JP3211072B2 - Fuel limiting device for diesel engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel limiting device for a diesel engine.

[0002]

2. Description of the Related Art In general, in a diesel engine mounted on an agricultural work machine or the like, in order to provide low-speed and high-torque characteristics in an overload operation state, a fuel injection amount in a low-speed region is increased to such an extent that incomplete combustion does not occur. In addition, the engine is made to exhibit the tenacity, and in a lower unused rotational speed range, the fuel injection rate is not increased so as not to cause incomplete combustion. For this purpose, a fuel limiting device is attached to a governor device of a diesel engine to control a fuel injection rate in a low speed range.

The basic structure of a fuel limiting device for a diesel engine to which the present invention is applied is configured as follows.
That is, as shown in FIGS. 5 (A), 6 and 7, the governor lever 1 of the centrifugal governor G is urged toward the fuel increasing side R by the spring force SF of the governor spring 8, and the input portion 4 of the governor lever 1 is moved. Is reduced by the governor force GF.
, The output portion 5 of the governor lever 1 is connected to the fuel metering rack 9 of the fuel injection pump 6 in an interlocking manner, and the governor lever 1 is configured to be swingable with an unbalanced force between the governor force GF and the spring force SF. Then, the fuel restrictor 10 is fixed to the governor wall 25a (25) of the centrifugal governor G or one governor lever 1a (hereinafter, referred to as a fixed portion) of the two-lever governor device.

As shown in FIGS. 1 to 4 and FIGS. 6 to 7, the fuel restricting device 10 includes the fixed portion 25a (25).
Or main body case 11 fixed to 1a so as to be adjustable forward and backward
The base end portion 12b is housed in the main body case 11, and the front end portion 12a protrudes from the front end side of the main body case 11 so as to be able to advance and retreat, and faces the receiving portion 37 formed on the governor lever 1 so as to be able to elastically contact. A torque pin 12, a torque spring 13 housed in the main body case 11 and resiliently receiving the torque pin 12, and screwed into the main body case 11 so as to be able to advance and retreat from the rear, and an elastic force of the torque spring 13. Spring adjuster 14 for adjusting
Is provided so as to be able to advance and retreat through the spring adjuster 14.
The restricting pin 15 and the torque
The withdrawal Iriryou t of Kupyn 12 become comprises a pin metering device 16 which metered allow regulated, the overload operation state, the torque
Kupin 12 can advance and retreat to receiving part 37 of governor lever 1
By repression abutment on ability to swing between the governor lever 1 is the full load position (4/4) and torque up position (Tu)
It is configured to:

[0005] As a prior art of this type, one disclosed in Japanese Utility Model Publication No. 57-22028 proposed by the present applicant is known. As shown in FIG. 7, it is screwed into the main body case 11 so as to be able to advance and retreat from the rear.
The insertion hole 15a of the regulating pin 15 for inserting the shaft core is relatively short. Further, the helical torque spring 13
Are fitted on the regulation pin 15 with a large play gap. The spring adjuster 14 and the pin adjuster 16
Is fixed by caulking a plurality of portions of the screwed portion after the adjustment.

[0006]

In the above prior art, since the spring adjuster 14 is short, when the screw screw portion is caulked and fixed after the adjustment is completed, the regulating pin 15 is slightly reduced due to the screw screw gap. And there is a possibility that sliding resistance may occur. If the pin insertion hole 15a is enlarged to eliminate the sliding resistance, the regulation pin 15 may be inclined and interfere with the helical helical torque spring 13. That is, in the above-described conventional example, the torque spring 13 is fitted over the regulation pin 15 with a large play gap in order to avoid interference between the regulation pin 15 and the torque spring 13.
1 cannot be reduced in size. In particular, when the fuel restrictor 10 is fixed to one governor lever 1a of the two-lever governor device, inconveniences such as an increase in the swing inertia of the governor lever 1a occur.

The present invention has been made in view of such circumstances. When the spring adjuster 14 is crimped and fixed, the inclination of the regulating pin 15 is eliminated, and the torque spring 13 is slightly loosened. It is a technical object to eliminate the possibility that the regulating pin 15 is inclined and interfere with the torque spring 13 even when the regulating pin 15 is fitted to the outside with a gap, and also reduce the outer shape of the main body case 11.

