JPH06213008A - Centrifugal governor for fuel injection pump of internal combustion engine - Google Patents

Abstract

PURPOSE: To avoid transmission of vibration to a governor rod so as to prevent fluctuation of a fuel injection quantity by employing a structure that provides a connection portion between a governor sleeve and the governor rod with a clearance in a radial direction against the sleeve. CONSTITUTION: In order to avoid high-amplitude vibration generated by two centrifugal bobs in fast turning from acting on a ring web 10 of a governor sleeve 9 and thus being transmitted to a governing rod 32, a connection portion between the governor sleeve 9 and the governor rod is provided with a radial clearance. Therefore, a sleeve pin 19 is formed in the shape of a spherical segment or acutely on its end face projecting to a guide sleeve 14, thus punctiformly carrying out axial force transmission. Further, a clearance is formed between a cylindrical peripheral surface of the sleeve pin 19 and an inner wall of the guide sleeve 14. Due to this clearance, transmission of oscillating motion of the governor sleeve 9 to the sleeve pin 19 via the guide sleeve 14 is avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal speed governor for a fuel injection pump of an internal combustion engine, which includes a centrifugal speed governor driven synchronously with the rotational speed of the fuel injection pump. The centrifugal weight of the centrifugal governor acts on the governor sleeve that is guided in the axial direction via each one angle lever, and the governor sleeve acts as an angle lever. On the opposite side to a guide pin and a deflection lever, which are pivotally connected via a bearing pin which is arranged perpendicular to the governor sleeve movement in the axial direction. The speed governor is pivotally connected, and the deflecting lever is at least indirectly connected to the discharge amount adjusting member (adjusting rod), and in this case, at least when the specified rotational speed or load is exceeded. Sleeve Against the adjusting force associated with the centrifugal force, it relates to a centrifugal governor of the type returning force of the adjusting spring is made to act.

[0002]

2. Description of the Prior Art German Patent 2858589
In a centrifugal speed governor known from the specification, a centrifugal weight of a centrifugal speed governor driven by a drive shaft at a rotational speed synchronous with an engine rotational speed is provided with an angle lever and a speed governor. It acts on the sleeve pin with the joint head via the machine sleeve. A bearing pin is laterally guided on the sleeve pin, and a guide lever is pivotally mounted on the bearing pin. The guide lever is pivotally mounted on a bearing pin fixed to the casing and is adjusted. A speeding sleeve is guided during its reciprocating movement, and in this case an idling spring acting against the movement of the speed governor sleeve is in contact with the guide lever.

Furthermore, a deflection lever is engaged with the bearing pin, and the other end of the deflection lever is loaded by an operating lever located outside the governor casing, and the deflection lever is deflected. The lever is connected to the adjusting lever via a bearing point located between its two ends. This adjusting lever is, on the one hand, pivotally attached to the adjusting rod via a link plate and, on the other hand, is supported by an adjustable swivel bearing.

After passing the idling travel distance, the sleeve pin comes into contact with the Angleich capsule, which acts as a stroke stop. The Angleich capsule is arranged on a force transmission lever which is likewise pivotable about a bearing pin fixed to the casing and is loaded by an adjusting spring, On the other hand, the adjusting spring is supported on the governor casing. The force of the adjusting spring then acts against the force of the centrifugal governor after passing through the idling range and after overcompression of the Angreich spring in the Angleich capsule. In this case, a balance state is created between the centrifugal force related to the rotational speed of the centrifugal speed governor whose position corresponds to the defined fuel injection amount and the spring force of the adjusting spring.

In order to ensure accurate operation of the centrifugal speed governor in this known arrangement, on the one hand defined characteristic values such as speed and load are injected via the corresponding speed governor position and thus the injection speed. It is necessary that the quantity can be accurately reproduced over a long period of time, and on the other hand it is necessary to keep the frictional forces as small as possible. And this is the first time
It is possible to keep the reproducibility error of the adjustment accuracy as small as possible.

In known centrifugal governors of the type mentioned at the outset, in order to avoid jamming of the governor rod with respect to the centrifugal governor, between the carrier of the centrifugal governor and the governor sleeve. The coupling part is constituted by a cardan joint, and in this case the governor sleeve at its end facing the centrifugal weight has a cylindrical retaining via a radially shaped inner ring web. It is guided axially along the body and is able to carry out relative movements with respect to the holding body via the inner ring web. Due to this configuration, the matching error between the holder of the centrifugal speed governor and the speed governor sleeve or speed governor rod is limited to the specified conditions, that is, the increased frictional force and tension force. Can be compensated under defined conditions such that adjustment accuracy can be obtained by.

