JPH048257Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a cooling system for a V-type engine that uses a coolant to cool a V-type engine that is configured with two cylinder rows arranged in a V-shape. Regarding equipment.

(Prior Art) As an engine type in which a plurality of cylinders can be arranged with a relatively short crankshaft, a so-called V-type engine is known, which has a cylinder block in which two rows of cylinders are arranged in a V-shape. The liquid cooling system for such a V-type engine has a water pump installed at one end of the cylinder block, and the position of the water pump is A coolant passage section is formed to connect each of the banks and the pair of banks formed including the respective cylinder rows, and the coolant is circulated by a water pump.

On the other hand, the camshafts arranged in each bank of a V-type engine are driven by the rotation of the crankshaft being transmitted via a chain or belt, etc. Therefore, for example, a crankshaft pulley is attached to each of the crankshaft and camshaft. and a camshaft pulley are attached, and a chain or belt is mounted between the crankshaft pulley and the camshaft pulley.
In such a case, the ratio of the diameters of the crankshaft pulley and the camshaft pulley is required to be 2:1, and therefore, for example, the diameter of the camshaft pulley can be set arbitrarily. It is not possible.

Therefore, when a V-type engine is of the so-called double overhead camshaft (DOHC) type in which two camshafts are arranged in each bank, two camshafts are arranged in each bank. The two camshaft pulleys attached to each of the two camshaft pulleys are placed next to each other and driven via a common chain or belt, so that the center of both of the two camshaft pulleys placed next to each other is The dimension in the direction connecting the banks, that is, the dimension in the direction perpendicular to the camshaft in each bank becomes relatively large, and as a result, the dimension in the direction perpendicular to the crankshaft of the entire V-type engine increases. For this reason, for example, in a V-type engine that uses the DOHC type, the power transmission mechanism between the crankshaft and the camshaft, which is located at one end of the cylinder block, is assumed to include a reduction gear. The rotation of the shaft is transmitted to the camshaft via a reduction gear, thereby reducing the diameter of the camshaft pulley attached to the camshaft, reducing the dimension of each bank in the direction perpendicular to the camshaft. It is known to do.

(Problem to be solved by the invention) However, in a V-type engine in which a reduction gear is interposed in the power transmission mechanism that transmits the rotation of the crankshaft to the camshaft, the above-mentioned A space for the water pump installed at one end of the cylinder block, a coolant passage connecting the water pump position and each bank, and a reduction gear in the power transmission mechanism that transmits the rotation of the crankshaft to the camshaft. As a result, the dimension in the direction along the crankshaft, that is, the overall length, is increased.Furthermore, the rotation of the crankshaft is transmitted to the camshaft. There is a disadvantage that interference with surrounding parts of the power transmission mechanism is likely to occur.

In view of this, the present invention includes a reduction gear device in a power transmission mechanism that transmits the rotation of a crankshaft to a camshaft in each of a pair of banks each including two rows of cylinders arranged in a V-shape. Even in a V-type engine in which a reduction gear is interposed, the dimensions in the direction along the crankshaft are not increased, and the power transmission mechanism in which a reduction gear is interposed is likely to interfere with the surrounding parts thereof. It is an object of the present invention to provide a cooling device for a V-type engine, which is equipped with a water pump installed at the end of a cylinder block and a coolant passage section for guiding coolant to each bank.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a cooling system for a V-type engine according to the present invention includes a cylinder block in which two rows of cylinders are arranged in a V-shape, and each cylinder A pair of banks including rows are formed at one end side of each of the pair of banks to direct the rotation of the crankshaft to the end of the camshaft in one of the pair of banks at the end of the cylinder block and to the end of the crankshaft at the end of the cylinder block. The bank is provided at a position between the end of the camshaft and the end of the crankshaft and closer to the crankshaft side, and at a position between the end of the camshaft and the end of the crankshaft of the other of the pair of banks and closer to the crankshaft side. In a V-type engine, a V-type engine is provided with first and second power transmission mechanisms that transmit power to camshafts in each of a pair of banks through each of a pair of reduction gears. A coolant passage section disposed between the first power transmitting mechanism and the second power transmitting mechanism and guiding the coolant to each bank, and a coolant passage section between the first power transmitting mechanism and the second power transmitting mechanism at the end of the cylinder block. and a water pump disposed at the position and connected to the coolant passage section.

