crankshaft of the engine body and the intermediate shaft of the interlocking means are arranged side by side in the axial direction. The engine becomes long and large, which is not preferable because it becomes an obstacle when the engine is installed in a narrow space such as a vehicle or a ship.

Further, according to the second conventional technique, since the crank arm projects radially outward from the crank spindle, the gear having meshing teeth formed on the outer peripheral surface of the crank arm. The outer diameter dimension of is large. Therefore, it is necessary to obtain a desired reduction gear ratio (for example, 1: 1) between the driven gear and the gear on the driven side, and the outer diameter of the gear on the driven side also becomes large.

Therefore, there is a possibility that the engine may become extremely large in the radial direction of the crankshaft, and this also
As in the case of the first conventional technique, it is not preferable because it becomes an obstacle when the engine is installed in a narrow space such as a vehicle or a ship.

The present invention has been made by paying attention to the above circumstances, and in the case where engine components are interlockingly connected to the crankshaft of the engine body through interlocking means, the shape of the engine is made smaller. The task is to let

Further, even in the case of the above, it is another object to improve the degree of freedom in the arrangement of the engine components which are interlocked with the crankshaft.

[0011]

An engine component interlocking device for a multi-cylinder engine according to the present invention for achieving the above object is as follows.

According to the first aspect of the present invention, the crankcase 2 supports the crankshaft 8 at both ends thereof, the crankshaft 8 and the crank arm 12, and the crank arm 13 projecting radially outward from the crank main shaft 12. Each of the cylinders 3 has a crank pin 14 which is supported by a protruding end of each crank arm 13 and is provided for each cylinder 3.
Piston 17 and the corresponding crank pin 1
4 is provided with a connecting rod 18 for connecting the crankshaft 8
When the engine component 1b is interlocked with the crankshaft 8 through the interlocking means 33, the interlocking means 33 is intervened in the portion 12a of the crank main shaft 12 between the crankpins 14 adjacent in the axial direction of the crankshaft 8. The engine component 1b is interlocked and connected.

According to a second aspect of the present invention, in addition to the first aspect of the invention, the interlocking means 33 is an intermediate shaft 34 supported by the crankcase 2 and extending parallel to the crankshaft 8.
A winding transmission means 37 for interlockingly connecting the intermediate shaft 34 to the portion 12a of the crank main shaft 12 is provided, and the engine component 1b is interlockingly connected to the intermediate shaft 34.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In the drawings, reference numeral 1 is a 4-cycle in-line multi-cylinder (6-cylinder) engine (internal combustion engine) mounted on an automobile. In addition, the right and left described below means a direction toward FIG. 2.

The engine 1 is composed of an engine body 1a and an engine component 1b. The engine body 1a has a crankcase 2 made of aluminum casting. First to sixth cylinders (cylinders) 3 are arranged side by side on the upper surface side of the crankcase 2. Each of these cylinders 3 has a cylinder body 4 protruding from the crankcase 2, and these cylinder bodies 4 are integrated with each other to form a cylinder block 5 made of aluminum. A cylinder head 7 made of cast aluminum is detachably fastened to the protruding end of the cylinder body 4.

A crankshaft 8 is provided in the crankcase 2.
Is housed. The crankshaft 8 has its axial center 9 extending to the left and right, and both ends and an intermediate portion are supported by the crankcase 2 by bearings so as to be rotatable around the axial center 9. The crankshaft 8 is made by forging, machining, or casting, and is located on the shaft center 9 and is directly supported by the bearing, and the crankshaft 12 projects outward from the crankshaft 12 in the radial direction. A pair of crank arms 13 is provided for each cylinder 3, and a crank pin 14 provided for each cylinder 3 is supported by the protruding ends of the pair of crank arms 13. The crank arm 13 has a function of supporting the crank pin 14 and a function of a counter weight.

Each cylinder body 4 has a cylinder hole 16, and a piston 17 is provided in each cylinder hole 16.
Is slidably fitted in the axial direction, and the piston 17 of each cylinder 3 and the corresponding crank pin 14 of the crank shaft 8 are interlockingly connected by a connecting rod 18.

The cylinder body 4, the cylinder head 7,
And the cylinder head 7 in the space surrounded by the piston 17
The side is a combustion chamber 19. Further, the combustion chamber 19 is provided with an ignition plug 20 facing the discharge part 20a.

The cylinder body 4 and the cylinder head 7 have a cooling water passage 2 through which cooling water for the engine 1 is cooled.
1 is formed.