However, the known centrifugal speed governor has the following drawbacks. That is, in the known centrifugal speed control device,
The vibration in the centrifugal governor, that is, the vibration generated in the centrifugal governor by the introduction of an asymmetrical force due to the deviation between the holder of the centrifugal governor and the governor sleeve, is the governor rod. This vibration is further transmitted to the discharge amount adjusting member (adjustment rod), where it causes a change in the adjustment distance, which in turn causes a change in the injection amount in each pump element. Such fluctuations in the discharge amount of the individual pump elements are further manifested as fluctuations in the fuel amount injected into the combustion chamber of the internal combustion engine to which fuel is supplied, which causes uneven preparation of the air-fuel mixture, which in turn causes a The uniform combustion disadvantageously increases fuel consumption and emission of harmful substances.

[0008]

SUMMARY OF THE INVENTION The object of the invention is therefore to improve a centrifugal speed governor of the type mentioned at the beginning such that the oscillating movement occurring in the speed governor sleeve is transmitted to the speed governor rod. It is an object of the present invention to provide a centrifugal speed governor capable of reliably avoiding the above.

[0009]

In order to solve this problem, in the structure of the present invention, the speed governor sleeve is attached to the bearing pin through the sleeve pin in a direction transverse to the longitudinal direction of the speed governor sleeve. It is pivotally connected to the bearing pin.

[0010]

The centrifugal speed governor constructed according to the present invention has the following advantages over known centrifugal speed governors. That is, in the centrifugal speed governor according to the present invention, the connection between the speed governor sleeve and the speed governor rod is configured with radial play with respect to the speed governor sleeve in the circumferential direction. It is possible to transmit the movement in the axial direction from the speed governor sleeve to the governor rod, and at the same time, the rocking motion of the governor sleeve that is generated in some cases is transmitted to the governor rod. ,
As a result, swaying of the governor rod is reliably prevented. Further, in this case, the configuration for breaking the connection between the centrifugal governor and the governor rod as in the present invention is not limited to the centrifugal governor of the type described above, but is applicable to all types of centrifugal regulators. It can be used in speed devices.

Another advantage of breaking the connection between the member that causes the vibration and the member that transmits the influence of the vibration to the discharge amount as in the present invention is as follows. . That is, when configured as in the present invention,
It is possible to reduce friction during the transmission of motion, which in turn reduces the adjustment force and reduces wear.

In order to achieve this in an advantageous manner,
In the arrangement according to claim 2, the sleeve pin is of a pot type with a reduced diameter section on the side facing the governor sleeve, the inner diameter being larger than the reduced diameter of the sleeve pin. The guide sleeve projects into the guide sleeve, and the guide sleeve is force-coupled to the governor sleeve by contact of the sleeve pin end surface at the sleeve bottom through the ring flange at the open end of the guide sleeve. There is. With this configuration,
It is possible to completely maintain the axial force transmission for guiding the movement of movement from the governor sleeve of the centrifugal governor to the governor rod, and at the same time, to prevent the occurrence of the force in the governor sleeve. It is possible to reliably avoid further transmission of a certain rocking motion.

With such a construction, not only the advantage that the assembly is simplified is obtained, but also the advantage that expensive adjustment work can be omitted is obtained. The sleeve pin is kept in contact with the guide sleeve by the forces of the idling spring and the adjusting spring, and the radial manufacturing error may be relatively large due to the desired radial play. Because there is no.

In a further advantageous configuration according to claim 3, the force transmission between the end surface of the sleeve pin and the bottom of the sleeve is point-like, so that the end surface of the sleeve pin has a spherical segment. It is configured in a shape. With this configuration, relative movement between the sleeve pin and the governor sleeve is possible, and new tension due to the catch or vibration of the centrifugal governor is transmitted to the governor rod. There is no such thing.

[0015]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows in simplified form a centrifugal speed governor according to the invention, in which in order to interrupt the transmission of vibrations between the centrifugal speed governor and the speed governor rod, As will be described in detail, radial play is provided at the connection between the sleeve pin and the guide sleeve which is guided in the governor sleeve.

