CN106168170A - Governor arrangement - Google Patents

Abstract

To provide a governor device that suppresses resonance of a governor spring with a simple structure. The governor device (100) has: a throttle control lever (41), which opens and closes the throttle valve, and the throttle valve adjusts the air intake of the engine (1); a governor control lever (110), which It is connected to the throttle control lever via the governor lever (120), and the throttle control lever (41) is moved toward the throttle valve in accordance with the increase of the centrifugal force acting on the governor weight installed on the crankshaft (11). Direction drive; and the governor spring (140), which pre-tightens the governor joystick to the direction of closing the throttle valve, the governor device (100) has a structure that the governor spring is a tension coil spring, the One end of the tension coil spring is connected to a speed controller (130) for adjusting the operating speed of the engine, and the other end is connected to a locked portion (123) formed in the middle portion of the governor lever.

Description

Governor device

technical field

The present invention relates to a governor device installed in a general-purpose engine, and particularly relates to a governor device capable of suppressing resonance of a governor spring with a simple structure.

Background technique

In a general-purpose engine that drives a plant such as a construction machine, a speed regulating mechanism that autonomously adjusts the engine speed, that is, a governor device, is provided.

The governor device utilizes the centrifugal force acting on the governor weight attached to the crankshaft of the engine to preload the throttle valve in the closing direction according to the increase in engine speed.

In the governor device, it is set: a governor rod, which transmits the action of the governor joystick linked with the governor weight to the throttle valve; and a governor spring, which is hooked on the speed controller and the governor Between the control levers, pre-tighten the governor control lever to the throttle valve opening side.

The governor device keeps the throttle valve at a position where the engine speed is balanced by the centrifugal force of the governor weight and the pretightening force of the speed regulating spring, so as to regulate the speed of the engine.

For example, in the case of a construction machine such as a tamping machine, where the vibration of the mounted machine is large, the speed regulating spring of the speed governor device resonates, so the rotation of the engine becomes unstable, and the speed regulating spring may be damaged and the speed controller may be damaged. The connection part with the governor spring is damaged, etc.

As a prior art related to the above-mentioned governor device, for example, Patent Document 1 describes that a buffer spring is bridged between the throttle valve and the governor lever, and the spring constant of the buffer spring is set to is less than or equal to the spring constant of the governor spring.

Patent Document 2 describes that a rod-shaped damper is embedded in a coil in order to prevent rotation fluctuation of an engine due to vibration of a governor spring.

In Patent Document 3, it is described that, in order to prevent the vibration of the speed regulating spring, a linear portion is provided at the central portion of the speed regulating spring in the longitudinal direction, and the support portion of the elastic damper is supported by the linear portion. support.

Patent Document 4 describes that in order to suppress the vibration acting on the governor lever and obtain stable engine rotation, a balance weight is fixedly provided at the base of the governor lever, and the balance weight offset the rotational torque.

Patent Document 1: Japanese Publication No. 59-52147

Patent Document 2: Japanese Patent Application Laid-Open No. 11-101135

Patent Document 3: Japanese Patent Application Publication No. 2-91231

Patent Document 4: Japanese Patent Laid-Open No. 2004-278480

In each of the above-mentioned conventional technologies, additional parts such as anti-vibration materials and counterweights are required for anti-vibration, which increases the number of parts, complicates the manufacturing process, and increases the weight and cost of the governor device.

Contents of the invention

In view of the above problems, an object of the present invention is to provide a governor device that suppresses resonance of a governor spring with a simple structure.

The present invention solves the above-mentioned problems by the following solution means.

The invention according to claim 1 is a governor device, which includes: a throttle valve lever that opens and closes a throttle valve that adjusts the air intake amount of the engine; a governor lever that The throttle control lever is connected to the throttle control lever via a speed control lever, and the throttle control lever is driven in a direction to close the throttle valve according to the increase of the centrifugal force acting on the governor weight attached to the crankshaft; And a governor spring, which pre-tensions the governor operating rod in the direction of closing the throttle valve. The governor device is characterized in that the governor spring is an extension coil spring, and the extension coil One end of the spring is connected to a speed controller for adjusting the operating speed of the engine, and the other end is connected to a locked portion formed at a middle portion of the governor lever.

