JPH04132437U - Idle opening adjustment device for carburetor throttle valve - Google Patents

Abstract

(57) [Summary] [Purpose] Even if a stopper is provided to prevent the throttle valve from being given an excessive idle opening that would cause the engine to run-on, it will interfere with the idle opening adjustment of an engine that has not been run-in. To obtain an idle opening adjustment device that does not have any problems. [Structure] Consists of a male threaded member whose one end abuts a lever that rotates together with the throttle valve, and a cylindrical member that is threadedly engaged with the male threaded member.The male threaded member has a first end that is threadedly engaged with the bracket. The screw and the cylindrical member have a second male thread that is screwed together, and the cylindrical member is screwed into the second male thread until it abuts one end of the first male thread, and the cylindrical member is attached to the bracket. 1st until contact
After the male screw is screwed into the bracket, the first male screw is further screwed into the bracket, the idle opening degree is adjusted, and the cylindrical member is fixed to the second male screw.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention comes into contact with a lever that rotates together with the throttle valve located in the intake passage of the carburetor. and a bracket formed integrally with the casing of the vaporizer or fixed to the casing. This invention relates to an improvement in an idle opening adjustment device for a throttle valve mounted on a vehicle.

0002

[Prior art]

FIG. 6 shows an example of the conventional configuration of the throttle valve idle opening adjustment device having the above configuration. That is, it comes into contact with a lever 3 that rotates together with a throttle valve 2 arranged in the intake passage 1 of the carburetor. A screw member 4a for adjusting the idle opening degree of the throttle valve 2 is fixed to the carburetor casing. The idle opening adjustment device of the throttle valve 2 is configured by screwing the bracket 5 on the screwed part. By screwing the material 4a into the bracket 5, the idle opening of the throttle valve is increased. By unscrewing the same member 4a, the idle opening degree of the throttle valve becomes smaller. 6 is Ko A spring is used to connect the flange 4a-1 formed on the screw member 4a and the bracket 5. After the idle opening of the throttle valve 2 is adjusted, the This prevents the screw member 4a from rotating in the direction of decreasing the idle opening of the throttle valve. 4a-2 prevents the screw member 4a from being screwed in excessively and causing a run-on. This is a stepped portion of the screw member 4a that forms a stopper.

0003 Therefore, the relative angle between the throttle valve 2 and the lever 3, the shape of the bracket 5, and the screw member 4a Since there are variations in the dimensions and other dimensions of the If the structure is such that the attached part 4a-2 is formed, it may not be sufficiently broken in immediately after assembly. In a small engine, tighten the screw member 4a until the stepped part 4a-2 touches the bracket 5. Even if it is inserted, throttle valve 2 may not be able to open to an opening that allows idling operation. There is a problem that occurs.

0004 For example, in Fig. 7, the idle opening range of an engine without break-in is a , the idle opening range of the engine with break-in is b, and the screw member 4a is the stepped part. Variations in the opening degree of throttle valve 2 when tightened until 4a-2 hits bracket 5 If the width is c and the run-on region is the opening degree d or more of the throttle valve 2, the variation width c is large. from the stepped portion 4a-2 to the tip of the screw member 4a to prevent run-on. When the length is determined, the variation range of the opening degree of the throttle valve 2 becomes c1, and the break-in time becomes c1. It becomes impossible to adjust the idle of an engine that has not been broken in, and the engine that has not been broken in If the above length is determined so that the idle adjustment can be made without fail even when the throttle valve 2 is open, Since there is a risk of run-on occurring due to the fluctuation range being c2, two-step adjustment is possible. An idle opening adjustment device is required.

[0005] As an idle opening adjustment device that can be adjusted in two stages, it is screwed into a fixed member so that it can move forward and backward. a first screw member that seals to prevent further adjustment after adjustment; A diaphragm consisting of a second screw member that performs fine adjustment in addition to the adjustment made by the screw member. A valve idle opening adjustment device is disclosed in Japanese Utility Model Application No. 56-101434. figure 8 and 9 show two of the embodiments listed in Utility Model Application No. 56-101434. 1 is the intake passage of the carburetor, 2 is the throttle valve, and 3 is the lever that rotates together with the throttle valve 2. - is the same as in the case of FIG. 4c indicates the second screw member.

