JPH11223156A - Carbureter with hot water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly heat a throw nozzle by mounting a rod-like hot water heater having a hot water chamber on an intermediate part and the hose joints on the upper and lower both ends, in a heat conductive hole with the inclined attitude. SOLUTION: A piston type throttle valve 4 for opening and closing a venturi 2a of an inlet path 2, is slidably accomodated in a cylindrical valve body 3 formed on an upper part of a carbureter main body 1, and a float chamber body 6 comprising a main nozzle 7 and a throw nozzle 8 is mounted on a lower face of the carbureter main body 1. A heat conductive hole inclined to the axis 1 of the inlet path 2 and extended in the vertical direction is formed as close to the throw nozzle 8 as possible on one side wall in the transverse direction of the carbureter main body 1 of the carbureter as a screw hole, and a hot water heater 21 made of a material of high heat conductivity, is screwed in the hole. The hot water heater 21 is formed into the shape of a hollow rod, and the heating property of the throw nozzle 8 can be improved by allowing the engine cooling water to flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carburetor body having a main chamber and a slow nozzle which are open at the bottom of an intake passage and a float chamber body forming a float chamber at a lower part thereof, and an upper part of the carburetor body. In regards to a carburetor with a valve cylinder that houses a piston-type throttle valve that opens and closes the intake passage, especially in cold and humid conditions, the moisture in the intake freezes on the slow nozzle and causes idling or low-speed operation of the engine. The present invention relates to an improvement of a vaporizer provided with a hot water heater for preventing the vaporization.

[0002]

2. Description of the Related Art Conventionally, as a vaporizer with such a hot water heater, a pair of hose joints is protruded from one side of a flat heater body having a hot water chamber to constitute a hot water heater. One that is bonded to a flat outer surface of a vaporizer main body is known (see Japanese Utility Model Laid-Open No. 60-147748).

[0003]

In the above-mentioned conventional structure, the carburetor main body can be easily heated only by attaching the hot water heater to the carburetor main body. It has the advantage that it is not necessary to provide sealing means to prevent hot water from leaking. However, it is structurally difficult to shorten the distance between the slow nozzle to be heated and the hot water heater, so that the slow nozzle can be quickly heated. Is difficult.

The present invention has been made in view of the above circumstances, and provides a vaporizer with a hot water heater having a simple structure capable of rapidly heating a slow nozzle while taking advantage of the conventional advantages. Aim.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a float chamber body which forms a float chamber at a lower portion of a carburetor body having a main nozzle and a slow nozzle which are opened at an intake passage and a bottom surface thereof. , The float chamber of which is located on the top of the carburetor body and has a valve cylinder that houses a piston-type throttle valve that opens and closes the intake passage. The axis of the float chamber is located upstream of the slow nozzle in the intake passage. In the meantime, a rod-shaped hot water heater with a hot water chamber in the middle and hose joints at the upper and lower ends is located near the slow nozzle, and the axis of the hot water heater is outside the float chamber body on the downstream side of the intake passage. A first feature is that the carburetor is mounted on a heat conduction hole formed in one side wall of the carburetor body in a posture inclined toward the axis of the intake passage so as to come to the side.

According to the first feature, since the heat conduction hole can be formed in the vaporizer main body in the vicinity of the slow nozzle without deteriorating its strength, the rod-shaped hot water heater attached to the heat conduction hole is provided. Thereby, the slow nozzle can be quickly heated. In addition, the angle of inclination of the hot water heater with respect to the intake path is minimized, so that interference between the hot water heater and the float chamber disposed around the heater, the idle opening adjustment screw, and other carburetor control units is avoided. In addition, the connection of the hot water hose to the lower hose joint of the hot water heater can be easily performed without being hindered by the float chamber body.
Needless to say, it is not necessary to provide a seal member between the vaporizer main body and the hot water heater as in the conventional case.

According to the present invention, in addition to the first feature, a valve drive shaft supported on the upper part of the valve cylinder and driving the opening and closing of the throttle valve is arranged downstream of the axis of the hot water heater. Is a second feature.

