JPS6337465Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field This invention has an engine body whose cylinder axis is approximately horizontal or inclined, and blow-by gas in the crank chamber is transferred to the intake manifold through the PCV chamber. The present invention relates to the PCV chamber support device of a multi-cylinder internal combustion engine equipped with a so-called PCV device, which is configured to recirculate air to the PCV chamber.

(2) Prior Art Conventionally, horizontal or inclined internal combustion engines in which the cylinder axis is substantially horizontal or inclined are already well known (see Japanese Utility Model Publication No. 14023/1983).

Also, a so-called PCV system is already well known, in which blow-by gas generated in the engine crank chamber is sucked into an intake manifold and re-combusted. (Refer to the book "Automotive Exhaust Purification Device and its Maintenance" published by Sankaido) (3) Problems that the invention aims to solve By the way, in an internal combustion engine, the cylinder axis is approximately horizontal or inclined on the upper surface of the engine body, especially on the cylinder block. Recesses with a relatively wide area are formed between the cylinder and the crankcase, between each cylinder, etc., and water, oil, etc. remain there, causing corrosion on the top surface of the engine body, and also causing the appearance to deteriorate. There is also the problem that the appearance of the book is not good.

This invention was developed in view of the above circumstances, and uses the PCV chamber of the PCV device to return blow-by gas in the crank chamber to the intake manifold to prevent water, oil, etc. from accumulating in the recess on the top surface of the engine body. In addition, the crank chamber and
The communication structure with the PCV chamber has been simplified, and the blow-by gas in the crank chamber is always reliably extracted to the PCV chamber.
PCV in multi-cylinder internal combustion engine with new PCV device
The object is to provide a chamber support device.

B. Structure of the invention (1) Means for solving the problem According to the invention, in order to achieve the above-mentioned purpose, the engine body has an engine body whose cylinder axis is approximately horizontal or inclined, and the blow-by gas in the crank chamber is channeled through the PCV chamber. In a multi-cylinder internal combustion engine equipped with a PCV device that recirculates the air to the intake manifold,
A surrounding wall surrounding the outer periphery of a recess formed therein is integrally formed on the upper surface of the engine body, and the upper surface of the surrounding wall is further covered by the PCV chamber disposed on the upper surface of the engine body. The PCV chamber communicates with the crank chamber through first and second blowby gas intake ports opened therein, and the second blowby gas intake port is opened in the bottom wall of the PCV chamber and communicates with the crank chamber through first and second blowby gas intake ports opened therein. It communicates with the upper part of the crank chamber directly below.

(2) Effect According to the above configuration, water, oil, etc. falling onto the recess on the top surface of the cylinder block are blocked by the PCV chamber and guided to the outside, and water, oil, etc. are prevented from flowing into the recess. There is no need to worry about it building up. In addition, blow-by gas generated in the crank chamber of the engine body is reliably guided to the PCV chamber.

(3) Embodiment Hereinafter, an embodiment in which the present invention is applied to a four-cylinder internal combustion engine for a vehicle will be described with reference to the drawings.

A four-cylinder internal combustion engine having an engine body E in which the cylinder axis L ₁ -L ₁ is substantially horizontal or inclined is mounted horizontally in a vehicle (with the crankshaft 9 orthogonal to the longitudinal direction of the vehicle), and the head portion of the engine is backward with respect to the forward direction of the vehicle (direction of arrow A in the figure).

The engine body E includes a cylinder block 1 and a cylinder head 2 which is superposed and bonded to one end surface of the cylinder block 1. The cylinder block 1 has a cylinder 3 and a crankcase half 4. A crank case 6 is formed by integrally bonding a bearing cap 5 to the crank case 4.

As usual, a piston 7 is slidably fitted into the cylinder 3, and the piston 7 is interlocked with a crankshaft 9 rotatably supported by a crankcase 6 via a connecting rod 8. This crankshaft 9 has its crank pin ₉₁ aligned with the cylinder axis.
When moving below L ₁ −L ₁ , piston 7
The direction of rotation (direction of arrow R in the figure) is regulated so that it takes an upward stroke.

A combustion chamber 10 is formed in the cylinder head 2 facing the top surface of the piston 7, and an ignition plug 11 is provided therein. Also, in cylinder head 2,
A valve operating device 14 for operating the intake and exhaust valves 12 and 13 is provided, and this valve operating device 14 is provided in a valve operating cam chamber 15 on the cylinder head 2.