An intake passage 23 is formed in the cylinder head 7 for communicating the outside of the cylinder 3 with the combustion chamber 19, and an exhaust passage 24 is formed for communicating the combustion chamber 19 with the outside of the cylinder 3.

A throttle valve 22 is attached to the upstream end of the intake passage 23 via an intake pipe, and an intake valve 25 for opening and closing an opening of the intake passage 23 to the combustion chamber 19 is provided.
Is supported by the cylinder head 7, and the intake valve 25 is biased by a spring so as to close the opening. Also,
An exhaust valve 26 that opens and closes an opening of the exhaust passage 24 to the combustion chamber 19 is supported by the cylinder head 7, and the exhaust valve 26 is also biased by a spring so as to close the opening. A fuel injection valve 27 is attached to the cylinder head 7, and the fuel injection valve 27 can inject fuel 28 toward the combustion chamber 19 through the intake passage 23.

The engine component 1b is provided with a valve operating mechanism 29 for opening the intake valve 25 and the exhaust valve 26 against the respective springs, and the valve operating mechanism 29 includes the intake valve 25 and the exhaust valve. Cam shaft 3 cam-engaged with each valve 26
It has 0 and 31. Each of the cam shafts 30 and 31 has its axis extending to the left and right, and is supported by the cylinder head 7 so as to be rotatable around the axis.

The camshafts 30 and 31 are interlocked with the crankshaft 8 through interlocking means 33. In this case, both crankpins 1 adjacent to each other in the axial direction of the crankshaft 8
The camshaft 3 is attached to the portion 12a of the crankshaft 12 between the Nos. 4 and 14 (denoted by reference numeral A) via the interlocking means 33.
0 and 31 are linked and linked.

The interlocking means 33 has an intermediate shaft 34 extending parallel to the crankshaft 8. The intermediate shaft 34 is supported by the crankcase 2 by bearings so as to be rotatable about its axis 35. . The intermediate shaft 34 includes an intermediate shaft main body 34a which is directly supported on the crankcase 2 on the axial center 35, and the same axial center 35 as the intermediate shaft main body 34a.
The intermediate shaft body 34a is provided with a boss portion 34b which is press-fitted and fixed thereto.

The interlocking means 33 serves as the crank spindle 1.
The second portion 12a has a chain type winding transmission means 37 for interlockingly connecting the boss portion 34b of the intermediate shaft 34. The winding transmission means 37 is the portion 1 of the crank spindle 12.
2a, a driven sheave 38, a driven sheave 39 formed on the boss portion 34b in a part of the intermediate shaft 34 in the axial direction, and a drive sheave 38 and a driven sheave 39 wound around the driven sheave 39. And a chain 40 that is formed. The drive chain wheel 38 and the driven chain wheel 39 have the same pitch circles. Further, a chain tensioner 41 that gives an appropriate tension to the chain 40 is provided.

The interlocking means 33 is the intermediate shaft 3
Interlocking shaft 4 which is a jack shaft provided in parallel with 4
3, and another chain-type winding transmission means 42 for interlockingly connecting the interlocking shaft 43 to the intermediate shaft 34.
The interlocking shaft 43 is supported by the cylinder head 7 of the cylinder 3 so as to be rotatable around its axis. The other winding transmission means 42 is the drive chain wheel 4 formed on the boss portion 34b at the other axial portion of the intermediate shaft 34.
4 and a driven chain wheel 4 formed at one end of the interlocking shaft 43.
5 and a chain 46 wound around the drive chain wheel 44 and the driven chain wheel 45.

Further, the above-mentioned interlocking means 33 is the interlocking shaft 4 described above.
3 further includes another winding transmission means 47 for interlockingly connecting the cam shafts 30 and 31. The other winding transmission means 47 includes drive chain wheels 48 formed on the other end of the interlocking shaft 43, driven chain wheels 49 formed on the cam shafts 30 and 31, and drive chain wheels 48. And the driven chain wheel 49,
49 and a chain 50 wound around it.

In the above case, each winding transmission means 37, 42,
47 is a drive chain wheel 38, 44, due to thermal expansion of each cylinder 3.
Even if the dimension between the drive chain 48 and the driven chain wheels 39, 45, 49 changes, the bending of the chains 40, 46, 50 absorbs the change in the dimension and smoothly transmits the power. The generation of noise is prevented.

