JPH0452462Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field This invention is based on a system in which a cam lever integrally equipped with a cam for determining the first idle opening of the throttle valve is rotatably attached to the carburetor body. The cam lever is pivotably supported and is biased by a spring in a direction to bring it into contact with a drive shaft of a temperature-sensitive actuating means that responds to changes in ambient temperature, and has a driven gear that meshes with a sector gear that is interlocked with the cam lever, and a check valve. The present invention relates to an automatic check valve device for a carburetor in which a torsion spring is interposed between a check valve shaft rotatably supported by a carburetor body.

(2) Conventional technology Conventionally, such a device has been developed, for example, by
It is known from Publication No. 40932.

(3) Problems to be solved by the invention However, in the above-mentioned conventional device, the sector gear is integrally provided with the cam lever, and the chiyoke valve and the driven gear are connected via a torsion spring, so that the cam lever rotates. Accordingly, the driven gear is rotated via the sector gear, and the chiyoke valve is further rotated via the torsion spring. For this reason, no initial torque is acting on the torsion spring between the cheese yoke valve shaft and the driven gear, so that the yoke valve opening becomes unstable and it is difficult to set the yoke to obtain proper yoke characteristics. Further, when the temperature sensing actuating means causes an overstroke of more than the full opening of the chiyoke valve, an undesirable force acts on the torsion spring in the direction of releasing the torsion state.

The present invention has been developed in view of the above circumstances, and is a carburetor that stabilizes the opening degree of the choke valve and prevents the overstroke of the temperature-sensitive actuating means from acting on the driven gear. The purpose of the present invention is to provide an automatic chiyoke device.

B. Structure of the invention (1) Means for solving the problems According to the invention, the support shaft fixed to the carburetor body has a cam lever and a shaft that extends along the rotation direction of the valve opening around the support shaft. A gear lever that can abut the cam lever from the rear side and has an integral sector gear is supported for relative rotation, and a spring force is applied between the cam lever and the carburetor body in the direction of bringing the cam lever into abutment with the temperature-sensitive actuation means. A first spring is interposed between the cam lever and the gear lever, and a second spring is interposed between the cam lever and the gear lever to exert a spring force in the direction of bringing them into contact with each other.
A spring is interposed, and a driven gear is fitted into the shaft of the York valve so as to be relatively rotatable, and the driven gear is able to come into contact with the driven gear from the front side along the rotational direction of the valve opening around the shaft of the York valve. A contact plate is fixedly installed, and a torsion spring is interposed between the driven gear and the contact plate to exert a spring force in a direction to bring them into contact.

(2) Effect According to the above configuration, the torsion spring is given an initial torque in a state where the driven gear and the contact plate are brought into contact with each other, so that the opening degree of the choke valve is stabilized. Further, when the temperature-sensitive actuating means overstrokes, only the cam lever rotates, and no force due to the overstroke is applied to the driven gear.

(3) Embodiment Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. First, in FIG.
is equipped with an automatic rotation device 5 for automatically determining the rotational position of a rotation valve shaft 4 rotatably supported on the carburetor main body 2 in accordance with the ambient temperature.

Referring to FIGS. 2 and 3 together, the automatic rotation device 5 includes a temperature-sensitive actuating means 6, a cam lever 7 rotatably driven by the temperature-sensing actuating means 6, and a gear lever 8 interlocked with the cam lever 7. a first spring 9 interposed between the carburetor main body 2 and the cam lever 7; a second spring 10 interposed between the cam lever 7 and the gear lever 8; and a driven gear 11 interlocked and connected to the gear lever 8. , an abutment plate 12 fixed to the York valve shaft 4, and a torsion spring 13 interposed between the driven gear 11 and the abutment plate 12.
Further, a chiyoke valve 14 is eccentrically fixed to the chiyoke valve shaft 4.

The temperature-sensitive actuating means 6 is configured to cause the drive shaft 15 to protrude and retreat by expanding and contracting silicone oil or the like contained therein in response to rises and falls in ambient temperature, and is a conventionally known method. It is. This temperature-sensitive operating means 6 is attached to the carburetor body 2 with the tip of the drive shaft 15 facing downward.

