JP3074512B2 - Diesel engine start-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 an apparatus for increasing the amount of starting of a diesel engine, which eliminates mistakes in starting in cold weather and promotes warm-up operation.

[0002]

BACKGROUND OF THE INVENTION As shown in FIG. 4 or FIG. 6, the basic structure of a diesel engine starting and increasing device to which the present invention is applied is such that a governor lever 1 is supported by a diesel engine E,
The governor lever 1 is composed of two levers, a weight-side lever 1a and a spring-side lever 1b, and the governor weight 2 of the centrifugal governor G is used as an input part 3 of the weight-side lever 1a.
In addition, the output portion 4 of the weight side lever 1a is interlocked with the metering rack 6 of the fuel injection pump 5, and the weight side lever 1a
Governor spring 7 via spring side lever 1b
And the weight side lever 1a is configured to be swingable by an unbalance force between the governor force GF of the governor weight 2 and the spring force SF of the governor spring 7,
The spring-side lever 1b is configured to be able to be received at the full load position by the fuel restrictor 30, and the starting spring 8 is connected to the weight-side lever 1a so that the metering rack 6 can be biased to the start increasing position. It is of the form. That is, in the basic structure, the spring-side lever 1b is received by the fuel restrictor 30 at the full load position, and the weight-side lever 1a is pulled by the starting spring 8 so as not to be able to swing to the increased side. It is configured to be able to swing from the load position to the start increasing position on the increasing side.

[0003]

2. Description of the Related Art As a prior art of this type, as shown in FIG. 6, a weight-side lever 1a and a spring-side lever 1b face a pump chamber 13 of a vertical diesel engine E, and between the levers 1a and 1b. And one end of the starting spring 8 is connected to the weight side lever 1.
a, and the other end of the starting spring 8 is connected to the front side wall 11 of the gear chamber 12 via a fastening pin 21.
Normally, when the tension of the starting spring 8 is large, the starting fuel is excessively supplied and the amount of generated black smoke and unburned harmful components increases, so that the tension of the starting spring 8 is set to be weak.

[0004]

At the time of starting, the governor lever 1 is fully pulled by the tension of the starting spring 8 to the starting increasing position to increase the starting fuel. However, with this increase, the rotation speed of the engine E increases. , Governor Force G
F also increases.

In the above prior art, since the tension of the starting spring 8 is set to be weak, the starting spring 8 is insufficient to counter the governor force GF. That is, when the starting spring 8 increases the starting amount, as shown in FIG.
Increases, the governor lever 1 swings to the fuel reduction side L, and the metering rack 6 returns.

As a result, the rotation speed of the engine E may hunt up and down (see the arrow H in FIG. 7), delaying the start-up, and possibly causing the engine E to stall. In particular, if the warm-up operation is performed in cold weather, such adverse effects are likely to occur, so that it is required to start the diesel engine promptly. SUMMARY OF THE INVENTION It is a technical object of the present invention to eliminate a starting error in cold weather and promote warm-up operation.

[0007]

Means for achieving the above object will be described below with reference to FIGS. 1 to 5 showing an embodiment. That is, in the present invention, the auxiliary starting spring 10 is configured to be connectable to the weight side lever 1a in parallel with the starting spring 8 in the diesel engine starting and increasing device having the basic structure, and the auxiliary starting spring 10 is connected to the temperature-sensitive operating member. When the temperature is lower than the set temperature, the auxiliary starting spring 10 is in the operating position P and is connected to the weight side lever 1a. Is configured to be disconnected.

The auxiliary starting spring 10 is formed of a temperature-sensitive operating member. More specifically, a spring made of a shape memory alloy, a spring made of a bimetal, a combination of a normal spring and a spring made of a shape memory alloy (for example, , Serial connection), or a combination of a spring and a bimetal. The operation posture P and the operation release posture Q are switched between these two postures by intermittent deformation in the auxiliary starting spring 10 made of, for example, a shape memory alloy (that is, two-position switching). In the auxiliary starting spring 10 made of bimetal, two postures, an operation posture P and an operation release posture Q, are defined by a deformation start posture and a deformation end posture in a continuous deformation process.

