JP4474242B2 - Engine with mechanical governor - Google Patents

Description

The present invention relates to an engine with a mechanical governor, and particularly relates to an engine that can reduce idle rotation speed.

As a conventional engine with a mechanical governor, there is the following engine as in the present invention.
That is, as shown in FIG. 3A, the governor lever (101) is interlocked and connected to the governing lever (104) via the governor spring (105), and the governor force generating means (106) is linked to the governor lever (101). The governor lever (101) is swung by the unbalanced force between the governor spring force (105a) and the governor force (106a) of the governor spring (105),
When the throttle valve (103) is interlocked and connected to the governor lever (101) via the interlocking rod (102), one end (102a) of the connecting rod (102) is engaged with the rod engaging hole (101a) of the governor lever (101). The other end (102b) of the connecting rod (102) is engaged with the rod engaging hole (109b) of the throttle input arm (109) of the throttle valve shaft (108),
In order to suppress the rattling of the rod engagement holes (101a) (109b) and the ends (102a) (102b) of the connecting rod (102), the spring springs (101c) of the governor lever (101) are pulled by springs. One end portion (110c) of the backlash spring (110) having the structure is locked, and the other end portion (110d) of the backlash spring (110) is locked to the spring lock portion (109d) of the throttle input arm (109). An engine with a mechanical governor in which the play is suppressed by the urging force (110a) of the backlash spring (110).

  In this type of engine, the movement of the governor lever (101) is controlled by suppressing the rattling of the rod engaging holes (101a) (109b) and the ends (102a) (102b) of the connecting rod (102). There is an advantage that it is accurately transmitted to the valve (103) and the governor accuracy can be increased.

  However, in the conventional engine described above, the urging force (110a) of the backlash spring (110) applied to the throttle input arm (109) is directed to open the throttle valve (103). Has occurred.

The above prior art has the following problems.
<Problem> The idle rotation speed cannot be reduced sufficiently.
If the biasing force (110a) of the backlash spring (110) applied to the throttle input arm (109) is in the direction to open the throttle valve (103), the governor spring (105) is removed and the governor spring is removed. Even if the force (105a) is eliminated, the idle rotation speed cannot be sufficiently reduced. The reason for this is not clear, but the contact area between the outer peripheral edge of the throttle valve (103) and the inner peripheral surface of the surrounding passage wall (111) increases near the fully closed position of the throttle valve (103), and the friction It is expected that the throttle valve (103) stops before the original valve closing position due to resistance.

An object of the present invention is to provide an engine with a mechanical governor that can solve the above-described problems, that is, an engine with a mechanical governor that can reduce the idle rotation speed.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1A, the governor lever (1) is linked to the governing lever (4) via the governor spring (5), and the governor force generating means (6) is linked to the governor lever (1). The governor lever (1) is swung by the unbalanced force between the governor spring force (5a) and the governor force (6a) of the governor spring (5),
When interlocking the throttle valve (3) to the governor lever (1) via the interlocking rod (2), the one end (2a) of the connecting rod (2) is engaged with the rod engaging hole (1a) of the governor lever (1). The other end (2b) of the connecting rod (2) is engaged with the rod engaging hole (9b) of the throttle input arm (9) of the throttle valve shaft (8),
In order to suppress the rattling of the rod engaging holes (1a) (9b) and the ends (2a) (2b) of the connecting rod (2), the spring latching portion (1c) of the governor lever (1) is rattled. One end (10c) of the spring (10) is locked, and the other end (10d) of the backlash spring (10) is locked to the spring locking portion (9d) of the throttle input arm (9). In the engine with a mechanical governor in which the rattling is suppressed by the urging force (10a) of the stop spring (10),
By suppressing the rattling so that the biasing force (10a) of the rattling stop spring (10) applied to the throttle input arm (9) is in the direction to close the throttle valve (3) ,
In the opposite case, that is, the idle rotation speed can be reduced as compared with the case where the rattling spring biasing force applied to the throttle input arm is directed to open the throttle valve to suppress the rattling. It was way, mechanical governor with engine, characterized in that.

<Effect> It is possible to sufficiently reduce the idle rotation speed.
As exemplified in FIG. 1 (A), the biasing force (10a) of the backlash spring (10) applied to the throttle input arm (9) is adapted to close the throttle valve (3). The idle rotation speed can be sufficiently reduced. The reason for this is not clear, but in the conventional example illustrated in FIG. 3, the outer peripheral edge of the throttle valve (103) and the inner peripheral surface of the surrounding passage wall (111) in the vicinity of the fully closed throttle valve (103) The contact area of the throttle valve is increased and the frictional resistance causes the throttle valve (103) to stop before the original closed position. It is expected that the throttle valve (3) reaches the original closed position by the biasing force (10a) of the stop spring (10).

