JPH06607Y2 - Engine speed limiter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to an engine speed limiting device.

2. Description of the Related Art In a general-purpose engine used to drive a generator and various other work machines, a stopper for setting the maximum allowable rotation speed of the engine is attached.

FIG. 7 and FIG. 8 show an example of such a rotation speed limiting device, in which an operating regulator handle (at the outer end of the engine body side shaft (1) such as a gearbox ( 2) is attached, and a lever (3), which is also provided at the inner end of the shaft (1), is interlockingly connected to a governor lever (5) on the speed governor side via a regulator scring (4).

When the regulator handle (2) is rotated, the regulator spring (4) is pulled via the shaft (1) and the lever (3), which changes the engine speed. When the knob (6) at the tip of the handle (2) is rotated to the left, the speed is increased, and when it is rotated in the opposite direction, the speed is decreased.

A limit stopper (7) made of a bolt that regulates the maximum rotation speed is screwed into the side of the regulator handle (2), and the tip of the stopper (7) rotates the regulator handle (2). It projects in the middle of the range. When a contact portion (8) obtained by bending one part of the regulator handle (2) in a direction perpendicular to the rotation direction contacts the tip of the limit stopper (7), the speed increasing side of the regulator handle (2). The rotation of the engine is restricted to prevent the engine speed from further increasing. The limit stopper (7) is used to adjust the maximum number of revolutions of the engine at the time of shipment, and once adjusted, the limit stopper (7) is used to prevent the user from performing an adjusting operation. The stopper (7) is fixed with a wire (9) and sealed. That is, if the user is allowed to freely operate the limiting stopper (7), the engine may be used at a speed exceeding the permissible rotational speed, which may cause engine failure.

The maximum rotation speed regulated by the limit stopper (7) is also the rotation speed used by the engine. For example, in the case of an engine that drives a generator, the maximum rotation speed and The rotation speed is set to, for example, 2600 rotations according to the generator, and when the regulator handle (2) is rotated to a position where it contacts the limiting stopper (7), the rotation speed is automatically set to the used rotation speed. It will be.
However, this is sufficient when the engine is always used at a constant rotation speed, but when driving a plurality of work machines having different rotation speeds, for example, the one with the higher rotation speed is used as the limit stopper. Even if it is set by (7), when using it at a lower rotation speed than the other, the rotation speed is finely controlled while the regulator handle (2) is delicately controlled at a position away from the limit stopper (7). Must be set. In addition, even with the same work machine, in the case of a generator, its output is divided into a region of 60 Hz and a region of 50 Hz, and when used across both of these regions, the generator output is At the same time, it is necessary to adjust the engine speed each time. In such a case, in the conventional device, the regulator handle (2) needs to be finely adjusted when it is used at a rotation speed lower than the maximum rotation speed allowed by the limit stopper (7). It was impossible for the user to make such adjustments accurately. Therefore, conventionally, in accordance with the demand of the user or the working machine manufacturer who uses the engine, there is no choice but to set various types of engines having different maximum rotation speeds, and there are various types of engine specifications. It had the drawback of being significantly more expensive.

As a means for adjusting this number of revolutions when the number of revolutions less than the maximum number of revolutions is specified by eliminating this drawback, Japanese Patent Application Laid-Open No.
-87927 discloses a fuel limiting device in a control device for an internal combustion engine.

This fuel limiting device is configured such that a limiting pin urged by a backup spring is housed in a holder screwed to a governor case, and the limiting pin comes into contact with a contact portion of the governor lever, whereby It is possible to limit the maximum rotation angle, that is, the maximum injection amount of fuel, and adjust the maximum injection amount of fuel according to the application of the engine by making the holder screw type. It was made possible.

However, in this fuel limiting device, since the maximum injection amount of fuel is adjusted by the screw-type holder, this holder is a screw-type, so it may loosen, and if this adjustment is hindered. However, there is a drawback that stable adjustment cannot be performed.

In addition, the maximum fuel injection amount is restricted to the maximum engine speed and sealed, and the maximum engine speed can be adjusted at a rotational speed lower than the restricted maximum engine speed. There is a diesel engine speed control device disclosed in Japanese Patent Laid-Open No. 54-79322.