[0009]

When the engine is started in cold weather, the auxiliary starting spring 10 is activated.
Becomes lower than the set temperature, becomes the operating posture P, and is connected to the governor lever 1. For this reason, the weight-side lever 1a is pulled by the tension of the two springs, the starting spring 8 and the auxiliary starting spring 10, and the weight of the starting is increased. In this case, even if the governor force GF increases due to an increase in the rotation speed of the engine E, the governor force GF is opposed by the tension of the two starting springs 8 and 10. Therefore, unlike the prior art, the governor force GF is increased before the rotation speed of the engine E starts. The force GF does not increase, and the return of the metering rack 6 to the fuel reduction side L is prevented.
The rotation speed of the engine E rises quickly.

When the rotation speed of the engine E rises, the body temperature of the engine E rises and exceeds the set temperature of the auxiliary starting spring 10, so that the auxiliary starting spring 10 quickly becomes the operation release posture Q and the weight side lever 1a Since the connection to is released, there is no hindrance to normal operation thereafter.

[0011]

(1) In cold weather, the auxiliary starting spring is in the operating position and is connected to the weight side lever, and its tension opposes governor force, so that the engine speed during cold start does not hunt. It can quickly start up, promote warm-up operation, prevent engine stalls, and eliminate starting errors.

(2) In parallel with the existing starting spring,
Since it has a simple structure in which the auxiliary starting spring composed of the temperature-sensitive operating member is simply arranged so as to be connectable, it can be implemented at low cost.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a main part of a diesel engine start increasing device showing a state in which an auxiliary starting spring has been switched to an operating position, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. FIG. 4 is a vertical sectional left side view of a main portion of the vertical diesel engine, and FIG. 5 is a diagram showing a change over time of the rotation speed of the engine.

As shown in FIG. 4, the diesel engine E
A gear chamber 12 and a pump chamber 13 are provided in front and rear adjacent to each other, a fuel injection pump 5 is accommodated in the pump chamber 13, and a two-lever governor lever 1 including a weight-side lever 1a and a spring-side lever 1b is supported by a fulcrum 14. Is supported at the center so as to face the gear chamber 12 and the pump chamber 13. A fuel injection camshaft 15 is supported laterally in the pump chamber 13, and the fuel injection pump 5 is configured to be able to be driven to be injected by the fuel injection camshaft 15,
A centrifugal governor G is arranged at the front end of the injection cam shaft 15.

As shown in FIG. 4, the governor weight 2 of the centrifugal governor G is engaged with the input pin 3 of the weight side lever 1a via the governor sleeve 16, and the bifurcated output portion 4 of the weight side lever 1a. Is engaged with the rack pin 6a of the metering rack 6 of the fuel injection pump 5. The spring-side lever 1b is moved through the governor spring 7
7, the spring-side lever 1b and the weight-side lever 1a are provided with a torque-up device 18 so that the weight-side lever 1a is disproportionate between the governor force GF of the governor weight 2 and the spring force SF of the governor spring 7. To make it swingable. However, the fuel limiting bolt 30 is made to protrude into the gear chamber 12 from the front side wall 11 of the gear chamber 12, and the tip of the fuel limiting bolt 30 faces the spring side lever 1b. So that it can be received at the full load position with
The swing to the fuel increasing side R beyond the full load position is restricted.

As shown in FIGS. 1 to 4, an elongated hole 19 is formed in the upper shoulder portion of the weight side lever 1 in the front-rear direction, and a fastening pin 21 is fixed to the front side wall 11 of the gear chamber 12. The starting spring 8 is connected between the hole 19 and the fastening pin 21, and the auxiliary starting spring 10 is arranged to be connectable between the elongated hole 19 and the fastening pin 21 in parallel with the starting spring 8. That is, the auxiliary starting spring 10 is made of a shape memory alloy, and as shown in FIGS. 1 to 3, its front end 10a is connected to a fastening pin 21 and its rear straight part 10b is made long. , The distal end of the linear portion 10b is bent in two stages, that is, rightward and leftward, and upward.
0 is loosely fitted into the elongated hole 19 of the weight-side lever 1a so as not to come out (see FIG. 2).

The auxiliary starting spring 10 has a set temperature.
At a low temperature (specifically, −10 ° C.) or lower, as shown in FIG. 1, the linear portion 10 b of the spring contracts forward and switches to the operating position P, and the bending engagement portion 20 becomes the elongated hole 1.
9, the weight side lever 1a
It is configured to be connected to. When the auxiliary starting spring 10 becomes higher than the set temperature, as shown in FIG.
The linear portion 10b of the spring expands rearward and the operating posture P
To the operation release posture Q, and the bending engagement portion 20
Is configured to release the connection with the weight-side lever 1a. As shown in FIG. 1, an auxiliary starting spring 10 made of a shape memory alloy has a linear portion 10b having a length of 20 m.
m, and the length of change A (that is, stroke) of reduction and expansion is preferably set to about 11 to 12 mm.