According to this, in the usual structure in which the end of the speed regulating spring is connected to the speed regulating lever, the length of the speed regulating spring can be shortened, and the resonant frequency (natural frequency) of the speed regulating spring can be increased, making it compatible with The frequency of vibration is separated, and the amplitude is also reduced to suppress resonance.

This prevents engine speed from becoming unstable, damage to the governor spring, or damage to peripheral components, without increasing the number of parts and weight as in conventional techniques such as adding anti-vibration materials and counterweights. Improves engine durability.

In addition, since the axial position of the connecting portion of the speed regulating spring on the speed regulating rod has a high degree of freedom in setting the axial position, the tuning of the resonance frequency of the speed regulating spring is easy. Even when the frequency is different, it can be handled by a simple design change.

Furthermore, it can be easily applied to an existing engine only by changing the design of the governor lever and the governor spring.

The invention according to claim 2 is the governor device according to claim 1, wherein the engaged portion is formed by bending the middle portion of the governor lever into a crank shape.

According to this, the locked portion can be formed with a simple structure without increasing the number of components.

The invention according to claim 3 is the governor device according to claim 1 or 2, wherein one end of the governor spring is locked to the bend of the governor lever and formed into a crank shape. the convex end of the speed regulating spring, and the fixing piece is locked on the speed regulating lever, and the fixing piece prevents one end of the speed regulating spring from falling off from the convex end.

Accordingly, it is possible to prevent the governor spring from coming off the governor lever, thereby improving reliability.

The effect of the invention

As described above, according to the present invention, it is possible to provide a governor device that suppresses resonance of the governor spring with a simple structure.

Description of drawings

Fig. 1 is an external perspective view of an engine having Embodiment 1 to which a governor device of the present invention is applied.

Fig. 2 is a top plan view of a state in which an air cleaner, a fuel tank, and the like are removed from the engine of Fig. 1 .

Fig. 3 is a view of the engine of Fig. 1 viewed from the horizontal direction.

4 is a perspective view of a state in which an air cleaner, a muffler, a fuel tank, and the like are removed from the engine in FIG. 1 , viewed from an obliquely upper side on the cylinder head side.

5 is a perspective view of a state in which an air cleaner, a muffler, a fuel tank, and the like are removed from the engine in FIG. 1 , as viewed obliquely above the crankcase side.

Fig. 6 is a top view of a state in which an air cleaner, a fuel tank, and the like are removed from an engine having a governor device as a comparative example of the present invention, viewed from the upper surface.

Fig. 7 is a diagram of a connecting portion between a governor lever and a governor spring of Example 2 to which the governor device of the present invention is applied, viewed from above.

Explanation of labels

1 engine 10 crankcase

11 Crankshaft 20 Cylinder

30 Cylinder head 40 Carburetor

41 Throttle lever 50 Air filter

60 Muffler 70 Fuel tank

80 blower

100 Governor Unit 110 Governor Joystick

111 Rotary axis 120 Speed lever

121, 122 Ends 123 Speed regulating spring connection part

124 Washer 130 Speed controller

140 Governor spring 141, 142 ends

150 Fixing piece 151 Groove

152 Ears

detailed description

The present invention solves the problem of providing a governor device that suppresses the resonance of the governor spring with a simple structure by connecting one end of the governor lever side of the governor spring to the The locking part formed in the middle part of the governor joystick is connected, and the governor spring is shortened to increase the resonance frequency, which is shifted from the frequency of the vibration generated during engine operation.

【Example 1】

Next, Embodiment 1 to which the speed governor device of the present invention is applied will be described.

The governor device of Embodiment 1 is an automatic speed regulating mechanism provided in a general-purpose engine that is incorporated into a plant such as a construction machine to generate driving force.

FIG. 1 is an external perspective view of an engine having a governor device according to Embodiment 1. FIG.

Fig. 2 is a top plan view of a state in which an air cleaner, a fuel tank, and the like are removed from the engine of Fig. 1 .

Fig. 3 is a view of the engine of Fig. 1 viewed from the horizontal direction (the blower side in the direction of the crankshaft axis).

4 is a perspective view of a state in which an air cleaner, a muffler, a fuel tank, and the like are removed from the engine in FIG. 1 , viewed from an obliquely upper side on the cylinder head side.

