JPH04290639A - Balancer of v-type engine - Google Patents

Abstract

PURPOSE:To improve the vibration characteristic without increasing the dimension of an engine by arranging an imbalance part over the total length of an engine and arranging a balance shaft driven at the speed in two times of that of a crankshaft under the crankshaft on one side part of an engine on the side where the less number of auxiliaries are installed. CONSTITUTION:A balance shaft 41 whose length is nearly equal to a cylinder block 9 and slightly shorter than the total length of an engine is arranged in parallel to a crankshaft 31 on a right side cylinder block 5 side which is set under the crankshaft 31 and on the side where the less number of auxiliaries are installed. An oil pump 61 is arranged in an oil pan 10 on the right side cylinder block 5 side. When the crankshaft 31 turns, a balance shaft 41 operates as transmission means, and the oil pump 61 turns at the equal speed to the crankshaft 31. Since the balance shaft is arranged on the right side cylinder block 5 under the crankshaft, the vibration performance is improved.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides a cylinder block with V
The present invention relates to a balancer device for a V-type engine in which a cylinder head is fastened to each bank formed by branching into a mold, and particularly to a technique for installing a balancer device in a V-type engine having auxiliary equipment.

0002

[Prior Art] Conventionally, as an engine balancer device,
For example, there is one shown in FIG. 6 (see Japanese Patent Publication No. 60-4384, etc.). That is, in the figure, a small end 82 of a connecting rod 81 is connected to a piston 85 that slides inside a cylinder 84 of an in-line four-cylinder engine 83, and a large end 86 is connected to a crank pin 88 of a crankshaft 87. ing. The crank journal 89 of the crankshaft 87 is
It is supported by a bearing 90 formed in the engine 83. The first balance shaft 91 and the second balance shaft 92 have rotation centers that are substantially parallel to the axial direction of the crankshaft 87, and are arranged on opposite sides of each other in the cylinder axis direction, forming a pair. . Both balance shafts 91 and 92 rotate in opposite directions at twice the rotational speed of the crankshaft 87 via a chain, a chain sprocket, etc. (not shown). In this case, the first balance shaft 91 is rotated in the same direction as the crankshaft 87, and the second balance shaft 92 is rotated in the opposite direction.

According to this configuration, the balance shafts 91, 9
2 on both sides of the cylinder axis, it is possible to simultaneously reduce the vertical inertia force of the in-line four-cylinder engine 83. On the other hand, a V-type 6-cylinder engine has a pair of banks installed in a roughly V-shape from the front on the left and right sides of the crankcase that is fastened to the cylinder block, and a cylinder head is fastened to each bank, and each bank is provided with a valve mechanism. be.

[0004] In the V-type 6-cylinder engine, an unbalanced portion is provided over the entire length of the engine, and by providing one balance shaft that rotates at twice the speed of the crankshaft, the V-type 6-cylinder engine is improved. It is possible to reduce the generated load and the rolling moment associated with the moment arm. In addition, an engine is generally equipped with various auxiliary devices such as an oil pump and an alternator that are driven by the crankshaft.
Some oil pumps are driven by a sprocket fixed to the crankshaft via a drive chain, while others drive the inner gear of the oil pump directly by the crankshaft.

[0005]

[Problem to be solved by the invention] Here, the 90° V-shaped 6
In a cylinder engine, the angle between both banks is 90°.
Therefore, since the banks are relatively wide apart, it is possible to dispose one balance shaft between the banks as in US Pat. No. 2,838,957. but,
Movement in opposite directions occurs between the front and rear sides of the engine60
°In a V-type 6-cylinder engine, the unbalanced section can cancel out the movement by rotating a single balance shaft provided over the entire length of the engine at twice the speed of the crankshaft in the opposite direction, thereby generating power. Resonance of plants, etc.
Although it is known that the sound vibration of a vehicle can also be reduced, since the distance between the banks is narrow, it is impossible to arrange a balance shaft between the banks as in a 90° V-6 engine. Furthermore, in a V-type six-cylinder engine, there is a cylinder head connected to a bank above the engine, so various auxiliary machines such as an oil pump and an alternator are arranged below the engine.

