JPH04209927A - Accessory part driving gear for internal combustion engine - Google Patents

Abstract

PURPOSE:To operate partly a cylinder at the time of cutting off a timing belt by individually providing the timing belt, which drives a cam shaft provided in each bank, and independently driving the cam shaft in each bank. CONSTITUTION:An internal combustion engine 1 is constituted, for instance, into a 6-cylinder V-engine to set an angle between banks 1a, 1b, for instance, to 90 deg.. Here, a timing belt 32 for driving cam shaft pulleys 21, 22 of the one bank 1a is driven by a balancer shaft driving pulley 27 provided in a side of the bank 1a. On the other hand, a timing belt 33 for driving cam shaft pulleys 23, 24 of the other bank 1b is driven by a balancer shaft driving pulley 28 provided in a side of the bank 1b. That is, a timing belt for driving each cam shaft 9 to 12 is divided into the two timing belts 32, 33 provided independently drivably corresponding to each bank 1a, 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an auxiliary component drive device for an internal combustion engine.

(Prior art and problems to be solved by the invention) Generally, an automobile engine has a timing belt for driving a camshaft, a supercharger, and an alternator.
Auxiliary drive belts are attached to drive various auxiliary parts such as
(see publication).

By the way, in conventional examples including the above-mentioned known example, the timing belt is usually constructed from one belt member.

On the other hand, there has been an increasing demand for compact engine units including auxiliary parts in recent years, and V-type engines are being developed to meet this demand.

In an engine with such a structure, the camshafts are installed in correspondence with each bank of the engine, so if you try to drive all the camshafts with one timing belt as in the conventional example, The timing belt has to be extremely long, and in order to maintain its tension, it is necessary to take special measures to wrap the timing belt, and there are also problems with durability. In addition, if all camshafts are driven by a single timing belt, if the timing belt breaks, all cylinders of the engine will stop, causing the problem that the engine will immediately become inoperable. It will be forced.

The present invention has been made in view of the above points, and an object of the present invention is to enable operation of some cylinders of the V-type engine even when the timing belt is cut.

(Means for Solving the Problem) In the invention of claim 1, as a means for solving the above problem, in a V-type engine provided with two banks facing each other at a predetermined angle, each bank is provided with a Timing belts for driving the camshafts, each of which is offset by 1, are provided separately so that they can be driven independently.

In the invention of claim 2, as a means for solving the above problem, in the auxiliary parts drive device for an internal combustion engine according to claim 1, the crankshaft and the gear are provided in an upper part of the crankshaft in the type II engine. A balancer shaft driven by the connection is provided and in each bank,
A balancer shaft driving pulley is provided which is driven by a gear connection with the balancer shaft, each of the timing belts is driven by each of the balancer shaft driving pulleys, and a water pump is installed behind each of the balancer shaft driving pulleys. are doing.

According to a third aspect of the invention, in the auxiliary component drive device for an internal combustion engine according to the first aspect, each bank is provided with a crankshaft drive driven by a crankshaft and a gear connection. In addition to providing respective pulleys, each of the timing belts is driven by each of the crankshaft drive pulleys, and an oil pump is installed behind each of the crankshaft drive pulleys.

In the invention of claim 4, as a means for solving the above problem, in the auxiliary parts drive device for an internal combustion engine according to claim 1, a crankshaft and a gear are provided in an upper part of the crankshaft in the V-type engine. A balancer shaft driven by connection is provided, and one of the timing belts is driven by a crankshaft, and the other is driven by a balancer shaft.

(Function) In the invention of claim 1, the following effects can be obtained by the above means.

That is, since the timing belts corresponding to each bank are driven independently, even if one timing belt breaks, the camshaft can continue to be driven by the other timing belt.

In the invention of claim 2, the following effects can be obtained by the above means.