5 is a perspective view of a state in which an air cleaner, a muffler, a fuel tank, and the like are removed from the engine in FIG. 1 , as viewed obliquely above the crankcase side.

The engine 1 is, for example, a forced gas-cooled 4-stroke single-cylinder OHC gasoline engine.

The engine 1 includes a crankcase 10, a cylinder 20, a cylinder head 30, a carburetor 40, an air cleaner 50, a muffler 60, a fuel tank 70, a blower 80, a governor device 100, and the like.

The crankcase 10 is a container-shaped portion that rotatably supports and accommodates a crankshaft 11 that is an output shaft of the engine 1 .

Both ends of the crankshaft 11 are arranged to protrude from the crankcase 10 , and a fan body of the blower 80 is fixed to one end.

The other end protrudes from the crankcase 10 and is connected to a driven part of a plant (not shown).

The cylinder 20 is a cylindrical portion into which a piston (not shown) is reciprocally inserted, and the piston is connected to the crankshaft 11 via a connecting rod.

The cylinder 20 is formed so that the cylinder head 30 side is higher than the crankcase 10 side, and is formed to protrude obliquely upward from the crankcase 10 with the central axis inclined.

A plurality of fins for cooling are formed on the outer surface of the cylinder 20 .

The cylinder head 30 is provided at the end of the cylinder 20 opposite to the crankcase 10 side, and is provided with a combustion chamber, an ignition plug, an intake or exhaust port, an intake or exhaust valve, a moving valve driving mechanism, and the like.

Fins for cooling are formed on the outer surface of the cylinder head 30 .

A carburetor (carburetor) 40 is installed on the intake pipe, and supplies fuel spray by using the Venturi effect to form a mixed gas. breath.

The carburetor 40 has a throttle valve lever 41 .

The throttle lever 41 is connected to the shaft of the throttle valve, which is a butterfly valve that regulates the flow rate of fresh gas passing through the valve.

The throttle lever 41 is rotatable around the shaft, and the opening degree of the throttle valve changes according to the angular position of the throttle lever 41 .

In Embodiment 1, the front end portion of the throttle lever 41 that locks the end portion 121 of the governor lever 120 is configured to close the throttle valve by turning toward the governor lever 110 side.

The air cleaner 50 is configured by arranging a filter element made of filter paper or the like in a container-shaped casing made of a resin material, introduces external air, filters foreign matter such as dust, and supplies it to the carburetor 40 .

The muffler 60 reduces the acoustic energy of exhaust gas (burned gas) discharged from the exhaust port of the cylinder head 30 and releases it to the outside.

The fuel tank 70 is a container for storing gasoline which is fuel for the engine 1 .

The fuel tank 70 is disposed on the upper portion of the crankcase 10 and supplies gasoline to the float chamber of the carburetor 40 by free falling.

The blower 80 is provided adjacent to one end portion of the crankcase 10 in the direction of the rotational axis of the crankshaft 11 , and generates cooling air for cooling the engine 1 .

The blower 80 is formed by surrounding a fan main body fixed to the crankcase 10 with a blower case having a wind guiding effect.

Inside the blower 80, a recoil starter (recoil starter) for manually starting the engine by a user is provided.

The governor device 100 is a speed regulating mechanism that autonomously adjusts the rotation speed of the engine 1 (the rotation speed of the crankshaft 11 ).

The governor device 100 has a centrifugal governor mechanism (not shown), and includes a governor lever 110 , a governor lever 120 , a speed controller 130 , a governor spring 140 , and the like.

The centrifugal governor mechanism has a governor weight inside the crankcase 10 , and the governor weight is attached so as to be relatively displaceable in the radial direction with respect to the crankshaft 11 .

The governor weight is displaced radially outer with respect to the crankshaft 11 in accordance with an increase in the centrifugal force generated by the rotation of the crankshaft 11 (according to an increase in the rotational speed).

The governor lever 110 is provided to protrude outward from the upper surface portion of the crankcase 10 .

The governor lever 110 is formed to protrude substantially horizontally toward the upper side of the blower 80 from a rotation shaft 111 that is disposed substantially vertically and protrudes from the upper surface of the crankcase 10 . .