[0008]

In order to achieve the above object, the present invention is configured as follows. That is, according to the present invention, in the fuel limiting device for a diesel engine having the basic structure, the main body case 11 is provided with a centering hole 18 connected to a tip end of a screw hole 17 for screwing the spring adjuster 14 forward and backward. And the spring adjuster 14 comprises:
A threaded portion 17a to be screwed into the threaded hole 17 has a centering portion 18a which is loosely fitted to the centering hole 18, and the torque spring 13 is fitted to the regulating pin 15 with a play gap. It is characterized by the following.

[0009]

According to the present invention, the main body case 11 has a centering hole 18 connected to the screw hole 17 for screwing the spring adjuster 14 forward and backward.
4 has a centering portion 18a that fits loosely with the centering hole 18 at the distal end side of the screw portion 17a screwed into the screw hole 17, so that the centering portion 18a of the spring adjuster 14 is 11 is fitted into the above-mentioned centering hole 18, and the axes of the main body case 11 and the spring adjuster 14 match. That is,
When the screw threaded portion is caulked and fixed after the adjustment of the spring adjuster 14 is completed, the spring adjuster 1
There is no danger that the axis of 4 will be tilted and thus the control pin 15 will be tilted.

Further, although the torque spring 13 is fitted around the regulation pin 15 with a play gap, there is no possibility that the regulation pin 15 is inclined. Therefore, there is no possibility that the regulation pin 15 is inclined and interferes with the torque spring 13. . Further, the torque spring 13 is fitted around the regulating pin 15 with a play gap, but by reducing the play gap, the outer shape of the main body case 11 can be reduced, and the two-lever fuel restrictor 10 can be used. One governor lever 1 of the governor device
In the case where the governor lever 1a is fixed to the position a, no problem such as an increase in the swing inertia of the governor lever 1a occurs.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment according to the present invention, respectively.
FIG. 5 is a longitudinal sectional view of a main part of a fuel limiting device showing a fourth embodiment,
FIG. 2 is a schematic overall view showing an assembled state of the fuel limiting device. First, the assembly arrangement of the present fuel limiting device is shown in FIGS.
This will be described below.

As shown in FIG. 5 (B), the fuel injection pump 6 is accommodated in a pump chamber 30 provided in the diesel engine, and a fuel injection camshaft 24 is pivotally supported at a lower portion thereof.
The fuel injection pump 6 can be driven to be injected by the fuel injection cam shaft 24. As shown in FIGS. 5 (A) and 5 (B), the governor lever 1 pivotally supports the outer arm 1a and the inner arm 1b so as to be able to swing together with a pivot shaft 23, and is disposed adjacent to the inside and outside of the pump chamber 30. A governor weight 2 of a centrifugal governor G is arranged below the pump chamber 30, and the governor weight 2 is operatively connected to an input portion 4 of the inner arm 1b via a governor sleeve 3 to provide a fork-like output of the inner arm 1b. The part 5 is connected to the metering rack pin 9 of the fuel injection pump 6.
Engages.

As shown in FIGS. 5B and 5C, the pump chamber 13
The governing lever 22 is pivotally supported by a side wall 25 around a pivot shaft 26 so as to be swingable. The outer arm 1a of the governor lever 1 is connected to the governing lever 22 via a governor spring 8, and the governor lever 1 is controlled by the governor. The governor force GF of the weight 2 and the spring force of the governor spring 8 are configured to be swingable by an unbalanced force. As shown in FIG. 5 (C), a rectangular flat receiving portion 3 is attached to the outer arm 1a of the governor lever 1.
7 and a fixed wall 25 is formed on the side wall 25 of the pump chamber 13.
a, the fuel restrictor 10 is screwed into the fixed wall 25a, and the restrictor 12 of the fuel restrictor 10 faces the receiving portion 37 so as to be able to elastically contact with the receiving portion 37 from the rear.
Is configured to be able to restrict swinging to the full load position (4/4) by the restrictor 12 of the fuel restrictor 10. Reference numeral 20 denotes a lock nut for positioning and holding the fuel restricting tool 10 on the fixed wall 25a.

