JP2524146B2 - Ores speed governor of diesel engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application) The present invention relates to a governor lever having one end connected to a control rack and the other end facing a governor output part to receive a governor output, and a governor lever having one end pulled. The present invention relates to an all-speed governor for a diesel engine that has a tension lever or the like that is connected to and biased toward the fuel increase side.

(Prior Art) In a governor of a diesel engine, complicated fuel injection characteristics have been required due to the necessity of increasing the output of the engine and measures for exhaust gas. For example, while increasing the output, it is required to increase the fuel injection amount in the high speed rotation range, while reducing the fuel when moving from the high speed rotation range to the low speed rotation range so that black smoke is not generated in the low speed rotation range. Is required.

In response to such demands, for example, taking heavy measures against black smoke,
If the fuel injection amount is totally lowered by the adapter function or the like, it is not possible to cope with the high output in the high speed rotation range, while if the fuel injection amount is entirely raised, the black smoke countermeasure becomes insufficient.

As a governor satisfying both the high output of the engine and the exhaust gas countermeasure, a governor of a type different from the all speed governor, for example, a governor such as JP-A-48-18631 has been developed, but a link mechanism or the like has been developed. Complex and extremely difficult to apply to all speed governors.

Further, as other conventional techniques, there are JP-A-59-156129 and JP-A-59-170646.

In the former, a starting spring for increasing the amount of starting fuel and an Angleich spring are contracted between the tension lever and the governor lever, and the action of each spring exerts the fuel injection characteristics as shown in FIG. There is. That is, in FIG.
The starting spring secures an increase in starting fuel as shown in the section ab, while the Angleich spring secures an increase in fuel in the torque rise section with respect to the fuel injection amount Ra at the rated speed as shown in section cde. are doing. The section cd is the section where the set pressure of the Angleich spring is operating,
de is the section in which the Angreich spring is expanding and contracting.

However, in this characteristic, as described above, particularly when the high speed rotation range is rapidly changed to the low speed rotation range, excess fuel is generated in the low speed rotation range (near cd), and black smoke is generated.

The latter governor also has a similar structure and similarly produces black smoke.

(Object of the Invention) In an all-speed governor, the fuel injection amount can be increased in the high speed rotation range to achieve high output, and the fuel injection is performed in the low speed rotation range when shifting from the high speed rotation range to the low speed rotation range. The purpose is to reduce the amount and prevent the generation of black smoke.

(Technical means for achieving the purpose) A tension lever shaft and a governor lever shaft arranged between the fuel increase / decrease control rack and the governor output section,
A governor lever that is rotatably supported by the governor lever shaft, one end of which is connected to the control rack, and the other end of which is opposite to the governor output unit and receives the governor output. Part is connected to a tension governor spring and urged toward the fuel increase side, and one end is rotatably supported by the governor lever shaft and the other end is attached to the other end of the tension lever by the Angleich lever shaft. An Angleich lever pivotally supported via, and the other end of the governor lever is located between the Angleich lever and the governor output section, and the tension lever is provided on the side opposite to the governor lever output section side of the Angleich lever. A stopper part that forms a part is arranged, and a starting spring for increasing the starting amount and a reverse angulation stronger than the starting spring are provided in the Angleich lever. A first spring for the ich and a second spring for the Angreich, which is stronger than the first spring, are arranged, and these starting springs are arranged so as to secure a gap for increasing the starting amount between the Angleich lever and the governor lever. The first spring is compressibly interposed between the levers, the first spring is compressibly interposed between the Angleich lever and the tension lever so as to secure a gap for the reverse Angleich, and the second spring is The starter spring is interposed between the lever and the governor lever so as to come into contact with and compress the governor lever after being compressed for a certain distance.

