JPH0115871Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a drive device for auxiliary equipment in a V-type multi-cylinder engine, and particularly relates to a drive device for auxiliary equipment that is rotationally driven by the engine itself. It is related to the device.

(Conventional technology) Engines include water pumps, fuel pumps,
Many auxiliary machines, such as alternators, are provided that require rotational drive. For small engines,
Typically, such accessories are driven by the engine itself. Furthermore, in the case of an automobile engine, other components such as a power steering oil pump and a cooler compressor are also rotationally driven by the engine. In that case, a belt pulley or the like is usually attached to the end of the crankshaft, and these auxiliary machines are driven via a transmission device such as a belt transmission mechanism.

On the other hand, V-type multi-cylinder engines, which can reduce the axial length and vertical height of the crankshaft, are increasingly being used for large-displacement automobile engines that require high output. . In such a V-shaped multi-cylinder engine, a pair of banks are arranged in different steps, and the end face of one bank is set back inward from the end face of the engine body, but normally the bank on the retreating side is The ends are considered dead spaces.

(Problem to be solved by the invention) By the way, if all of the auxiliary equipment rotated by the engine were to be driven by the crankshaft, it would be necessary to attach a large number of belt pulleys, etc. to the crankshaft. This increases the overall length of the engine by the thickness of the pulley, etc. Additionally, if the length of the drive belt, etc. that transmits rotational force to the auxiliary equipment becomes longer, problems such as elongation due to the tension will occur and the transmission efficiency will decrease, so these auxiliary equipment should be installed as close to the engine body as possible. However, when a large number of auxiliary machines are driven by the crankshaft, those auxiliary machines will be concentrated at one end of the engine body, which limits the layout of the auxiliary machines and They will have to be placed so that they overlap. This makes maintenance work on the auxiliary equipment difficult. Particularly in the case of a V-type multi-cylinder engine, even if the auxiliary equipment is placed on the side of the engine body, the auxiliary equipment will be located below the bank, making maintenance work extremely difficult. .

Furthermore, some auxiliary machinery cannot be rotated very high, but if you try to drive such auxiliary machinery with the crankshaft, the speed between them will increase in the case of a high-revving engine. It is necessary to provide a special reduction gear.

The present invention was developed in view of these problems, and its purpose is to shorten the length of the drive belt that rotates the auxiliary equipment, and to make the auxiliary equipment easier to maintain. The purpose of the present invention is to arrange the engine in the upper part of the engine body where it can be easily installed, and to make the entire engine compact.

Another object of the present invention is to enable auxiliary machinery to be driven without complicating the structure of the engine.

(Means for Solving the Problem) In order to achieve this objective, the present invention provides an overhead cam type V-type multi-cylinder engine.
An auxiliary machine is arranged between banks of the engine, and the auxiliary machine is rotationally driven by a drive member such as a belt pulley attached to a camshaft via a transmission member such as a toothed belt. The auxiliary drive member such as the belt pulley is provided at the end of the bank on the side that is retreated inward from one end surface of the engine main body in the crankshaft axial direction.

(Function) In a V-type multi-cylinder engine, a space is formed between both banks that is open toward the top of the engine. Therefore, if an auxiliary machine is installed there, the space can be used effectively, and the maintenance of the auxiliary machine becomes easy. By rotating the auxiliary equipment by means of a camshaft installed in the cylinder head near the installation position,
The length of the belt etc. for driving it can also be shortened.

In addition, by installing auxiliary equipment drive members such as belt pulleys for rotationally driving auxiliary equipment by the camshaft at the end of the bank that is set back inward from the end face of the engine body, dead space can be reduced. can be used effectively, and an increase in the overall length of the engine can be prevented.

Furthermore, since the camshaft rotates at half the rotation speed of the engine, the auxiliary equipment driven by the camshaft will rotate at a low speed, so there is no need to use a reducer etc. even in the case of low-speed auxiliary equipment. It disappears.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

The figure shows one embodiment of an auxiliary drive device according to the present invention, and FIGS. 1 and 2 are a schematic front view and a schematic plan view, respectively, of an engine equipped with the auxiliary drive device. FIG. 3 is an enlarged view of the camshaft portion where the auxiliary drive device is provided.

As is clear from Figure 1, this engine E
is a V-type multi-cylinder engine in which a pair of banks 1 and 2 are arranged in a V shape, and each bank 1,
Each of the two cylinder heads 3, 4 is provided with a separate camshaft 5, 6, 7, 8 for opening and closing an intake valve and an exhaust valve. That is, it is equipped with a double overhead cam mechanism.

As is clear from FIGS. 2 and 3, at one end of each camshaft 5, 6, 7, 8, that is, at the left end in the figure, the camshafts 5 to 8 are
Driven pulleys 9, 9, . These driven pulleys 9,
9, . . . are adapted to be driven by a crankshaft 11 via a toothed belt 10.

End face 3 of each cylinder head 3, 4 on the opposite side from the side where the driven pulleys 9, 9, ... are provided
a, 4a, since this engine E is a V-type multi-cylinder engine, one end surface 3a is the other end surface 4a.
It is recessed in a different step from a. That is, the end surface 3a of the cylinder head 3 of one bank 1 is set back inward from one end surface of the main body of the engine E in the direction of the crankshaft axis. The camshafts 5 and 6 of the bank 1 on the retreated side are configured such that their end portions 5a and 6a protrude from the cylinder head end surface 3a. A distributor 12 is attached to the end surface 3a of the cylinder head 3 on the extension axis of a camshaft 6 located inside, and the distributor 12 is directly rotationally driven by the protruding end 6a of the camshaft 6. It is becoming more and more common.