[0006] Figure 10 shows the idle opening of the sliding valve type carburetor disclosed in Utility Model Application No. 56-118945. A male screw member 4d is arranged through a cylindrical adjustment screw member 7a. ing.

[0007] Therefore, the configuration disclosed in Utility Model Application No. 56-101434 allows the engine to break in. Even if the user's adjustment range can be limited to some extent, the user may still be able to adjust the throttle valve 2. Idle opening is greater than the idle opening adjusted by the engine manufacturer Leaving the possibility that run-on may occur due to adjustment, disclosed in Utility Model Application No. 56-118945 In this structure, a cylindrical adjusting screw member 7a is adjusted by the engine manufacturer and a lock nut is installed. Even if it is fixed by a set and prevents the user from adjusting the idle opening too low, Run-on due to excessive adjustment of idle opening cannot be prevented.

[0008]

[Problem that the idea aims to solve]

Limit the idle opening of the throttle valve to an opening that does not cause engine run-on. The engine is equipped with a stopper that allows the engine to run into the engine. The carburetor throttle prevents the idle opening adjustment from becoming impossible even when the It is an object of the present invention to obtain an idle opening adjustment device for a valve.

[0009]

[Means to solve the problem]

It comes into contact with a lever that rotates together with the throttle valve located in the intake passage of the carburetor, and the above-mentioned It is formed integrally with the casing of the vaporizer or is attached to a bracket fixed to said casing. An idle opening adjustment device for a throttle valve, which is attached to the bracket and is screwed to the bracket. a male threaded member with one end abutting the lever; and a male threaded member with one end abutting the lever; Forms a stopper that comes into contact with the racket to prevent excessive tightening of the male threaded member. a cylindrical member, and the externally threaded member has a first member screwed onto the bracket. a male thread, and one end of the male thread member that abuts the lever with respect to the first male thread; is on the opposite side, with a diameter smaller than the first male thread and equal to the pitch of the first male thread. A second male thread having a pitch and threadedly engaged with the cylindrical member is formed, and has an outer diameter larger than the outer diameter of the first male threaded member, and has the second male threaded member on the inner peripheral surface. A side is formed with a female thread to be screwed into the bracket, and comes into contact with the bracket to form a stopper. A flange is formed at or close to the end opposite to the one end of the cylindrical member. The cylindrical member is screwed onto the male threaded member until the cylindrical member contacts the end of the first male thread. and a coil spring along the outer periphery of the cylindrical member from the one end side of the cylindrical member. insert the bracket until the one end of the tubular member abuts the bracket. After once screwing the first male screw into the bracket, further screw the first male screw into the bracket. If the engine is screwed into the engine and has not been broken in, it will not become a run-on region. After adjusting the idle opening degree, the cylindrical member is fixed to the male thread member. Therefore, the one end of the cylindrical member will be used when adjusting the idle opening of the throttle valve. Forms a stopper that prevents run-on from occurring due to excessive tightening of the male thread member, The coil spring moves the male threaded member in the throttle valve closing direction via the cylindrical member. The structure is such that it prevents rotation.

0010

[Effect]

The cylindrical member is screwed onto the second male thread of the male threaded member, and one end of the cylindrical member is connected to the first male thread. Screw the first male screw into the bracket while making contact with the end of the screw, and then The position where one end of the cylindrical member that is in contact with the end of the screw is in contact with the bracket is As a reference, further adjust the idle opening of the throttle valve by tightening the male threaded member. Easy to adjust.

[0011] Since the pitch of the first male thread and the second male thread are equal, one end of the cylindrical member is brushed. While maintaining contact with the bracket, screw the male threaded member into the bracket and attach the throttle valve. The idle opening degree can be adjusted.

0012 Once you have adjusted the idle opening of the throttle valve, readjusting it will help the engine get used to it. Along with this, adjustment is made to reduce the opening degree of the throttle valve, and There is no need to tighten the second male screw and the cylindrical member into the cylindrical member. It may be fixed by tightening or adhesive, and by fixing, subsequent Prevents run-on from occurring due to accidentally over-tightening the male thread during adjustment. can do.

[0013]

【Example】

Each figure from Fig. 1 to Fig. 4 shows the idle opening adjustment device of the carburetor throttle valve of the present invention. The process of assembling the constituent parts is shown. Figure 5 shows a throttle valve eye using a male threaded member. This shows the state after the door opening adjustment is completed.