Embodiments of the present invention will be described with reference to the drawings.
FIGS. 1 and 2 are diagrams for explaining an engine with a mechanical governor according to an embodiment of the present invention. In this embodiment, a spark ignition gasoline engine of electronic fuel injection will be described.

The outline of this engine is as follows.
As shown in FIG. 2, the cylinder head (13) is assembled to the upper part of the cylinder block (12), and the head cover (14) is assembled to the upper part of the cylinder head (13). A gear case (15) is attached to the front portion of the cylinder block (12), a hanging transmission case (16) is attached to the front portion of the gear case (15), and a cooling fan (17) is attached to the front portion of the hanging transmission case (16). ). A flywheel (18) is disposed at the rear of the cylinder block (12). A throttle body (19) is attached to the side of the cylinder head (13).

The structure of the throttle body is as follows.
As shown in FIG. 2, the throttle body (19) includes an intake passage (20) therein, and a throttle valve (3) is accommodated in the intake passage (20). The throttle valve shaft (8) is sideways, and a throttle input arm (9) attached to the throttle valve shaft (8) is disposed beside the throttle body (19). The throttle valve (3) is controlled by a mechanical governor (20). An intake pressure sensor (21) is provided downstream of the throttle valve (3), and an injector (22) is arranged downstream thereof. The fuel (25) in the fuel tank (24) is pumped from the fuel pump (23) to the injector (22).

The means for controlling the fuel injection amount from the injector is as follows.
The valve actuator of the injector (22) is linked to the controller (26). The controller (26) is associated with an intake pressure sensor (21) and a rotation speed sensor (27). The engine speed is detected by the rotation speed sensor (27), and the intake pressure sensor (21) detects the intake pressure downstream of the throttle valve (3), thereby detecting the engine speed and the engine load. The valve opening time of 22) is controlled to adjust the fuel injection amount from the injector (22).

The configuration of the mechanical governor is as follows.
As shown in FIG. 1 (A), the governor lever (1) is interlocked and connected to the governing lever (4) via the governor spring (5), and the governor force generating means (6) is linked to the governor lever (1). The governor lever (1) is swung by an unbalanced force between the governor spring force (5a) and the governor force (6a) of the governor spring (5). The governor force generating means (6) is a governor weight. When the engine speed increases, the governor force (6a) increases, and when the engine speed decreases, the governor force (6a) decreases.

The structure of the throttle valve interlocking device is as follows.
As illustrated in FIGS. 1A to 1C, when the throttle valve (3) is interlocked and connected to the governor lever (1) via the interlocking rod (2), the rod engaging hole (1a) of the governor lever (1) is illustrated. ) Is engaged with one end (2a) of the connecting rod (2), and the other end of the connecting rod (2) is inserted into the rod engaging hole (9b) of the throttle input arm (9) of the throttle valve shaft (8). 2b) is engaged. The interlocking rod (2) is arranged in the vertical direction between the upper throttle input arm (9) and the lower governor lever (1). The upper end portion (2b) of the interlocking rod (2) is bent into a crank shape, and the laterally extending flange portion is inserted into the rod engagement hole (9b) at the tip portion of the throttle input arm (9). The lower end portion (2a) of the interlocking rod (2) is also bent in a crank shape, and the laterally extending flange portion is inserted into the rod insertion hole (1a) at the distal end portion of the governor lever (1). When the tip of the governor lever (1) rises, the tip of the interlocking rod (2) and the throttle input arm (9) lifts, the throttle valve (3) operates in the valve closing direction, and the tip of the governor lever (1) When lowered, the interlock rod (2) and the tip of the throttle input arm (9) are lowered, and the throttle valve (3) is operated in the valve opening direction.

