JPH04246242A - Auxiliary driving structure of engine - Google Patents

Abstract

PURPOSE:To reduce the overall height of an engine by installing an auxiliary in reversal state in a dead space formed by the arrangement of a throttle body. CONSTITUTION:A timing belt 26 is arranged on one edge side of an engine 4. A throttle body 24 is arranged on one edge side of the engine 4. An auxiliary, e.g. alternator 28 is installed in reversal, in order to maintain a timing belt line in a dead space formed by the arrangement of the throttle body 24. Accordingly, the overall height of the engine 4 can be reduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accessory drive structure for an engine, and more particularly to an accessory drive structure for an engine in which a timing belt is disposed at one end.

0002

2. Description of the Related Art Engines include engines in which cylinders are connected in series, engines in which cylinders are connected in opposition, and V-type engines.

As shown in FIGS. 4 to 6, the V-type engine 104 has first and second cylinder heads 110-1 and 110-2 mounted on the upper surface of a V-shaped cylinder block 106.
and first and second cylinder head covers 112-1, 112
-2, respectively, to form V-shaped first and second cylinder banks 114-1 and 114-2.

[0004] The first part, which is the upper part of the V-type engine 104,
A space 116 is formed between the second cylinder banks 114-1 and 114-2. In this space 116, an intake manifold 118 and a cooling water inlet/outlet pipe 120, which are installed over the first and second cylinder heads 110-1 and 110-2, are arranged. Further, V of the space portion 116
An alternator 128 is provided at one end, which is the front side, of the V-type engine 104.
A throttle body 124 is disposed on the other end side which is the rear side of 04. By effectively utilizing this space 116, the V-type engine 104 is made more compact.

[0005] Other V-type engines include a cylinder block that accommodates two sets of cylinder rows connected in a V-shape at a predetermined bank angle, as disclosed in Japanese Patent Application Laid-Open No. 62-96737. The water pump and other auxiliary parts including driven pulleys are housed in the V valley in the center of the upper side.
A timing belt transmission system that connects the water pump and the crankshaft, and a belt transmission system that connects the auxiliary parts and the crankshaft were installed in this order in parallel against the wall of the cylinder block facing the timing belt.

Furthermore, the engine auxiliary drive structure includes:
As disclosed in Japanese Utility Model Application Publication No. 1-148031, in an engine equipped with an auxiliary machine driven by a crankshaft via a centrifugal variable pulley, a drive-side variable pulley with a centrifugal mechanism disposed on the side opposite to the engine is connected to the crankshaft. At the same time, a pulley that drives other accessories is installed on the engine side of the drive side variable pulley, and a centrifugal mechanism is placed on the engine side at a position away from the drive shaft of the accessory that is driven via the variable pulley. There is a type in which a driven variable pulley is provided, and an intermediate pulley is provided on the outer periphery of the centrifugal mechanism of the driven variable pulley for conductive connection with the drive pulley on the drive shaft.

[0007]

[Problems to be Solved by the Invention] Incidentally, auxiliary equipment for conventional engines, particularly V-type engines, such as alternators and throttle bodies, are disposed in the space between the first and second cylinder banks of the V-type engine. Ta.

As a result, when this V-type engine 104 is mounted in a compact engine room (not shown), the total height of the V-type engine 104 is limited by the height of the engine room (not shown). The alternator 128 and throttle body 124 are placed in the space 116.
The problem was that it was difficult to place the In addition, a muffler (not shown) is installed in this engine room 102.
, the V-type engine 104
By arranging the muffler (not shown) on both sides of the alternator 1 in the engine room (not shown),
28 and the throttle body 124 (not shown) cannot be formed, which is disadvantageous in practical terms.

[0009]

[Means for Solving the Problems] Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides an accessory drive structure for an engine in which a timing belt is disposed at one end of the engine, and a throttle body is provided at one end of the engine. In order to maintain the timing belt line, an auxiliary machine is installed in the dead space created by the arrangement of the throttle body in an inverted manner.

0010

[Operation] With the invention as described above, when attaching an auxiliary machine to an engine, the auxiliary machine is installed upside down in the dead space formed by arranging the throttle body at one end of the engine. This maintains the timing belt line and prevents the overall length of the engine from increasing.