(Embodiment) FIG. 1 shows a state before starting of an all-speed governor to which the present invention is applied. In FIG. 1, a governor case 1 is fixed to a front wall of a fuel injection pump case 2,
The cam shaft 3 projects from the fuel injection pump case 2, and the fuel increase / decrease control rack 25 of the fuel injection pump 28 projects above the cam shaft 3. Holder 8 for cam shaft 3
Further, the governor weight 7 is supported by the support shaft 9 so as to be expandable, and the governor thruster 6 is fitted to the front end portion of the cam shaft 3 so as to be movable in the axial direction (front-back direction). The governor thruster 6 is pushed forward by the expanding operation of the governor weight 7 by the centrifugal force.

A tension lever shaft 13 which is perpendicular to the cam shaft 3 is arranged above the thruster 6 and is supported by the governor case 1.
Is rotatably supported.

The upper arm of the tension lever 14 extends rearward and upward, and thereafter a governor spring 15 for determining the maximum rotation speed is stretched between the upper end portion and the front control lever 18, whereby the tension lever 14 is moved to the fuel increase side. I am biased. The control lever 18 is fixed to a control shaft 21, and the control shaft 21 is rotatably supported by the governor case 1 and is rotatably operated from the outside. A limiter stopper surface 14b is formed at the upper front end of the tension lever 14, and the stopper surface 14b is in contact with the rod portion of the fuel limiter 53. A connecting plate / stopper plate 14a is integrally formed at the front end of the lower arm of the tension lever 14 below the tension lever shaft 13, and an adjusting bolt 42 protruding slightly rearward is screwed into the stopper plate 14a. However, it is fixed by the nut 43.

A governor lever shaft 19 parallel to the tension lever shaft 13 is arranged slightly above the tension lever shaft 13, and a governor lever 22 is rotatably supported on the governor lever shaft 19. The governor lever 22 extends in both up and down directions, and the upper end portion of the upper arm portion is pivotally connected to the front end portion of the control rack 25. The lower arm portion of the governor lever 22 extends so as to pass in front of the thruster 6 and is integrally provided with a force receiving pin 29 that comes into contact with the front end surface of the thruster 6.

An Angleich lever 31 is disposed between the stopper plate 14a of the tension lever 14 and the governor lever 22, and the lower end of the Angleich lever 31 is connected to the tension lever shaft 30 parallel to the tension lever shaft 14 by the tension lever 14 parallel to the tension lever 14. The lower end is pivotally connected, and the upper end of the Angleich lever 31 is pivotally connected to the governor lever shaft 19.

The Angleich lever 31 is formed with a bottomed first hole 34, a second hole 35 and a bottomed start-up increasing hole 36 located below the tension lever shaft 13 in this order from the top. A front opening is opened, a rear opening-shaped spring case 44 is screwed into the second hole 35, and the starting amount increasing hole 36 is opened rearward. A rear protruding starter spring 51 is arranged in the starting amount increasing hole 36, and is compressed with a predetermined initial load between the governor lever 22 and the bottom of the hole 36,
As a result, a gap (l1 + l3) is secured between the rear end surface of the Angleich lever 31 and the front end surface of the governor lever 22.

The first rod 39 is inserted into the first hole 34 so as to be movable in the front-rear direction, and the front end spring bearing head 39a of the first rod 39 and the first hole 34 are inserted.
The first spring 41 for reverse Angleich is contracted between the first spring 41 and the bottom of the. As the first spring 41, one having a stronger spring force than the starting spring 51 is used. The first rod head 39a is the bolt 42 of the stopper plate 14a of the tension lever 14.
, Thereby securing a gap l2 between the front end surface of the Angleich lever 31 and the stopper plate 14a.

A second rod 45 is inserted in the spring case 44 of the second hole 35 so as to be movable in the front-rear direction, and a second rod 45 is provided between the rear end spring receiving head portion 45a of the second rod 45 and the bottom portion of the spring case 44 for Angleich. The second spring 46 is contracted. As the second spring 46, one having a stronger spring force than the first spring 41 is used. The head 45a of the second rod 45 is the Angleich lever 3
1 is locked by the front end locking ring 40 in a state of protruding from the rear end surface by a gap l3, whereby the second rod head
45a opposes the governor lever 22 across a gap l1.
The size relationship between the gaps l1, l2 and 3 is l2 ≦ l1 <l3.