This is because the maximum rotation restriction bolt and the speed adjustment lever fixing bolt are placed on both sides of the speed adjustment lever in the rotation direction, and the maximum rotation restriction bolt is sealed at the maximum rotation restriction position and the speed adjustment lever is fixed. While the operation bolt can be moved and operated, an adjusting nut is provided at the tip of the maximum rotation restricting bolt so that the tip of the adjusting nut can protrude beyond the tip of the maximum rotation restricting bolt.

Then, the position of the speed adjusting lever is changed by screwing the adjustment nut forward and backward to adjust the rotation speed.

However, in the above device, since the lock nut that abuts against the adjustment nut is used to fix the adjustment nut in the predetermined position, if the lock nut becomes loose, the position of the adjustment nut is fixed. There was a drawback that the condition became unstable.

In addition, there is a drawback in that this work is troublesome because the lock nut needs to be screwed in and out again each time the adjustment nut is screwed in and out to perform locking.

This invention eliminates the above-mentioned conventional drawbacks, and even if the engine has a plurality of rotation speeds, the user can easily set those rotation speeds and the structure is simple. With respect to the first stopper that regulates the maximum rotation speed, the second stopper that adjusts the maximum rotation speed at a lower rotation speed can be stably held in the adjustment completed state, and this adjustment can be performed. An object of the present invention is to provide a rotation speed limiting device that can be accurately performed.

Means for Solving the Problems And, in order to achieve the above-mentioned object, in the present invention, a stopper with which the contact portion on the regulator handle side abuts is provided in the middle of the rotation range of the regulator handle, and by this stopper A first stopper which regulates a certain number of revolutions to the maximum number of revolutions of the engine, and a second stopper which can adjust the maximum number of revolutions at a lower number of revolutions, for regulating the maximum number of revolutions of the engine An elastic positioning mechanism for holding the second stopper in the rotation speed adjustment completed state by elasticity after completion of the rotation speed adjustment by the second stopper is provided.

Action The second stopper can change the engine speed during use, while the first stopper is sealed to prevent use beyond the allowable speed.

The second stopper is naturally and stably held as it is by the elasticity of the elastic positioning mechanism after the rotation speed adjustment is completed.

Embodiment FIG. 1 and FIG. 2 show a first embodiment of the present invention.

A first stopper (11) formed in the shape of a hollow cylinder is screwed into the main body (12) on the engine side. (13) is the first
Lock nut for holding the stopper (11) of
Similarly, (14) shows a wire similar to the conventional one in which the first stopper (11) is sealed so as not to be operated by the user. A second stopper (15) is screwed into the hollow portion of the first stopper (11) so as to pass through the stopper (11). A large-diameter stopper portion (16) is formed at the tip of the second stopper (15). The shaft (1
Abutment part of regulator handle (18) attached to 7)
The (19) abuts on the stopper portion (16), thereby preventing the regulator handle (18) from being rotated any more, thereby limiting the maximum rotation speed. At this time, when the second stopper (15) is screwed into the first stopper (11) by changing the screwing depth, for example, when the stopper portion (16) is projected to the regulator handle (18) side, The maximum engine speed is set to a lower speed.

On the outer peripheral surface of the second stopper (15), the first stopper
In (11), as shown in FIG. 2, a flat surface portion (20) is formed over a certain length in the screwing direction. On the other hand,
The first stopper (11) is provided with a ball (23) biased inward by a coil spring (22) in a hole (21) formed in the diametrical direction. ) Abuts the flat surface portion (20) and holds the second stopper (15) at that position. In this embodiment, the flat portion (2
The elastic positioning mechanism is constituted by 0), the hole (21), the coil spring (22), and the ball (23). Then, the second stopper (15) is rotated by applying a slightly strong force to the first stopper (15).
When the screwing depth of the stopper (11) to the stopper (11) is changed, the spring (22) is compressed to ride on the flat portion (20) from the outer periphery to the ball (23 ) Drop, the resistance force during rotation decreases suddenly, so by counting the number of times, you can see how many revolutions have been made. If you know it, you can set the maximum speed to any speed. Also, the second stopper (15)
When rotated to the side retracting from the regulator handle (18), the large-diameter stopper portion (16) causes the first stopper (11) to move.
It cannot be adjusted by contacting the end face (11a) of the engine and increasing the engine speed any further.Therefore, if the engine speed is set to the maximum permissible speed, it will exceed the permissible speed. Can be prevented.

