JP3323363B2 - Centrifugal governor torque-up device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal governor torque-up device.

[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 exhibit low speed and high torque in an overload operation state, a fuel injection amount in a low speed range is reduced to a level that does not cause incomplete combustion. In addition to increasing the engine toughness, the fuel injection amount is not increased in the lower unused rotational speed range so as not to cause incomplete combustion. For this purpose, a torque increase device is attached to a centrifugal governor of a diesel engine to control the fuel injection amount in a low speed range.

[0003] As a centrifugal governor provided with the above-mentioned torque-up device, for example, one disclosed in Japanese Utility Model Application Laid-Open No. 61-138844 is known. It is shown in FIG.
The governor lever 1 of the centrifugal governor G is connected to the governor spring 8
, The input portion 4 of the governor lever 1 is urged to the fuel decreasing side L with the governor force GF, and the output portion 5 of the governor lever 1 is controlled by the fuel metering rack of the fuel injection pump 6. 9, the governor lever 1 is configured to be swingable with an unbalanced force between the governor force GF and the spring force SF, and the torque-up device 10 is mounted on the centrifugal governor G.
The governor wall 25 or the two-lever governor is fixed to one governor lever (hereinafter, referred to as a fixed portion).

As the torque-up device, as shown in FIG. 6, a main body case 11 fixed to the fixed portion 25 so as to be able to move forward and backward, and a base end portion thereof are housed in the main body case 11, The tip is the main body case 11
The torque pin 1 protrudes from the front end side of the shaft 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.
2, a torque spring 13 housed in the main body case 11 and resiliently biasing the torque pin 12;
It is screwed into the main body case 11 so as to be able to advance and retreat from behind,
A pin adjuster 16 for receiving the torque spring 13 and adjusting the retreat gap t of the torque pin 12
And a lock nut 21 for urging and fixing the pin adjusting tool 16 backward.

The torque-up device 10 restricts the governor lever 1 from swinging to the full load position (4/4) by the torque pin 12 and increases the fuel amount of the governor lever 1 from the full load position (4/4) by the torque spring 13. The swing is restricted to the torque-up position (Tu) on the side (R). In other words, d
When the engine is overloaded, the governor lever 1 is in the full load position.
When the shift to the fuel increasing side R exceeds (4/4),
The governor lever 1 is torque-up to the limit of the insertion gap t.
The swing of the engine is restricted to the position Tu and the engine load is adjusted to the full load position (4
/ 4), the fuel injection amount in the low speed range is increased to such an extent that incomplete combustion does not occur, thereby exhibiting the engine's tenacity. In the lower unused speed range, incomplete combustion due to fuel increase is performed. The fuel is restricted so that it does not occur.

[0006] However, in the above prior art, the pin meter 1
6 receives the torque spring 13 and adjusts the retreat gap t of the torque pin 12 by the pin adjusting tool 16. Therefore, if the retreat gap t is to be adjusted accurately, the initial spring pressure of the torque spring 13 is reduced. Goes crazy. That is, the retreat gap t of the torque pin 12 and the torque spring 1
The initial spring pressure of No. 3 cannot be set individually. Therefore, in order to solve the above-mentioned inconvenience, prior to the present invention, a torque-up device shown in FIG. 5 (Japanese Patent Application No. 6-280782).
No., hereinafter referred to as prior invention examples).

The prior art example (FIG. 5) is different from the prior art example (FIG. 6) in that the screw is screwed into the main body case 11 from the rear and receives the rear end of the torque spring 13 at a predetermined position B to define the initial spring pressure. A receiving pin 14 and a transmission pin 15 which is inserted through the center guide hole 14a of the spring receiving element 14 and is provided with a retreat gap t between the torque pin 12 and the pin adjusting tool 16 so as to be able to advance and retreat. , And
The retreat gap t of the torque pin 12 and the initial spring pressure of the torque spring 13 can be set individually.

In this prior invention, the retraction gap t of the torque pin 12 is set by the pin adjusting device 16, and then the pin adjusting device 16 is urged backward by the lock nut 21 to be fixed. There is a risk of going crazy in the direction in which the entry gap t increases. Because the pin weighing device 16 is
Starting from the state of light contact with the screw 5, the pin adjusting tool 16 is unscrewed by a predetermined rotation angle to set the retreat gap t of the torque pin 12. In this setting state, the play gap δ of the screw threaded portion is It should be located before and after the thread of the metering tool 16.