[0014] As shown in FIG.
Has the same basic structure as the conventional example (FIG. 7). That is, the main body case 11 is fixed to the fixed wall 25 as a fixed portion.
The torque pin 12, which is a limiter, is accommodated in the main body case 11 and its distal end 12a protrudes from the distal end side of the main body case 11 so as to freely advance and retreat. The receiving portion 37 is formed so as to be able to be pressed against the receiving portion 37. The helical torque spring 13 is housed in the main body case 11,
The torque pin 12 is elastically urged forward. The spring adjuster 14 is screwed into the main body case 11 so as to be able to advance and retreat from the rear, and adjusts the elastic force of the torque spring 13. The regulating pin 15 is provided so as to be able to advance and retreat through the spring adjuster 14, and is received by a male screw-shaped pin adjusting tool 16 to regulate the retreat amount t of the torque pin 12. The pin adjusting tool 16 is screwed into a screw hole 17 in the main body case 11 so as to be able to advance and retreat from the rear, and receives the regulating pin 15 so as to be able to adjust.

In this fuel limiting device, when the governor lever 1 shifts to the full load position (4/4) in the high-load operation state (see FIG. 5A), the receiving portion 37 of the outer arm 1a of the governor lever 1 changes the fuel. It comes into contact with a torque pin 12 which is a limiting tool of the limiting tool 10. Governor force G during overload operation
When F is weakened and the governor lever 1 shifts from the full load position (4/4) to the fuel increasing side (R), the receiving portion 37 of the governor lever 1 presses and biases the torque pin 12 of the fuel restrictor 10 rearward. The torque pin 12 is pushed into the main body case 11 against the elastic force of the torque spring 13.

When the governor lever 1 is in the torque-up position (Tu)
When swinging up to this point, the regulating pin 15 is regulated by the pin adjusting tool 16 and regulates the retreat amount t of the torque pin 12. This restricts the governor lever 1 to the torque-up position (Tu). In addition, in order to adjust the retreat amount t of the torque pin 12 corresponding to the torque-up position (Tu), the movement amount of the regulating pin 15 is independently adjusted by the pin adjusting tool 16.

That is, as the engine speed decreases due to the overload operation, the governor lever 1 moves to the full load position (4 /
4) After swinging toward the fuel increasing side (R) and the receiving portion 37 of the governor lever 1 comes into contact with the torque pin 12, until the torque pin 12 is regulated by the pin adjusting tool 16 via the regulating pin 15, the torque pin is stopped. 12 is a torque spring 13
Is pushed into the main body case 11 against the resilience. Exhibits low speed high torque characteristics between a full load position (4/4) and torque up position (Tu), engine Ru tenacity originating volatilization be <br/>. On the other hand, the governor lever 1 is in the torque-up position (T
u), the torque-up position (T
Excessive fuel injection beyond u) will not occur.

Hereinafter, the characteristic configuration of the fuel-fuel limiting device will be described. As shown in FIG. 1, the body case 11 has a screw hole 1 for screwing the spring adjuster 14 forward and backward.
7 has a centering hole 18 connected to the front end side thereof. The spring adjuster 15 has a centering portion 18a that fits loosely into the centering hole 18 at the tip end of a screw portion 17a screwed into the screw hole 17. Further, the helical torque spring (13) is fitted on the regulating pin 15 with a small play gap.

As described above, the centering portion 18a of the spring adjuster 14 is fitted into the centering hole 18 of the main body case 11, and the axis of the main body case 11 and the axis of the spring adjuster 14 match. When the screwing portion is fixed by caulking after the adjustment of the adjusting tool 14 is completed, there is no possibility that the axis of the spring adjusting tool 14 is inclined with respect to the main body case 11 and the regulating pin 15 is also inclined.

Further, the torque spring 13 is fitted around the restriction pin 15 has a Joint Gap gap, possibility interfering since fear will not limit pin 15 tilts, the torque spring 13 regulating pin 15 is inclined It is gone. further,
The torque spring 13 is fitted around the regulating pin 15 with a play gap .
When the fuel restrictor 10 is fixed to one governor lever 1a of the two-lever governor device, the outer shape of the main body case 11 can be reduced, and disadvantages such as an increase in the swing inertia of the governor lever 1a are as follows. Does not occur.

In the case of the first embodiment (FIG. 1), the amount of movement of the regulating pin 15 is adjusted by the pin adjusting tool 16 to set the retreat amount t of the torque pin 12, and then the screw is set from behind. Although the screw portion is fixed by caulking, there is a possibility that the set amount t of retraction of the torque pin 12 is deviated in the direction of decreasing. The reason is that, starting from a state in which the pin adjusting tool 16 is pressed against the regulating pin 15, the pin adjusting tool 16 is screwed back by a predetermined rotation angle to set the retreat amount t of the torque pin 12. When pressed against the pin 15, the play gap δ of the screw threaded portion should be located in front of the thread of the pin adjusting tool 16.