3 and 4 show the ball (23) and the coil spring (22).
This is an example in which a leaf spring is used instead of the positioning mechanism consisting of. That is, the first stopper (11) corresponds to the flat surface portion (20) formed on the outer periphery of the second stopper (15).
The notch (24) is formed on the bottom surface so as to expose the flat surface (20). One part of the outer circumference of the annular leaf spring (25) externally fitted to the first stopper (11) is caulked inward so as to fit into the notch (24), and hits the flat portion (20). Touching. When the second stopper (15) is rotated, the leaf spring (2
The caulking portion (25a) of 5) rides up from the flat surface portion (20) to the outer peripheral portion, but when riding on the flat surface portion (20) again, the resistance force sharply decreases, and one rotation can be counted as described above.

FIG. 5 shows the coil spring (22) and the ball (23) of FIG.
Is inserted into the hole (26) of the main body (12). The first stopper (11) extends up to the middle of the screw hole in the main body (12), and the tip of the second stopper (15) that also protrudes into the screw hole of the main body (12). The large-diameter stopper portion (16) abuts against the stopper surface (11a) at the tip of the first stopper (11) in the screw hole so that the large-diameter stopper portion (16) cannot be adjusted beyond the maximum permissible rotation speed. Further, the flat surface portion (20) with which the ball (23) contacts is formed on the outer periphery of the stopper portion (16) which is formed to be long.

FIG. 6 shows a main body (1) instead of the ball (23) shown in FIG.
A pin (27) is inserted into 2) and the pin (26) is brought into contact with the flat surface portion (20). The operation is similar to that of the leaf spring (25) shown in FIGS. 3 and 4.

As described above, in the present invention, by operating the first stopper, it is possible to change and adjust the maximum rotation speed according to the type of the working machine to be used. There is an effect that it is not necessary to set various types of specifications having different maximum rotation speeds according to the demands of the operator or the demand of the work equipment manufacturer. Moreover, by sealing the first stopper with a wire or the like, there is no possibility that the first stopper will be used beyond the maximum allowable rotation speed set by the first stopper.

Further, since the second stopper is held in the rotation speed adjustment completed state by the elastic positioning mechanism, the rotation speed adjustment state by the second stopper can be made stable.

[Brief description of drawings]

FIG. 1 is a vertical sectional plan view of an essential part of an apparatus showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 shows a second embodiment of the present invention. A vertical plan view of the main part of the limiting device,
FIG. 4 is a sectional view taken along line BB of FIG. 3, and FIG.
FIG. 6 is a longitudinal sectional plan view of a main part of a limiting device showing another embodiment of the present invention, FIG. 6 is a cross-sectional view of the main part of another embodiment showing a positioning mechanism for a second stopper, and FIG. FIG. 8 is a vertical sectional plan view of a main part of the limiting device, and FIG. (11) ... First stopper, (15) ... Second stopper, (18) ... Regulator handle, (20) ... Flat part, (21) ... Hole, (22) ... Coil spring, (23) ... Ball, (24) ... notch, (25) ... leaf spring, (25a) ... caulking part, (26) ... hole, (27) ... pin.

Claims (1)

[Scope of utility model registration request] 1. A stopper provided with an abutting portion (19) on the regulator handle (18) side is provided in the middle of the rotation range of the regulator handle (18), and the stopper regulates the maximum engine speed. The first stopper (11) adjusted to make a certain rotation speed the maximum rotation speed of the engine, and the second stopper (15) capable of adjusting the maximum rotation speed at a lower rotation speed Becomes
After the rotation speed adjustment by the second stopper (15) is completed,
An engine speed limiting device comprising an elastic positioning mechanism for elastically holding the second stopper (15) in the rotational speed adjustment completed state.