However, in a state where the pin adjusting tool 16 is urged rearward by the lock nut 21 and fixed, as shown in an enlarged view A of the main part of FIG.
Is located in front of the screw thread of the pin adjusting tool 16, and the retreat gap t of the torque pin 12 is 1 / one of the play gap δ.
It goes crazy in the direction of increasing by two. In addition, after the retraction gap t of the torque pin 12 is set, when the screw portion of the main body case 11 and the pin adjustment tool 16 is crimped from the rear to fix the pin adjustment tool 16, on the other hand, when the pin adjustment tool 16 is fixed. Insertion gap t
Is deviated in a direction to reduce by half the play gap δ.

Further, since the spring receiving member 14 is screwed into the main body case 11 from the rear to receive the rear end of the torque spring 13 at a predetermined position B, if the screw portion becomes loose due to engine vibration or the like. Therefore, the receiving position of the torque spring 13 may be shifted. Further, the threading of the spring receiver 14 itself is required, and the body case 11
Since the internal screw holes are also deep, the cost of the torque-up device 10 increases. In addition, when burrs are formed in the screw groove 14b of the spring receiving member 14, the smooth movement of the transmission pin 15 is hindered.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has an object to separately set a retreat gap of a torque pin and an initial spring pressure of a torque spring. When fixing the pin metering tool after setting the retraction gap for the torque pin, make sure that the retraction gap does not deviate, and that the receiving position of the torque spring does not shift due to engine vibration, etc. It is an object of the present invention to eliminate the necessity of threading the spring receiver, to make the screw hole in the main body case shallow, and to ensure smooth movement of the transmission pin 15.

[0012]

In order to achieve the above object, the present invention is configured as follows. That is, claim 1
The invention described in the above in the torque-up device of a conventional centrifugal governor, respectively provided in the main body casing 11, slidably from the rear into the main body case 11
Inserted and positioned at a predetermined position B which is the end of the insertion hole 18
Is determined, the rear end of the torque spring 13 and the spring receiving member 14 which defines the initial spring pressure received by the predetermined position B, and a state in which through the center guide hole 14a of the spring receiving member 14, the torque pins 12 And pin weighing tool 16
Is interposed between the retracted gap transmission pin 15 a is movably interposed provided t the torque pin 12, and the spring receiving member 14 and the pin metering device 16 between, the torque spring
13 with a pressing force stronger than the resilience of the spring 13
4 and a biasing spring 17 that biases the pin metering tool 16 rearward while urging the pin 4 forward .
The spring receiving member 14 is moved to the predetermined position B by the urging spring 17.
In addition to positioning, the pin
It is characterized in that the retreat gap t is adjusted via the reference numeral 15 .

[0013]

[0014]

According to the first aspect of the present invention, the spring receiving member 14 receives the rear end of the torque spring 13 at the predetermined position B and regulates the initial spring pressure of the torque spring 13.
The transmission pin 15 is inserted through the center guide hole 14a of the spring receiving member 14 so as to be able to move forward and backward. The transmission pin 15 is interposed between the torque pin 12 and the pin adjustment member 16, and the pin adjustment member is provided. The retreat gap t of the torque pin 12 is independently set by adjusting the forward / backward movement of the torque pin 16. An urging spring 17 interposed between the spring receiving member 14 and the pin adjusting member 16 urges the pin adjusting member 16 backward and elastically. That is, the same state as when the pin weighing tool 16 is urged backward and fixed by the weighing tool fixing means 21 is maintained. Therefore,
The play gap δ of the screw engagement portion in the main body case 11 is not located before or after the screw thread of the pin adjusting tool 16.

According to the first aspect of the present invention, the spring receiving member 14 is slidably inserted into the main body case 11 from the rear, but is set to a pressing urging force stronger than the elastic force of the torque spring 13. Since the urging spring 17 is pressed and urged forward, it is correctly positioned at the predetermined position B which is the end of the insertion hole 18 without being screwed into the main body case 11. In addition, since the spring receiving member 14 does not need to be screwed into the main body case 11, no threading or screwing groove portion of the spring receiving member 14 is required, and a deep screw hole in the main body case 11 is unnecessary.