The engine component 1b is a water pump 5 for supplying cooling water to the cooling water passage 21.
Two. The water pump 52 is connected so as to interlock with the chain 46 of the other winding transmission means 42. Further, the engine component 1b of the same as above, the bearing,
An oil pump 53 for supplying lubricating oil is provided in a lubricated portion of the engine 1 such as a sliding contact portion between the cylinder hole 16 and the piston 17, and the oil pump 53 is provided by the interlocking means 33 by the crankshaft. The twelve portions 12a are interlocked and connected. That is, the drive gear 55 is formed on the boss portion 34b of the intermediate shaft 34, and the driven gear 56 which is the input portion of the oil pump 53 is meshed with the drive gear 55 in the worm gear type.

The engine component 1b includes an alternator 60, which is an auxiliary machine of the engine 1, a power steering pump 61, and an air conditioner compressor 62. These auxiliaries are interlocked with the portion 12a of the crankshaft 12 by the interlocking means 33. The interlocking means 33 includes a belt-type winding transmission means 64 for interlockingly connecting the respective auxiliary machines to the intermediate shaft 34, and the winding transmission means 64 is a drive rotor attached to an end portion of the intermediate shaft 34. Drive pulley 65, each driven pulley included in each of the above-mentioned auxiliary machines 59, and V belt 6 wound around these drive pulley 65 and each driven pulley.
6. Further, an idler that gives a proper tension to the V belt 66 is provided.

During operation of the engine 1, the camshafts 30 and 31 are interlocked with the crankshaft 8 via the interlocking means 33, and the intake valve 25 and the exhaust valve 26 are cam-engaged with the camshafts 30 and 31. Opens and closes at a predetermined crank angle. As a result, the air 7 on the atmosphere side passes through the intake passage 23.
1 is sucked into the combustion chamber 19, and at this time, the fuel 28 injected by the fuel injection valve 27 is also sucked into the combustion chamber 19 to generate the air-fuel mixture.

Next, the air-fuel mixture is ignited and burned by the spark plug 20, and the combustion heat is converted into motive power,
This power is output via the crankshaft 8. On the other hand, the combustion gas generated by the combustion is discharged from the exhaust passage 24 to the outside of the cylinder 3 as the exhaust gas 72.

The power from the crankshaft 8 is transmitted to the drive wheels via the power transmission means, whereby the automobile is driven. Along with this, the interlocking means 33
A water pump 52 is interlocked with the crankshaft 8 via the water pump 52, and cooling water is supplied to the cooling water passage 21 by the water pump 52, and the engine 1 is water-cooled to prevent the piston 17 from burning.

Further, the same as the above-mentioned interlocking means 3 with the crankshaft 8.
The oil pump 53 is interlocked via 3 and the lubricating oil is supplied to the lubricated portion of the engine 1 by the oil pump 53, and the piston 17 is prevented from being burned.

Further, the same as the above-mentioned interlocking means 3 with the crankshaft 8.
The respective auxiliary machines are interlocked with each other via 3, so that the respective auxiliary machines perform a predetermined operation.

According to the above construction, the engine component 1b is interlocked with the portion 12a of the crank main shaft 12 between the crankpins 14 (A) adjacent to each other in the axial direction of the crankshaft 8 via the interlocking means 33. It is connected.

That is, when the engine component 1b is interlocked with the crankshaft 8 via the interlocking means 33, the midway portion of the crankshaft 8 in the axial direction is used. The engine 1 becomes smaller in the axial direction as compared with the conventional one in which the intermediate shaft of the interlocking means is arranged in parallel to the crankshaft 8 in the axial direction, and as a result, the engine 1 is generally limited to a narrow space. The engine 1 can be mounted horizontally in the engine room.

When the engine component 1b is interlocked with the crankshaft 8 via the interlocking means 33 as described above, the crankshaft 12 having a smaller outer diameter than the crank arm 13 is used in the crankshaft 8. Therefore, for this reason, the crank arm 13 having a large outer diameter dimension is used.
The interlocking means 33 can be made smaller than in the conventional case in which the above is used as a component of the interlocking means.

Therefore, the engine 1 can be made smaller by that amount in the radial direction of the crankshaft 8. Further, since the meshing teeth are not formed on the crank arm 13 as in the conventional case, the function of the crank arm 13 as a counter weight is kept excellent.

The interlocking means 33 is supported by the crankcase 2 and extends in parallel with the crankshaft 8, and the intermediate shaft 34 is connected to the crankshaft 12.
And a winding transmission means 37 for interlockingly connecting to the portion 12a of the above, and the engine component 1b is interlockingly connected to the intermediate shaft 34.