An oil pan 16 is connected to the lower part of the cylinder head 2 and the crankcase 6, and the engine body E
An oil reservoir 17 is formed in the lower part of the oil reservoir 17, and a predetermined amount of lubricating oil 18 is stored in this oil reservoir 17. ), each lubricated part of the engine body E is forcibly supplied with oil.

At the bottom of the engine body E, there is a buttful plate 19 integrated with the cylinder 3 and crankcase 6.
is formed, and this buff-full plate 19 partitions the crank chamber 22 and the oil reservoir 17. The buffle plate 19 is provided with a first oil return hole 20 biased toward the cylinder side and a second oil return hole 21 biased toward the bearing cap 5 side. cylinder 3
The lower part ₃₁ faces into the crankcase 6,
The lower portion 3 ₁ and the end wall 19 ₁ of the buff-full plate 19 form an oil receiving chamber 23 . This oil receiving chamber 23 is connected to the crankshaft 9
It is open to the crank chamber 22 so as to face the direction of rotation of the crankshaft 9 (direction of arrow R in the figure), so that oil dragged along the web portion ₉₂ by the rotation of the crankshaft 9 can be temporarily stored.

Another baffle plate 24 is vertically installed on the lower surface of the cylinder 3 toward the oil pan 16.

The cylinder axis is below the cylinder axis _L1 - _L1 and passes through the center O of the crankshaft 9.
On the side of the bearing cap 5 from the crankshaft center line L ₂ -L ₂ which is orthogonal to L ₁ -L ₁ , an enormous chamber 25 facing the oil reservoir 17 is formed by the wall of the crankcase 6 and the buffer plate 19. A first blow-by gas extraction port 26 is opened in the crankcase 6 wall that forms the upper wall of the enlarged chamber 25 . The lower end of the suction tube 27 is connected to the first blow-by gas extraction port 26,
The tube 27 extends upward along the crankcase 6, and its upper end is disposed on the engine body E.
It is connected to the first blow-by gas intake port 29 of the PCV chamber 28 . An outlet 30 is opened in the upper wall of the PCV chamber 28.
0 is connected to the intake manifold Mi of the engine body E via the conventionally known PCV valve 31 and tube 32.
will be communicated to. A plurality of baffle plates 33 are arranged in a staggered manner inside the PCV chamber 28.
The blow-by gas flowing into the chamber 28
The blow-by gas that flows through the engine and from which oil has been separated is drawn into the intake manifold Mi through the PCV valve 31 and the tube 32, and is re-burned. The PCV valve 31 has a conventionally known structure,
The opening degree is controlled so that when the engine rotates under high load, the opening degree increases, and when the engine rotates under low load, the opening degree decreases.

Cylinder 3 above the cylinder axis L ₁ -L ₁ and above the crankshaft center line L ₂ -L ₂
On the side, a second blow-by gas intake port 34 with an orifice 35 is opened in the bottom wall of the PCV chamber 28 on the boundary between the cylinder 3 and the crankcase 6 . This port 34 is
The lower part of the PCV chamber 28 and the upper part of the crank chamber 22 are communicated with each other.

Therefore, the engine body E whose cylinder axis L ₁ -L ₁ is substantially horizontal or inclined has a structure such that the upper surface thereof, especially the boundary between the cylinder 3 and the crankcase 6,
A recess 36 is formed between adjacent cylinders 3, and a closed surrounding wall 37 is integrally provided on the upper surface of the engine body E so as to surround the outer periphery of the recess 36. is higher than the top surface of the engine body E. Above the surrounding wall 37 is the PCV.
A chamber 28 is provided, and this PCV chamber 2
8 is supported on the engine body E via a stay 38. The projected plane area of the PCV chamber 28 is slightly larger than the projected plane area of the surrounding wall 37, and the upper part of the surrounding wall 37 is covered by the outer periphery of the bottom wall of the chamber 28. In addition, a skirt wall 3 is provided on the outer periphery of the bottom wall of the PCV chamber 28 toward the bottom.
A skirt wall 39 is integrally provided vertically, and this skirt wall 39 covers the outer periphery of the surrounding wall 37 with a gap left in between. PCV
The bottom wall of the chamber 28 faces into a recess 36 on the upper surface of the engine body E, and the recess 36 is used to
The volume of the PCV chamber 28 is secured.

Next, the operation of the embodiment of the present invention will be explained.

When the engine is now operated, the crankshaft 9 rotates downward along the bearing cap 5, that is, in the direction of arrow R in the figure.