[0014] In each figure, code 1 is the intake passage of the carburetor, 2 is the throttle valve, and 3 is integrated with the throttle valve 2. The rotating lever, 5 is a bracket, and 6 is a coil spring is shown in Figure 6. 4 is screwed onto the bracket 5, and one end 4-1 is connected to the lever 3. The abutting male threaded member 7 has one end 7-1 abutting the bracket 5 and the male threaded member 4 It is a cylindrical member that forms a stopper that prevents excessive tightening.

[0015] The male thread member 4 has a first male screw 4-2 that is screwed into the screw hole 5-1 of the bracket 5. and the end 4-1 of the male threaded member 4 that comes into contact with the lever 3 with respect to the male thread 4-2. On the opposite side, the first male screw 4-2 has a smaller diameter than the first male screw 4-2 and a pitch of the first male screw 4-2. A second male thread 4-3 is formed which has a pitch equal to that and which is threadedly engaged with the cylindrical member 7. There is. The outer diameter of the cylindrical member 7 is larger than the outer diameter of the first male thread 4-2 of the male threaded member 4. A female thread 7-2 is formed on the inner peripheral surface to be screwed into the second male thread 4-3 of the threaded member 4. and a flange 7-3 is formed at the end opposite to the one end 7-1 or close to the end. has been done. Insert the male threaded member 4 into the cylindrical member 7 in the direction shown by the arrow in FIG. The second male thread 4-3 of the same member 4 is screwed into the female thread 7-2 of the cylindrical member 7, and the cylindrical part One end 7-1 of the material 7 is brought into contact with the end 4-4 of the first male thread 4-2 of the male threaded member 4. 2, and then the end 4 of the male threaded member 4 opposite to the one end 4-1. Press-fit knob 8 into -5. However, for the knob 8, use a screwdriver to tighten the male thread member 4. It is used to rotate without any movement, and is not intended to limit the configuration of the present invention. stomach.

[0016] Next, after inserting the coil spring 6 into the cylindrical member 7, move it in the direction shown by the arrow in FIG. Screw the first male screw 4-2 of the screw member 4 into the screw hole 5-1 of the bracket 5, The one end 7-1 of the cylindrical member 7 is brought into contact with the bracket 5 to form the state shown in FIG. Before As mentioned above, the relationship angle between the throttle valve 2 and the lever 3, the shape of the bracket 5, and the male thread member 4 Depending on the dimensions and other variations, the aperture caused by the contact between the lever 3 and the male threaded member 4 The opening degree of valve 2 is based on the idea for a new engine without break-in shown in Figure 7. It may be within the dollar opening range a or it may be less than that.

[0017] However, the one end 7-1 of the cylindrical member 7 is kept in contact with the bracket 5 and the opening range a The dimensions of the male threaded member 4 are adjusted so that the idle opening degree of the throttle valve 2 can be adjusted to approximately the center value of As shown in Figure 5, after adjusting the idle opening, the end of the male thread 4-4 and the one end of the cylindrical member 7 are separated. In this state, the female thread of the cylindrical member 7 7-2 and the second male thread 4-3 of the male thread member 4 are fixed with adhesive, or a cylindrical The member 7 is crimped and fixed from the outer circumferential side. Even if it is fixed, the engine will break in. Accordingly, the direction in which the male threaded member 4 is unscrewed, that is, the one end 7-1 of the cylindrical member 7 is It is possible to readjust in the direction away from the racket 5, and the above-mentioned part of the cylindrical member 7 The end 7-1 acts as a stopper, and the idle opening of the throttle valve 2 is lower than the initial adjusted opening. Since it does not become large, there is no risk of run-on occurring. coil spring 6 is disposed between the flange 7-3 of the cylindrical member 7 and the bracket 5, and the male threaded member 4 The rotation of the throttle valve 2 in the closing direction is prevented via the cylindrical member 7.

