JP2709396B2 - Heating device for engine auxiliary intake throttle valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heating device for preventing a sub intake throttle valve of an engine from freezing.

2. Description of the Related Art Conventionally, an intake system of an engine is disclosed in Japanese Patent Application Laid-Open No. 60-81458.

According to this, a pair of surge tanks are arranged side by side in the horizontal direction, one end is connected to a throttle body having a main intake throttle valve, and the other end is extended so as to have a pair of branch pipes, and each extension end is extended. Is provided with a connection pipe connected to the surge tank.

When the engine is driven, external air
The fuel is drawn into the cylinder of the engine through the throttle body, the connection pipe, and the surge tanks, and is used for combustion of fuel in the cylinder. Then, power is output by the combustion heat of the combustion.

In the above case, by opening and closing the main intake throttle valve, the intake amount of air and the supply amount of fuel into the cylinder can be adjusted, whereby a desired output can be obtained.

In the above configuration, when the engine is in an idle state, its rotational speed may easily fluctuate under the influence of various disturbances such as load fluctuation.

Therefore, conventionally, a sub intake throttle valve (so-called ISC valve) that has a passage that bypasses the main intake throttle valve and controls the intake amount of air is provided separately from the main intake throttle valve. In some cases, the idle speed is maintained at a predetermined speed.

By the way, especially in a cold region, there is a possibility that the operation of the auxiliary intake throttle valve may be hindered due to freezing, and therefore, a hot water passage is incorporated in the auxiliary intake throttle valve, and the engine cooling is performed in the hot water passage. There is a type in which the sub-intake throttle valve is heated by passing hot water later to prevent the icing, and the idle speed is more reliably maintained at a predetermined speed.

(Problems to be Solved by the Invention) However, the above conventional configuration has the following disadvantages.

That is, when the auxiliary intake throttle valve fails and is replaced with a new one, it is necessary to replace the normal portion forming the hot water passage with a new one. Will occur.

Also, suppose that water leaks from the hot water passage, since this hot water passage is incorporated in the auxiliary intake throttle valve, this water infiltrates the center of the valve of the auxiliary intake throttle valve, and freezes here. There is a possibility that the operation is hindered.

Further, hot water hoses are connected to the inlet and the outlet of the hot water passage, respectively. In this case, if each of the hot water hoses is easily visible in appearance, this may cause a deterioration in the appearance of the engine. Not preferred.

(Object of the Invention) The present invention has been made in view of the above circumstances, and when replacing the auxiliary intake throttle valve with a new one, it is necessary to prevent the replacement from being wasteful. Even if water leaks from the hot water passage, an object of the present invention is to prevent the adverse effect on the auxiliary intake throttle valve and further improve the appearance of the engine.

(Structure of the Invention) A feature of the present invention for achieving the above object is that a pair of surge tanks 9 and 10 are arranged in a horizontal direction, and one end is provided on a throttle body 5a having a main intake throttle valve 5 therein. In the intake system of an engine having a connection pipe 7 connected to the other end and having a pair of branch pipes 7a, 7a, and each of the extending ends connected to the surge tank 9, 10, Connection pipe 7 between bases of pipes 7a, 7a
A heater 19 having a hot water passage 28 is detachably mounted on the outer surface of the auxiliary intake throttle valve 18, and a sub-intake throttle valve 18 is provided on the side opposite to the connection pipe 7 with respect to the heater 19. Is attached to the heater 19 in a detachable manner, and the inlet 30 and outlet 31 of the hot water in the hot water passage 28 extend downward from the heater 19.

(Operation) The operation of the above configuration is as follows.

Since the heater 19 is attached to the outer surface of the connection pipe 7,
When the engine 1 is driven, the air flowing into the surge tanks 9 and 10 through the connection pipe 7 is heated by the heater 19. This is useful for driving the engine 1 in a cold region, for example, to ensure reliable combustion and stabilize the idle state.

Moreover, since the heater 19 is mounted on the outer surface of the connecting pipe 7 between the bases of the two branch pipes 7a, 7a, the air diverting the respective branch pipes 7a of the connecting pipe 7 is heated by the heating. The heating is almost uniformly performed by the vessel 19, and thus the idle state is more stable.