That is, since the timing belt corresponding to each bank is driven independently by the balance shaft drive pulley provided in each bank,
Even if one timing belt breaks, the camshaft can continue to be driven by the other timing belt. In addition, by installing a water pump behind each balancer shaft drive pulley, the water pump is driven by the same drive source as the timing belt, and if one of the timing belts breaks, However, by continuing to drive the other timing belt, the water pump can continue to operate.

In the invention of claim 3, the following effects can be obtained by the above means.

That is, since the timing belt corresponding to each bank is driven independently by the crankshaft drive pulley provided in each bank,
Even if one timing belt breaks, the camshaft can continue to be driven by the other timing belt. (f2) By installing the oil pump behind the crankshaft drive pulley, the oil pump is driven by the same drive source as the timing belt.

In the invention of claim 4, the following effects can be obtained by the above means.

In other words, one side of the timing belt corresponding to each bank is
Since the camshaft is driven by the crankshaft and the other by the balancer shaft, even if one timing belt breaks, the other timing belt can continue to drive the camshaft.

(Effects of the Invention) According to the invention of claim 1, in a 1V type engine equipped with two banks facing each other at a predetermined angle, each bank has:
The timing belts for driving the camshafts installed in each bank are provided separately so that they can be driven independently, so even if one timing belt breaks, the camshafts cannot be driven by the other timing belt. This means that the drive can continue, and even in the event of an accident while the car is running, it has the excellent effect of being able to drive itself to the repair shop.

According to the invention of claim 2, in the auxiliary parts drive device for an internal combustion engine according to claim 1, a balancer shaft driven by a gear connection with the crankshaft is provided above the crankshaft of the V-type engine. In addition, each bank of the V-type engine is provided with a balancer shaft drive pulley driven by the balancer shaft and the gear connection, and each timing belt is driven by each balancer shaft drive pulley, so that one timing belt is driven by the balancer shaft drive pulley. Even if the belt breaks,
This allows the camshaft to continue to be driven by the other timing belt, which has the excellent effect that even if an accident occurs while the vehicle is in motion, the vehicle can be driven to the repair shop on its own.

In addition, since the water pumps are installed behind each balancer shaft drive pulley, the water pumps are driven by the same drive source as the timing belt, and even if one of the timing belts breaks, By continuing to drive the other timing belt, the water pump can also continue to operate, which not only simplifies the structure, but also allows one bank of the engine to continue operating smoothly. Furthermore, since it is possible to position both timing belts on the same plane, there is an advantage that the amount of protrusion of the timing belt from the engine can be made the same as when one timing belt is used.

According to the invention of claim 3, in the auxiliary parts drive device for an internal combustion engine according to claim 1, each bank of the V-type engine has:
In addition to providing crankshaft drive pulleys that are driven by the crankshaft and gear connection, each timing belt is driven by each of the crankshaft drive pulleys, so even if one timing belt breaks, the other This allows the camshaft to continue to be driven by the timing belt, which has the excellent effect of allowing the vehicle to drive itself to the repair shop even in the event of an accident while the vehicle is in motion. Furthermore, since the oil pump is installed behind the crankshaft drive pulley, the oil pump is driven by the same drive source as the timing belt, which has the effect of simplifying the structure. Furthermore, since it is possible to position both timing belts on the same plane,
There is also the advantage that the amount of protrusion of the timing belt from the engine can be made similar to when one timing belt is used.

According to the invention of claim 4, in the auxiliary parts drive device for an internal combustion engine according to claim 1, a balancer shaft driven by a gear connection with the crankshaft is provided in an upper part of the crankshaft in the type II engine. In addition, one of the timing belts is driven by the crankshaft and the other is driven by the balancer shaft, so even if one timing belt breaks, the camshaft can still be driven by the other timing belt. This means that even if an accident occurs while the car is in motion, it has the excellent effect of being able to drive itself to the repair shop. Also, since it is possible to position both timing healds on the same plane, the amount of protrusion of the timing belt from the engine can be reduced by 1.
Another advantage is that it can be done in the same way as when a real timing belt is used.

