JPH0468458B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Industrial Field of Application The present invention provides a method for connecting a pair of carburetor bodies via a connecting member, which is disposed in the intake duct of each of the carburetor bodies. A throttle valve is fixed to a throttle valve shaft that is individually rotatably supported in each carburetor body, and a throttle lever is fixed to a portion of one of the throttle valve shafts that protrudes from the carburetor body. The present invention relates to a throttle valve shaft support structure for a multiple carburetor in which an interlocking mechanism is interposed between the two throttle valve shafts so that the other throttle valve shaft is interlocked with the one throttle valve shaft.

(2) Prior Art Conventionally, a throttle lever has generally been fixed to a throttle valve shaft rotatably supported by a carburetor body with its outer end being a free end.

(3) Problems to be Solved by the Invention However, in the above-mentioned conventional device, the portion of the throttle valve stem that protrudes from the carburetor body has a cantilever structure, so the portion that is wrapped around the throttle lever is As the wire is pulled, a bending moment acts on the throttle valve shaft, which may deform the throttle valve shaft and prevent smooth rotational movement. In particular, when two wires are wrapped around the throttle lever, the resultant force of the traction forces of those wires acts on the throttle valve shaft, causing a larger bending moment that impedes smooth operation of the throttle valve shaft. In the case of multiple carburetors, problems such as affecting the interlocking mechanism between the throttle valve shaft to which the throttle lever is fixed and the other throttle valve shaft, making it impossible to smoothly operate both valve shafts in synchrony. There is.

The present invention has been proposed in view of the above circumstances, and is intended to reduce the bending moment acting on the throttle valve shaft to which the throttle lever is fixedly attached in a multiple carburetor, thereby facilitating smooth rotation of the valve shaft. It is an object of the present invention to provide a throttle valve shaft support structure for a multiple carburetor, which not only ensures operation but also allows the other throttle valve shaft to always operate smoothly and synchronously with the valve shaft.

B. Structure of the invention (1) Means for solving the problem According to the first invention, in order to achieve the above object,
In the throttle valve shaft support structure of the multiple carburetor of the above type, one of the throttle valve shafts to which the throttle lever is fixed corresponds to the inner part of the throttle lever on one side of the throttle valve fixed to it. A portion of the carburetor body located outside the throttle lever and inside the interlocking mechanism is connected to a bracket that is located between the pair of carburetor bodies and is fixed to the connection member. According to the second aspect of the present invention, in the throttle valve shaft support structure for a multiple carburetor of the above type, one throttle valve shaft to which a throttle lever is fixed is supported by one throttle valve shaft fixed to the throttle valve shaft. On the side, a portion inside the throttle lever is connected to the corresponding carburetor body, and a portion outside the throttle lever and inside the interlocking mechanism is connected between the pair of carburetor bodies. Each is rotatably supported at the tip of the bracket to be arranged,
The base of the bracket is fixed to the connecting member so that its position can be adjusted around an axis parallel to the one throttle valve shaft.

(2) Effect Since both the inner and outer portions of the one throttle valve shaft with the throttle lever in between are supported by the carburetor body and the bracket,
As a whole, the portion of the one throttle valve shaft protruding from the carburetor body forms a double-supported beam structure. Therefore, even if the operating load applied from the throttle lever to the one throttle valve shaft is large, it can be stably and firmly received by the carburetor body and the bracket on one side of the throttle valve, so that the one throttle valve shaft Not only can deformation and misalignment of the part of the valve shaft inward from the throttle lever (particularly the part that crosses inside the carburetor body) can be effectively avoided, but also deformation of the part outside the throttle lever (particularly the part near the interlocking mechanism) can be avoided. It is also possible to effectively avoid misalignment and misalignment, thereby avoiding the effects of deformation and the like on the interlocking mechanism. As a result, the throttle valves on any throttle valve shaft can be rotated smoothly at all times.

In particular, according to the configuration of the second invention, the position of the base of the bracket can be adjusted with respect to the connecting member around an axis parallel to one throttle valve shaft, so that alignment of the bracket during assembly is facilitated. .