Below the temperature-sensitive actuation means 6, the vaporizer body 2 includes:
A support shaft 16 is provided in a protruding manner, and the cam lever 7 and the gear lever 8 are supported by the support shaft 16 so as to be relatively rotatable. That is, the first cylindrical body 18 is rotatably supported on the tip side of the support shaft 16 with a retaining ring 17 fitted in the middle part of the support shaft 16 as a boundary, and the first cylindrical body 18 is rotatably supported between the retaining ring 17 and the carburetor main body 2. The second
A cylindrical body 19 is rotatably supported. The cam lever 7 is fixed to the first cylindrical body 18, and the second cylindrical body 1
A gear lever 8 is fixed to 9.

The cam lever 7 includes a cam 20 for determining the first idle opening degree of the throttle valve (not shown).
are provided integrally. That is, a lever 23 having a cam follower 22 is connected to a throttle valve shaft 21 to which the throttle valve is fixed and rotatably supported by the carburetor body 2.
A cam 20 is integrally provided with the cam lever 7 so as to come into contact with the cam lever 7 to determine the first idle opening degree of the throttle valve. Further, the throttle valve shaft 21 is connected to a conventionally known dart pot device 24.

The cam lever 7 is integrally provided with a contact arm 25 that extends below the drive shaft 15 in the temperature-sensitive actuation means 6, and the end of the contact arm 25 contacts the end of the drive shaft 15. A screw member 26 is screwed together so that it can move forward and backward. Further, the first spring 9 is a torsion spring that surrounds the second cylindrical body 19 and is interposed between the cam lever 7 and the carburetor main body 2, and
6 urges the cam lever 7 in the direction in which it comes into contact with the drive shaft 15.

The gear lever 8 is integrally provided with a sector gear 27 that meshes with the driven gear 11. Moreover, this gear lever 8 is integrally provided with an arm portion 28 that extends in the axial direction of the support shaft 16, and the cam lever 7 has an arm portion 28 that extends in the axial direction of the support shaft 16. Opposing contact portions 30 are integrally provided. Furthermore, a screw member 31 that can come into contact with the abutment part 30 is screwed into the arm part 28 so as to be able to move forward and backward.
It is possible to come into contact with. Further, the second spring 10 is a torsion spring that surrounds the first cylindrical body 18 and is interposed between the cam lever 7 and the gear lever 8. The second spring 10 is a torsion spring that is interposed between the cam lever 7 and the gear lever 8, and allows both levers 7 and 8 to be mutually moved with a set load smaller than that of the first spring 9. exerts a spring force in the direction of bringing it into contact with.

A driven gear 11 that meshes with a sector gear 27 is provided on the valve shaft 4 at a portion protruding from the carburetor main body 2.
are fitted and inserted so as to be relatively rotatable. Further, a contact plate 12 is fixed to the outer end of the chiyoke valve shaft 4.
The driven gear 11 and the contact plate 12 are integrally provided with opposing contact portions 32 and 33 that face and contact each other. Moreover, the opposing contact portion 3 provided on the contact plate 12
3 is arranged to abut against the opposing contact portion 32 of the driven gear 11 from the front side along the rotation direction 34 of the valve opening around the valve shaft 4 .

Further, the torsion spring 13 is interposed between the driven gear 11 and the contact plate 12, and the set load is set to be relatively small, and the spring force is applied in the direction of bringing the opposing contact parts 32 and 33 into contact with each other. demonstrate.

Further, the chiyoke valve shaft 4 includes a chiyoke valve 14.
an operating lever 3 that can come into contact with the contact plate 12 when the valve is closed;
5 is mounted so as to be relatively rotatable, and this actuating lever 35 is equipped with a conventionally known complete explosion actuator 3.
6 are connected.

Next, the operation of this embodiment will be explained. As the temperature-sensitive actuating means 6 operates in a protruding manner in accordance with the rise in ambient temperature, the cam lever 7 resists the spring force of the first spring 9 and rotates to open the check valve. It is pressed and rotated by the drive shaft 15 in the direction 29 . On this occasion,
The gear lever 8 is biased to rotate by the second spring 10, and since the screw member 31 screwed into the arm portion 28 is in contact with the contact portion 30, the gear lever 8 rotates as the cam lever 7 rotates, and the sector gear is rotated. Driven gear 1 by 27
1 rotates in the direction 34 of rotation for opening the valve. Moreover, since the opposing abutting portion 33 of the abutting plate 12 is brought into contact with the opposing abutting portion 32 of the driven gear 11 by the torsion spring 13, the abutting plate 12, that is, the chiyoke valve shaft 4 is rotated by the driven gear 11. The valve 14 is rotated in accordance with the ambient temperature, and the check valve 14 is driven to open to an opening degree corresponding to the ambient temperature.