[0006] Therefore, if a balance shaft with an unbalanced portion extending over the entire length of the engine is provided near the lower side of the engine, the balance shaft will be placed in the place where various auxiliary devices such as the oil pump and alternator were conventionally installed. As a result, the various auxiliary equipment will protrude to the sides of the engine, increasing the overall width of the engine, increasing the size of the engine, and potentially hindering the miniaturization of the engine room. It was difficult to install the balance shaft.

In view of the conventional situation, the present invention improves the mounting position and driving method of a V-type engine in which a cylinder head is fastened to each bank formed by branching a cylinder block into a V-shape. It is an object of the present invention to provide a balancer device to which a balance shaft can be attached, which can improve the vibration performance of an engine without increasing the size of the engine.

[0008]

[Means for Solving the Problems] Therefore, the present invention provides a V-type engine equipped with one balance shaft having an eccentric weight and disposed parallel to the crankshaft. A driven balance shaft is disposed on one side of the engine to which fewer auxiliary machines are attached and below the crankshaft, and an oil pump driven via the balance shaft is disposed on one side of the engine. The oil filter is disposed in the oil pan chamber below the balance shaft, and the oil filter is provided on one side of the oil pan.

[0009]

[Operation] According to this configuration, one balance shaft is disposed below the crankshaft and on the side of the engine where a smaller number of auxiliary machines are attached, so that the balance shaft can be used for various parts of the engine. It is possible to prevent overlapping with other auxiliary equipment. This makes it possible to position the center of gravity of the entire engine, including the auxiliary equipment, closer to the center of the engine and lower. Moreover, since the balance shaft can be prevented from overlapping with the auxiliary equipment, when the auxiliary equipment is attached to the engine, it is possible to bring the auxiliary equipment closer to the engine body, and an increase in the overall width can be prevented.

Furthermore, since the oil pump is disposed within the oil pan and driven by the rear end of the balance shaft, it is possible to dispose and drive the oil pump without increasing the overall length or width of the engine. Ta. Furthermore, since the balance shaft, oil pump, and oil filter are disposed on one side of the engine, the oil supply passage to the main gallery is also disposed on one side, thereby simplifying the lubrication path.

[0011]

[Embodiments] Examples of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 show a device 6 equipped with a balancer device according to the present invention.
This shows a V-type six-cylinder engine 1 with a 0° bank. That is, the V-type 6-cylinder engine 1 has first and second engine blocks 3 and 4, and each engine block 3 and 4 has a cylinder block 5 and 6 and a head gasket (not shown) on the upper surface thereof. Cylinder head 7 joined via
・It is more like 8.

An oil pan 10 is provided on the open lower surface of the integrated cylinder block 9 via a sealing material (not shown). A common crankshaft 31 driven by the engine is supported at the center of the lower surface of the integrated cylinder block 9, and valve mechanisms (not shown) are supported at the upper portions of the cylinder heads 7 and 8, respectively. Furthermore, an alternator 21 and an air conditioner compressor 22, which are auxiliary machines, are fastened to the side surfaces of the left cylinder blocks 6 and 9 by bolts or the like (not shown). Here, alternator 21
and a cylinder block 6 with an air conditioner compressor 22
The auxiliary machines 21 and 22 are arranged in a cylinder block 9 having a small engine width so that the amount of protrusion from the end 6a of the engine is minimized.
It is located near the bottom of the engine, on the side of the engine. In addition, the cylinder blocks 5 and 6 are provided with exhaust pipes (not shown), but in the V-type 6-cylinder engine 1, the left cylinder row is shifted toward the rear of the engine with respect to the right cylinder row. There is a so-called bank offset. Therefore, an exhaust pipe (not shown) passes through the rear side of the engine, and the alternator 21 and air conditioner compressor 22 are located on the front side of the engine because the length of each device is long. There is.

Further, a power steering oil pump 23 is fastened to the side surface of the right cylinder block 5, and the power steering oil pump 23 also has a minimum amount of protrusion from the end 5a of the cylinder block 5, as described above. So that...
It is disposed near the bottom of the engine, which is the side surface of the cylinder block 9, and similarly to the above, it is disposed on the front side of the engine through which the exhaust pipe does not pass.