(3) Embodiment An embodiment of the present invention will be explained below with reference to the drawings. First, in FIG.
and the second vaporizer Cb constitute a double vaporizer,
These intake paths 1a and 1b are made parallel and connected to each other via a connecting member 2. Both vaporizers Ca, Cb
is a carburetor main body 3a having intake passages 1a and 1b,
The butterfly type throttle valves 5a, 5b arranged in the middle of the intake paths 1a, 1b are connected to the interlocking mechanism 6.
are linked and connected to each other through.

The vaporizer main body 3a in the first vaporizer Ca includes:
A throttle valve shaft 7a is rotatably supported across the intake passage 1a, and a throttle valve 5a is fixed to the throttle valve shaft 7a within the intake passage 1a. Both ends of this throttle valve shaft 7a are connected to the carburetor main body 3a.
A conventionally known dart pot device 8 is connected to the end of the throttle valve shaft 7a which projects outward from the second carburetor main body Cb and which projects outward from the second carburetor body Cb. A first idle mechanism 9 for determining the opening degree is connected.

Referring to FIGS. 2 and 3 together, from the carburetor main body 3a of the throttle valve shaft 7a to the second carburetor
Throttle lever 1 is located on the part that protrudes toward the Cb side.
0 is fixed, and this throttle lever 10 has 2
Two wires 11 and 12 are wound around. That is, two winding grooves 13 and 14 are provided adjacent to each other on the outer periphery of the throttle lever 10.
Both wires 11 and 12 have their winding grooves 13 and 14
are wrapped around each. Moreover, one wire 1
1 is a wire that is linked to throttle operation, and the other wire 12 is a wire that works to generate throttle pressure according to the throttle opening in an automatic transmission (not shown). For example, the direction of traction differs by 90 degrees.

A return spring 15a is interposed between the carburetor main body 3a and the throttle lever 10, and the spring force of the return spring 15a causes the throttle lever 10, that is, the throttle valve shaft 7a, to move in the direction of closing the throttle valve 5a. is biased to rotate.

The throttle lever 10 is integrally provided with a contact arm portion 16 extending toward the first carburetor Ca side. On the other hand, a regulating protrusion 17 is provided on the connecting member 2 so as to protrude from the front of the throttle valve shaft 7a in the valve closing rotation direction and facing the abutment arm 16.
A screw member 18 that abuts the abutting arm portion 16 is screwed together so that it can move forward and backward. The throttle valve 5a is in a fully closed state with the screw member 18 in contact with the contact arm 16, and therefore, the fully closed position of the throttle valve 5a is determined by the forward and backward positions of the screw member 18. Moreover, the head 18a of the screw member 18 and the regulating protrusion 1
A spring 19 is compressed between the springs 1 and 7.
The forward and backward positions of the screw member 18 are maintained by the spring force 9.

The connecting member 2 includes a cylindrical portion 20 that is integrally protruded from the carburetor body 3a to form the downstream end of the intake path 1a.
The first vaporizer has a circular hole 21 inserted through the a.
a mounting portion 22 coupled to the Ca vaporizer main body 3a;
The carburetor body 3b forms the downstream end of the intake passage 1b.
a mounting part 24 that is coupled to the lower part of the carburetor main body 3b of the second carburetor Cb and has an arcuate notch 23 that fits into the lower part of the cylindrical part 20b that is integrally provided with the cylindrical part 20b;
It is integrally formed with a connecting part 25 that connects both the mounting parts 22 and 24, and a substantially U-shaped support part 26 that opens upward is integrally formed in the approximate center of the connecting part 25. provided.

The base end of a bracket 28 having a circular bearing 27 at its tip is held in the support part 26, and a screw member 29 passing through the base ends of the support part 26 and the bracket 28 in parallel with the throttle valve shaft 7a is fitted with a nut. 30 is screwed together and tightened, the bracket 28 is connected to the carburetor main body 3 via the connecting member 2.
It is fixed to a and 3b. A portion of the throttle valve shaft 7a on the outer side of the throttle lever 10 is supported by the bearing portion 27 of the bracket 28 via a bearing 31. Moreover, when the nut 30 is loosened, the bracket 28 is swingable around the screw member 29, and is adjusted to support the throttle valve shaft 7a so that no unreasonable force is applied to the throttle valve shaft 7a. Is possible.