Further, a sub intake throttle valve 18 is attached to the heater 19 on the opposite side to the connection pipe 7, so that the heater 19
In addition to heating the air passing through the connection pipe 7 as described above, the air passing through the auxiliary intake throttle valve 18 is also heated more directly, and the idle state is more stabilized. is there.

In the above case, since the connecting pipe 7, the heater 19, and the auxiliary intake throttle valve 18 are detachably attached to each other, if the auxiliary intake throttle valve 18 fails, the auxiliary intake throttle valve 18 Can be removed and replaced with a new auxiliary intake throttle valve.

Further, even if water leaks from the hot water passage 28 of the heater 19, since the heater 19 is provided separately from the auxiliary intake throttle valve 18, the water permeates the auxiliary intake throttle valve 18. That is suppressed.

Further, an inlet 30 and an outlet of the warm water in the heater 19 are described.
Since the hot water hose 32 connected to the inlet portion 30 and the outlet portion 31 is easily seen from above since the lower portion 31 extends downward, the connection pipe 7 and the heater 19 prevent the hot water hose 32 from being easily seen from above. You.

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

In FIG. 2, reference numeral 1 denotes an automobile engine. The engine 1 is provided with an engine room at a front portion of a vehicle body so that a crankshaft (not shown) extends in a vehicle width direction, and sandwiches the crankshaft. The engine is a V-type six-cylinder engine having a front cylinder row 2 and a rear cylinder row 3. In the drawing, the arrow Fr indicates the front of the vehicle, and 4 indicates the right inner surface of the engine room.

The intake system of the engine 1 has a throttle body 5a disposed above and to the left of the engine 1 (referred to as the direction in which the vehicle travels; hereinafter the same). A main intake throttle valve 5 is provided in the passage, and the opening degree of the intake passage in the throttle body 5a is adjusted by opening and closing the main intake throttle valve 5.

The intake system of the engine 1 has an intake pipe 6 connected to the throttle body 5a. The intake pipe 6 includes a pair of front and rear surge tanks 9, 10 extending in the vehicle width direction, the throttle body 5a and the surge tank.
And a connection pipe 7 for connecting the surge tanks 9 and 10 with each other. The surge tanks 9 and 10 are arranged side by side in the horizontal direction (front-rear direction). It extends along the hindquarters.

The connection pipe 7 has a Y-shape. One end of the connection pipe 7 is connected to the throttle body 5a, and the other end is extended to have a pair of branch pipes 7a, 7a. The surge tanks 9 and 10 are connected to the left ends. The right ends of the surge tanks 9 and 10 are connected to each other by a surge tank connector 11, and the insides thereof are communicated with each other.

The intake pipe 6 and the intake ports of each cylinder of the engine 1 are connected by another intake pipe 13. Other intake pipe 13 above
Has a short tube 13a extending from one of the surge tanks 9 and 10, and a long tube 13b extending from the other, and the extending ends of both tubes 13a and 13b are connected to each other, and this connection The unit 13c is connected to the intake port. Further, another intake throttle valve 15 is provided in each of the short pipes 13a, and further, a sheet metal is connected from the connecting portion of the short pipe 13a to each of the surge tanks 9, 10 toward the inside of each of the surge tanks 9, 10. An air horn 16 is protruded.

The other intake throttle valve 15 opens and closes in conjunction with the rotation speed or output of the engine 1, that is, closes when the engine 1 is at a low speed and opens when the engine 1 is at a high speed. For this reason, at low speed, the intake air is supplied from the main intake throttle valve 5 →
It is sucked into each intake port through the intake pipe 6 and the long pipe 13b sequentially. In addition, at the time of high speed, in addition to the above-mentioned flow, the intake air is sucked into each intake port through the main intake throttle valve 5 → the intake pipe 6 → the air horn 16 → the other intake throttle valve 15 → the short pipe 13a in order.

1 to 3, a heater 19 is detachably mounted on a mounting seat 20 integrally formed on an outer surface of the connection pipe 7 between bases of the two branch pipes 7a, 7a by a stud bolt 21 and a nut 22. Attached to. In addition, the heater 19
On the side opposite to the connection pipe 7 with respect to
The sub intake throttle valve 18 is detachably attached to the heater 19 by the stud bolt 21 and the nut 22. More specifically, the heater 19 and the auxiliary intake throttle valve 18 are connected to a mounting seat formed integrally with the connection pipe 7.
20, a stud bolt 21 and a nut 21 are jointly detachably fastened to each other. Further, the auxiliary intake throttle valve 1
8, gasket 23 between heater 19 and mounting seat 20
Are interposed, and the seal between them is ensured.