According to the second feature, the connection of the hot water hose to the upper hose joint can be easily performed without disturbing the valve drive shaft.

Further, in the present invention, in addition to the second feature, a hose holder for holding a hot water hose connected to an upper hose joint of the hot water heater is integrally formed on a lid plate joined to an upper end of the valve cylinder. This is the third feature.

According to the third feature, the hot water hose connected to the upper hose joint can be easily held by using the cover plate of the valve cylinder.

Further, in addition to the first, second or third feature, the present invention provides a starting device for supplying a rich air-fuel mixture to an intake passage at the time of starting on a side wall of a carburetor body opposite to a hot water heater. This is a fourth feature.

[0012] According to the fourth feature, the hot water heater and the starting device can be easily assembled to the carburetor body without interfering with each other. In addition, the hot water heater and the starting device are arranged on both sides of the carburetor body in a well-balanced manner, so that the size of the carburetor due to the starting device can be minimized.

Further, in addition to the second feature, the present invention further comprises, at one end of the valve drive shaft, a throttle drum for operating wire connection, which is disposed outside the hot water heater, and is fixed to the throttle drum. A fifth feature is that a return spring biasing in a valve closing direction is disposed around a valve drive shaft between the throttle drum and the carburetor body.

According to the fifth aspect, the throttle drum is arranged on the same side as the hot water heater, but interference between the hot water hose connected to the upper hose joint and the throttle drum can be avoided. Moreover, the space around the valve drive shaft generated between the carburetor body and the throttle drum can be effectively used for installing the return spring.

Further, in a sixth aspect of the present invention, in addition to the fifth aspect, a throttle sensor for detecting the opening of the throttle valve is attached to the other end of the valve drive shaft.

According to the sixth feature, the throttle drum and the throttle sensor are mounted on both ends of the valve drive shaft in a well-balanced manner, and the enlargement of the carburetor due to the throttle sensor can be suppressed as much as possible.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments of the present invention shown in the accompanying drawings.

FIG. 1 is a side view of a carburetor with a hot water heater mounted on a motorcycle engine, FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1, FIG. 3 is a view taken in the direction of arrow 3 in FIG. 1, and FIG. 5 is a sectional view taken along line 4-4, FIG. 5 is a sectional view taken along line 5-5 in FIG. 4, and FIG.
7 is a sectional view taken along line 7-7 of FIG. 4, and FIG. 8 is a sectional view taken along line 8-8 of FIG.

1 to 4, a carburetor C has a carburetor main body 1 having a horizontal intake passage 2, an upstream end of the intake passage 2 is connected to an air cleaner A, and a downstream end of the carburetor is an intake air of the engine. Connects to tube Ei. Therefore, the intake air of the engine flows through the intake passage 2 in the direction of the arrow.

A piston-type throttle valve 4, which rises and lowers to open and close a venturi 2a at the axial center of the intake passage 2, is slidably mounted on a cylindrical valve cylinder 3 integrally formed on the upper portion of the carburetor body 1. To be housed. A float chamber 6 defining a float chamber 5 is attached to the lower surface of the vaporizer main body 1.

The upper end of the main nozzle 7 and the lower end of the slow nozzle 8 are opened at the lower inner surface of the venturi 2a, and the lower ends thereof communicate below the fuel oil level of the float chamber 5 via the main jet 9 and the slow jet 10, respectively. . The main nozzle 7 is inserted with a needle valve 11 attached to the center of the throttle valve 4 and the slow nozzle 8 is inserted.
Are arranged to be close to the lower edge on the downstream side when the throttle valve 4 is lowered to the idle position. Therefore, the slow nozzle 8 is disposed downstream of the main nozzle 7 on the intake path 2 side. The float chamber 6 has a substantially cylindrical cup shape, and is arranged such that its axis O ₂ is located on the upstream side of the intake path 2 from the axis of the slow nozzle 8. It is arranged coaxially.