Therefore, in the axial direction of the crankshaft 8,
Regardless of the position of the engine component 1b, if the engine component 1b is interlocked with the intermediate shaft 34, the engine component 1b is interlocked with the crankshaft 8 via the interlocking means 33. Can be made.

Therefore, the interlocking means 3 with respect to the crankshaft 8
The degree of freedom in the arrangement of the engine component 1b in the case of interlocking the engine component 1b via 3 is improved, and the engine component 1b can be provided at a more desired position.

Although the above is based on the illustrated example, the engine 1 may be mounted on a motorcycle, a ship or the like, or may be a two-cycle engine.

[0045]

The effects of the present invention are as follows.

According to the first aspect of the present invention, the crankcase supports both ends of the crankshaft, the crankshaft, the crankshaft, the crankarms projecting radially outward from the crankshaft, and the projecting ends of the crankarms. And a crank pin provided for each cylinder and supported by each of the cylinders, a connecting rod for connecting the piston of each cylinder and the corresponding crank pin is provided, and an engine component through the interlocking means on the crank shaft. In the engine component of the multi-cylinder engine in which the engine component is interlocked, the engine component is interlocked via the interlocking device to the crankshaft portion between the crankpins adjacent in the axial direction of the crankshaft. is there.

That is, when the engine constituent parts are interlocked with the crankshaft via the interlocking means, the middle part in the axial direction of the crankshaft is used, and therefore, the crankshaft is connected to the crankshaft for the interlocking operation. The engine can be made smaller in the axial direction as compared with the conventional case in which the intermediate shaft of the interlocking means is arranged in parallel in the axial direction.

As a result, for example, the engine can be laterally mounted in the engine room of an automobile, which is generally a narrow space.

When the engine components are interlocked with the crankshaft via the interlocking means as described above, the crankshaft uses the crankshaft having a smaller outer diameter than the crankarm. The interlocking device of the present invention can be made smaller than the conventional one, in which a crank arm having a large outer diameter is used as a component of the interlocking device.

Therefore, the engine can be made smaller in the radial direction of the crankshaft. Further, since the meshing teeth are not formed on the crank arm as in the conventional case, the function of the crank arm as a counter weight is kept excellent.

According to a second aspect of the present invention, the interlocking means is an intermediate shaft supported by the crankcase and extending parallel to the crankshaft, and a winding transmission means for interlockingly connecting the intermediate shaft to a portion of the crankshaft. And the engine component is interlockingly connected to the intermediate shaft.

Therefore, no matter which position the engine component is arranged in the axial direction of the crankshaft, if this engine component is interlocked and connected to the intermediate shaft, the engine component will act as interlocking means. It can be interlockingly connected to the above crankshaft.

Therefore, the degree of freedom in the arrangement of the engine components when the engine components are interlocked with the crankshaft via the interlocking means is improved, and the engine components can be provided at more desired positions. .

[Brief description of drawings]

FIG. 1 is a side view of an engine.

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

[Explanation of symbols]

 1 Engine 1a Engine Body 1b Engine Components 2 Crankcase 3 Cylinder 8 Crankshaft 9 Shaft Center 12 Crank Spindle 12a Part 13 Crank Arm 14 Crank Pin 17 Piston 18 Connecting Rod 30, 31 Camshaft 33 Interlocking Means 34 Intermediate Shaft 37 Winding Transmission means 52 Water pump 53 Oil pump 60 Alternator 61 Power steering pump 62 Air conditioner compressor

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area F02B 67/10 F02B 67/10

Claims (2)

[Claims] 1. A crankcase supports both ends of a crankshaft, the crankshaft being supported by a crankshaft, a crankarm projecting radially outward from the crankshaft, and projecting ends of the crankarms. It is composed of a crank pin provided for each cylinder, a connecting rod for connecting the piston of each cylinder and the corresponding crank pin is provided, and the engine component parts are interlocked and connected to the crank shaft through interlocking means. In an engine component of a multi-cylinder engine, an engine of a multi-cylinder engine in which the engine component is interlockingly connected to the crank spindle portion between both crank pins adjacent in the axial direction of the crank shaft via the interlocking means. Component interlocking device. 2. The interlocking means includes an intermediate shaft supported by the crankcase and extending parallel to the crankshaft, and a winding transmission means for interlockingly connecting the intermediate shaft to a portion of the crank spindle. The engine component interlocking device for a multi-cylinder engine according to claim 1, wherein the engine component is interlockingly connected to an intermediate shaft.