A belt pulley 13, which is an auxiliary drive member, is attached to a portion of the camshaft 6 between the distributor 12 and the cylinder head end face 3a. On the other hand, as shown in FIGS. 1 and 2, in the space S formed between banks 1 and 2, auxiliary equipment 14 that needs to be rotated, such as pumps or alternators, is installed. has been done. The auxiliary machine 14 is supported by a bracket 16 erected on the cylinder block 15 with its axis of rotation separated from the axis of rotation of the camshaft 6. It is adapted to be rotationally driven via a belt 17.

Further, the protruding end 5a of the other camshaft 5 rotates instruments 18 such as a crank angle sensor and an engine revolution meter.

With this configuration, when the engine E is operated, each camshaft 5, 6, 7, 8 is rotated by the crankshaft 11 via the toothed belt 10 and the driven pulley 9. As a result, the belt pulley 13 attached to the camshaft 6 rotates, and the auxiliary machine 14 is rotationally driven via the toothed belt 17. In this case, since the camshaft 6 is located close to the space S between banks 1 and 2, the auxiliary equipment 1 installed in that space S
4 is short. Therefore, the driving belt 17 is short, and its transmission efficiency is improved. Furthermore, since the auxiliary machine 14 is installed above the engine E, maintenance work is also facilitated.

Furthermore, the camshaft 6 is connected to the crankshaft 11.
The auxiliary machine 14 is rotated at a relatively low speed even when the engine E rotates at a high speed. Therefore, even if the auxiliary machine 14 cannot withstand high rotation, there is no need for special deceleration. Even if it slows down,
The reduction ratio may be small.

Moreover, in this way, the end 6a of the camshaft 6 is made to protrude from the end face 3a of the cylinder head 3 on the side that has retreated inward, and the auxiliary machine 14 is driven by the belt pulley 13 attached to the protruding end 6a. By doing so, the seal of the cylinder head 3 only needs to be the part that passes through the camshaft 6, and a seal with a simple structure can be used, and the overall length of the engine can be avoided due to the auxiliary drive pulley 13. It can be prevented.

Furthermore, since the auxiliary machine 14 is rotationally driven via a belt 17 that is separate from the camshaft 6, the rotational axis of the auxiliary machine 14 can be placed apart from the rotational axis of the camshaft 6, and the rotation axis between the banks 1 and 2 can be Coupled with the large space S, the degree of freedom in the layout of the auxiliary equipment 14 also increases.

In the above embodiment, the engine E is equipped with a double overhead cam mechanism, but it is also possible to use a V-type multi-cylinder engine in which the intake and exhaust valves are operated by a single overhead camshaft. Even if it is, it can be configured in the same way.

Further, although the auxiliary machine 14 is assumed to be driven by a belt, it can also be driven by a gear mechanism or the like.

(Effects of the invention) As is clear from the above explanation, according to the invention, the auxiliary equipment is arranged between both banks of the V-type multi-cylinder engine, so the entire engine can be made compact. At the same time, maintenance work for the auxiliary equipment can be facilitated.
Moreover, since the engine is an overhead cam type engine, and the auxiliary equipment is rotationally driven by the camshaft, the transmission members such as belts for driving the auxiliary equipment can be shortened, and the transmission Efficiency can be increased.

In addition, the auxiliary equipment drive member for rotationally driving the auxiliary equipment is provided at the end of the bank on the side that is set back inward from the end face of the engine body, so the length of the engine in the crankshaft axial direction is In addition, it is possible to prevent the auxiliary machinery from being concentrated on one side of the engine body. Since the auxiliary machine is rotationally driven via a transmission member such as a belt, it can be installed at any position between both banks, and the degree of freedom in its layout increases.

Furthermore, the auxiliary equipment is driven by a camshaft that rotates at 1/2 the engine speed, allowing the use of inexpensive low-speed auxiliary equipment without the need for a special reduction gear. I can do it. Moreover, since the rotation speed is proportional to the engine rotation speed, even auxiliary equipment that needs to be synchronized with the engine can be driven. And since the camshaft is always installed in the engine,
The structure of the engine does not become complicated.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing an embodiment of a V-type multi-cylinder engine equipped with an auxiliary drive device according to the present invention, FIG. 2 is a schematic plan view of the engine, and FIG.
The figure is an enlarged longitudinal sectional view showing the camshaft portion of the engine. 1, 2... Bank, 3, 4... Cylinder head, 5, 6, 7, 8... Camshaft, 5a, 6
a... Protruding end of camshaft, 9... Driven pulley, 11... Crankshaft, 13... Belt pulley (auxiliary machine driving member), 14... Auxiliary machine, 1
7...Toothed belt (transmission member), E...V-type multi-cylinder engine, S...Space between banks.

Claims (1)

[Claims for Utility Model Registration] In an overhead cam type V-type multi-cylinder engine in which a pair of banks are arranged in a V-shape and a camshaft is provided at the cylinder head of each bank; an auxiliary machine that is rotatably driven by the camshaft, and an auxiliary machine driving member for rotationally driving the auxiliary machine by the camshaft via a separate transmission member. An auxiliary drive device for a V-type multi-cylinder engine, characterized in that it is provided at an end of a bank on a side that is set back inward from an end surface of an engine body in the direction of a crankshaft axis.