[0022] The upper end of the valve tube 3, deviate to the intake passage 2 downstream from the center, left and right bearing portions 3a which are arranged perpendicularly to the axis O ₁ of the intake passage 2, 3b are integrally A connecting pin 14 at the tip of an operating arm 13 formed and fixed to a valve drive shaft 12 rotatably supported by these is engaged with a horizontally extending connecting groove 16 of a connector 15 connected to the upper end of the throttle valve 4. A spring 17 for eliminating play between the connecting pin 14 and the groove 16 is connected between the connecting pin 14 and the connector 15.

When the intake air of the engine flows through the intake passage 2 as shown by the arrow, the rotation of the valve drive shaft 12 causes the operating arm 13 to move up and down, that is, open and close the throttle valve 4, so that the intake air flow rate is increased. Can be controlled. At this time, if the throttle valve 4 is at the idle position or the low opening position, the fuel stored in the float chamber 5 is ejected from the slow nozzle 8, and if the throttle valve 4 reaches the high opening position, it is ejected from the main nozzle 7. The injected fuel is supplied to the engine together with the intake air flowing through the intake passage 2.

The valve cylinder 3 has an open upper end for storing and removing the throttle valve 4 and the operating arm 13 and the like, and a lid plate 18 is joined to the open end with screws 19.

In FIG. 1 and FIG. 6, a heat conducting hole 20 extending in the vertical direction as close as possible to the slow nozzle 8 is provided as a screw hole on one lateral wall of the vaporizer main body 1.
A hot water heater 21 made of a material having a high thermal conductivity, for example, brass, is screwed to this.

The heater 21 has a hollow rod shape.
Hollow bolt part 22 having hexagonal enlarged head 22a at one end
And a pair of upper and lower hose joints 23 and 24 connected to both ends of the bolt portion 22, respectively.
Is a hot water chamber 25. The hot water chamber 25 and the hollow portions of the hose joints 23 and 24 are formed as a series of flow passages, and the flow passages are provided with orifices 26 for controlling the amount of hot water flowing therethrough as necessary. Hose fitting 2
3 and 24 are smaller in diameter than the bolt portion 22. The hot water heater 21 configured as described above inserts the hose joint 24 on the opposite side of the enlarged head 22a into the heat conduction hole 20 and then operates the wrench engaged with the hexagonal head 22a to form the bolt portion 22.
Is screwed into the heat conduction hole 20 and tightened to be detachably fixed to the carburetor body 1.

The heat conduction hole 20 is formed so that the axis O ₃ of the hot water heater 21 passes outside the float chamber 6 on the downstream side of the intake passage 2 and outside of the bearing 3 a on the upstream side of the intake passage 2. , Are arranged with a posture inclined with respect to the axis O ₁ of the intake passage 2. The upper and lower hose joints 23 and 24 of the hot water heater 21 have a hot water introducing hose 27 and a hot water deriving hose 2 connected to a cooling water passage of an engine (not shown).
8 are respectively connected.

As shown in FIGS. 1 and 5, a throttle drum 30 is fixed to one end of the valve drive shaft 12 at a position laterally outside the carburetor C from the axis O ₃ of the hot water heater 21. A return spring 31 composed of a torsion coil spring that urges the throttle drum 30 in the closing direction of the throttle valve 4 is connected between the and the valve cylinder 3 so as to surround the bearing 3a. An inner wire 32a of a Bowden wire 32 (operation wire) connected to a throttle operation member of a motorcycle (not shown) is connected to the throttle drum 30.
Is supported by a wire holder 33 formed integrally with the cover plate 18 of the valve cylinder 3.

A housing 36 of a throttle sensor 35 is mounted on the bearing 3b opposite to the hot water heater 21, and a rotor 37 of the sensor 35 is connected to the other end of the valve drive shaft 12.

The cover plate 18 is integrally formed with a hose holder 39 projecting directly above the upper hose joint 23, and the hot water introduction hose 27 is held by an Ω-shaped holding hole 40 provided in the hose holder 39. .