[0018]

[Effect of the idea]

The idle opening adjustment device of the carburetor throttle valve of the present invention has the following effects. For tightening a male threaded member from the position where one end of the cylindrical member touches the bracket. Therefore, when the engine has not yet been broken in after engine assembly, the throttle valve The idle opening degree can be easily adjusted. After the adjustment is completed immediately after engine assembly, the cylindrical member and the male threaded member are fixed, and the cylindrical member is fixed. Since one end of the shaped member contacts the bracket and forms a stopper, the subsequent idle When readjusting the opening, run-on may occur due to over-tightening of the male thread. There is no. The cylindrical member 7 is screwed in place of the conventionally used screw member (Fig. 6, reference numeral 4a). By attaching the male screw member 4 (each figure from FIG. 1 to FIG. 5) to the bracket 5, It can be easily implemented.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a process of screwing a threaded member into a cylindrical member.

FIG. 2 is a diagram showing the process of press-fitting a knob into a male threaded member.

FIG. 3 is a diagram showing a process of inserting a coil spring into a cylindrical member and screwing a male threaded member to a bracket.

FIG. 4 is a diagram showing a state in which the male thread member has been completely screwed into the bracket.

FIG. 5 is a diagram showing a state after adjusting the throttle valve idle opening.

FIG. 6 is a diagram showing a conventional configuration of an idle opening adjustment device for a carburetor throttle valve.

FIG. 7 is a diagram illustrating problems when using the carburetor throttle valve idle opening adjustment device of FIG. 6;

FIG. 8 is a diagram showing a conventional configuration example of an idle opening adjustment device for a carburetor throttle valve using two screw members.

FIG. 9 is a diagram showing another conventional configuration example of an idle opening adjustment device for a carburetor throttle valve using two screw members.

FIG. 10 is a diagram showing a configuration example of an idle opening adjustment device for a throttle valve of a sliding valve type carburetor using a cylindrical adjustment screw member and a male thread member.

[Explanation of symbols]

1 Intake passage of the carburetor 2 Throttle valve 3 Lever that rotates together with the throttle valve 4 Male thread member 4-2 First male screw 4-3 Second male screw 5 Bracket 6 Coil spring 7 Cylindrical member 8 Picking 9 Vaporizer housing

Claims (1)

[Scope of utility model registration request] [Claim 1] A lever (3) that comes into contact with a lever (3) that rotates together with a throttle valve (2) disposed in an intake passage (1) of the carburetor, and is formed integrally with the casing (9) of the carburetor. or an idle opening adjustment device for a throttle valve attached to a bracket (5) fixed to the housing (9), the device being screwed onto the bracket (5) and having one end abutting the lever (3). A male threaded member (4) in contact with the male threaded member (4) and one end (7-1) of the male threaded member (4) that is screwed together abuts the bracket (5) to prevent excessive tightening of the male threaded member (4). a cylindrical member (7) that forms a stopper, and the male threaded member (4) has a first male thread (4-2) that is screwed into the bracket (5); (4-2), one end (4) of the male threaded member (4) that comes into contact with the lever (3)
-1), the cylindrical member (7) has a smaller diameter than the first male thread (4-2) and a pitch equal to the pitch of the first male thread (4-2); A second male thread (4-3) is formed which is screwed into the cylindrical member (7), and the outer diameter of the cylindrical member (7) is larger than the outer diameter of the first male thread (4-2). has a female screw (7) that is screwed together with the second male screw (4-3).
-2) is formed, and a flange (7-3) is formed at or close to the end opposite to the side that contacts the bracket (5) to form a stopper, and The one end (7-1) of the cylindrical member (7) is connected to the first male screw (4-
The cylindrical member (7) is screwed into the male threaded member (4) until it abuts the end (4-4) of the cylindrical member (7), and the one end (7-1) of the cylindrical member (7) The cylindrical member (7) from the side
A coil spring (6) is inserted along the outer periphery of the bracket (5) until the one end (7-1) of the cylindrical member (7) comes into contact with the bracket (5). After screwing the screw (4) once, screw the first male screw (4-2) into the bracket (5) to adjust the idle opening so that it does not fall into the run-on region of an engine that does not have break-in. After that, by fixing the cylindrical member (7) to the male threaded member (4), the one end (7-1) of the cylindrical member (7) is used for adjusting the idle opening of the throttle valve. A stopper is formed to prevent run-on from occurring due to excessive tightening of the male thread member (4) when the coil spring (6) is tightened via the cylindrical member (7). ) An idle opening adjustment device for a carburetor throttle valve, characterized in that it prevents the throttle valve from rotating in the closing direction.