[0016]

According to the first aspect of the present invention, the following effects can be obtained by the above configuration. Spring holder with urging spring
It is positioned at a predetermined position at the end of the insertion hole to define the initial spring pressure of the torque spring, and the transmission pin is adjusted with a pin adjuster.
Since adjusting the retracted gap torque pin through the emission, Torr
The retreat gap of the torque pin can be set independently without changing the spring pressure of the spring . By pressing the pin weighing tool backward and elastically with the biasing spring, the same state as when the pin weighing tool is urged backward and fixed by the weighing tool fixing means is maintained, so the torque pin retraction gap is set. After that, the deviation gap does not change.

According to the first aspect of the present invention, the spring receiving member is urged forward by the urging spring set to a pressing urging force stronger than the elastic force of the torque spring, and is correctly positioned at the predetermined position. Since the positioning is performed, the receiving position of the torque spring does not shift due to the vibration of the engine or the like. Since the spring receiver does not need to be screwed into the main body case, there is no need for threading the spring receiver or a groove for screwing in, and the screw hole in the main body case can be made shallow, and the burrs in the screw groove can be reduced. Since there is no problem, the smooth movement of the transmission pin can be ensured.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a torque increasing device showing a first embodiment according to the present invention, and FIG. 3 is a perspective view of a centrifugal governor showing an application example of the torque increasing device. First, the arrangement of the torque-up device will be described with reference to FIG. As shown in FIG. 3, the governor lever 1 pivotally supports the outer arm 1 a and the inner arm 1 b so as to be able to swing integrally with a pivot shaft 23, and moves the inner arm 1 a and the inner arm 1 b in a fuel injection pump chamber (hereinafter referred to as a pump chamber). Placed adjacent outside,
Governor weight 2 of centrifugal governor G in the lower part of the pump room
The governor weight 2 is connected to the input portion of the inner arm 1b via the governor sleeve 3, and the fork-shaped output portion 5 of the inner arm 1b is engaged with the metering rack pin 9 of the fuel injection pump.

The governing lever 22 is pivotally supported by a side wall of the pump chamber around a pivot 26 so that the outer arm 1a of the governor lever 1 is connected to the governing lever 22 via a governor spring 8. The governor lever 1 is configured to be swingable by an unbalanced force between the governor force GF of the governor weight 2 and the spring force SF of the governor spring 8. As shown in FIGS. 1 and 3, a rectangular flat receiving portion 37 is formed on the outer arm 1 a of the governor lever 1, and the torque-up device 10 is screwed into a side wall (hereinafter, referred to as a fixed wall) 25 of the pump chamber. In this case, the distal end portion 12a of the torque pin 12 faces the receiving portion 37 so as to be able to elastically contact with the receiving portion 37 from behind, and the governor lever 1 is configured so that the torque pin 12 can restrict swinging to the full load position (4/4). Reference numeral 20 in FIG. 1 denotes a lock nut that positions and holds the torque-up device 10 on the fixed wall 25.

As shown in FIG. 1, the torque-up device 10 has the same basic structure as that of the above-mentioned prior art example (FIG. 5). That is, the main body case 11 is fixed to a fixed wall 25 as a fixed portion so as to be able to advance and retreat freely,
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.
Face to be able to contact. The helical torque spring 13 is housed in the main body case 11 and urges the torque pin 12 forwardly.

Hereinafter, the torque-up device 1 according to the first embodiment will be described.
0 will be described. The torque-up device 10 includes a spring receiving member 14, which will be described in detail below,
It has a transmission pin 15 and an urging spring 17 interposed between the spring receiving member 14 and the pin adjusting member 16. The spring receiving member 14 is slidably inserted into the main body case 11 from the rear, and is received at an end B (hereinafter, referred to as a predetermined position) of an insertion hole 18 of the spring receiving member 14. That is, since the spring receiving member 14 does not need to be screwed into the main body case 11, threading and a threaded groove portion of the spring receiving member 14 are unnecessary, and a deep screw hole in the main body case 11 is unnecessary.