7 and 8, the main body 1 of the vaporizer is
A starting device 41 is provided on the side wall opposite to the hot water heater 21. The starting device 41 includes a bypass 42 that bypasses the venturi 2 a and communicates with the intake passage 2.
A starting nozzle 44 communicating below the fuel oil level of the float chamber 5 via a valve, a piston valve 45 having a needle valve 46 inserted into the starting nozzle 44 to open and close the bypass passage 42, and a piston valve 45 A control unit 47 that automatically opens and closes according to the engine temperature.
When the engine is started in the cold state and when the engine is warmed up, the piston valve 45 is automatically opened at an appropriate opening, whereby a rich mixture is generated in the bypass passage 42, and the rich air-fuel mixture is generated.
Through the engine.

In FIG. 1, reference numeral 48 denotes a screw for adjusting the idle opening of the throttle valve 4 and 49 denotes an air bleed adjusting screw for the slow nozzle 8.
1 is provided on the side wall of the carburetor body 1 on the same side as the carburetor 1.

Next, this embodiment will be described.

During the operation of the engine (not shown) equipped with the carburetor C, a part of the cooling water (hot water) flowing through the cooling water passage flows from the hot water introducing hose 27 into the hot water chamber 25 and passes through the hot water outlet hose 28 to the engine. Then, the hot water heater 21 is heated by refluxing to the cooling water channel. The bolt portion 22 of the heated hot water heater 21 is screwed into the heat conduction hole 20 of the carburetor main body 1 and forms an extremely wide close contact surface with the carburetor main body 1. Effective heat conduction is performed from the gas to the vaporizer main body 1. Therefore,
Even in cold weather, the temperature of the vaporizer main body 1, especially the slow nozzles 8 adjacent to the hot water heater 21 can be quickly raised, so that freezing of water is generated in them, that is, icing is prevented, and the slow nozzle by icing is prevented. 8, a large change in the effective opening area can be avoided, and normal idling or low-speed operation of the engine can be ensured.

By the way, the heat conduction hole 20 for mounting the rod-shaped hot water heater 21 can be easily formed in the carburetor body 1 close to the slow nozzle without impairing its strength. In addition, the float chamber 6 is arranged so that its axis O ₂ is located upstream of the slow nozzle 8 on the intake path 2, and the valve drive shaft 12 is arranged on the downstream side of the throttle valve 4 in the intake path 2. On the hot water heater 21
Is arranged so that its axis O ₃ passes through the outside of the float chamber 6 on the downstream side of the intake path 2 and the outside of the valve drive shaft 12 on the upstream side of the intake path 2, so that the inclination angle of the hot water heater 21 with respect to the intake path 2. Can be minimized to avoid interference between the hot water heater 21 and the idle opening adjustment screw 48 and the air bleed adjustment screw 49 disposed in the vicinity thereof, and the upper and lower hose joints 23, 24 The hot water introduction and the connection of the outlet hoses 27 and 28 can be easily performed without being interrupted by the float chamber 6 and the valve drive shaft 12.

Further, since the hose plate 39 for holding the hot water introduction hose 27 connected to the upper hose joint 23 is integrally formed on the cover plate 18 of the valve cylinder 3, the hose 27 can be connected without increasing the number of parts. It can be held stably.

At one end of the valve drive shaft 12, a throttle drum 30 disposed outside the hot water heater 21 is fixed, and a return spring 31 for urging the throttle drum 30 in the direction in which the throttle valve 4 is closed. To the bearing 3a
Since the throttle drum 30 is disposed around, the throttle drum 30 is disposed on the same side as the hot water heater 21, but interference between the hot water introduction hose 27 connected to the upper hose joint 23 and the throttle drum 30 can be avoided. In addition, the space around the valve drive shaft 12 generated between the carburetor body 1 and the throttle drum 30 can be effectively used for the installation of the return spring 31, thereby contributing to the downsizing of the carburetor C.

Further, since the rotor 37 of the throttle sensor 35 for detecting the opening of the throttle valve 4 is connected to the other end of the valve drive shaft 12, the throttle drum 30 and the throttle sensor 35 are connected to both ends of the valve drive shaft 12. And the size of the carburetor C due to the throttle sensor 35 can be minimized.