[0011]

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

FIGS. 1 to 3 show an embodiment of the present invention. In FIG. 3, 2 is the engine room of the vehicle, 4
is a V-type engine. A V-type engine 4 is mounted in an engine compartment 2 of a vehicle (not shown). This V-type engine 4 has an oil pan 8 attached to the lower surface of a V-shaped cylinder block 6, and first and second cylinder heads 10-1 and 10-2 and first and second cylinder heads on the upper surface. Head covers 12-1 and 12-2 are placed thereon. The first cylinder head 10-1 and the first cylinder head cover 12-1 are arranged on one side (the left side in FIG. 3) of the V-type engine 4, and the second cylinder head 10-2 and the second cylinder head cover Head cover 12-
2 is arranged on the other side of the V-type engine 4 (on the right side in FIG. 3). The first and second cylinder heads 10-1, 10
-2, the first and second cylinder banks 14-1, which are cylinder banks on one side and the other side, form a V-shape.
, 14-2 are arranged.

[0013] The first and second cylinder banks 14-1,
A space 16 is formed between 14-2. In this space 16, the first and second cylinder banks 14-1
, 14-2, an intake manifold 18, a cooling water inlet/outlet pipe 20, and a crank angle sensor 22 are arranged.

Further, a throttle body 24 is disposed at one end of the V-type engine 4, and in the dead space S created by the arrangement of the throttle body 24, an auxiliary machine such as an alternator is installed to maintain the timing belt 26. 28 is provided by inverting it.

That is, the throttle body 24 is disposed above the crank pulley 30 disposed at one end of the V-type engine 4 so as to protrude toward one side of the V-type engine 4. At this time, there is a dead space S on both sides of the throttle body 24.
1, S2 appears.

In the dead space S1 on the lower side in FIG. The alternator 28 is reversed. This alternator 28 is fixed to the throttle body 24 by a first mounting bracket 34, and a second
It is fixed to one end portion of the V-type engine 4 by a mounting bracket 36.

Note that 38 is a starter, 40 is an exhaust manifold, and 42 is a muffler.

Next, the operation will be explained.

When attaching the alternator 28, which is an auxiliary device, to the V-type engine 4, the throttle body 24 is disposed above the crank pulley 30 disposed on one end side of the V-type engine 4, and the throttle body 24 The alternator 28 is inverted and installed in the dead space S1 formed by arranging the V-type engine 4, thereby maintaining the timing belt line of the V-type engine 4 and preventing an increase in the overall length of the V-type engine 4.

[0020] As a result, the overall height of the V-type engine 4 can be reduced, and the V-type engine 4 and the muffler 42 can be mounted in the compact engine room 2.
This is practically advantageous.

[0021] Also, alternator 2 is installed in the dead space S.
By arranging the auxiliary equipment such as No. 8, this dead space S can be effectively utilized, and wasted space around the V-type engine 4 can be reduced, which is advantageous in practice.

[0022]

As explained in detail above, according to the present invention, a throttle body is disposed at one end of the engine, and the dead space created by the arrangement of the throttle body is compensated for in order to maintain the timing belt line. Since the machine is installed upside down, the overall height of the engine can be reduced and the engine can be mounted in a compact engine room, which is advantageous in practice and allows effective use of dead space. .

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a V-type engine according to an embodiment of the invention.

FIG. 2 is a schematic left side view of the V-type engine.

FIG. 3 is a schematic front view of the V-type engine.

FIG. 4 is a schematic plan view of a V-type engine showing a conventional technique of the present invention.

FIG. 5 is a schematic right side view of the V-type engine.

FIG. 6 is a schematic front view of the V-type engine.

[Explanation of symbols]

2 Engine room 4 V type engine 6 Cylinder block 8 Oil pan 10 Cylinder head 12 Cylinder head cover 14 Cylinder bank 16 Space section 18 Intake manifold 20 Cooling water in/out pipe 22 Crank angle sensor 24 Throttle body 26 Timing belt 28 Alternator 30 Crank pulley 32　Alternator drive pulley 34 First mounting bracket 36 Second mounting bracket

Claims (1)

[Claims] Claim 1: In an engine accessory drive structure in which a timing belt is disposed at one end of the engine, a throttle body is disposed at one end of the engine, and a dead space created by the arrangement of the throttle body is filled with a timing belt. An auxiliary drive structure for an engine, characterized in that the auxiliary equipment is installed inverted to maintain the belt line.