JPS6296737A - V-type engine - Google Patents

Abstract

PURPOSE:To reduce the number of belt driving systems and aim at reduction in manufacturing cost or the like by installing a timing belt driving system connecting an interval between a water pump and a crankshaft and a belt driving system connecting an interval between accessory parts and the crankshaft parallely in this ourder. CONSTITUTION:An engine is provided with two sets of cylinder rows where cylinders S are disposed three by three in series, and each of banks L and R housing these cylinder rows is coupled together in a V-shaped form at the specified banking angle. In this case, a pair of cam shafts 9 and 10 are projected out of the belt opposed wall 8 formed at the one end side of a V-root part 3, and a timing belt is rolled on these shafts together with a water pump 13, forming a driving system C. In addition, both first and second belt driving systems D and E are parallely installed in this belt opposed wall 8 in this order in addition to the driving system C. That is to way, the driving system D drives a power steering pump 19 and an alternator 22 while the driving system E drives a cooler compressor 26 or the like by belt each to a crankshaft 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an OHC-type engine, particularly a V-type engine in which a valley is formed in the center of the upper side.

(Prior Art) A V-type engine is known in which two sets of cylinder rows are arranged in a figure-7 shape at a predetermined bank angle among a cylinder block that accommodates a plurality of cylinders. This engine often has a V-trough, which is a substantially V-shaped recess, formed at the center of the upper side and extending in the direction of the cylinder row. Furthermore, one end of the trough is a vertical wall for mounting auxiliary equipment, from which the crankshaft is placed in a protruding state. Furthermore, engine auxiliary parts including a driven pulley using a crankshaft as a drive source are attached to this vertical wall, and these are driven by a belt transmission system.

By the way, in a type 2 engine that uses the OHC system, the crankshaft not only drives a pair of camshafts via a timing belt transmission system, but also drives various engine auxiliary parts. These auxiliary parts include essential auxiliary equipment such as water pumps and alternators, as well as cooler compressors and power steering pumps (hereinafter simply referred to as power steering pumps), and their number tends to increase as vehicles become more sophisticated. .

(Problem to be Solved by the Invention) In vehicle models with a large number of auxiliary parts, belt transmission systems are installed in parallel in multiple stages in order to drive the large number of auxiliary parts installed by the crankshaft. There are problems in that the multi-stage transmission system increases the cost, increases the length of the engine in the crankshaft direction, that is, the cylinder row direction, and reduces the ease of installation.

The object of the present invention is to provide a V
The objective is to provide a type engine.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention includes a cylinder block that accommodates two sets of cylinder rows connected in a V-shape, and a cylinder block that accommodates two sets of cylinder rows connected in a V-shape. A timing belt transmission system that accommodates the water pump and other auxiliary parts including driven pulleys, 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 in this order. The structure is such that the timing belts are sequentially arranged in parallel to the wall of the cylinder block facing the timing belt.

(Effect) ■In addition to housing the water pump in the valley, its pulley is
The crankshaft is driven by two camshafts and a timing belt transmission system. For this reason, the number of belt transmission systems used to drive auxiliary parts equipped with driven pulleys other than the water pump can be relatively reduced, thereby reducing costs. The length in the cylinder row direction is relatively reduced, making it easier to mount the engine.

(Example) The V-type engine shown in Figures 1 and 2 has 6 cylinders.
The engine is a C engine, and has two cylinder rows in which each cylinder S is divided into three cylinders, and each cylinder row is arranged in series. And each center line Q of the left and right banks L and R that accommodate the left and right cylinder rows.1. Q2 intersects the centerline Q3 of the crankshaft 1, and the bank angle α, which is the opposing angle therebetween, is determined to be 60° here.

The cylinder block 2 that accommodates these two sets of cylinder rows has a substantially ■-shape when viewed from the front, and has a V valley portion 3 that is long in the cylinder row direction A and is a substantially V-shaped space in the upper center part. is formed.

Cylinder heads 4.5 and rocker covers 6.7 corresponding to three cylinders are attached to the upper ends of the left and right banks L and R of the cylinder block 2, respectively.