Since the starting device 41 is provided on the side wall of the carburetor body 1 opposite to the hot water heater 21, the hot water heater 21 and the starting device 41 can be easily assembled to the carburetor body 1 without interfering with each other. be able to. In addition, the hot water heater 21 and the starting device 41 can be arranged on both sides of the carburetor body 1 in a well-balanced manner, and the size of the carburetor C due to the starting device 41 can be minimized.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention. For example, the hot water heater 21 can be attached to the heat conduction hole 20 by press fitting. Also lower hose joint 2
4, a hot water introduction hose 27 is connected to the upper hose joint 23, and a hot water outlet hose 28 is connected to the upper hose joint 23, so that the flow direction of the hot water can be reversed from that of the embodiment.

[0041]

As described above, according to the first feature of the present invention, the float chamber body is arranged so that its axis is located on the upstream side of the intake passage from the slow nozzle, while the hot water chamber and
A rod-shaped hot water heater with hose joints at the upper and lower ends is fitted to the intake passage axis so that the hot water chamber is close to the slow nozzle and the axis of the hot water heater is outside the float chamber downstream of the intake passage. It is attached to the heat conduction hole formed on one side wall of the carburetor body in the inclined position, so that the heat conduction hole can be formed in the carburetor body close to the slow nozzle without impairing its strength. Therefore, the slow nozzle can be quickly heated by the rod-shaped hot water heater attached to the heat conduction hole, and the icing can be effectively prevented. In addition, while minimizing the angle of inclination of the hot water heater with respect to the intake path, it is possible to avoid interference between the hot water heater and the float chamber, idle opening adjusting screw, and other carburetor control units disposed therearound. In addition, the connection of the hot water hose to the lower hose joint of the hot water heater can be easily performed without disturbing the float chamber body. In addition, there is no need to provide a seal member between the vaporizer body and the hot water heater, and the structure is simple.

According to the second feature of the present invention, the valve drive shaft supported on the upper part of the valve cylinder and driving the opening and closing of the throttle valve is disposed so that it is located downstream of the axis of the hot water heater on the intake path. Therefore, the connection of the hot water hose to the upper hose joint of the hot water heater can be easily performed without disturbing the valve drive shaft.

According to the third feature of the present invention, the hose holder for holding the hot water hose connected to the upper hose joint of the hot water heater is integrally formed on the lid plate joined to the upper end of the valve cylinder. In addition, the hot water hose connected to the upper hose joint can be easily held by using the cover plate of the valve cylinder, thereby suppressing an increase in the number of parts.

According to the fourth aspect of the present invention, a starting device for supplying a rich air-fuel mixture to the intake passage at the time of starting is provided on the side wall of the carburetor opposite to the hot water heater. The starting devices can be easily assembled to the carburetor body without interfering with each other. In addition, the hot water heater and the starting device are arranged on both sides of the carburetor body in a well-balanced manner, so that the size of the carburetor due to the starting device can be minimized.

Further, according to a fifth aspect of the present invention,
Located at one end of the valve drive shaft outside the hot water heater,
The throttle drum for connecting the operation wire is fixed, and a return spring for biasing the throttle drum in the valve closing direction of the throttle valve is provided around the valve drive shaft between the throttle drum and the carburetor body. Is arranged on the same side as the hot water heater, it is possible to avoid interference between the hot water hose connected to the upper hose joint and the throttle drum. In addition, the space around the valve drive shaft generated between the carburetor body and the throttle drum can be effectively used for installing the return spring, and the carburetor can be made compact.

Further, according to a sixth aspect of the present invention,
Since the throttle sensor that detects the opening of the throttle valve is attached to the other end of the valve drive shaft, the throttle drum and throttle sensor are attached to both ends of the valve drive shaft in a well-balanced manner, and the size of the carburetor using the throttle sensor is minimized. Can be suppressed.