When the vehicle is in normal running condition, the oil level in the oil reservoir 17 is at the first level, as shown by the solid line in the figure.
When the blow-by gas in the crank chamber 22 is below the blow-by gas extraction port 26, the blow-by gas in the crank chamber 22 is
into the PCV chamber 28 through the first blowby gas extraction port 26, the suction tube 27 and the first blowby gas intake port 29;
Here, the oil is separated and further the chamber 28
The blow-by gas in the engine passes through the PCV valve 31 and tube 32 to the engine's intake manifold.
It will be returned to Mi. At this time, the second blow-by intake port 34 functions as an oil return hole for returning the oil separated in the PCV chamber 28 to the crank chamber 22. In the above operation, there is a negative pressure near the second blowby gas intake port 34 in the crank chamber 22, but this negative pressure is much lower than the intake manifold negative pressure, so the blowby gas in the PCV chamber 28 is Crank chamber 22
There is almost no backflow inside.

Next, when the vehicle runs down a steep downhill slope, decelerates suddenly, or makes a sudden turn, and the oil is biased forward due to its inertia, the oil level in the oil reservoir 17 is inclined as shown by the dashed line in the figure to close the first blowby gas extraction port 26, but the second blowby gas intake port 34 allows the blowby gas in the crank chamber 22 to pass through the port 34. Tsute PCV chamber 28
It becomes possible to inhale.

Also, water, oil, etc. that are about to fall onto the recess 36 on the top surface of the engine body E are blocked by the PCV chamber 28 and surrounding wall 39, and are transmitted along the outer surface of the chamber 28 into the recess as shown by arrow a in FIG. It flows to the side of the recess 36, so there is no fear that the water, oil, etc. will accumulate in the recess 36.

C. Effects of the invention As is clear from the above embodiments, according to the invention, the cylinder axis has a substantially horizontal or inclined engine body, and the blow-by gas in the crank chamber is returned to the intake manifold through the PCV chamber. In the multi-cylinder internal combustion engine with a PCV device, the upper surface of the engine body is integrally formed with a surrounding wall that surrounds the outer periphery of a recess formed therein, and the upper surface of the surrounding wall is further formed with the upper surface of the engine main body. Since it was covered by the PCV chamber disposed on the upper surface, the PCV chamber and surrounding wall provided
To prevent water, oil, etc. from accumulating in the recess, to prevent discoloration and corrosion of the upper surface of the engine body due to water, oil, etc., and to improve the overall appearance of the engine body. I can do it.

The PCV chamber also has first and second blow-by gas intake ports 29 and 34 opened therein.
The second blow-by gas intake port is opened in the bottom wall of the PCV chamber and communicated with the upper part of the crank chamber directly below, so that the blow-by gas passage leading to the first blow-by gas intake port Even if the engine is blocked due to fluctuations in the oil level under the crank chamber, the second blow-by gas intake port allows the connection between the crank chamber and the PCV.
Since the blow-by gas in the crank chamber is communicated with the PCV chamber, the blow-by gas in the crank chamber can always be reliably released into the PCV chamber.Furthermore, since the crank chamber is located directly under the PCV chamber, the second blow-by gas intake port and the crank chamber are communicated with each other. The passage configuration can be simplified.

[Brief explanation of drawings]

The drawings show an embodiment of the device according to the present invention, and FIG. 1 is a longitudinal sectional side view of a main part of a four-cylinder internal combustion engine equipped with the device according to the present invention, and FIG. 2 is a sectional view taken along the line taken in FIG. 1. E...Internal combustion engine body, _L1 - _L1 ...Cylinder axis, Mi...Intake manifold, 22...Crank chamber, 28...PCV chamber, 37...Enclosing wall.

Claims (1)

[Scope of utility model claims] It has an engine body E whose cylinder axis L ₁ -L ₁ is approximately horizontal or inclined, and is equipped with a PCV device that allows blow-by gas in the crank chamber 22 to flow back to the intake manifold Mi via the PCV chamber 28. In a multi-cylinder internal combustion engine, a surrounding wall 37 surrounding the outer periphery of a recess 36 formed therein is integrally formed on the upper surface of the engine main body E, and the upper surface of the engine main body E The PCV chamber 28 communicates with the crank chamber 22 through first and second blow-by gas intake ports 29 and 34 opened therein, and the second blow-by gas The gas intake port 34 is connected to the PCV chamber 28.
The crank chamber 2 is opened in the bottom wall of the
2. A PCV chamber support device in a multi-cylinder internal combustion engine with a PCV device, characterized in that the device is communicated with the upper portion of the PCV chamber.