The backlash prevention structure of the interlocking device is as follows.
In order to suppress the rattling of the rod engaging holes (1a) (9b) and the ends (2a) (2b) of the connecting rod (2), the spring latching portion (1c) of the governor lever (1) is rattled. One end (10c) of the spring (10) is locked, and the other end (10d) of the backlash spring (10) is locked to the spring locking portion (9d) of the throttle input arm (9). The play is suppressed by the urging force (10a) of the stop spring (10). The backlash spring (10) is also arranged in the vertical direction, like the interlocking rod (2). The coil portion of the backlash spring (10) is externally fitted to the interlocking rod (2). The spring locking portion (1c) of the governor lever (1) is also used as the rod locking hole (1a). The spring locking portion (9d) of the throttle input arm (9) is a spring locking hole. The upper end (10d) of the backlash spring (10) is bent into a hook shape and is locked in the spring locking hole (9d) of the throttle input arm (9). The lower end portion (10c) of the rattling stop spring (10) is also bent into a hook shape and locked in the rod locking hole (1a).

The device for the rattle prevention structure is as follows.
As shown in FIG. 1 (A), the biasing force of the backlash stopper spring according to the throttle input arm (9) (10) (10a) is set to be the direction for closing the throttle valve (3), said backlash By suppressing the backlash, the reverse case, that is, compared with the case where the backlash of the backlash spring applied to the throttle input arm is directed to open the throttle valve so that the backlash is suppressed. The idle rotation speed can be reduced. That is, the spring engaging portion (9d) of the throttle input arm (9) is arranged so as to be opposite to the rod engaging hole (9b) across the rotation center (28) of the throttle valve shaft (8). ing. By doing so, it is possible to sufficiently reduce the idling rotational speed during idling operation in which the speed control lever (4) is shifted to the low speed side and no external load is applied to the engine. As a result of the experiment, the prior art shown in FIG. 3, that is, the upper end portion (110d) of the backlash spring (110) is engaged with the rod engagement hole (109b) of the throttle input arm (109), and the throttle input arm (109 ), The idle rotation speed can be reduced by about 1000 rpm, compared with the case where the biasing force (110a) of the backlash spring (110) is directed to open the throttle valve (103).

1A and 1B are schematic diagrams for explaining the interlocking of a throttle valve from a mechanical governor of an engine according to an embodiment of the present invention, FIG. 1A is an overall view, and FIG. 1B is a cross-sectional view taken along line BB in FIG. FIG. 1 (C) is a cross-sectional view taken along the line CC of FIG. 1 (A). 1 is a side view of an engine according to an embodiment of the present invention. 3A and 3B are schematic diagrams for explaining the interlocking of the throttle valve from the mechanical governor of the engine according to the prior art, FIG. 3A is an overall view, FIG. 3B is a cross-sectional view taken along the line BB of FIG. (C) is CC sectional view taken on the line of FIG. 3 (A).

(1) ... governor lever, (1a) ... rod engaging hole, (1c) ... spring locking part, (2) ... interlocking rod, (2a) ... one end, (2b) ... other end, (3) ... Throttle valve, (4) ... governing lever, (5) ... governor spring, (5a) ... governor spring force, (6) ... governor force generating means, (6a) ... governor force , (8) ... throttle valve shaft, (9) ... Throttle input arm, (9b) ... Rod engaging hole, (9d) ... Spring locking portion, (10) ... Backlash spring, (10a) ... Biasing force, (10c) ... One end, (10d ) ... the other end.

Claims (1)

The governor lever (1) is interlocked with the governor lever (4) via the governor spring (5), and the governor force generating means (6) is linked to the governor lever (1) so that the governor spring force of the governor spring (5) ( 5a) and the governor force (6a) are caused to swing the governor lever (1) by the unbalanced force,
When interlocking the throttle valve (3) to the governor lever (1) via the interlocking rod (2), the one end (2a) of the connecting rod (2) is engaged with the rod engaging hole (1a) of the governor lever (1). The other end (2b) of the connecting rod (2) is engaged with the rod engaging hole (9b) of the throttle input arm (9) of the throttle valve shaft (8),
In order to suppress the rattling of the rod engaging holes (1a) (9b) and the ends (2a) (2b) of the connecting rod (2), the spring latching portion (1c) of the governor lever (1) is rattled. One end (10c) of the spring (10) is locked, and the other end (10d) of the backlash spring (10) is locked to the spring locking portion (9d) of the throttle input arm (9). In the engine with a mechanical governor in which the rattling is suppressed by the urging force (10a) of the stop spring (10),
By suppressing the rattling so that the biasing force (10a) of the rattling stop spring (10) applied to the throttle input arm (9) is in the direction to close the throttle valve (3) ,
In the opposite case, that is, the idle rotation speed can be reduced as compared with the case where the rattling spring biasing force applied to the throttle input arm is directed to open the throttle valve to suppress the rattling. It was way, mechanical governor with engine, characterized in that.

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