[Brief description of the drawings]

FIG. 1 is a side view of a vaporizer with a hot water heater according to a first embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1;

FIG. 3 is a view taken in the direction of arrow 3 in FIG. 1;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 1;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 4;

FIG. 8 is a sectional view taken along line 8-8 in FIG. 7;

[Explanation of symbols]

C: Vaporizer 1 ... Vaporizer body 2 ... Air intake path 3 ... Valve cylinder 4 ... Throttle valve 5 ... Float chamber 6 ···· Float chamber 7 ··· Main nozzle 8 ··· Slow nozzle 12 ··· Valve drive shaft 18 ··· Lid plate 20 ··· Thermal conduction hole 21 ···・ ・ Hot water heater 23 ・ ・ ・ ・ Upper hose joint 24 ・ ・ ・ ・ ・ ・ Lower hose joint 25 ・ ・ ・ ・ Hot water chamber 26 ・ ・ ・ ・ Orifice 27 ・ ・ ・ ・ Hot water hose (Hot water introduction hose) 28 ・ ・ ・ ・Hot water hose (hot water outlet hose) 30 ··· Throttle drum 31 ··· Return spring 32 ··· Operation wire 35 ··· Throttle sensor 37 ··· Rotor 39 ··· Hose holder 41 ···· Starting device O ₁ ··· Axis line of intake path O ₂ ··· Float chamber Axis O ₃ ··· axis of hot water heater

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[Procedure amendment]

[Submission date] February 12, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction contents]

Next, the operation of this embodiment will be described.

Claims (6)

[Claims] 1. A float chamber body (5) forming a float chamber (5) at a lower portion of a carburetor body (1) having an intake passage (2) and a main nozzle (7) and a slow nozzle (8) opening at a bottom surface thereof. 6), and on the top of the vaporizer body (1),
Piston type throttle valve (4) that opens and closes the intake path (2)
In a carburetor having an upright valve cylinder (3) for housing the float chamber (6), the float chamber (6) is arranged so that its axis (O ₂ ) is located upstream of the slow nozzle (8) and the intake passage (2). On the other hand, a rod-shaped hot water heater (21) having a hot water chamber (25) in the middle and hose joints (23, 24) at the upper and lower ends is provided.
The hot water chamber (25) approaches the slow nozzle (8), and the air is drawn so that the axis (O ₃ ) of the hot water heater (21) is located on the downstream side of the air intake path (2) of the float chamber body (6). in an inclined position with respect to the axis (O ₁₎ of the road (2), characterized in that mounted on the heat conducting hole formed in one side wall of the carburetor body (1) (20), vaporized hot-water heater vessel. 2. A hot water heater (21) according to claim 1, further comprising a valve drive shaft (12) supported on the upper part of the valve cylinder (3) for driving the opening and closing of the throttle valve (4).
A carburetor with a hot water heater, wherein the carburetor is arranged so as to be located downstream from the axis (O ₃ ) of the intake passage (2). 3. A hot water heater connected to an upper hose joint (23) of a hot water heater (21), the cover plate (18) being joined to an upper end of a valve cylinder (3). A vaporizer with a hot water heater, wherein a hose holder (39) for holding a hose (27) is integrally formed. 4. A rich air-fuel mixture is supplied to an intake passage (2) at the time of start-up on a side wall of a carburetor body (1) on a side opposite to a hot water heater (21). A carburetor with a hot water heater, characterized by comprising a starting device (41) that performs heating. 5. A throttle drum (30) for connecting an operation wire (32), which is arranged outside a hot water heater (21), is fixed to one end of a valve drive shaft (12). And the throttle drum (3
0) is disposed around the valve drive shaft (12) between the throttle drum (30) and the carburetor body (1), for biasing the return valve (0) in the closing direction of the throttle valve (4). Characterized by a vaporizer with a hot water heater. 6. A hot water system according to claim 5, wherein a throttle sensor (35) for detecting an opening of the throttle valve (4) is attached to the other end of the valve drive shaft (12). Vaporizer with heater.