JPS6341554Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sliding throttle valve type carburetor, and more particularly to a sliding throttle valve type carburetor that can greatly reduce the sliding frictional resistance of the sliding throttle valve.

Conventional sliding throttle valve type carburetor (for example,
-Disclosed in Publication No. 25647. ) is explained with reference to FIGS. 1 and 2. Near the fuel port that injects fuel into the intake passage that passes through the carburetor body 1 and communicates with the engine, there is a sliding throttle that controls opening and closing of the intake passage. A valve 4 is disposed, and a flange 100 extending in the sliding direction protrudes from the outer diameter of the sliding throttle valve, and a structure 6 in the sliding direction is formed on the carburetor body corresponding to the flange. It was placed. A linear motion bearing 101 that moves to allow opening and closing of the sliding throttle valve is sandwiched between the flange of the sliding throttle valve and the groove of the carburetor body. In this case, the sliding throttle valve and the carburetor body sandwiched a "moving linear motion bearing" and were brought into contact at two points (X, X) on the outer diameter of the bearing, so the contact friction force was effective. This causes the relative position of the sliding throttle valve to the carburetor body to shift, causing the linear motion bearing to fall off, which is the cause of the high price of the carburetor due to the larger sliding part due to the use of linear motion bearings. It had the following drawbacks. Furthermore, since the side surface of the flange opposite to the surface on which the linear motion bearing is arranged slides directly on the carburetor body, it is not possible to reduce the contact friction force. Furthermore, in this case, the linear motion bearing falls downward and the length of the bearing is long, making the sliding throttle valve large and expensive, and the bearing is installed only on one sliding surface of the sliding throttle valve. There was also a drawback.

The present invention was developed in view of these conventional drawbacks, and its purpose is to significantly reduce the sliding friction force of the sliding throttle valve in a sliding throttle valve carburetor. A sliding throttle valve type carburetor that reduces the throttle operation load, prevents sticking and ensures safe operation, and also ensures the airtightness of the sliding surface of the throttle valve. An object of the present invention is to provide a sliding throttle valve type carburetor that can be used.

According to the present invention, such an object is to integrally fix a radial ball bearing that rolls in the sliding direction to the longitudinal side of the sliding throttle valve, and to fix the radial ball bearing that rolls in the sliding direction to the longitudinal side of the sliding throttle valve, and to attach a radial ball bearing that has a width slightly larger than the outer diameter of the radial ball bearing. A sliding groove 6 is arranged in the carburetor body, and the outer diameter of the radial ball bearing is brought into contact with the sliding groove at one point, and a synthetic resin coating is slid thereon so as to be approximately at the same height as the outer diameter of the radial ball bearing. This is achieved by forming it on the sliding surface of the dynamic throttle valve.

One embodiment of the present invention will be summarized with reference to Fig. 3.
Intake passage 2 that passes through the carburetor body and communicates with the engine
Upstream and downstream of the fuel port 3 from which fuel supplied from the fuel chamber is ejected, there are plate grooves 9 into which two thin plate members (upstream plate 7 and downstream plate 8) are slidably fitted. The diametrical cross-sectional shape of the intermediate intake passage between the two plate grooves is the same as the diametrical cross-sectional shape of the intake passage upstream of the upstream plate 7 and downstream of the downstream plate 8, and is formed in a circular shape. . The upstream plate 7 and the downstream plate 8 may be integral or separate, and are connected outside the intake passage to form the sliding throttle valve 4. The sliding throttle valve is driven vertically by a throttle wire (not shown) and is equipped with a needle 10 inserted into the fuel port 3. Therefore, as a sliding throttle valve, it is possible to ensure the performance of a box or thick plate shape, and when the sliding throttle valve is fully open, there are almost no sliding grooves left in the intake passage, and the two plates of the sliding throttle valve are A predetermined ventilator can be secured within the intermediate intake passage at the lower end of the plate member. On the side of the downstream plate 8, four radial ball bearings 5 that roll in the sliding direction are integrally fixed to the downstream plate, and a sliding groove with a width slightly larger than the outer diameter of the radial ball bearings is formed. It is placed in the carburetor body outside the intake passage.