(Embodiments) Hereinafter, some preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Embodiment 1 FIGS. 1 and 2 show an auxiliary component drive device for an internal combustion engine according to Embodiment 1 of the present invention. This embodiment corresponds to the first and second aspects of the invention.

The engine 1 of the internal combustion engine of this embodiment is a V-type six-cylinder engine, and the angle between each bank ta and lb is 9.
It is assumed to be 0°. In addition, the banks 1a and 1b
One of the holes (in the case of the present embodiment) is recessed deeper than the other hole lb due to bore offset.

The engine 1 includes a supercharger 2 and a water pump 3.3 driven by the driving force of the engine 1.
, an oil pump 4, an air conditioner compressor 5, an alternator 6, and a power steering unit 7. Code 8 is water-cooled intercooler, 9-12
is the camshaft.

The engine 1 is provided with a balancer shaft 14 located above the crankshaft 13 and rotating synchronously with the crankshaft 13, and both are connected via counter gears 15 and 16.

In the case of this embodiment, the supercharger 2 is disposed in a space formed between banks 1a and lb in engine 1. With this configuration, while attempting to effectively utilize the space between banks 1a and 1b,
We are trying to make Supercharger 2 larger.

The air conditioner compressor 5, alternator 6, and power steering unit 7 are collectively arranged below the engine 1.

Pulleys 17 to 24 for power transmission are attached to the supercharger 2, air conditioner compressor 5, alternator 6, power steering unit 7, and camshafts 9 to 12, respectively. Furthermore, pulleys 25 and 26 for power transmission are attached to the crankshaft 13 and balancer shaft 14, respectively.

On the left and right sides of the balancer shaft 14, there are balancer shafts that are driven by driven gears 30 and 31 that are respectively reduced in speed to 1/2 and meshed with a drive gear 29 that is coaxially supported with the counter gear 16 of the balancer shaft 14. Driving pulleys 27, 28 are provided, and the water pump 3.degree. 3 is provided behind each of the balancer shaft driving pulleys 27, 2B. In other words, in the case of this embodiment, cooling water is supplied to banks 1a and 1b by the corresponding water pumps 3.3, and thereby cooling water is supplied to banks 1a and 1b. This makes it possible to equalize the amount of water circulated.

Then, the camshaft pulley 21 of one bank Ia
, 22 is provided on the bank la side and driven by the single balancer shaft drive pulley 27, while the timing belt 32 is used to drive the camshaft pulleys 23 and 24 of the other bank 1b. 33 is to be driven by a balance shaft drive pulley 28 provided on the bank lb side.

In other words, in the case of this embodiment, the timing belts for driving the camshafts 9 to 12 are for each bank 1a,
The timing belts 32 and 33 are divided into two timing belts 32 and 33 which are provided so as to be able to be driven independently corresponding to the timing belts 1b and 1b. As a result, even if one timing belt 32 (or 33) breaks, the camshaft 11.
2 (or 9°10) and the water pump 3 can be driven. Therefore, even if an accident occurs while the vehicle is running, it is possible to drive the vehicle to a repair shop. Second, as in the non-embodiment O, hack the two timing belts 32 and 33 each.

If the timing belts 32 and 33 are provided in correspondence with Ib and configured to be driven by balance shaft drive pulleys 27 and 28, the timing belts 32 and 33 can be arranged on the same plane (see Fig. 2), and the timing belts 32 and 33 can be arranged on the same plane. The amount of protrusion of the belts 32 and 33 from the engine 1 can be made the same as when one timing belt is used. Furthermore, by configuring the timing belts 32 and 33 to be driven by the balancer shaft drive pulleys 27 and 28, which are reduced in speed to 1/2 relative to the balancer shaft 14, the diameters of the camshaft pulleys 21 to 24 can be reduced. Therefore, it is also possible to keep the width dimension occupied by the timing belts 32 and 33 small.

