JPS6248953A - Carburetor - Google Patents

Abstract

PURPOSE:To prevent overload to a block from occurring, by making a metallic distance collar contact with each flange part at both ends of the plastic mixture body block, while inserting a metallic bolt into this collar, and connecting the block to it. CONSTITUTION:Each of flange parts 21 and 22 projected outward is installed in both ends of a plastic mixture body block 9. And, holding this mixture body block 9 in between, a metallic bolt 29 clamping an air horn block 10 and a throttle body block 8 with each other is inserted into a metallic distance collar 31 whose both ends are made contact with these flange parts 21 and 22. With this constitution, undue load is prevented from being imposed on the mixture body block 9, thus such an aim of making the block into thinness and uniform thickness is well promotable.

Description

Detailed Description of the Invention A0 Object of the Invention (1) Industrial Application Field The present invention provides a carburetor main body that integrally connects an air horn block, a mixture body block, and a throttle body block in this order. The present invention relates to a vaporizer configured.

(2) Prior Art Conventionally, when each block is made of zinc alloy or aluminum alloy, the blocks are fastened to each other by screw members. Further, at least when the mixture body block is made of synthetic resin, the air horn block and the throttle body block are fastened to each other by a through bolt passing through the three-mixture differential lock.

(3) Problems to be Solved by the Invention However, if the mixture body blocks are made of synthetic resin and the blocks are interconnected with screw members, the air cleaner installed on the top of the carburetor body Since the mixture body block also has to bear the load of such heavy objects, the resin wall thickness of the mixture body block becomes large, which is undesirable in terms of cost and forming accuracy. In addition, if the structure is fastened with through bolts, the wall thickness around the bolt insertion hole provided in the mixture body block will inevitably become thicker because it is not possible to provide a cast-out space between it and the main part of the block. . Furthermore, the difference in thermal expansion between the bolt and the synthetic resin may lead to a decrease in bolt fastening force.

The present invention has been made in view of the above circumstances, and is intended to avoid excessive loads being applied to synthetic resin mixture body cloths, to equalize the wall thickness of mixture body cloths, and to reduce the bonding force. It is an object of the present invention to provide a vaporizer that can prevent the occurrence of a drop in fuel consumption.

B1 Structure of the Invention (1) Means for Solving the Problems According to the present invention, at least the mixture body block is formed of synthetic resin, and the throttle body pro-7
The air horn block and the throttle body block are made of metal, and flanges projecting outward are provided at both ends of the mixture body block, and metal bolts are used to connect the air horn block and the throttle body block to each other with the mixture body block in between. It is inserted through a metal distance collar whose ends are in contact with both flanges.

(2) Operation The load acting on the carburetor body is received by the metal throttle body block via the bolt and disc collar. Furthermore, since the bolt and distance collar are made of metal, a decrease in fastening force due to a difference in thermal expansion is prevented as much as possible. Moreover, it is no longer necessary to provide a bolt insertion hole in the mixture body block, and therefore, it is possible to avoid external loads from acting on the mixture body block, and the wall thickness of the mixture body block can be made thin and uniform. It can be done.

(3) Embodiment An embodiment of the present invention will be explained below with reference to the drawings. First, in FIGS. 1 and 2, this carburetor is a composite type carburetor, and a choke opener 2
including an automatic choke mechanism 3, a throttle opener 4, a dashbot 5, and a secondary throttle valve opener 6.
, an acceleration pump 7, etc. are attached.

Referring also to FIG. 3, the carburetor body 1 includes a throttle body block 8, a mixture body block 9, and an air horn block 10 stacked in order from the bottom.
It is constructed by integrally connecting each block 8, 9, and 10. Furthermore, the mixture body block 9 and the air horn block 10 are made of synthetic resin, and the throttle body block 8 is made of metal, such as aluminum.

The carburetor body 1 includes a main intake passage 11 and a secondary intake passage 12.
will be installed in parallel. The mixture body blossock 9 forming the middle part of the main intake passage 11 is provided with an outer venturi 13.
An inner venturi 14 is disposed upstream of. Furthermore, a choke valve 15 located upstream of the inner venturi 14 is eccentrically supported on the air horn block 10, and a throttle valve 16 located downstream of the outer venturi 13 is supported eccentrically on the throttle body block 8. be done.

On the other hand, an outer venturi 17 is provided in the mixture valve 9 forming the intermediate portion of the secondary intake passage 12, and an inner venturi 18 is provided upstream of the outer venturi 17. A secondary throttle valve 19 located roughly downstream of the outer venturi 17.
is pivotally supported by the throttle body block 8.