Proceeding further, one embodiment of the present invention is illustrated in FIGS. 4 to 10.
To explain in detail with the drawings, a fuel port 3 injects fuel supplied from a fuel chamber 12 in which a constant oil level is formed by a float 11 in an intake passage 2 that penetrates the carburetor body 1 and communicates with the engine. Plate grooves 9 are arranged on the upstream and downstream sides, respectively, into which the upstream plate 7 and the downstream plate 8, which are rectangular thin plates, are slidably fitted. The diametrical cross-sectional shape of the intake passage sandwiched and divided by the upstream plate 7 and the downstream plate 8 is the same as that of the upstream plate 7 and the downstream plate 8.
It has the same circular shape as downstream of. The upper end of the downstream plate 8 has a bent portion 13 to the left, and the upper end 14 of the upstream plate 7
The upstream plate and the downstream plate are connected by screws 16 with a spring 15 sandwiched between the upper and the bent portions 13. Since the upstream plate 7 and the downstream plate 8 are connected via the spring 15, which is an elastic body, the machining accuracy of each plate groove 9,
Upstream plate, regardless of parallelism or perpendicularity.
The downstream plates each have a certain degree of freedom.
The status of the sliding throttle valve can be moved downward,
Malfunctions can be prevented. Furthermore, by adjusting the screw 16 when the downstream plate 8 is fully closed, the intake passage opening amount (h dimension) of the upstream plate 7 can be variably controlled, and the magnitude of the intake negative pressure acting on the fuel port 3 can be adjusted. Therefore, it is possible to adjust the mixture ratio mainly at low speeds,
It can eliminate exhaust gas pollution. Upstream plate 7 and downstream plate 8
Since they are connected outside the intake passage, they do not create intake passage resistance and the engine's intake efficiency does not decrease. In addition,
The sliding throttle valve is connected to the throttle shaft 1 via a link 17.
It is operated upward by a lever 19 fixed to 8, and is pressed downward by a spring (not shown).

On the longitudinal sides of the sliding throttle valve 4 outside the intake passage, four radial ball bearings 5 that roll in the sliding direction are integrally fixed to the sliding throttle valve. Sliding groove 6 with a width slightly larger than the dimensions
are arranged on both sides of the carburetor main body 1. Sliding groove 6
Since the width of is larger than the outer diameter of the radial ball bearing by δ, by setting the gap dimension δ, the outer diameter of the radial ball bearing can contact the sliding groove 6 at one point Y. .

The contact surface where the downstream plate 8 of the sliding throttle valve 4 slides with the plate groove 9 of the carburetor body 1 (i.e., both sides or only one side of the engine side surface and the upstream side surface of the downstream plate 8) is coated with a synthetic resin over one surface. 20 is formed with a height of thickness t, and the height is set to be approximately the same as the outer diameter of the radial ball bearing.

The synthetic resin film includes a synthetic resin containing a filler such as tetrafluoroethylene resin (Teflon (registered trademark) resin) or bifluid molybdenum,
The thickness t may be set to be thick at the beginning and be made to have the same height as a radial ball bearing through running-in operation.

A stainless steel rail 21 is embedded in the carburetor body 1 on the rolling surface of the carburetor body where the sliding throttle valve 4 comes into contact with the outer diameter of the radial ball bearing when it slides, increasing sliding durability. This is a huge improvement.

To explain the operation, when the throttle shaft 18 is rotated by a throttle (not shown) and the sliding throttle valve 4 is operated upward to fully open, the diametrical cross-sectional shape of the intake passage in the carburetor is They are continuously circular and the same, and only the plate grooves of the two sliding plates have different cross-sectional shapes. Therefore, the suction efficiency of the engine can be improved compared to conventional box-shaped or plate-shaped sliding throttle valve type carburetors. In addition, a ventilary part is formed in the intermediate intake passage between the two sliding plates by the distance between the two sliding plates, which promotes improved atomization of the fuel jetted from the fuel port 3 and eliminates exhaust gas pollution. do.

In the embodiment, the case where the sliding throttle valve is directly driven by the throttle operation has been explained. The present invention can also be implemented. Further, the sliding throttle valve 4 can be changed to a single plate-shaped member, a cylindrical member, or a box-shaped member.

Since the outer diameter of the radial ball bearing was in contact with the sliding groove 6 at one point Y, the sliding throttle valve was able to roll into contact with the carburetor body, and the sliding frictional resistance could be greatly reduced. . Since the sliding groove 6 with a width slightly larger than the outer diameter of the radial ball bearing is arranged in the carburetor body 1, the radial ball bearing can always roll on the rolling surface of either one of the sliding grooves. Even when a straining, thrust load, or biasing load is applied to the sliding throttle valve, the sliding frictional resistance does not increase, and stable operation of the sliding throttle valve can be ensured.

