JP2610466B2 - 3-lever governor support structure - Google Patents

Description

The present invention relates to a support structure for a three-lever governor that supports a tension lever and first and second governor levers on the same governor lever shaft.

(Prior Art) Generally, in a three-lever governor, first and second governor levers 7 are provided on both sides of a tension lever 8 as shown in FIG.
9 are arranged on both sides, and their supporting structure is a structure in which the three levers 7, 8, 9 are supported by a common bearing member (for example, a bush) 55 as shown in FIG. In such a structure, the tension lever 8 and the first and second governor levers 7 and 9 in the low speed rotation range of the engine.
When operated separately, the frictional resistance is large, and the smooth movement of the governor according to the centrifugal force of the governor weight is hindered.
As a result, the fuel injection amount fluctuates greatly, which tends to cause engine hunting or engine stall during sudden deceleration.

More specifically, a set spring as shown in FIG.
Due to the presence of 25, the second governor lever 9 is pressed in the X1 direction, while the first governor lever 7 is pressed in the X2 direction, and the two levers 7, 9 have the effect of pinching the bush 55 in FIG. In the high-speed range in which the tension lever 8 and the first and second governor levers 7 and 9 rotate integrally, the governor force is relatively large, so that smooth governor operation is maintained. Region, that is, the governor force due to the governor weight is small, and the second governor lever 9 and the like rotate separately from the tension lever 8, so that the resistance of the governor link system can easily affect the speed control performance, so that the speed is smooth in a low-speed rotation region. Operation cannot be maintained, and good governing performance cannot be maintained.

Especially in all-speed governors, since the driver's operating force via the accelerator lever etc. directly opposes the centrifugal force of the governor weight, it is necessary to minimize the governor weight in terms of driver's operability. However, when the governor weight is reduced, the speed control performance in the low speed range becomes more unstable as described above.

(Object of the Invention) An object of the present invention is to provide a low-speed region, that is, a small governor force due to a governor weight, that the second governor lever and the like rotate separately from the tension lever, and that the governor link system resistance determines the speed control performance. An object is to obtain good speed control performance by reducing frictional resistance between a tension lever and a governor lever in an easy low speed range.

(Technical Means for Achieving the Object) In order to achieve the above object, the present invention provides a tension lever connected to a governor spring, a first governor lever connected to a fuel increase / decrease rack of a fuel injection pump, and a governor sleeve. A second governor lever having a force receiving portion facing the first and second governor levers is rotatably supported on one governor lever shaft, and a direction in which the two governor levers are closed about the governor lever shaft center between the first and second governor levers. In a three-lever governor support structure in which a set spring is stretched so as to urge the spring and a starting increasing spring is contracted between the second governor lever and the tension lever, the tension lever is interposed through the first bearing member. A second bearing member rotatably fitted to the governor lever shaft to rotate the first and second governor levers independently of the first bearing member. And is rotatably fitted to the governor lever shaft through the shaft.

(Operation) When the first and second governor levers rotate independently of the tension lever independently in the low-speed rotation region, the first bearing member supporting the tension lever rotates on a second bearing member separate from the first bearing member. Move. Therefore, even when the first and second governor levers are pressed against the second bearing member by the forcible force of the set spring, the first and second governor levers rotate independently of the tension lever, and a smooth operation can be secured.

(Embodiment) FIG. 2 shows a governor of a supercharged diesel engine to which the present invention is applied. In FIG. 2, a governor case 3 fixed to a front end of a pump case 4 has a fuel injection pump. The camshaft 11 extends, and a governor sleeve 6 is supported at the front end of the camshaft 11 so as to be movable in the axial direction, and the governor weight 5 is supported so as to be able to expand. The governor weight 5 comes into contact with the governor sleeve 6, and the governor weight 5 expands due to an increase in the number of revolutions of the camshaft 11, and pushes the governor sleeve 6 forward.

The governor lever shaft 17 has three levers: a first governor lever 7, a tension lever 8, and a second governor lever 9.
Are rotatably supported according to the invention. First, the structure of each of the levers 7, 8, and 9 will be described. The tension lever 8 is formed in an inverted "L" shape, and a governor spring 10 is stretched between the rear upper end and the front end of the front access control lever 22. Governor spring 10
Urges the tension lever 8 toward the fuel increasing side.
The control lever 22 has a governor case 3 rotatably supported via a control shaft 24 and is connected to an accelerator device (not shown) such as an accelerator pedal. 31 is a fuel limiter, 32 is a stop lever.

In FIG. 3 which shows an exploded perspective view of the governor, the governor lever 7 has a pair of left and right lever portions 7a and 7b integrally connected by a connecting portion 7c, and one governor lever portion 7a extends upward to extend the rack operating link 20. Via a fuel injection pump. The other governor lever portion 7b has a set spring 25 extending between its upper rear end and the upper front end of the second governor lever 9. The set spring 25 pulls the upper spring front end of the governor lever portion 7b. Is engaged with the projection at the upper front end of the second governor lever 9.

The second governor lever 9 also includes a pair of left and right lever portions and a connecting portion 9a for integrally connecting the lower ends thereof. The lower end connecting portion 9a of the second governor lever 9 includes a shifter 26 to receive a governor force.

A starting increasing spring 28 is contracted between the lower end of the tension lever 8 and the connecting portion 9a of the second governor lever 9.