The balancer shaft pulley 26 is connected to the supercharger pulley 17 and the supercharger drive belt 3.
4 so that power can be transmitted. Further, the crankshaft pulley 25 is connected to the compressor pulley 18, the alternator pulley 19, and the power steering pulley 20 via an auxiliary drive belt 35 so that power can be transmitted. With this configuration, the drive system for driving the supercharger 2 (i.e., the supercharger drive belt 34) can be disposed between the two banks 1a, lb, and the supercharger drive belt 34 and It is also possible to arrange the auxiliary drive belt 35 and the timing belts 32 and 33 on the same plane, and the amount of protrusion from the engine 1 (i.e., overhang) can be kept as small as possible. (See Figure 2).

In the case of this embodiment, the oil pump 4 is installed in the oil pan section of the engine l, and is driven by a gear 36 that meshes with a driven gear 31 of the balancer shaft drive pulley 28. .

In the drawing, numeral 37 is a fixed idler on which the supercharger drive belt 34 is hooked, 38° and 39 are auto tension idlers on which the timing belts 32 and 33 are hooked, respectively, and 40 is a fixed idler on which the auxiliary drive belt 35 is hooked. The fixed idler 41 is an auto-tension idler on which the accessory drive belt 35 is hooked. In addition,
In the case of this embodiment, the fixed idler 37 is
It is arranged between banks 1a and 1b.

Embodiment 2 FIGS. 3 and 4 show an auxiliary component drive device for an internal combustion engine according to Embodiment 2 of the present invention. This embodiment corresponds to the first and second aspects of the invention.

In the case of this embodiment, in place of the balancer shaft drive pulleys 27 and 28 in Embodiment 1, driven gears 45 mesh with drive gears 42 located on the left and right sides of the crankshaft 13 and coaxially supported with the crankshaft 13. Crankshaft drive pulleys 43 and 44 are provided, each of which is reduced in speed by 1/2 and driven by .46. An oil pump 4 is provided at the rear of the side).

Then, the camshaft pulley 21 of one bank Ia
, 22 is connected to a crankshaft drive pulley 4 provided on the bank la side.
The timing belt 33 for driving the camshaft pulleys 23 and 24 of the other bank Ib is driven by a crankshaft drive pulley 44 provided on the bank Ib side. .

In other words, in the case of this embodiment, the timing belts for driving the camshafts 9 to 12 are for each bank Ia,
The timing belt 32 and 33 are divided into two timing belts 32 and 33, which are provided so as to be able to be driven independently corresponding to the timing belts 1b and 1b.

In addition, in the case of this embodiment, the water pump 3.3 includes:
Pulleys 47 and 4B for power transmission are respectively attached, and each of the water pump pulleys 47 and 48 is driven by the timing belt 32 and 33, respectively. In the case of this embodiment as well, it is possible to dispose the super thousand drive belt 34, the auxiliary drive belt 35, and the timing belts 32 and 33 on the same plane, and the amount of protrusion from the engine l ( In other words, the overhang can be kept as small as possible (see FIG. 4). The other configurations and effects are the same as those of the first embodiment, so their explanations will be omitted.

Embodiment 3 FIGS. 5 and 6 show an auxiliary component drive device for an internal combustion engine according to Embodiment 3 of the present invention. This embodiment corresponds to the inventions of claims 1 and 4.

In the case of this embodiment, two large and small pulleys 25a, 25b and 26a, 26b are pivotally supported on the crankshaft 13 and balancer shaft 14, respectively.