(Function) In the cooling system for a V-type engine according to the present invention as described above, a pair of The position between the end of the camshaft and the end of the crankshaft in one of the banks and closer to the crankshaft, and the position between the end of the camshaft and the end of the crankshaft in the other of the pair of banks. The difference between the end of the cylinder block and the first
A coolant passage is disposed in the gap between the cylinder block and the second power transmission mechanism, and the first and second power sources are respectively disposed corresponding to each bank at the end of the cylinder block. A water pump is disposed in a space between the transmission mechanisms, and coolant from the water pump is supplied to each bank through the coolant passage between the end of the cylinder block and the first and second power transmission mechanisms. cooling in both banks.

In this way, the coolant passage and the water pump are respectively formed between the end of the cylinder block and the first and second power transmission mechanisms that are respectively disposed corresponding to each bank. Since the space is to be used effectively, the dimension of the engine in the direction along the crankshaft is not increased, and the first
Also, there is no risk that the second power transmission mechanism will be likely to interfere with its surrounding parts.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a front view schematically showing an example of a cooling system for a V-type engine according to the present invention together with a V-type engine to which it is applied, and FIG. 2 is a front view of a part of the example shown in FIG. FIG. 2 is a side view including a cross section. This example is applied to a DOHC type V-type engine in which two camshafts are disposed in each of a pair of banks each containing two rows of cylinders arranged in a well-known manner. It is considered to be a good thing.

In FIGS. 1 and 2, the V-type engine 11
has a cylinder block 16 in which a plurality of cylinders 10 are arranged in a V-shape, and the end of the crankshaft 12 disposed within the cylinder block 16 that projects outside from the cylinder block 16 has a
A plurality of crankshaft pulleys 14 are attached, and furthermore, between the cylinder block 16 on the crankshaft 12 and the crankshaft pulley 14,
Gear 18 is fixed.

Two camshafts 20 are disposed in the upper part of each of a pair of banks 21 that includes each row of cylinders 10 arranged in a V-shape. A camshaft pulley 22 is attached to the camshaft pulley 22 . The two camshaft pulleys 22 in each bank 21 are connected by a timing belt 24.
The camshaft pulley 22 is connected to a pulley 26 disposed near the crankshaft pulley 14.

The pulley 26 is fixed to one end of a rotating shaft 28, and a gear 30 that meshes with the gear 18 is fixed to the other end of the rotating shaft 28. These crankshafts 1
A pair of gears 30 and a pair of pulleys 26 are respectively fixed to a pair of rotating shafts 28 provided corresponding to the gear 18 fixed to the gear 18 and each bank 21, and reduce the rotation of the crankshaft 12. In order to transmit the signal to the two camshafts 20 in each bank 21 via the timing belt 24, the two camshafts 20 in each bank 21
A pair of reduction gears are arranged between the camshaft 20 and the crankshaft 12 and are arranged closer to the crankshaft 12 side, and in each of them, the ratio of the diameters of the gear 18 and the gear 30 is , and the ratio of the diameters of the pulley 26 and the camshaft pulley 22 is set such that the rotation ratio of the crankshaft 12 and the camshaft 20 is 2:1. As a result, compared to the case where the crankshaft pulley 14 and the camshaft pulley 22 are directly connected by the timing belt 24,
The diameter of the camshaft pulley 22 is made small.