Therefore, the function of the diesel engine start increasing device of this embodiment will be described. When the engine E is started in a cold condition of −10 ° C. or less, as shown in FIG. 1, the auxiliary starting spring 10 becomes lower than the set temperature and switches to the operating position P, and the bending engagement portion 20 is connected to the governor lever 1. For this reason, the governor lever 1 is connected to the starting spring 8.
And the tension of the two springs of the auxiliary starting spring 10 is pulled to the starting increasing position to increase the starting. in this case,
Even if the governor force GF increases due to an increase in the number of revolutions of the engine E, it is countered by the tension of the two starting springs 8 and 10. Therefore, unlike the related art, the return of the metering rack 6 to the fuel reduction side L is performed. To prevent. For this reason, as shown by the arrow B in FIG.
It rises quickly to about 600 rpm.

When the rotation speed of the diesel engine E rises, the body temperature of the engine E rises above the set temperature of -10 ° C., and as shown in FIG. The operation is promptly switched to the operation release posture Q, and the bending engagement portion 20 is connected to the governor lever 1.
Break the connection to. For this reason, in normal operation after starting, the governor lever 1 (specifically, the weight side lever 1
a) is the governor force GF of the governor weight 2 and the spring force S of the governor spring 7 as described above.
The auxiliary starting spring 10 is swung by an unbalanced force with F.
The effect of the tension of the wire is completely eliminated. As a result, the startup increasing device according to the present embodiment eliminates a start error in cold weather and can promote a warm-up operation in cold start. In particular, since a spring made of a shape memory alloy is used for the auxiliary starting spring 10,
The posture can be intermittently switched to the two postures of the operation posture P and the operation release posture Q with high sensitivity.

In the above embodiment, the auxiliary starting spring 10 is formed of a shape memory alloy spring. However, a bimetal leaf spring may be used, or a normal spring and a shape memory alloy spring may be connected in series. Connected to
Alternatively, other embodiments using various temperature-sensitive operating members are possible, such as combining a normal spring and a bimetallic leaf spring in series.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a diesel engine start increasing device showing a state in which an auxiliary starting spring is switched to an operating posture.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a side view of a main part of the starting increasing device, showing a state in which an auxiliary starting spring has been switched to an operation release posture.

FIG. 4 is a vertical sectional left side view of a main part of the vertical diesel engine.

FIG. 5 is a graph showing the change over time in the number of revolutions of the engine.

FIG. 6 is an equivalent view of FIG. 4 showing a conventional technique.

FIG. 7 is an equivalent view of FIG. 5 showing the prior art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Governor lever, 1a ... Weight side lever, 1b ... Spring side lever, 2 ... Governor weight, 3 ... Governor lever input part, 4 ... Governor lever output part, 5 ... Fuel injection pump, 6 ... Metering rack, 7 ... Governor Spring, 8
... Starting spring, 10 ... Auxiliary starting spring, 30 ...
Fuel limiter, P ... Operating posture of auxiliary starting spring, Q ...
Post-release posture of auxiliary starting spring, GF: governor force, SF: spring force of governor spring,
E: Diesel engine.

Claims (1)

(57) [Claims] 1. A governor lever for a diesel engine (E)
Support (1) and push governor lever (1) to the weight side lever.
(1a) and a spring-side lever (1b), and the governor weight (2) of the centrifugal governor (G) is connected to the input part (3) of the weight-side lever (1a).
The output unit (4) of (1a) is connected to the metering rack of the fuel injection pump (5).
(6), the governor spring (7) is connected to the weight lever (1a) via the spring lever (1b), and the weight lever (1a) is connected to the governor weight (2).
Of the governor spring (GF) and the spring force (SF) of the governor spring (7). The spring-side lever (1b) is moved to the full load position by the fuel restrictor (30). It is configured to be able to receive and the weight side lever
(1a) connected to a starting spring (8) and a metering rack (6)
The auxiliary starting spring (10) can be connected to the weight side lever (1a) in parallel with the starting spring (8). ,
The auxiliary starting spring (10) is formed of a temperature-sensitive operating member. When the auxiliary starting spring (10) is at a low temperature equal to or lower than the set temperature, the auxiliary starting spring (10) is in the operating posture (P) and is connected to the weight side lever (1a). When the temperature becomes higher than the temperature, the operation is released (Q) and the connection with the weight-side lever (1a) is released.