The transmission pin 15 is connected to the spring receiving member 14.
In a state penetrating through the center guide hole 14a, a retreat gap t of the torque pin 12 is provided between the torque pin 12 and the pin adjusting tool 16 so that the torque pin 12 can be moved forward and backward freely. It is configured such that it can be independently adjusted by the pin adjusting tool 16 in accordance with Tu. As described above, the burrs in the groove for screwing the spring receiving member 14 do not cause a problem, so that the smooth movement of the transmission pin 15 can be ensured.

The urging spring 17 interposed between the spring receiving member 14 and the pin adjusting member 16 is set to have a pressing urging force stronger than the resilient force of the torque spring 13. The pressure spring 14 is pressed forward to receive the rear end of the torque spring 13 at the above-mentioned predetermined position B so as to be positioned correctly, thereby defining the initial spring pressure of the torque spring 13. As a result, there is no possibility that the receiving position of the torque spring 13 is shifted due to engine vibration or the like. Incidentally, in the present embodiment, the initial spring pressure of the torque spring 13 is set to zero (natural length). Further, from the viewpoint of improving the productivity, the urging spring 17 and the torque spring 13 are selectively used by using the same spring.

The urging spring 17 is connected to the pin adjusting tool 16.
Is pressed backwards. On the other hand, the pin meter 1
6 is fixed by adjusting means fixing means such as lock paint after adjusting the retreat gap t of the torque pin 12. In other words, the pin adjusting tool 16 is urged backward by the urging spring 17 so that the pin adjusting tool 16 is pressed by the adjusting tool fixing means.
Is maintained in the same state as when it is biased backward and fixed. Therefore, when the pin adjusting tool 16 is fixed after the retreat gap t of the torque pin 13 is set, the retreat gap t does not become out of order.

FIG. 2 is a longitudinal sectional view of a torque increasing device showing a second embodiment according to the present invention. In the second embodiment,
After adjusting the retreat gap t of the torque pin 12, the pin adjuster 16 is fixed to the rear part of the main body case 11 with the lock nut 21. Other points are the same as those of the first embodiment. Therefore, the second embodiment also functions in the same manner as the first embodiment (FIG. 1), and the retraction gap t of the torque pin 13 does not become out of order.

According to the torque-up device 10, the governor lever 1 is in the full load position (4
/ 4) (see FIGS. 1 and 3), the receiving portion 37 of the outer arm 1a of the governor lever 1 comes into contact with the torque pin 12. When the governor force GF weakens in the overload operation state 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
Urges the torque pin 12 rearward, so that 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 swings to the torque-up position (Tu), the retreat of the transmission pin 15 is regulated by the pin adjusting tool 16, and the retreat amount t of the torque pin 12 is regulated. This restricts the governor lever 1 to the torque-up position (Tu).

That is, as the engine speed decreases due to the overload operation, the governor lever 1 moves to the full load position (4
/ 4) to the fuel increasing side (R), and the governor lever 1
After the receiving portion 37 abuts on the torque pin 12, the torque pin 12 is fixed to the torque spring 1 until the torque pin 12 is regulated by the pin adjusting tool 16 via the transmission pin 15.
3 against the resilience. Between the full load position (4/4) and the torque-up position (Tu), low speed and high torque characteristics are exhibited, and the engine exhibits tenacity. On the other hand, since the governor lever 1 is restricted from swinging at the torque-up position (Tu), the fuel is not excessively injected beyond the torque-up position (Tu).

FIG. 4 shows a torque-up device 10 according to the present invention.
Another embodiment in which is applied to a two-lever governor G is shown.
In this embodiment, the main body case 11 of the torque up 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 distal 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 fixed wall 25, and faces the second receiving portion 38 formed on the second governor lever 1b so as to be able to come into contact therewith.

The resilience of the torque spring 13 of the torque-up device 10 is set to a value weaker than that of the governor spring 8, and when the engine is in a no-load operation state (0/4) to a full-load operation state (4/4). Is the second governor lever 1
In a state in which the receiving portion 37b of the fuel torque pin 10 fully pushes the torque pin 12 of the fuel torque pin 10, the first governor lever 1a and the second governor lever 1 are balanced with the tension of the governor spring 8 and the start spring 33 and the governor force GF.
b swings together.