Here, the crankshaft 31 is rotatably supported by a plurality of bearing caps 12 in the cylinder block 9, and a bearing beam 13 is fastened and connected to the lower surface of each of the bearing caps 12 by bolts 14. There is. A pulley 33 around which a V-belt 32 that drives the alternator 21 and the air conditioner compressor 22 is wound is fixed to the crankshaft 31 on the front side of the engine. A pulley 35 around which a V-belt 34 for driving the belt 23 is wound is fixed. A valve train sprocket 36 for driving a valve train (not shown) is fixed inside the pulley 35, and a sprocket 37 for driving a balance shaft 41, which will be described later, is adjacent to the valve train sprocket 36. is fixed. Further, the crankshaft 31 is connected to a flywheel 3 to which a transmission (not shown) is connected to the rear end of the engine.
It has 9.

Here, as a configuration according to the present invention, a balance shaft 41 whose length is slightly shorter than the overall length of the engine is arranged parallel to the crankshaft 31 on the right side of the cylinder block 5 below the crankshaft 31. has been done. here,
The balance shaft 41 is rotatably supported by three metal bearings 42, 43, and 44 at the lower part of the cylinder block 9, and an unbalanced portion is formed between each bearing 42, 43, and 44 to simultaneously reduce vertical inertia and rolling moment. 45 and 46 are provided. In addition, in the V-type 6-cylinder engine 1, unbalance occurs in opposite directions between the front side and the rear side of the engine, so the unbalanced portion 4
The effect will be greater if the lengths 5 and 46 are provided longer from the front side to the rear side of the engine. Further, a spur gear 47 is fixed to the end of the balance shaft 41 on the front side of the engine, and a sprocket 48 for driving an oil pump is fixed to the end on the rear side.

A relay shaft 51 is rotatably supported by a bearing 52 at the bottom of the cylinder block 9 adjacent to the balance shaft 41. A sprocket 53 having one-half the number of teeth of the sprocket 37 is fixed to the relay shaft 51 on the same plane as the sprocket 37 which rotates together with the crankshaft 31, and is further connected to the spur gear 47 of the balance shaft 41. A spur gear 54 having the same number of teeth as the spur gear with which it meshes is fixed.

Further, as a configuration according to the present invention, an oil pump 61 is disposed on the right side of the cylinder block 5 and in the oil pan 10 below the balance shaft 41. In the oil pump 61, an inner gear 63 is rotated by a sprocket 62 fixed to an input shaft, and the oil sucked from a strainer 64 is passed through an oil discharge passage 65 to an oil filter attached to the side surface of the right cylinder block 5. Oil is being sent to 66. In addition, in this example,
The sprocket 62 has twice the number of teeth as the sprocket 48. The oil from which dust and the like have been removed by the oil filter 66 is sent to the main gallery 68 through an oil supply passage 67.

When the crankshaft 31 rotates, the chain 38 connecting the sprocket 37 and the sprocket 53 causes the relay shaft 51 to rotate in the same direction at twice the speed of the crankshaft 31, and the spur gears 54 and 47 rotate. Due to the meshing, the balance shaft 41 is rotated at twice the speed of the crankshaft 31 in the opposite direction to the rotation direction of the crankshaft 31. Furthermore, the balance shaft 41 serves as a transmission means, and the sprocket 4
8 and the sprocket 62, the oil pump 61 rotates at one-half the speed of the balance shaft 41, that is, at the same speed as the crankshaft 31.

Next, the operation of this embodiment will be explained. Alternator 2 is installed on the side of left cylinder block 6 and 9.
1 and an air conditioner compressor 22, and a power steering oil pump 23 is connected to the side of the right cylinder block 5. However, the balance shaft 41 is attached to the right cylinder block 5 to which only the power steering oil pump 23 is attached. Furthermore, since it is disposed below the crankshaft 31, it is possible to position the center of gravity of the entire V-type six-cylinder engine 1 substantially below the center of the engine, improving vibration performance. Furthermore, by installing the balance shaft 41 on the right side of the engine 1 without overlapping with the power steering oil pump 23, and installing the alternator 21 and the air conditioner compressor 22 on the left side of the engine 1, the overall width of the V-type 6-cylinder engine 1 can be increased. Increase can be prevented.