Next, referring to FIG. 4, the structure for integrally connecting the throttle body block 8, mixture body block 9, and air horn block IO will be described in detail. A flange portion 21, 22 extending outwardly is provided,
The throttle body block 8 and the air horn block 10 are also provided with flange portions 23.24 opposite to the respective flange portions 21.22.

Both flanges 21 and 22 of mixture body block 9
In this case, a plurality of insertion holes 25 and 26 having the same axis are formed at a plurality of locations, for example, four locations, spaced apart from each other. Further, the flange portion 23 of the throttle body block 8 is provided with a screw hole 27 corresponding to the insertion hole 25, and the air horn block 10 is provided with an insertion hole 28 corresponding to the insertion hole 26.

The air horn block 10 and the throttle body block 8 are fastened with a plurality of, for example, four, through bolts 29 with the mixture body block 9 sandwiched therebetween. That is, each through bolt 29 is inserted into the insertion hole 28, 26, 25 with the washer 30 interposed between it and the upper surface of the flange portion 24 of the air horn block IO, and is screwed into the screw hole 27 and tightened. Furthermore, the through bolt 29 is surrounded by a distance collar 31 between both flange portions 21 and 22 of the mixture body blossock 9.

The distance collar 31 is made of metal, preferably the same metal as the through bolt 29, and is arranged between the flange parts 21.22 with both ends thereof abutting the opposing surfaces of the flange parts 21.22. It is something that

Next, the operation of this embodiment will be described. An air cleaner (not shown) and the like are connected to the upper part of the carburetor main body 1, that is, on the air horn block 10, and external force from them acts on the carburetor main body 1. However, these external forces hardly act on the mixture body block 9, which is made of synthetic resin, and instead act on the throttle body block 8, which is made of metal.
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That is, the tensile force acting on the air horn block 10 is transmitted to the throttle body block 8 via the through bolt 29, and the compressive force applied to the air horn block 10 is transmitted to the throttle body block 8 via the distance collar 31.

Therefore, it is not necessary to increase the thickness of the mixture body block 9, which requires particular precision, and it is possible to make the mixture body block 9 thin and uniform in thickness.

In addition, since the metal distance collar 31 is interposed between the flange portions 21 and 22, even if there is a difference in thermal expansion between the resin and the metal, a reduction in the fastening force by the through bolts 29 is avoided, and each Blocks 8, 9 and 10 can be reliably integrated.

Further, between the flange blocks 21 and 22, there is no need to provide a hole for inserting the through bolt 29 into the mixture body block 9, and therefore, the waste material of the mixture body block 9 can be reduced. It is possible to make the mixture body block 9 thinner and more uniform, contributing to improved forming accuracy.

Moreover, by making the throttle body block 8 made of metal, it not only functions as a strength member as described above, but also increases the processing accuracy of the throttle body block 8, which requires high precision. Become. In addition, by increasing the thermal conductivity of the throttle body block 8 and suppressing heat radiation with the synthetic resin mixture body block 9, the throttle valve 16.19
It can also contribute to preventing icing around the area.

As another embodiment of the present invention, a stand bolt erected on the slotted body block 8 may be used in place of the through bolt 29, and the same effect can also be achieved by this.

Effects of the C0 Invention As described above, according to the present invention, the throttle body block is formed of metal, and flanges projecting outward are provided at both ends of the mixture body block. The metal bolts that connect the block and throttle body block to each other are inserted through the metal distance collars that have both ends abutted against the flanges, thereby avoiding excessive load on the mixture body block. It becomes possible to reduce the waste of the mixture body cloth, and it becomes possible to improve the molding accuracy by making the mixture body cloth thinner and more uniform.

Further, it is possible to avoid a decrease in bolt fastening force due to the difference in thermal expansion between the synthetic resin and the metal. Furthermore, it is also possible to prevent icing around the throttle valve.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view of the carburetor, FIG. 2 is a view taken in the direction of the ■ arrow in FIG. 1, and FIG. Enlarged sectional view, Figure 4 is IV of Figure 1
- It is an enlarged sectional view taken along the line IV. ■... Carburetor body, 8... Throttle body block, 9... Mixture body block, 10... Air horn block, 21.22... Flange part, 29
...Through bolt, 31...Distance color special
Applicant: Honda Motor Co., Ltd. Figure 4

Claims (1)

[Claims] A carburetor whose main body is constructed by integrally connecting an air horn block, a mixture body block, and a throttle body block in this order, wherein at least the mixture body block is made of synthetic resin, and the throttle body The block is made of metal,
Both ends of the mixture body block are provided with flanges projecting outward, and metal bolts that connect the air horn block and throttle body block to each other with the mixture body block in between are provided with both ends of the metal bolts abutting the flanges. A vaporizer that is inserted through a metal distance collar that is in contact with the vaporizer.