The throttle valve shaft 7b in the second carburetor Cb is
It is rotatably supported by the carburetor main body 3b so as to be coaxial with the throttle valve shaft 7a of the first carburetor Ca and across the intake passage 1b.
An interlocking mechanism 6 is provided between the end of the throttle valve shaft 7b protruding from the carburetor main body 3b on the Ca side and the throttle valve shaft 7a of the first carburetor Ca.

This interlocking mechanism 6 includes one throttle valve shaft 7a.
a connecting arm portion 32 fixedly attached to the connecting arm portion 32;
A connecting arm 33 fixed to the other throttle valve shaft 7b opposite to the connecting arm 33, a connecting screw member 34 penetrating through the connecting arm 33 and screwed to the connecting arm 32, and a connecting screw member 34. Surrounding both connecting arms 32, 33
The interlocking mechanism 6 rotates the other throttle valve shaft 7b in response to the rotational movement of one throttle valve shaft 7a.

A return spring 15b is interposed between the end of the throttle valve shaft 7b protruding from the carburetor body 3b on the side opposite to the first carburetor Ca and the carburetor body 3b, and the spring of this return spring 15b The force causes the throttle valve 5b to rotate in the valve closing direction.

Next, to explain the operation of this embodiment, the throttle lever 10, that is, the throttle valve shaft 7a, rotates in response to the pulling operation of one of the wires 11, and the throttle valve shaft 7a rotates through the interlocking mechanism 6.
b rotates, and the throttle valves 5 of both carburetors Ca and Cb
a and 5b operate in conjunction to open the valve. At this time, a tensile force is also applied to the other wire 12, and a throttle pressure corresponding to the throttle opening is generated in the automatic transmission.

The pulling directions of the wires 11 and 12 are different from each other, and a relatively large operating load acts on the throttle valve shaft 7a in the direction of the resultant force of the pulling forces of both the wires 11 and 12. However, the throttle valve shaft 7
a is a carburetor main body 3a inwardly of the throttle lever 10 on one side of the throttle valve 5a.
Furthermore, the outer portions of the throttle lever 10 are rotatably supported by the brackets 28, so that the throttle lever 10 of the throttle valve shaft 7a can be moved between the throttle valve shaft 7a and the throttle valve shaft 7a on one side of the throttle valve 5a. Both the inner and outer portions sandwiched between the carburetor body 3a and the bracket 28 are supported by the carburetor body 3a and the bracket 28, respectively, and as a whole, the portion of the throttle valve shaft 7a protruding from the carburetor body 3a has a double-supported beam structure. becomes. As a result, the operating load applied from the throttle lever 10 to the throttle valve shaft 7a can be stably and firmly received by the carburetor main body 3a and the bracket 28 on one side of the throttle valve 5a. Deformation and misalignment of the portion that crosses the intake passage 1a can be effectively avoided, and the throttle valve 5a can always be rotated smoothly in conjunction with the throttle valve shaft 7a.

Moreover, since the bracket 28 can be swung around an axis parallel to the throttle valve shaft 7a by loosening the nut 30, the axis of the bearing 31 can be adjusted to match the axis of the throttle valve shaft 7a during installation. This is possible, and by supporting the throttle valve shaft 7a with the bracket 28, the throttle valve shaft 7a will not be twisted due to excessive force.

C. Effects of the Invention As described above, according to the present invention, throttle valve shafts are individually provided in a pair of carburetor bodies that are connected to each other via a connecting member, and an interlocking mechanism is established between the throttle valve shafts. In the interposed multiple carburetor, one of the throttle valve shafts to which the throttle lever is fixed has a portion inward from the throttle lever on one side of the throttle valve fixed to the shaft to the corresponding carburetor body. In addition, the portions outside the throttle lever and inside the interlocking mechanism are rotatably supported by brackets that are located between the carburetor bodies and are fixed to the connection member, so that the one Both the inner and outer portions of the throttle valve shaft with the throttle lever in between are supported by the carburetor body and the bracket, so that the carburetor of the one throttle valve shaft as a whole is supported by the carburetor body and the bracket. The part protruding from the main body has a double-supported beam structure, so even if the operating load applied from the throttle lever to one throttle valve shaft is large, it is stabilized by the carburetor main body and bracket on one side of the throttle valve. It can be held well and firmly, and not only can it effectively avoid deformation and misalignment of the inner part of the throttle valve shaft (particularly the part that crosses inside the carburetor body), but also It is also possible to effectively avoid deformation and misalignment of the side portion (particularly the portion near the interlocking mechanism), thereby avoiding the influence of the deformation etc. on the interlocking mechanism. As a result, not only can the throttle valve on one throttle valve shaft always rotate smoothly, but also the throttle valve on the other throttle valve shaft can always rotate smoothly in synchronization with it. The air-fuel ratio of the air-fuel mixture by each carburetor in the multiple carburetor can be controlled accurately and accurately, which can also contribute to reducing emissions. Further, by fixing the bracket to the connecting member for connecting the pair of carburetor bodies, the supporting structure of the bracket can be simplified to that extent, which can contribute to cost reduction and improvement of assembly workability.