In the embodiment of the centrifugal speed governor shown in simplified form in FIG. 1, the centrifugal speed governor 1 is driven by a drive shaft 2 at a rotational speed synchronized with the engine rotational speed. In this case, the two centrifugal weights 3 are the centrifugal weight holders 7 of the centrifugal speed governor 1.
A speed governor sleeve 9 is provided via an angle lever 4 which is rotatably pivoted on and has a bearing point 8 therefor.
The speed governor sleeve 9 is guided by the ring web 10 configured as a radial member so as to be slidable in the axial direction along the holding body 7 in the inner diameter portion, and serves as a cardan joint. , Is effective in preventing axial displacement and rotation body movement. The governor sleeve 9 is therefore of pot-shaped design and has at its open end facing the angle lever 4 a flange 11 projecting radially outwards.
The end of the angle lever 4, which is an adjusting lever, on the side opposite to the centrifugal weight 3 is in contact with 1. The speed governor sleeve 9 at the bottom portion 12 opposite to the angle lever 4 is
It has a central hole 13 into which a pot-shaped guide sleeve 14 projects at its closed end, between the wall of the central hole 13 and the outer diameter of the guide sleeve 14. There is a small play in this
A small catch of the governor sleeve 9 via the inner ring web 10 is possible, which catch is not transmitted to the guide sleeve 14 by the tension with the guide sleeve 14.

The guide sleeve 14 has a ring flange 16 at its open end.
A spacer disc 17 and a thrust bearing 18 are arranged between the bottom plate 12 and the bottom portion 12 of the speed governor sleeve 9. In this case, the axial movement of the governor sleeve 9 is associated with the centrifugal force associated with the rotational speed of the centrifugal weight 3 and the resulting swivel distance of the angle lever 4, It is indirectly transmitted to the guide sleeve 4 by the sleeve 9, and this movement is further guided via the sleeve pin 19 to the governor rod. For this purpose, the sleeve pin 19 projects into the guide sleeve 14 in a section 21 of reduced diameter and at its end face 22 it contacts the closed sleeve bottom. On the side opposite to the guide sleeve 14, a bearing pin 23 is guided in the transverse hole 24 of the sleeve pin 19 perpendicularly to the axial direction of travel of the governor sleeve 9. 23 has bearing pins 4 fixed on the other side to the casing.
One end of a guide lever 26, which is supported via 0, is rotatably connected, and this guide lever 26 guides the governor sleeve 9 during its moving movement. .

A deflection lever 27 is further connected to the bearing pin 23, and the other end of the deflection lever 27 is
It is connected to an adjustable member (not shown) which can be optionally operated on the outside of the pump casing. Deflection lever 27
Is connected to an adjusting lever 31 via a bearing point 29 located between its ends.
On the one hand, 1 is pivotally mounted on an adjusting rod 32, which acts as a discharge adjusting member of the fuel injection pump, and on the other hand, it is supported by a swivel bearing 33.

Governor sleeve 9 or sleeve pin 1
Within the range of movement of 9, the Angleich capsule 43 is screwed into a force-transmitting lever 45, which acts as a support member, and the force-transmitting lever 45 is likewise a casing. Adjustable spring 4 is rotatable about fixed bearing pin 40.
7, its free end 49 is pressed against a stopper 51 fixed to the casing. The preload of the adjusting spring 47, which acts as a limiting speed adjusting spring, is in this case defined by its mounting position, which is movable and adjustable. Pin 53 screwed into the governor casing
A leaf spring, which is designed as an idle spring 55, is supported via the force transmission lever 45 via a support angle 57 which acts as a fixed support.
The lateral pin 59 of the guide lever 26 is pressed by the end of the guide lever 26 which is supported by the guide lever 26. By this lateral pin 59, the preload of the idling spring 55 is transmitted to the speed governor sleeve 9, and the following is achieved by the reaction force introduced into the force transmission lever 45 via the support angle 57. That is, in this case, the force of the idling spring 55 does not act on the limit rotation speed, but the force of the idling spring 55 is compensated via the reaction force introduced into the force transmission lever 45.

As a result of the different force actions of the two centrifugal weights 3, especially at high speeds, the governor sleeve 9
In order to avoid that high-amplitude oscillating movements introduced into the governor sleeve 9 are transmitted to the remaining governor rods, in this case in particular the adjusting rod 32, by the action of the ring web 10 of the governor sleeve 9, A radial play is provided at the connection between the machine sleeve 9 and the governor rod, and this play is realized by the radial play of the sleeve pin 19 in the guide sleeve 14. For this purpose, the sleeve pin 19 is designed as a spherical segment or at an acute angle on the end face 22 which projects into the guide sleeve 14, in which case the sleeve pin 19 at its end face 22 is a governor rod, in particular a guide lever. A guide sleeve 14 and a sleeve pin, which are connected to the governor sleeve 9 by being held in contact with the bottom of the guide sleeve 14 by means of 26, and whose end face 22 is designed as a spherical segment or at an acute angle. The axial force transmission to and from 19 is point-like. In this case, a play is provided between the cylindrical peripheral surface of the sleeve pin 19 projecting into the guide sleeve 14 and the inner wall of the guide sleeve 14, and this play causes the speed governor sleeve 9 to move. Transmission of the rocking movement to the sleeve pin 19 via the guide sleeve 14 is avoided, and in this case the guide sleeve 14 is able to perform a rocking movement about the sleeve pin 19.