The auxiliary intake throttle valve 18 is a known one, and the valve body of the auxiliary intake throttle valve 18 is made of aluminum die-cast. The intake passage in the sub intake throttle valve 18 is provided with the throttle body 5a so as to bypass the main intake throttle valve 5.
The area of the intake passage is expanded and contracted based on the exhaust gas condition, the water temperature, and the accelerator angle, so that the idling speed is kept constant. In addition, reference numeral 24 denotes a hood, which covers an upper opening of the engine room so as to be freely opened and closed.

In the above configuration, if the nut 22 is loosened, as shown by the phantom line in FIG.
The heater 18, the heater 19, and the gasket 23 can be individually attached and detached.

The heater 19 has a heater body 25 made of aluminum gravity casting. Inside the heater body 25, a bent hole 26 is formed. An aluminum hot water pipe 27 is fitted into the hole 26, and the inner hole of the hot water pipe 27 forms a hot water passage 28.

Each end of the hot water pipe 27 protrudes downward from the heater main body 25, and one end of the protruding hot water pipe 27 is connected to the hot water inlet portion 30,
The other end is an outlet 31. These inlet 30 and outlet
Numerals 31 extend downward, and a hot water hose 32 is connected to each of them. In addition, the hot water after cooling the engine 1 is used.

In the above case, the inlet 30 and the outlet 31 are located in the middle of the connecting pipe 7 in the vertical direction.
The connection pipe 7 prevents the connection between the outlet 30 and the hot water hose 32 from being easily seen from the outside.

In FIG. 2 and FIGS. 4 to 6, the auxiliary intake throttle valve 18 has a cylindrical portion 35 in a part of its valve body.
The cylindrical portion 35 has a step surface 36 at a part in the axial direction. Then, a hose clamp is detachably fitted to the cylindrical portion 35.
A hot water hose 32 is detachably held by the hose clamp 37.

The hose clamp 37 is made of an elastic resin. The hose clamp 37 includes a clamp body 38 having a C-shaped cross section removably fitted to the cylindrical portion 35 and a clamp body 38.
C-shaped clamp part 39 integrally formed on the outer peripheral surface of 38
And Then, the clamp portion 39 is fitted with the hot water hose 32 so as to be freely detachable.
And hold it. The axes of the clamp body 38 and the clamp portion 39 are orthogonal to each other in plan view.

A hook 40 is integrally formed with the clamp body 38, and the hook 40 is elastically engaged with the step surface 36 so that the clamp body 38 faces in the opposite direction from the step surface 36 in the axial direction of the cylindrical portion 35. To prevent them from moving. That is, even if the clamp body 38 is loaded from the hot water hose 32 via the clamp portion 39, the engagement of the hook 40 with the step surface 36 causes the clamp body 38 to be displaced in the axial direction from a predetermined position of the cylindrical portion 35. Is prevented.

2 and 7, front and rear fuel supply pipes 42 and 43 are arranged between the front cylinder row 2 and the rear cylinder row 3, and the left ends of these pipes 42 and 43 are connected to each other. Have been. A pressure reducing valve 44 is attached to the right end of the front fuel supply pipe 42 and serves as a fuel inlet here. Also,
A pressure regulating valve 45 is attached to the right end of the rear fuel supply pipe 43,
This is the fuel outlet, and the fuel flows as shown by the arrow in FIG.

7, the front fuel supply pipe 42 is supported by a rear bracket 48 which is screwed to the rear cylinder row 3 with bolts 47, and the rear fuel supply pipe 43 is connected to the front cylinder row 2 by bolts.
It is supported by a front bracket 50 screwed by 49. Further, the front fuel injection valve 52 provided in the middle of the front fuel supply pipe 42 injects the fuel F toward the combustion chamber of the rear cylinder row 3, and is provided in the middle of the rear fuel supply pipe 43. The bracket 48 moves the fuel F toward the combustion chamber of the front cylinder row 2.
It is made to inject.