When the check valve 14 is opened, the driven gear 11
The torsion spring 13 interposed between the abutting plates 12 is given an initial torque sufficient to bring the opposed abutting parts 32 and 33 into contact with each other, so that the opening degree of the yoke valve 14 is controlled by the torsion spring. It is held stably by the initial torque of 13.

Also, when the chiyoke valve 14 is fully opened, the temperature sensing actuating means 6
Assume that an overstroke occurs.
At this time, the chiyoke valve 14 is in contact with an intake passage (not shown) provided in the carburetor main body 2 and is prevented from further rotation, and is therefore in mesh with the driven gear 11 and its driven gear 11. Sector gear 27 is also prevented from rotating further. When an overstroke occurs in the temperature-sensitive actuating means 6 in such a state, the cam lever 7 is moved by the first and second springs 9,
Rotating direction 2 of the valve opening against the spring force of 10
9, the screw member 31 screwed into the arm portion 28 of the gear lever 8 separates from the contact portion 30. Therefore, even if an overstroke occurs in the temperature-sensitive actuating means 6 when the chiyoke valve 14 is fully opened, the gear lever 8 will not be rotated further and the torsion spring 13
No excessive force is applied to the

C. Effects of the invention As described above, according to the invention, the support shaft fixed to the carburetor body has a cam lever, and the cam lever comes into contact with the cam lever from the rear side along the rotational direction of the valve opening around the support shaft. A gear lever having a sector gear integral therewith is supported for relative rotation, and a first spring is interposed between the cam lever and the carburetor body to exert a spring force in a direction to bring the cam lever into contact with the temperature-sensitive actuation means. A second spring is interposed between the cam lever and the gear lever to exert a spring force in a direction that brings them into contact with each other. , a contact plate that can come into contact with the driven gear from the front side along the rotation direction of the check valve opening around the check valve shaft is fixedly installed, and a spring is installed between the driven gear and the contact plate in a direction that brings them into contact. Since a torsion spring that exerts force is installed, it is possible to stabilize the opening of the choke valve by applying initial torque to the torsion spring, and also to control the gear lever when overstroke of the temperature-sensitive actuating means occurs. It is possible to avoid applying excessive force to the torsion spring by keeping it stopped.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an overall side view of a carburetor, FIG. 2 is a sectional view taken along the line -- in FIG. be. DESCRIPTION OF SYMBOLS 1... Carburetor, 2... Carburizer main body, 4... Chiyoke valve shaft, 5... Automatic chiyoke device, 6... Temperature sensitive actuation means, 7... Cam lever, 8... Gear lever, 9... First Spring, 10...Second spring, 11...
... Driven gear, 12 ... Contact plate, 13 ... Torsion spring, 14 ... Chyoke valve, 16 ... Support shaft, 20 ...
...Cam, 27...Sector gear, 29...Rotational direction of opening the check valve around the support shaft, 34...Turning direction of opening the check valve around the check valve shaft.

Claims (1)

[Scope of utility model registration request] A cam lever integrally having a cam for determining the first idle opening degree of the throttle valve is rotatably supported on the carburetor body, and is brought into contact with the drive shaft of the temperature-sensitive actuation means that responds to changes in ambient temperature. The cam lever is biased by a spring, and a torsion spring is interposed between a driven gear meshing with a sector gear interlocking with the cam lever and a chiyoke valve shaft having a chiyoke valve and rotatably supported on the carburetor body. In an automatic check valve device for a carburetor, a support shaft fixed to the carburetor body has a cam lever and a support shaft that can come into contact with the cam lever from the rear side along the direction of rotation of the check valve opening around the support shaft. A gear lever integrally having a sector gear is supported for relative rotation, and a first spring is interposed between the cam lever and the carburetor body to exert a spring force in a direction to bring the cam lever into contact with the temperature-sensitive actuation means; A second spring is interposed between the cam lever and the gear lever to exert a spring force in a direction that brings them into contact with each other, and a driven gear is fitted into the cam lever and the gear lever so as to be relatively rotatable. A contact plate is fixedly installed that can come into contact with the driven gear from the front side along the direction of the valve opening rotation around the shaft, and a spring force is exerted between the driven gear and the contact plate in the direction of bringing them into contact. An automatic control device for a carburetor, characterized in that a torsion spring is inserted.