When the first governor lever 1a is in the full load position (4 /
When the process proceeds to 4), the second receiving portion 38 of the second governor lever 1b contacts the stopper 32. When the engine is overloaded and the governor force GF further decreases, the torque spring 13 of the fuel torque pin 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 protrusion amount t, the first governor lever 1a is pushed. 1a is a torque-up position (T
rock until 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),
Between the full load position (4/4) and the torque-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 longitudinal sectional view of a main part of a torque-up device according to a first embodiment.

FIG. 2 is a view corresponding to FIG. 1 showing a second embodiment.

FIG. 3 is a perspective view of a centrifugal governor showing an application example of the torque up device according to the present invention.

FIG. 4 is a schematic view of a two-lever governor showing an application example of the torque-up device according to the present invention.

FIG. 5 is a diagram corresponding to FIG. 1 showing a prior invention example.

FIG. 6 is a longitudinal sectional view of a main part of a torque-up device 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 ... torque increasing device, 11: body case, 12: torque pin, 12a: distal end of torque pin, 12b: base end of torque pin, 13: torque spring, 14: spring receiving member, 14a: center guide hole of spring receiving member, 15: transmission pin, Reference numeral 16: Pin adjusting device, 17: biasing spring, 1a / 25: fixed portion of centrifugal governor, 21
..., 37 ... receiving part of governor lever, B ... predetermined position,
t: retraction gap of torque pin, G: centrifugal governor, GF ...
Governor force, SF: Spring force, 4/4: Full load position,
Tu: torque increase position, R: fuel increasing side, L: fuel decreasing side.

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02D 1/04 F02D 31/00 301

Claims (1)

(57) [Claims] 1. A governor lever (1) of a centrifugal governor (G) is pushed by a spring force (S) of a governor spring (8).
F) to urge the fuel increase side (R), and the governor lever (1)
Input part (4) of the fuel loss side (L) with governor force (GF)
And the output portion (5) of the governor lever (1) is operatively connected to the fuel metering device (9) of the fuel injection pump, and the governor lever (1) is connected to the governor force (GF) and the spring force (S).
F) and the torque-up device (10) is fixed to the fixed portion (25) of the centrifugal governor (G).
1a), and the torque-up device (10) is fixed to the fixed portion (25)
・ A main body case (1) fixed to 1a)
1) and the base end (12b) of the main body case (1).
A torque pin (1) is housed in the torque pin (12a), and its distal end (12a) protrudes from the distal end side of the main body case (11) so as to freely advance and retreat, and faces the receiving portion (37) formed on the governor lever (1) so as to be able to elastically contact. 12) and the main body case (1)
A torque spring (13) housed in the housing (1) and resiliently biasing the torque pin (12), and screwed into the main body case (11) so as to be able to advance and retreat from the rear; retracted clearance (t) of the metering can regulate pin metering device (16), made by including the pin metering device (16) fixed to the metering device fixing means (21), the engine overload During operation, the governor lever (1) moves to the fuel increasing side (R) beyond the full load position (4/4).
Then, in the torque-up device of the centrifugal governor configured to <br/> to swing restricting the retracted gap the governor lever (t) to limit (1) to the torque-up position (Tu), respectively the body case (11) and slidably inserted from the rear into the main body case (11).
(B) at the end of the insertion hole (18)
Is positioned, the spring receptacle defining the initial spring pressure of the rear end of the torque spring (13) received by said predetermined position (B) and (14), the central guide hole of the spring receptacle (14) ( 14a), a transmission pin (15) interposed between the torque pin (12) and the pin adjusting tool (16) so as to be capable of moving forward and backward by providing the retreat gap (t) between the torque pin (12) and the pin adjusting tool (16); It is interposed between the receiving device (14) and the pin adjusting device (16), and is provided by the elastic force of the torque spring (13).
The spring receiver (14) forward with a strong pressing force.
And an urging spring (17) for urging the pin metering tool (16) backward and elastically while urging the pin adjuster (16) backward. The urging spring (17) sets the spring receiving member (14) to the predetermined position.
Positioning at the position (B) and the pin weighing device
In (16), the above-mentioned retreat gap is formed via the transmission pin (15).
A torque-up device for a centrifugal governor , which is configured to adjust (t) .