The tension lever 8 has a pair of left and right first
A bush (first bearing member) 15 is press-fitted, and the first bush 15 is rotatably fitted to a governor lever shaft 17 as shown in FIG. The right and left portions of the first governor lever 7 and the second governor lever 9 are respectively left and right second governor levers.
Each bush (second bearing member) 16 is fitted to the outer peripheral surface, and each second
Each of the bushes 16 is fitted to a governor lever shaft 17.

 The operation will be described.

Before starting the engine, if the governor force is not applied to the shifter 26 and the tension lever 8 is pulled via the governor spring 10 by the control lever 22,
The tension lever 8 contacts the fuel limiter 31,
The starting increasing spring 28 of the connecting portion a of the second governor lever 9
, And at the same time, the governor lever 7 is pulled toward the fuel increasing side via the set spring 25, whereby the fuel increase at the time of starting is ensured, and the starting is facilitated.

When the engine is started and at low speed, the governor lever 7 and the second governor lever 9 receive a small governor force and rotate on the second bush 16 independently of the tension lever 8 against the starting increasing spring 28 due to the small governor force. At this time, the tension lever 8 does not rotate.

When the governor force increases due to high-speed rotation after the engine is started, the second governor lever 9 is pushed by the governor sleeve 6 to compress the start increasing spring 28, and as shown in FIG. Lever 8
And the levers 8 and 9 rotate integrally. That is, the rotational speed is controlled by the balance between the governor spring 10 and the thrust force of the sleeve 6. At this time, the tension lever 8 pivots on the governor lever shaft 17 together with the first bush 15, the second governor lever 9 pivots via the second bush 16, and the first governor lever 7 adjusts the tension and projection of the set spring 25. The second governor lever 9 rotates together with the second governor lever 9 by engagement with the second governor.

To stop the engine urgently during high-speed driving or the like, the stop lever 32 is rotated. Then, only the governor lever 7 rotates toward the fuel decreasing side against the elastic force of only the set spring 25 by the cam action, reaches the fuel stop position, and stops the engine.

FIG. 6 shows a change in rotation speed in the low-speed rotation range when the bearing member is divided as in the present invention, and FIG. 7 shows a change in rotation speed in the conventional example shown in FIG.

(Other Embodiments) (1) The example shown in FIG. 4 shows the first and second governor levers 7,
A second bush 16 extending to both left and right end portions of the second bush 16 is fitted to the governor lever shaft 17, and the governor lever 7 and the second governor lever 9 are directly supported on both end portions of the second bush 16, respectively. The first bush 15 is fitted on the outer periphery, and the tension lever 8 is fitted (pressure fitted) on the outer periphery of the first bush 16.

(2) As the first and second bearing members, for example, a needle bearing or the like can be used in addition to the bush.

(Effects of the Invention) As described above, the present invention provides a tension lever 8 connected to the governor spring 10, a first governor lever 7 connected to the fuel increasing / decreasing rack, and a contact with the governor sleeve 6, and the first governor lever. And a second governor lever 9 over which a set spring 25 is stretched.
In the lever governor, the tension lever 8 is fitted to the governor lever shaft 17 via the first bearing member, and the first and second
Since the governor levers 7 and 9 are fitted to the governor lever shaft 17 via the second bearing member that can rotate independently of the first bearing member, the following effects are obtained.

(1) When the first and second governor levers 7 and 9 rotate during low-speed rotation, the governor levers 7 and 9 are moved to the tension lever 8 even if the set spring 25 pinches the governor levers 7 and 9. Is supported by a second bearing member different from the above, the frictional resistance between the tension lever 8 and the first and second governor levers 7 and 9 is small, and the first and second governor levers 7 and 9 are connected to the second bearing member. It rotates smoothly on the member. In other words, there is no fear of occurrence of turbulence or the like, smooth operation can be ensured, and good speed control performance can be obtained even at low speed rotation.

(2) Such an effect is extremely effective for an engine such as an all-speed governor in which the control lever operation force is reduced by reducing the weight of the governor weight. In other words, the fuel supply control is stable even at low speed rotation with a small governor force, and hunting of the engine and unexpected engine stall can be prevented, and black smoke can be prevented from being discharged.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (corresponding to the II section in FIG. 2) of a three-lever governor to which the present invention is applied, and FIG.
II sectional view, FIG. 3 is an exploded perspective view of the governor of FIG. 1, FIG.
FIG. 5 is a partial sectional view of another embodiment, FIG. 5 is a partial sectional view of a conventional example, FIG. 6 is a graph showing a change in engine speed when the present invention is applied, and FIG. It is. 6
... governor sleeves, 7, 9 ... first and second governor levers, 8 ... tension levers, 10 ... governor springs, 17 ... governor lever shafts, 26 ... shifters (governor force receiving portions), 28 ... starting Increasing spring

Claims (1)

(57) [Claims] 1. A governor lever comprising: a tension lever connected to a governor spring; a first governor lever connected to a fuel increase / decrease rack of a fuel injection pump; and a second governor lever having a force receiving portion facing the governor sleeve. A set spring is rotatably supported on the shaft, and a set spring is stretched between the first and second governor levers so as to urge the governor levers in a direction of closing the two governor levers about the rotational axis of the governor lever. In a three-lever governor support structure in which a starting increasing spring is contracted between tension levers, the tension lever is rotatably fitted to a governor lever shaft via a first bearing member, and the first and second governors are provided. The governor lever is rotatably fitted to a governor lever shaft via a second bearing member that can rotate independently of the first bearing member. The support structure of the third lever governor.