In FIG. 2, the tension lever 14 is formed in a shape in which a pair of left and right plate members are connected by the stopper plate 14a, and an Angleich lever 31 is arranged between both plate members.

Next, the operation of the governor as the rotation speed increases will be described.

(1) FIG. 3 shows a state before the engine is started. The governor lever 22 is separated by the starting spring 51 from the second rod head portion 45a by a distance of l1 to secure the increased starting amount.

(2) Rotate the control lever 18 forward by the maximum amount,
When the engine is started in the state where the load of the governor spring 15 is maximized, that is, in the so-called full throttle state, the state shown in FIG. 3 is maintained until the governor force F reaches the initial load of the starting spring 51 immediately after the start, and the starting amount is increased. Is secured. It is the section N0 to N1 in FIG.

(3) When the governor force F in FIG. 3 exceeds the initial load of the starting spring 51, the governor lever 22 compresses the starting spring 51,
The gap l1 moves and comes into contact with the second rod head portion 45a. During this time, the governor lever 22 rotates in the direction of arrow A around the governor lever shaft 19, whereby the control rack 25 moves to the fuel reducing side, and the increase in starting amount is released. Section N1 to N2 in Fig. 7
Is.

(4) As shown in FIG. 4, the governor lever 22 is the second rod head.
The state shown in FIG. 4 is maintained and the fuel injection amount does not change until the governor force F overcomes the first spring 41 in the state of being in contact with 45a (l1 = 0). It is the section N2 to N3 in FIG.

(5) When the governor force F shown in FIG. 4 overcomes the first reverse Angleich spring 41, the first spring 41 is compressed and the stopper plate 14a of the tension lever 14 and the Angleich lever 3 are compressed.
1 and abut (l2 = 0). During this time, the governor lever 22 and the Angleich lever 31 are integrated with the Angleich lever shaft.
Rotate around 30 in the direction of arrow B in FIG. 4 to move the control rack 25 to the fuel increase side. It is the section N3 to N4 in FIG.

(6) As shown in FIG. 5, the stopper plate 14a of the tension lever 14 and the Angleich lever 31 come into contact with each other (l1 = 0, l
After 2 = 0), until the governor force F overcomes the second spring 46, the state of FIG. 5 is maintained and the fuel injection amount does not change. It is the section N4 to N5 in FIG. 7, and maximum torque can be exerted in this section.

(7) The governor force F in Fig. 5 is the second for Angleich.
When the spring 46 is overcome, the second spring 46 is compressed and, after the governor lever 22 moves the gap l3, the governor lever 22 and the Angleich lever 31 come into contact with each other (l3 = 0). During this time, the governor lever 22 rotates around the governor lever shaft 19 in the direction of arrow A in FIG. 5 to move the control rack 25 to the fuel reducing side. It is the section N5 to N6 in FIG. (8) As shown in FIG. 6, the three levers 14, 22, 31 are integrated (l1 = 0, l2 = 0, l3
= 0), the governor lever 22 will move to the tension lever 14
Also, the control rack 25 is rotated around the tension lever shaft 13 against the governor spring 15 together with the Angleich lever 31 to move the control rack 25 to the fuel reduction side. It is a section of N6 or more in FIG.