The governor lever 110 is linked to the displacement of the governor weight accompanying the increase in the rotational speed (rotational speed) of the crankshaft 11, and the convex end side is in the direction away from the carburetor 40 (counterclockwise in FIG. 2 ). Rotate upwards to pull the speed control lever 120 and drive the throttle control lever 41 to the direction of closing the throttle valve.

The governor lever 120 swingably connects both ends 121 , 122 to the front end of the throttle lever 41 of the carburetor 40 and the front end of the governor lever 110 , respectively, to link them.

The governor lever 120 is formed of, for example, a metal wire (rod), the main part is formed substantially straight, and the end 121 on the side of the throttle lever 41 and the end 122 on the side of the governor lever 110 are bent into a hook shape. form.

In addition, a governor spring connecting portion 123 is provided at a middle portion of the governor lever 120 slightly closer to the governor lever 110 side than the longitudinal central portion of the governor lever 120 . The governor spring connecting portion 123 is viewed from above. It is formed by bending into a crank shape so as to be convex or U-shaped.

A washer 124 is provided on the governor spring coupling portion 123 .

The washer 124 is formed in a disc shape with a circular opening in the center, and is fixed to the governor lever 120 by welding or the like in a state where the governor spring coupling part 123 is fitted into the opening.

The speed controller 130 is used to set the target rotational speed of the engine 1 by the user.

The speed controller 130 has a rod shape attached to the engine 1 so as to be swingable about a predetermined axis substantially parallel to the rotation axis 111 of the governor lever 110 .

The speed controller 130 has fixing means for fixing the tip of the rod at an arbitrary angular position.

In Embodiment 1, the shaft is provided adjacent to the crankcase 10 side of the carburetor 40 , and the speed controller 130 protrudes from the shaft from the cylinder head 30 side to the opposite side.

The governor spring 140 is a tension coil spring that pretensions the governor operating rod 110 in the direction of closing the throttle valve (clockwise in FIG. 2 ).

One end portion 141 of the speed regulating spring 140 is connected to the rod end portion of the speed controller 130 .

The other end 142 of the speed regulating spring 140 is connected to the speed regulating spring coupling part 123 provided in the middle part of the speed regulating lever 120 .

Both ends 141 and 142 of the speed regulating spring 140 are connected to the speed controller 130 and the speed regulating lever 120 so as to be able to swing within a predetermined angle range, respectively.

When the engine 1 is running, the centrifugal force acting on the governor weight increases corresponding to the increase in the rotational speed of the crankshaft 11, and the governor joystick 110 rotates in the counterclockwise direction in Fig. 2, but at this time, the governor spring 140 is stretched, the spring reaction force is increased, and a torque is generated to rotate the governor lever 110 in the clockwise direction in FIG. 2 .

Therefore, the opening of the throttle valve is determined according to the position of the governor lever 110 in a state where the centrifugal force of the governor weight rotating the governor lever 110 and the spring reaction force of the governor spring 140 are balanced. degree, the rotational speed of the engine 1 is maintained within a prescribed range.

Next, the effect of the governor device of the above-mentioned first embodiment will be described in comparison with the comparative example of the present invention described below.

In the comparative example and Example 2 described later, the parts that are substantially the same as those in Example 1 are given the same reference numerals and descriptions thereof are omitted, and differences will be mainly described.

Fig. 6 is a top view of a state in which an air cleaner, a fuel tank, and the like are removed from an engine having a governor device as a comparative example of the present invention, viewed from the upper surface.

FIG. 6 shows a surface corresponding to FIG. 2 in the first embodiment.

In the governor device of the comparative example, the governor spring connecting portion 123 is not provided on the governor lever 120 , and the end 142 of the governor spring 140 is engaged with the opening formed at the convex end of the governor lever 110 .

In the comparative example, since the speed regulating spring 140 is long, the resonance frequency is low, and resonance of the speed regulating spring 140 tends to easily occur when the engine 1 is vibrated from a plant or the like during operation.

Therefore, the rotational speed of the engine 1 becomes unstable, and the governor spring 140 may be damaged, and peripheral components such as the speed controller 130 and the governor lever 110 may be damaged.