Conventionally, the sprocket 37 for driving the balance shaft 41 is fixed at the position where the sprocket for driving the oil pump is installed, and the unbalanced portions 45 and 4 are fixed.
6, the oil pump 61 is disposed in the oil pan 10, and the oil pump 61 is connected to the rear end of the balance shaft 41 using the balance shaft 41 as a transmission means. Since the oil pump 61 is driven, there is no need to provide a sprocket on the crankshaft 31 to drive the oil pump 61, and there is no need to use a direct drive type oil pump.
It is now possible to set up 1. That is, it has become possible to arrange and drive the oil pump 61 without increasing the overall length of the V-type 6-cylinder engine 1.

Furthermore, since the balance shaft 41 is disposed on the right side of the cylinder block 5 below the crankshaft 31, it does not affect the arrangement of the power steering oil pump 23, and the V-type 6 It has become possible to arrange and drive the balance shaft 41 without increasing the overall width of the cylinder engine 1. Furthermore, in this embodiment, the oil pan 1
A suspension unit (not shown) is provided below the front side of the oil pan 10, and therefore the front side of the oil pan 10 is formed shallowly. Therefore, in the past, the oil pump was installed on the front side of the engine, which increased the overall width, but in this embodiment, the oil pump 61 is installed on the rear side of the engine in the oil pan 10 below the balance shaft 41. Since the oil pump 61 is disposed in the V-type six-cylinder engine 1, it is possible to dispose and drive the oil pump 61 without increasing the overall width of the V-type six-cylinder engine 1. Furthermore, if the suction section is disposed at a shallow position, there is a risk that air will be sucked into the pump. Therefore, there is no risk of sucking in air when drawing from the strainer 64.

Furthermore, since the oil pump 61 and oil filter 66 are disposed on the right side of the engine, the oil supply passage 67 to the main gallery 66 is also disposed on the right side, and the oil supply passage 67 to the bearings 42 to 44 of the balance shaft 41 is also disposed on the right side. The oil supply passage is also shortened, simplifying the lubrication route.

[0023]

As explained above, according to the configuration of the present invention, the unbalanced portion is provided over the entire length of the engine, and the number of unbalanced shafts driven at twice the speed of the crankshaft is reduced. Because it is located on one side of the engine where the auxiliary equipment is attached and below the crankshaft, it is possible to move the center of gravity of the entire V-type engine toward the center of the engine and toward the bottom, which improves vibration performance. Also, since the balance shaft is installed without overlapping the auxiliary equipment, it is possible to prevent the overall width of the engine from increasing.

[0024] Also, since the oil pump driven via the balance shaft is disposed on the one side and in the oil pan chamber below the balance shaft, and the oil filter is provided on the one side, It became possible to install and drive the balance shaft and oil pump without increasing the overall length and width of the V-type engine.

[Brief explanation of the drawing]

FIG. 1 is a partial side sectional view of a 60° bank V-type 6-cylinder engine showing an embodiment of the present invention.

[Fig. 2] A front view of the engine including the BB cross-sectional view and the C-C cross-sectional view in Fig. 1.

[Fig. 3] A plan view including the balance axis in the same embodiment as above.

[Figure 4]
Assembling view from inside the oil pan in the above example

[Figure 5] DD sectional view in Figure 1

[Fig. 6] Schematic diagram of a conventional engine balancer device

[Explanation of symbols]

1 V type 6 cylinder engine 5 Cylinder block 6 Cylinder block 9 Cylinder block 10 Oil pan 21 Alternator 22 Air conditioner compressor 23 Oil pump for power steering 31 Crankshaft 37 Sprocket 38 Chain 41 Balance axis 45 Unbalanced part 46 Unbalanced part 47 Spur gear 48 Sprocket 49 Chain 51 Relay axis 61 Oil pump 62 Sprocket 66 Oil filter

Claims (1)

[Claims] Claim 1: In a V-type engine equipped with one balance shaft having an eccentric weight and arranged parallel to the crankshaft, the balance shaft driven by the crankshaft at the front of the engine is connected to a smaller number of balance shafts. An oil pump driven via the balance shaft is installed on one side of the engine on which the auxiliary equipment is attached and below the crankshaft, and an oil pump driven through the balance shaft is installed in the oil pan chamber on the one side and below the balance shaft. 1. A balancer device for a V-type engine, characterized in that the balancer device is disposed in a V-type engine, and an oil filter is provided in the one side portion.