However, when the screwed portion is fixed by caulking from behind, as shown in the enlarged portion I of FIG.
The play gap δ of the screw threaded portion is located behind the thread of the pin adjusting tool 16, and the retreat amount t of the torque pin 12 is reduced by the play gap δ of the screw threaded portion. Therefore, in the second to fourth embodiments, the inconvenience described above has been solved as follows.

FIG. 2 shows a second embodiment of the fuel limiting device according to the present invention. This second embodiment differs from the first embodiment in that the pin adjusting tool 16 is locked by a lock nut 21. Is similar to that of the first embodiment (FIG. 1). That is, in the second embodiment, the lock nut 21 is screwed into the pin adjusting tool 16 projecting rearward of the main body case 11, and the lock nut 21 is brought into contact with the rear end face of the main body case 11, so that the pin adjusting tool 16 It is a structure to lock.
As a result, as shown in the main part enlarged portion II of FIG.
At the time of setting the retreat amount t), the play clearance δ of the screw threaded portion is located in front of the thread of the pin adjuster 16, and the retreat amount t of the torque pin 12 is reduced. You will not go crazy.

FIG. 3 shows a third embodiment of the fuel restricting device according to the present invention. In this third embodiment, a pin nut-like pin metering tool 16a can be freely advanced and retracted from the male screw 11a of the main body case 11 from the rear. , And receives the regulating pin 15 so as to be capable of metering. Then, the pin metering tool 16a is
The second embodiment differs from the first and second embodiments in that the lock is performed by a lock nut 21a screwed into the male screw 11a, and the other points are configured in the same manner as the first embodiment (FIG. 1). Thus, as in the second embodiment, the retreat amount t of the torque pin 12 does not change from the setting time.

FIG. 4 shows a fourth embodiment of the fuel restricting apparatus, which corresponds to the second aspect of the present invention. In the fourth embodiment, a male screw-shaped pin adjusting tool 16b is screwed into a female screw 14a in the rear half of the spring adjusting tool 14 from the rear so as to be able to advance and retreat, and the control pin 15 is received so as to be adjustable. Then, the pin adjusting tool 16b is projected to the rear of the main body case 11, the lock nut 21b is screwed into the pin adjusting tool 16b, and the lock nut 21b is brought into contact with the rear end face of the main body case 11 to make the pin adjusting tool The point that the lock 16b is locked is different from the first to third embodiments, and the other points are configured in the same manner as the first embodiment (FIG. 1). Thus, as in the second embodiment, the retreat amount t of the torque pin 12 does not change from the setting time.

FIG. 6 shows an embodiment in which the fuel limiting device according to the present invention is applied to a two lever governor device. In this embodiment, the main body case 11 of the fuel restricting device 10 is fixed to a first governor lever 1a, which is a fixed portion, so as to be able to advance and retreat, and a front end portion 12a of the torque pin 12 is formed on a receiving portion 37 formed on the second governor lever 1b. Face to be able to contact. Further, a stopper 32 protrudes from the governor wall 25, and a second receiving portion 3 formed on the second governor lever 1b.
8 is accessible.

The torque spring 1 of the fuel restrictor 10
The resilience of No. 3 is set to a value weaker than that of the governor spring 8, and the engine is in a no-load operation state (0/4) to a full-load operation state.
In (4/4), with the receiving portion 37 of the second governor lever 1b fully pushing the torque pin 12 of the fuel restrictor 10, the tension of the governor spring 8 and the start spring 33 and the balance force of the governor force GF are used. The first governor lever 1a and the second governor lever 1b swing together.

The first governor lever 1a is in the full load position (4/4)
Then, the second receiving portion 38 of the second governor lever 1b contacts the stopper 32. When the governor force GF further weakens due to the engine being overloaded, the torque spring 13 of the fuel restrictor 10
As a reaction, the first governor lever 1a shifts to the fuel increasing side (R) from the full load position (4/4), and when the torque pin 12 reaches the maximum projecting amount t, the first governor lever 1a 1a is the torque-up position (T
rock up to u). That is, as the engine speed decreases due to the overload operation, the first governor lever 1a swings from the full load position (4/4) to the fuel increasing side (R), and the torque increases with the full load position (4/4). During the up position (Tu), the engine exhibits low speed and high torque characteristics, and the engine exhibits tenacity.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a main part of a fuel limiting device for a diesel engine according to a first embodiment.

FIG. 2 is a longitudinal sectional view of a main part of a fuel limiting device for a diesel engine according to a second embodiment.