In addition to the pair of reduction gears described above, the camshaft pulley 22 and the timing belt 24 are used to control the crankshaft 12 for each of the pair of banks 21.
First and second power transmission mechanisms are formed to transmit the rotation of the camshaft 20 to the camshaft 20.

In such a V-type engine 11, as shown in FIG. 2, a gear 18, a gear 30, and a pulley 26 forming a reduction gear are provided, so that the timing of forming the above-mentioned power transmission mechanism with the end of the cylinder block 16 is determined. A coolant passage section 32 is disposed at the end of the cylinder block 16 by utilizing the gap created between the cylinder block 16 and the belt 24. Further, the cylinder block 16 in which the coolant passage section 32 is disposed
The water pump 34 is located at an intermediate position between the pair of banks 21 at the end of the bank 21, that is, at a position sandwiched between the timing belts 24 forming each of the pair of power transmission mechanisms disposed corresponding to the pair of banks 21, respectively.
is located. The water pump 34 has a housing that projects outwardly from the end of the cylinder block 16 and is provided with a pulley 35, which is connected to the crankshaft pulley 1 attached to the crankshaft 12 by a belt 36.
It is connected to one of the 4.

Then, the water pump 34 and the coolant passage section 3
2 forms the main part of the cooling system in the V-type engine 11, and this cooling system is
By transmitting the rotation of the crankshaft 12 to the water pump 34 via the belt 36, the water pump 34 is rotationally driven and operated.

(Effect of the invention) As is clear from the above explanation, the V
The cooling system of the type engine is arranged in a V-shape.
The end of the camshaft in one of the banks and the crank are connected to first and second power transmission mechanisms that transmit the rotation of the crankshaft to the camshaft in each of a pair of banks each including a row of cylinders. A position between the end of the camshaft and the end of the crankshaft and a position closer to the crankshaft, and a position between the end of the camshaft and the end of the crankshaft of the other of the pair of banks and closer to the crankshaft. Even in a V-type engine in which a pair of reduction gears are provided, the space formed between the first and second power transmission mechanisms corresponding to the pair of banks, the cylinder block, and the first and second The aim was to make effective use of the gap formed between the V-type engine and the power transmission mechanism, without increasing the dimensions of the V-type engine in the direction along its crankshaft, and by interposing a reduction gear in each case. The water pump installed at the end of the cylinder block and the coolant passage section that guides the coolant to each bank can be installed without causing interference with the surrounding parts of the first and second power transmission mechanisms. Be prepared.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a cooling device for a V-type engine according to the present invention together with an engine to which it is applied, and FIG. 2 is a side view including a cross section showing a part of the example shown in FIG. In the figure, 12 is a crankshaft, 14 is a crankshaft pulley, 16 is a cylinder block, 18 and 30 are gears, 20 is a camshaft, 22 is a camshaft pulley, 24
26 is a timing belt, 26 is a pulley, 32 is a coolant passage, and 34 is a water pump.

Claims (1)

[Scope of utility model registration request] A cylinder block is provided in which two cylinder rows are arranged in a V-shape, and a pair of banks each including the two cylinder rows is formed, and a crankshaft is attached to one end side of each of the pair of banks. The rotation is performed between the end of the camshaft in one of the pair of banks at the end of the cylinder block and the end of the crankshaft, closer to the crankshaft side, and the other of the pair of banks. The cam in each of the pair of banks is transmitted through a pair of reduction gears, each of which is provided between the end of the camshaft and the end of the crankshaft and closer to the crankshaft. In a V-type engine equipped with first and second power transmission mechanisms that transmit power to a shaft,
the ends of the cylinder block and the first and second cylinder blocks;
a cooling fluid passage portion disposed between the cylinder block and the power transmission mechanism to guide the cooling fluid to the pair of banks; and the first power transmission mechanism and the second power transmission mechanism at the ends of the cylinder block. A cooling device for a V-type engine, comprising: a water pump disposed between and connected to the coolant passage section.