The small diameter pulley 26b of the balancer shaft 14 drives the timing belt 32 on one bank la side, and the small diameter pulley 25b of the crankshaft 13 drives the timing belt 33 on the other bank Ib side. Further, the auxiliary drive belt 35 is driven by the large diameter pulley 25a of the crankshaft 13,
A supercharger driving belt 34 is driven by the large diameter pulley 26a of the balancer shaft 14. In the case of this embodiment, the fixed idler 37, which is passed around the supercharger drive belt 34, is located below the bank la. In addition, in the case of this embodiment, the water pump pulleys 47 and 48 are
They are each driven by timing belts 32 and 33. Furthermore, in the case of this embodiment, the oil pump 4 is also provided with a pulley 49 for power transmission, and the oil pump pulley 49 is driven by the accessory drive belt 35.

In the case of this embodiment configured as described above, the timing belts 32 and 33 can be arranged on the same plane, but the auxiliary drive belt 35 can be arranged on the same plane as the timing belts 32 and 33. In addition, since the supercharger drive belt 34 and the fixed idler 40 are in a positional relationship that interferes with each other, it is necessary to dispose the supercharger drive belt 34 and the auxiliary drive heald 35 on the same plane. (See Figure 6). In addition,
When the position of the fixed idler 37 is shifted upward to avoid interference between the supercharger drive belt 34 and the fixed idler 40, the supercharger drive belt 35 and the auxiliary drive belt 35 are placed on the same plane. It is also possible to arrange it in The other configurations and effects are the same as those of the first embodiment, so their explanations will be omitted.

It goes without saying that the present invention is not limited to the configurations of the embodiments described above, and that the design can be modified as appropriate without departing from the gist of the invention.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an auxiliary component drive device for an internal combustion engine according to Embodiment 1 of the present invention, and FIG. 2 is Embodiment 1 of the present invention.
FIG.
A two-part fair view, FIG. 3 is a front view showing an auxiliary parts drive device for an internal combustion engine according to a second embodiment of the present invention, and FIG. 4 is a front view showing an auxiliary parts drive for an internal combustion engine according to a second embodiment of the present invention. FIG. 5 is a partial plan view schematically showing the device; FIG. 5 is a front view showing an auxiliary component drive device for an internal combustion engine according to a third embodiment of the present invention;
FIG. 6 is a partial plan view schematically showing an auxiliary component drive device for an internal combustion engine according to a third embodiment of the present invention. 1...Engine 1 a, 1 b...Bank 3...Water pump 4...Oil pump 9 to I2...Kamno Yaft 13...Crankshaft 14... - Balancer shaft 27.28 - Balancer shaft drive pulley 32.
33...Timing belt 43.44...Crank/YAFT drive pulley Applicant Mazda Corporation

Claims (1)

[Claims] 1. In a V-type engine equipped with two banks facing each other at a predetermined angle, each bank has an independent timing belt for driving a camshaft provided in each bank. A drive device for auxiliary parts of an internal combustion engine, characterized in that each part is separately provided so as to be driven. 2. A balancer shaft driven by a gear connection with the crankshaft is provided above the crankshaft in the V-type engine, and a balancer shaft drive is provided in each bank, which is driven by a gear connection with the balancer shaft. Each pulley is provided,
2. The internal combustion engine according to claim 1, wherein each of the timing belts is driven by each of the balancer shaft drive pulleys, and a water pump is installed behind each of the balancer shaft drive pulleys. Auxiliary parts drive device. 3. Each bank is provided with a crankshaft drive pulley driven by a crankshaft and a gear connection, and each timing belt is driven by each crankshaft drive pulley, and the crankshaft drive pulley is driven by the crankshaft drive pulley. 2. The auxiliary component drive device for an internal combustion engine according to claim 1, wherein an oil pump is installed behind the internal combustion engine. 4. A balancer shaft driven by a gear connection with the crankshaft is provided above the crankshaft in the V-type engine, one of the timing belts is driven by the crankshaft, and the other is driven by the balancer shaft. 2. The auxiliary component drive device for an internal combustion engine according to claim 1, wherein the auxiliary component drive device for an internal combustion engine is driven by.