FIG. 3 is a longitudinal sectional view of a main part of a fuel limiting device for a diesel engine according to a third embodiment.

FIG. 4 is a longitudinal sectional view of a main part of a fuel limiting device for a diesel engine according to a fourth embodiment.

FIG. 5 is a schematic overall view of the fuel limiting device, and FIG.
1 is a perspective view, FIG. 1 (B) is a vertical sectional side view, and FIG. 1 (C) is a main part front view.

FIG. 6 is a schematic view of a two lever governor device to which the fuel restrictor according to the present invention is applied.

FIG. 7 is a longitudinal sectional view of a main part of a fuel limiting device for a diesel engine showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... governor lever, 2 ... governor weight, 4 ... governor lever input part, 5 ... governor lever output part, 6 ... fuel injection pump, 8 ... governor spring, 9 ... fuel injection pump fuel metering tool, 10 ... fuel limiting tool, 11 ... body case,
Reference numeral 12 denotes a restrictor, 12a denotes a distal end of the restrictor, 12b denotes a base end of the restrictor, 13 denotes a helical torque spring, and 14 denotes a helical torque spring.
Spring adjuster, 15: regulating pin, 16: pin adjuster, 17
... Screw hole in the main body case, 17a ... Screw part of spring adjuster, 18 ... Center alignment hole in the main body case, 18a ... Core alignment part of spring adjuster, 19 ... Pin insertion hole of spring adjuster, 1
a · 25a: fixed part of centrifugal governor, 37: receiving part of governor lever, G: centrifugal governor, GF: governor force, SF: spring force, 4/4: full load position, Tu: torque up position, R ... fuel increase side, L ... fuel decrease side.

Continuation of the front page (56) References JP-A-6-241069 (JP, A) JP-A-60-10840 (JP, A) JP-A-54-134224 (JP, A) JP-A-61-155644 (JP) , U) Fully open 1986-613843 (JP, U) Fully open 1988-115540 (JP, U) Fully open 1987-556036 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB (Name) F02D 1/02 321 F02D 1/04

Claims (2)

(57) [Claims] A governor lever (1) of a centrifugal governor (G) is urged toward a fuel increasing side (R) by a spring force (SF) of a governor spring (8), and an input part (4) of the governor lever (1). Is biased to the fuel reduction side (L) by the governor force (GF), and the output part (5) of the governor lever (1) is linked to the fuel metering tool (9) of the fuel injection pump (6), and the governor lever ( 1) is configured to be swingable by the unbalance force between the governor force (GF) and the spring force (SF), and the fuel restrictor (10) is mounted on the centrifugal governor.
(G) fixed to the fixed portion (25a1a), the fuel restrictor (10) is fixed to the fixed portion (25a Base end (1
2b) is housed in the main body case (11), and its tip (12
a) projecting from the front end side of the main body case (11) so as to be able to advance and retreat, and a torque pin (12) facing the receiving portion (37) formed on the governor lever (1) so as to be able to elastically contact therewith; And a helical torque spring (13) that resiliently receives the torque pin (12) and the body case
(11) A spring adjuster (14) which is screwed forward and backward from behind to adjust the resilience of the torque spring (13), and is provided so as to be able to advance and retreat through the spring adjuster (14). and was restriction pin (15), provided retractably in the rear portion of the body case (11)
Is, the via the regulating pin (15) the torque pin (12)
Made by including withdrawal Iriryou (t) of the metering can regulate pin metering device and (16), the overload operation state, the torque pins (1
2) can move back and forth to the catch (37) of the governor lever (1).
By pressing those, the governor lever (1) is swung between the full load position (4/4) and torque up position (Tu)
In the fuel limiting device for a diesel engine configured as described above, the main body case (11) has a centering hole (17) connected to a tip end side of a screw hole (17) for screwing the spring adjuster (14) forward and backward. The spring adjuster ( 14 ) is provided with a centering portion that fits loosely with the centering hole (18) at the distal end of a screw portion (17a) that is screwed into the screw hole (17). (18a) The fuel limiting device for a diesel engine, wherein the torque spring (13) is externally fitted to the regulating pin (15) with a play gap. 2. The pin adjusting device (16) is provided with the spring adjusting device.
The fuel limiting device for a diesel engine according to claim 1, wherein the fuel limiting device is configured to be screwed from behind into a pin insertion hole (14a) formed in the (14) and to receive the restriction pin (15) .