In addition, a synthetic resin coating is formed on the sliding surface of the sliding throttle valve that slides against the carburetor body, so that the height is approximately the same as the outer diameter of the radial ball bearing, so that the radial ball bearing can be placed against the sliding groove 6. Even if the gap δ is set to make contact at one point at point Y, airtightness can be ensured by preventing the flow of air or mixture from the gap into the intake passage, and the mixture ratio is particularly low during low-speed operation. It can stabilize and eliminate exhaust gas pollution. Furthermore, by forming the synthetic resin film, the machining accuracy of the gap size δ and the surface roughness can be easily controlled, making it possible to provide a sliding throttle valve type carburetor that is easy to produce and inexpensive.

As described above in detail, the present invention has a main body 1 of a vaporizer.
The carburetor body is equipped with an intake passage 2 that passes through the interior and communicates with the engine, and a fuel port 3 that injects fuel into the intake passage, and a sliding throttle valve 4 that controls opening and closing of the intake passage near the fuel opening. In a sliding throttle valve type carburetor disposed so as to be slidable in the sliding throttle valve, a radial ball bearing 5 that rolls in the sliding direction is fixed to the longitudinal side of the sliding throttle valve, and the outer diameter of the radial ball bearing 5 is slightly larger than the outer diameter of the radial ball bearing. A large sliding groove 6 is arranged in the carburetor body, and the outer diameter of the radial ball bearing is brought into contact with the sliding groove at one point, and the synthetic resin is approximately the same height as the outer diameter of the radial ball bearing. Since the coating is formed on the sliding surface of the sliding throttle valve, the radial ball bearing can constantly roll, which can greatly reduce the sliding friction force, reduce the operating load of the throttle, and prevent stuck. This will ensure safe driving.

Furthermore, the sliding throttle valve type carburetor can ensure the airtightness of the sliding surface of the throttle valve, stabilize the mixture ratio during low-speed operation, and eliminate exhaust gas pollution. We have been able to provide a sliding throttle valve type carburetor that can be used.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing the sliding part of a conventional sliding throttle valve type carburetor, Fig. 2 is a sectional view seen from the top of Fig. 1, and Fig. 3 is a sliding throttle valve type according to the present invention. An explanatory view showing one embodiment of the carburetor, FIG. 4 is a vertical cross-sectional view, FIG. 5 is a partial cross-sectional view showing the sliding part, FIG. 6 is a cross-sectional view taken along line A-A in FIG. 5, and FIG. 8 is a front view showing an embodiment of the sliding throttle valve of the present invention, FIG. 8 is a sectional view taken along line B-B in FIG. 7, FIG. 9 is a top view of FIG. 7, and FIG. FIG. 7 is a bottom view of FIG. 7; 1... Carburetor body, 2... Intake path, 3... Fuel port, 4... Sliding throttle valve, 5... Radial ball bearing,
6...Sliding groove.

Claims (1)

[Claims for Utility Model Registration] (1) An intake passage 2 that penetrates the inside of the carburetor body 1 and communicates with the engine, and a fuel port 3 that injects fuel into the intake passage, In a sliding throttle valve type carburetor in which a sliding throttle valve 4 that controls opening and closing of the intake passage is slidably disposed on the carburetor body, a radial ball bearing 5 that rolls in the sliding direction is placed on the longitudinal side of the sliding throttle valve. In addition to being integrally fixed to the
A sliding groove 6 having a width slightly larger than the outer diameter of the radial ball bearing is arranged in the carburetor body, and the outer diameter of the radial ball bearing is brought into contact with the sliding groove at one point,
A sliding throttle valve type carburetor, characterized in that a synthetic resin coating is formed on the sliding surface of the sliding throttle valve so that the height is approximately the same as the outer diameter of the radial ball bearing. (2) The sliding throttle valve type carburetor according to claim 1, wherein the sliding throttle valve is a plate-shaped member. (3) The sliding throttle valve according to claim 1, wherein a stainless steel rail is arranged on the rolling surface of the carburetor body that comes into contact with the outer diameter of the radial ball bearing when the sliding throttle valve slides. type vaporizer. (4) The sliding throttle valve is composed of two plate-like members, and the diametrical cross-sectional shape of the intake passage is sandwiched and divided by the two plate-like members when the sliding throttle valve is fully closed. The sliding throttle valve type carburetor according to claim 1, which has the same diametrical cross-sectional shape of the intake passage downstream of the sliding throttle valve.