In the above case, the rear bracket 48 and the front bracket 50 intersect with each other, and the front fuel injection valve 52 and the rear fuel injection valve 53 also intersect with each other in a side view. That is, the assembly of the above-described devices 42, 43, 48, and 50 is downsized, and according to this configuration, the engine angle of the front cylinder row 2 and the rear cylinder row 3 is narrow. 1, the layout relating to the fuel supply can be easily made.

(Effect of the Invention) According to the present invention, a pair of surge tanks are juxtaposed in the horizontal direction, one end is connected to a throttle body having a main intake throttle valve, and the other end extends so as to have a pair of branch pipes. In an intake system of an engine having connection pipes each of which has an extension end connected to each of the surge tanks, a heater having a hot water passage on an outer surface of the connection pipe between bases of the two branch pipes is attached and detached. The auxiliary intake throttle valve is provided on the side opposite to the connection pipe with respect to the heater, and the auxiliary intake throttle valve is detachably attached to the heater.

That is, as described above, since the heater is attached to the outer surface of the connection pipe, when the engine is driven, the air flowing to each surge tank through the connection pipe is heated by the heater. This is useful for driving an engine in a cold region, for example, to obtain a reliable fuel and to stabilize an idle state.

Moreover, as described above, since the heater is attached to the outer surface of the connecting pipe between the bases of the two branch pipes, the air diverted from the branch pipes of the connecting pipe is substantially reduced by the heater. This is beneficial because the heating is performed evenly and the idle state is more stable.

Also, as described above, the auxiliary intake throttle valve is attached to the heater on the side opposite to the connection pipe, so that the heater not only heats the air passing through the connection pipe as described above, but also The air passing through the auxiliary intake throttle valve is also heated more directly, which is advantageous in that the idle state is further stabilized.

In the above case, since the connection pipe, the heater, and the auxiliary intake throttle valve are detachably attached to each other, if the auxiliary intake throttle valve fails, the auxiliary intake throttle valve is removed and a new auxiliary intake throttle valve is removed. What is necessary is just to replace it with an intake throttle valve.

Therefore, when the auxiliary intake throttle valve is replaced, it is not necessary to replace even the portion forming the hot water passage as in the related art, that is, it is possible to prevent the replacement of the auxiliary intake throttle valve from being wasted. You.

Also, even if water leaks from the hot water passage of the heater, since this heater is provided separately from the auxiliary intake throttle valve, the water is suppressed from entering the auxiliary intake throttle valve, Therefore, even if water leaks from the hot water passage of the heater, it is possible to prevent the water from adversely affecting the auxiliary intake throttle valve such as freezing.

Moreover, since the inlet and outlet of the hot water in the heater extend downward, the hot water hose connected to the inlet and the outlet can be easily seen from above because of the branch pipe and the like. This is prevented by the heater, which improves the appearance of the engine.

[Brief description of the drawings]

1 shows an embodiment of the present invention. FIG. 1 is a partial sectional view of FIG. 2, FIG. 2 is an overall plan view, and FIG. 3 is III-III in FIG.
4 is a partial enlarged view of FIG. 2, FIG. 5 is a view taken along line VV of FIG. 4, and FIG. 6 is VI-VI of FIG.
FIG. 7 is a partial cross-sectional view taken along line VII-VII of FIG. 1 ... Engine, 5 ... Main intake throttle valve, 5a ... Throttle body, 7 ... Connection pipe, 7a ... Branch pipe, 9 ... Surge tank, 10 ... Surge tank, 18 ... Sub intake throttle valve , 19
... heater, 28 ... hot water passage, 30 ... inlet, 31 ... outlet, 32 ... hot water hose.

Claims (1)

(57) [Claims] 1. A pair of surge tanks are juxtaposed in a horizontal direction,
One end is connected to a throttle body having a main intake throttle valve, and the other end is extended so as to have a pair of branch pipes, and the intake air of an engine having a connection pipe having each extension end connected to each of the surge tanks. In the system, a heater having a hot water passage is detachably attached to an outer surface of the connection pipe between bases of the two branch pipes, and a sub intake throttle valve is provided on a side opposite to the connection pipe with respect to the heater. An auxiliary intake throttle valve for an engine, wherein the auxiliary intake throttle valve is detachably attached to the heater, and an inlet portion and an outlet portion of the hot water in the hot water passage extend downward from the heater. For heating device.