(Effects of the Invention) As described above, the present invention includes the tension lever shaft 13 and the governor lever shaft 19 arranged between the fuel increase / decrease control rack 25 and the governor output portion (thruster 6).
A governor lever 22 is rotatably supported by the governor lever shaft 19, one end of which is connected to the control rack 25, and the other end of which is rotatably supported by a governor lever 22 facing the governor output part and receiving a governor output. The tension lever 14 has one end connected to the tension governor spring 15 and biased toward the fuel increase side, and the other end has a governor lever shaft 19
The other end of the tension lever 14 is rotatably supported, and the other end of the tension lever 14 is provided with an Angleich lever 31 pivotally supported via an Angleich lever shaft 30, and the Angleich lever 31 and the governor output section. The other end of the governor lever 22 is positioned in between, and a stopper portion (stopper plate 14a) forming a part of the tension lever 14 is arranged on the side opposite to the governor lever output portion side of the Angleich lever 31. The starting spring 35 for increasing the starting amount and the starting spring 35
A first spring 41 for reverse Angleich stronger than the first spring, and a second spring 46 for Angleich stronger than the first spring 41,
The starting spring 35 is compressibly interposed between the Angleich lever 31 and the governor lever 22 so as to secure a clearance for increasing the starting amount between the Angleich lever 31 and the governor lever 22, and the first spring 41 serves as the Angleich lever 31. And tension lever 14 so that there is a gap for reverse Angleich.
A second spring 46 is interposed between the Angleich lever 31 and the governor lever 22 so that the second spring 46 abuts against the governor lever 22 and compresses after the starting spring 35 has compressed a certain distance. Since it is inserted between 22 units, it has the following effects.

(1) In the all speed governor, due to the action of the second spring 46 for Angreich, as shown in the section N4 to N5 in FIG. 7, sufficient fuel is secured in the high speed rotation range where the maximum torque is generated, On the other hand, as shown in the sections N4 to N3 and N3 to N2, for example, when shifting from the high speed rotation range to the low speed rotation range, the fuel injection amount is reduced in the low speed rotation range to achieve high output. It prevents the occurrence.

In addition, the start spring 35 for increasing the starting fuel amount allows the section N0
As shown by ~ N1, the starting fuel amount is increased and the starting performance is also improved.

(2) The Angleich lever 31 is pivotally connected to the governor lever shaft 19 and the Angleich lever shaft 30 at the other end of the tension lever 14, and inside the Angleich lever 31.
Since the starting spring 35, the reverse first spring 41 for Angleich and the second spring 46 for Angleich are all housed,
The assembly of 35, 41, 46 is easy and the lever structure is compact.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of an all-speed governor to which the present invention is applied, FIG. 2 is a view taken in the direction of arrow II in FIG. 1, and FIGS. 3 to 6 are views at each stage when the engine speed is increased. FIG. 7 is a schematic side view showing the change in rotation of the lever in sequence, FIG. 7 is a fuel injection amount characteristic diagram when the present invention is adopted, and FIG. 8 is a fuel injection amount characteristic diagram of the prior art. 13 …… tension lever shaft, 14… tension lever, 15 …… governor spring, 19 …… governor lever shaft, 22 …… governor lever, 25 …… fuel increase / decrease control rack, 29 …… force receiving pin (power receiving part), 30 ...... Angreich lever shaft, 31 ...... Angerich lever, 41 ...... First spring for reverse Angleich, 46 ...... Second spring for Angleich

Claims (1)

(57) [Claims] 1. A tension lever shaft and a governor lever shaft arranged between a fuel increasing / decreasing control rack and a governor output part, and one end connected to the control rack and rotatably supported by the governor lever shaft. Is a governor lever that faces the governor output section and receives the governor output, and a tension lever that is rotatably supported by a tension lever shaft and has one end connected to a tension governor spring and biased toward the fuel increase side. The other part is rotatably supported by the governor lever shaft, and the other end is provided at the other end of the tension lever with an Angleich lever pivotally supported via the Angleich lever shaft, and the Angleich lever and the governor output part are provided. Position the other end of the governor lever between,
A stopper part that forms a part of the tension lever is arranged on the side opposite to the governor lever output part side of the Angleich lever, and a starting spring for increasing the starting amount and a reverse Angleich stronger than the starting spring are provided in the Angleich lever. A first spring and a second spring for Angreich stronger than the first spring are arranged, and the starting spring is arranged between the Angleich lever and the governor lever so as to secure a clearance for increasing the starting amount between the levers. The first spring is compressibly interposed between the Angleich lever and the tension lever so as to secure a gap for the reverse Angleich, and the second spring is interposed between the Angleich lever and the tension lever. Between the governor levers, the starting spring is interposed between the levers so as to abut and compress the governor levers after they have been compressed for a certain distance. All speed governor of the diesel engine to be.