In this case, at the bottom of the guide sleeve 14,
In order to properly guide the end surface 22 of the sleeve pin 19,
The recessed portion or the ball cutout portion may be integrally processed.

Thus, as in the present invention, the vibration excitation in the centrifugal speed governor is decoupled from the separate power chain formed by the speed governor rod, thereby transmitting the vibration to the adjusting rod of the fuel injection pump. It is possible to avoid, and thus it is possible to guarantee an accurate reproduction of the metering of the discharge amount over a long period of time. This allows the operating characteristics of the fueled internal combustion engine to be significantly improved compared to known centrifugal speed governors, and in this case the solution according to the invention is the centrifugal speed governor of all types. Is compatible with.

Further, in the centrifugal speed governor according to the present invention, it is possible to reduce the time and labor required for manufacturing regarding the manufacturing error of the member and the time and effort for adjusting the discharge rate as compared with the known centrifugal speed governor.

[Brief description of drawings]

FIG. 1 is a simplified view of a centrifugal speed governor according to the present invention.

[Explanation of symbols]

1 centrifugal governor, 2 drive shafts, 3 centrifugal weights,
4 angle levers, 7 holders, 8 bearings,
9 governor sleeve, 10 ring web, 11
Flange, 12 bottom, 13 central hole, 14 guide sleeve, 16 ring flange, 17 spacer disc, 18 thrust bearing, 19 sleeve pin, 21 section, 22 end face, 23 bearing pin,
24 lateral holes, 26 guide levers, 27 deflection levers, 29 bearing points, 31 adjustment levers, 32
Adjusting rod, 40 bearing pin, 43 Angleich capsule, 45 force transmission lever, 47 adjusting spring,
49 free end, 51 stopper, 53 pin, 5
5 Idling springs, 57 support angles, 59
Lateral pin

Claims (4)

[Claims] 1. A centrifugal speed governor for a fuel injection pump of an internal combustion engine, comprising a centrifugal speed governor (1) driven synchronously with the number of revolutions of the fuel injection pump. The centrifugal weights (3) of the governor (1) act via one angle lever (4) on each governor sleeve (9) which is guided axially, A governor sleeve (9) is connected to the sleeve pin (19) on the side opposite the angle lever (4), the sleeve pin (19) being adapted for axial governor sleeve movement. The guide lever (26) and the deflection lever (27) are pivotally connected to each other via a bearing pin (23) arranged vertically, and the deflection lever (27) is pivotally connected to the guide lever (26) and the deflection lever (27).
Is at least indirectly connected to the discharge rate adjusting member (adjustment rod 32) and, in this case, is associated with the centrifugal force of the governor sleeve (9) at least when the specified speed or load is exceeded. In a centrifugal speed governor of the type in which the restoring force of the adjusting spring (47) acts against the adjusting force, the speed governor sleeve (9) has a sleeve pin (1).
9) via a bearing pin (23) so as to be pivotable with respect to the bearing pin (23) transversely to the longitudinal direction of the speed governor sleeve (9). To do
Centrifugal governor for fuel injection pump of internal combustion engine. 2. The reduced diameter of the sleeve pin (19) in the reduced diameter section (21) on the side facing the governor sleeve (9) is greater than the reduced diameter of the sleeve pin (19). It projects into a pot-shaped guide sleeve (14) having a large inner diameter, and the guide sleeve (1
4) to the sleeve pin end surface (2
2. Centrifugal adjustment according to claim 1, wherein the contact of (2) makes a force connection with the governor sleeve (9) via a ring flange (16) at the open end of the guide sleeve (14). Speed equipment. 3. Force transfer between the end surface (22) of the sleeve pin (19) and the bottom of the sleeve is point-like, which is why the end surface (22) of the sleeve pin (19) is provided.
The centrifugal speed governor according to claim 2, wherein is formed in a spherical segment shape. 4. The centrifuge according to claim 3, wherein the guide sleeve (14) is integrally formed at the bottom thereof with a recess such as a ball cutout for receiving the end surface (22) of the sleeve pin (19). Speed governor.