In this regard, according to this embodiment, compared with the structure of the comparative example in which the end 142 of the speed regulating spring 140 is locked to the speed governor joystick, the length of the speed regulating spring 140 can be shortened, and the resonant frequency of the speed regulating spring 140 can be increased. (Natural frequency) is separated from the vibration frequency from the plant, etc., and the amplitude is also reduced to suppress resonance.

This prevents damage to the speed regulating spring 140 and damage to peripheral components, and improves the durability of the engine 1 without increasing the number of parts and the weight as in the prior art in which, for example, an anti-vibration material and a counterweight are added.

In addition, since the degree of freedom in setting the axial position of the coupling position of the governor spring 140 on the governor rod 120 is high, tuning of the resonance frequency of the governor spring 140 is easy even when Even when the vibration frequency is different, it can be handled by a simple design change.

Furthermore, it can be easily applied to an existing engine only by changing the design of the governor lever 120 and the governor spring 140 .

[Example 2]

Next, Embodiment 2 to which the speed governor device of the present invention is applied will be described.

Fig. 7 is a view of a connecting portion between a speed regulating lever and a speed regulating spring in the speed governor device of Embodiment 2 viewed from above.

In the second embodiment, instead of the washer 124 of the first embodiment, a resin-made fixing member 150 described below is used to prevent the speed regulating spring 140 from coming off from the end portion 142 .

The fixing member 150 is integrally formed by injection molding an elastic resin material.

The fixture 150 is formed in a substantially flat plate shape along the horizontal direction (direction along a plane including the U-shape of the main body portion of the governor lever 120 and the governor spring coupling portion 123 ).

The upper surface of the fixing tool 150 is dented to form a groove portion 151 into which the region including the governor spring coupling portion 123 of the governor lever 120 fits.

A part of the governor lever 120 including the governor spring coupling part 123 is fitted and held in the groove part 151 of the fixture 150 .

In the groove portion 151, an ear portion 152 for preventing the speed lever 120 from falling is provided.

The ear portion 152 is formed to protrude from a part of the groove side at the upper end portion of the groove portion 151 (the region near the upper surface of the fixture 150 ) to the center side of the groove.

The ear portion 152 has a function of pressing the rod in the groove portion 151 by its elastic force and preventing it from falling out of the groove portion 151 .

The convex end portion of the governor spring connecting portion 123 (the most eccentric region of the governor lever 120 from the main body) is arranged to protrude from one end of the fixing member 150, and the end 142 of the governor spring 140 is locked there. .

According to the second embodiment described above, in addition to the effect substantially the same as that of the first embodiment described above, by providing the fixing member 150 , it is possible to more reliably prevent the governor spring 140 from coming off the governor lever 120 .

In addition, an assembly worker can easily insert and fix the fixing member 150 of the above-mentioned resin molded product, thereby simplifying the assembly process, and does not require welding or the like like the washer 124 of the first embodiment.

(Modification)

The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and they are also within the technical scope of the present invention.

The shape, structure, material, manufacturing method, arrangement, number, and the like of each member constituting the governor device and the engine are not limited to those of the embodiments, and can be appropriately changed.

In addition, there is no particular limitation on the structure of the position where the governor spring is locked to the intermediate portion of the governor lever.

Claims (3)

1. a governor arrangement, it has:

Air throttle stick, it carries out opening and closing to air throttle, and the air imbibed quantity of electromotor is adjusted by this air throttle；

Speed regulator stick, it links with described air throttle stick via speed control rod, thinks highly of with to the speed governing being installed on bent axle Described air throttle stick correspondingly, is driven by the increase of the centrifugal force of hammer effect to the direction closed by described air throttle；With And

Governor spring, its by described speed regulator stick to the direction pretension that described air throttle is closed,

This governor arrangement is characterised by,

Described governor spring is draft helical spring, an end and the operating carrying out described electromotor of this draft helical spring The speed control that speed adjusts links, and the engaged part that another end and the mid portion at described speed control rod are formed is even Knot.

Governor arrangement the most according to claim 1, it is characterised in that

Described engaged part is the mid portion of described speed control rod to be bent into crank-like and is formed.

Governor arrangement the most according to claim 1 and 2, it is characterised in that

One end of described governor spring is limited to the nose portion being bent to crank-like of described speed control rod, and prevents The fixture that only an end of described governor spring comes off from described nose portion is limited to described speed control rod.