Particularly, according to the second invention, the position of the base portion of the bracket, which rotatably supports the one throttle valve shaft at its tip, is adjustable on the connecting member around an axis parallel to the one throttle valve shaft. Since the bracket is firmly fixed to the bracket, centering of the bracket during assembly is easy and maintainability is also improved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view of a dual carburetor, FIG. 2 is a view taken in the direction of the arrow in FIG. 1, and FIG. 3 is an enlarged perspective view of FIG. be. 1a, 1b...Intake path, 2...Connecting member, 3
a, 3b... Carburetor body, 7a, 7b... Throttle valve shaft, 10... Throttle lever, 11, 1
2... wire, 26... support section, 28... bracket, 31... bearing, Ca, Cb... carburetor.

Claims (1)

[Claims] 1. A connecting member 2 between a pair of carburetor bodies 3a, 3b.
A throttle valve 5 is connected to the main body 3a, 3b of the carburetor through a
a, 5b, and throttle valve shafts 7a, 7 which are individually rotatably supported by their respective carburetor bodies 3a, 3b.
b, and one of the throttle valve shafts 7a,
A throttle lever 10 is fixed to a portion protruding from the carburetor main body 3a, and one throttle valve shaft 7a
In a throttle valve shaft support structure for a multiple carburetor, an interlocking mechanism 6 is interposed between both valve shafts 7a and 7b so that the other throttle valve shaft 7b is interlocked with each other.
On one side of the throttle valve 5a fixed to the one throttle valve shaft 7a, a portion inside the throttle lever 10 corresponds to the carburetor main body 3a, and a portion outside the throttle lever 10 corresponds to the carburetor main body 3a. In addition, the inner part of the interlocking mechanism 6 is
A throttle valve shaft support structure for a multiple carburetor, characterized in that the shafts are rotatably supported by brackets 28 which are located between the pair of carburetor bodies 3a and 3b and are fixed to the connecting member 2. 2 Connecting member 2 between the pair of carburetor bodies 3a and 3b
A throttle valve 5 is connected to the main body 3a, 3b of the carburetor through a
a, 5b, and throttle valve shafts 7a, 7 which are individually rotatably supported by their respective carburetor bodies 3a, 3b.
b, and one of the throttle valve shafts 7a,
A throttle lever 10 is fixed to a portion protruding from the carburetor main body 3a, and one throttle valve shaft 7a
In a throttle valve shaft support structure for a multiple carburetor, an interlocking mechanism 6 is interposed between both valve shafts 7a and 7b so that the other throttle valve shaft 7b is interlocked with each other.
On one side of the throttle valve 5a fixed to the one throttle valve shaft 7a, a portion inside the throttle lever 10 corresponds to the carburetor main body 3a, and a portion outside the throttle lever 10 corresponds to the carburetor main body 3a. In addition, the inner part of the interlocking mechanism 6 is
The brackets 28 are rotatably supported at the tips of the brackets 28 disposed between the pair of carburetor bodies 3a and 3b, and the bases of the brackets 28 are connected to the connecting member 2 with the one throttle valve shaft 7a. A throttle valve shaft support structure for a multiple carburetor, characterized in that the shaft is fixed so that its position can be adjusted around parallel axes. 3. The connecting member 2 includes a support portion 26 formed in a substantially U-shape to hold the base of the bracket 28 from both sides along the axis of the one throttle valve shaft 7a, and the support portion 26 and the bracket 3. A throttle valve shaft support structure for a multiple carburetor according to claim 2, wherein said bracket 28 is fixed to said support portion 26 by tightening a screw member 29 passing through a base portion of said bracket 28.