A vertical belt-facing wall 8 is formed at one end of the trough portion 3 on the front side of the cylinder head 2, from which a pair of camshafts 9 and 10 protrude in addition to the crankshaft 1. Moreover, the left and right cam sprockets 1 are integrated with the camshafts 9 and 10.
1. In addition, the pulley 14 of the water pump 13 and the idle pulley 31 for tension adjustment, which are located in the middle of A timing belt transmission system C that rotates together with a crank sprocket 16 is formed.

Note that this timing belt transmission system C is housed in a space between the belt opposing wall 8 and a belt cover (indicated by a two-dot chain line) 17 superposed and fixed thereto. In addition, the water pump 13 is installed with a straight water pipe 30 housed in the valley 3.
The cooling water is formed to flow in from the radiator side (not shown) through the radiator, and to branch and discharge the cooling water to water jackets (not shown) in the left and right banks L and R.

In addition to the timing belt transmission system C, the belt opposing wall 8 is equipped with a timing belt transmission system C.
The first and second belt transmission systems E are arranged in parallel in this order. That is, as shown in FIGS. 2 and 3, the first and second belt transmission systems, E, are both connected to a crank pulley 18 (which has two V-grooves in parallel) that are integrated with a crankshaft l as a drive source. (which rotates integrally with the crank sprocket 16). In the first belt transmission system, the pulley 20 of the power steering pump 19 is housed together with the water pump 13 in the valley 3, and the alternator 22 is housed in the side space 21 at the bottom of the right bank R side wall of the cylinder block 2. The pulley 23 is driven by the first V-belt 24. Similarly, in the second belt transmission system E, the pulley 27 of the cooler compressor 26 and the idler pulley 28 for tension adjustment, which are housed in the side space 25 at the bottom of the side wall of the left bank of the cylinder block 2, are driven by the second belt 29. Ru.

Note that the left and right side spaces 21 and 25 are dead spaces, similar to ■trough 3, when viewed from the engine outline, so even if you install one auxiliary part each, or in some cases multiple auxiliary parts, When the engine is mounted, the length in the width direction B hardly increases.

In this way, the V-type engine shown in FIG. In the second belt transmission system, the number of auxiliary parts with driven pulleys that E has is reduced,
Moreover, it is also facilitated to arrange each auxiliary component in the dead space around the engine block 2, which is the space 21.25 on the left and right sides of the trough 3 degrees. For this reason, although it is an OHC type V-type engine, water pump 13. alternator 22
゜In addition to the timing belt transmission system C, four auxiliary parts, namely the cooler compressor 26 and the power steering pump 19, are connected to the two primary belt transmission systems. It can be easily driven simply by using the second belt transmission system, E. In particular, since the driven pulleys of the two first and second belt transmission systems E can be conveniently arranged, there is an advantage that the number of idle pulleys required is relatively small. Moreover, since the number of belt transmission systems can be reduced,
In addition to reducing costs, the length in the cylinder row direction A when the engine is mounted is suppressed, resulting in a more compact external shape and improved engine mountability.

In the above case, the auxiliary parts equipped with the driven pulley are 4.
Although the explanation has been given as one, the effects of the present invention can be obtained even if the number is increased or decreased.

[Brief explanation of drawings]

FIG. 1 is a front view of a ■-type engine as an embodiment of the present invention, FIG. 2 is a plan view of the same V-type engine, and FIG. 3 is a partial side view of the same ■-type engine. 1...Crankshaft, 2...Cylinder block, 3...V valley, 8...Belt opposing wall, 1
3...Water pump, 19...Power steering pump, 2
2... Alternator, 26... Cooler compressor, 14.20° 23, 27... Driven pulley, C... Timing belt transmission system, D, E...
・Belt transmission system.

Claims (1)

[Claims] A cylinder block that accommodates the two sets of cylinder rows in a V-type engine formed by connecting two sets of cylinder rows formed by arranging individual cylinders in series in a V-shape at a predetermined bank angle. A water pump and other auxiliary parts including a driven pulley are housed in the upper center V valley, and a timing belt transmission system connecting the water pump and the crankshaft, and the auxiliary parts and the crankshaft are housed. A V-type engine characterized in that a belt transmission system connecting the cylinder blocks is arranged in this order in parallel to the wall of the cylinder block facing the timing belt.