KR890001624B1 - Centrifugal governor for internal combustion engine - Google Patents

Abstract

The centrifugal governor includes a sensor lever (40) adapted to engage a cam surface portion (39) of a torque cam (32) determining a starting fuel increment at the start of the engine to displace the control rack (27) into a fuel increasing position. A cancelling spring (37) is interposed between the torque cam and the tension lever (10) and urges the torque cam with a force dependent upon the angularity of the tension lever in a direction disengaging the sensor lever from the cam surface portion for interrupting the starting fuel increasing action of the governor. When the engine is in a starting condition a biaser forcibly displaces the torque cam against the urging force of the cancelling spring to predetermined position.

Description

Centrifugal governor of internal combustion engine

1 is a perspective view showing the internal configuration of a centrifugal governor according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view detailing the engaged state of the torque cam and the sensor lever of FIG.

3 is a cross-sectional view taken along line III-III of FIG.

* Explanation of symbols for main parts of the drawings

2: Fly Weight 10: Tension Lever

27: control rack 32: torque cam

35: torque camshaft 37: canvas spring

38: cam surface 39: cam surface portion

40: sensor lever 52: lever

54: actuator 54a: solenoid

54b: movable core

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal governor of a fuel injection pump for use in an internal combustion engine such as a diesel engine, and more particularly, to a centrifugal governor having an improved function of weighing fuel aromas supplied to an engine when the engine is started.

Conventionally, a control rack that controls the amount of fuel supplied to an engine, a flyweight that expands in accordance with the rotational speed of the engine, a tension lever that swings around a fixed shaft by the expansion of the flyweight, A torque cam having an idling spring for pressing the tension lever against expansion, a cam surface including a cam surface portion for defining a starting fuel weight value at the time of starting the engine; A sensor lever that connects to the control rack and engages the other end with the cam face of the torque cam. The sensor lever engages the above-mentioned bar cam face of the torque cam when the engine starts to displace the kentrol rack to the starting fuel weight position. If it is installed, it is interposed between the torque cam and the tension lever and presses the torque cam with the pressing force according to the swing angle of the tension lever. The cancel spring and the control lever which rotates and release the sensor lever engaged with the cam face of the torque cam, and the artificial lever of this control lever are interlocked and one end is tensioned through the guide lever via the guide lever. A centrifugal governor, which is a floating lever connected to the lever, is known, for example, from Japanese Patent Application No. 59-7814. This type of centrifugal governor rotates the control lever to the full speed position to start the engine and causes the flow lever to rotate about its guide lever side end to displace the control rack to the starting fuel weight position. At the same time, the tension lever is also rotated to rotate the torque cam to control the amount of starting fuel.However, since the torque cam moves slowly due to the rotation of the tension lever depending on the link resistance, the sensor lever connected to the control rack has the weight of the starting fuel weight of the torque cam. Engagement with the cam surface allows the displacement of the control rack to the starting fuel weight position. However, in such a conventional structure, especially in a state where the viscosity of the lubricating oil, such as a cool air at an ambient temperature of -20 to 40 ° C, becomes high, the fuel increase direction of the control rack by pressing the accelerator pedal when starting the engine vigorously. The speed of pushing out is slow and accordingly, the movement of the sensor lever becomes slow and the torque cam rotates quickly as the sensor lever is engaged with the cam surface of the torque cam. It does not fit on the face, which makes the startability worse. In addition, even when the control rack is pulled back to the fuel sense position with the stop lever and stopped while it is turned back, the tip of the sensor lever is difficult to engage with the cam face of the torque cam. Startability deteriorates.

It is an object of the present invention to ensure that the sensor lever can be reliably engaged with the cam face for increasing fuel of the torque cam even when starting in a state where the oil viscosity is high, such as during cold cooling, thereby improving engine startability. To provide a centrifugal governor of an internal combustion engine.

According to the present invention, the torque cam is forcibly rotated at a predetermined position in which the cam cam portion of the torque cam is engaged with the sensor lever by resisting the pressing force of the cancel spring when the engine is started. A centrifugal governor provided with knitting means held in that position can be provided. Preferably, the knitting unit described above is constituted by means for rotating the support shaft of the torque cam by moving according to the starting operation of the engine, and means for transmitting the rotation of the support shaft to the torque cam, and causing it to rotate at a predetermined position.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

狀)하단부 사이에 회동이 자유롭도록 부착되었으며, 이 텐션레버(10)는 그 중간부의 핀(11)을 받침점으로 하며요동할 수 있는 것으로, 이 핀(11)은 하우징(6a)일부를 구성하는 또다른 측벽부에 지지되어 있다. 따라서 텐션레버(10)는 플라이웨이트(2)의 확개에 따라서 슬리이브(4) 및 시프터(5)를 개재하여 핀(11)을 받침점으로 하여 요동할 수 있도록 되어 있음과 동사에 아이들스프링(8)에 의하여 플라이웨이트(2)의 확개에 저항하는 방향으로 가압되어 있다. 텐션레버(10)의 두가닥 형상 상단부 상이에는 가동(可動)스프링이와서(12)가 핀(13a), (13b)을 개재하여 회동이 자유롭도록 장착되어 있다.가동스프링와셔(12)의 중심구멍에는 조속기축(14)의 일단부에 돌설된 고정스프링와서(15)와 가동스프링와셔(12)와의 사이에는 코일스프링으로 된 조속기스프링(16)이 장착되어 조속기축(14)에 끼운 상태로 장착하였고, 이 조속기스프링(16)에 의하여 텐션레버(10)가 도면중 시계방향으로 가압되어 있다.1 shows the configuration of a centrifugal governor of a fuel injection pump according to an embodiment of the present invention, in which (1) is a camshaft of a fuel injection pump which rotates synchronously with an internal combustion engine (not shown). The flyweight 2 is attached to the through 3 through the pin 3, and the flyweight 2 is expanded as the engine speed increases. In accordance with the expansion of the flyweight 2, the sleeve 4 is pressurized to the right in the drawing, and the sleeve 4 has a shifter 5 through a thrust bearing (not illustrated). An idle spring (8) was mounted between the shifter (5) and the idle set bolt (7) screwed to the side wall of the housing (6a), and the idle spring (8). Accordingly, the shifter 5 is pressed to the left in the figure. The shifter 5 is a pin 9 and has a double strand shape of the tension lever 10.

狀) It is attached freely between the lower ends, and the tension lever 10 is able to swing with the pin 11 of the middle part as a supporting point, and this pin 11 forms part of the housing 6a. It is supported by another side wall part. Therefore, the tension lever 10 is able to oscillate with the pin 11 as a supporting point via the sleeve 4 and the shifter 5 as the flyweight 2 is expanded. Is pressed in a direction that resists the expansion of the flyweight 2. On the two-stranded upper end of the tension lever 10, a movable spring 12 is mounted so as to be free to rotate through the pins 13a and 13b. The center of the movable spring washer 12 is provided. In the hole, a governor spring 16 made of a coil spring is mounted between the fixed spring washer 15 and the movable spring washer 12 protruding from one end of the governor shaft 14, and is fitted to the governor shaft 14. The tension lever 10 is pressed clockwise in the figure by the governor spring 16.

The lower end of the guide lever 17 is provided on the rotation support point pin 11 of the tension lever 10 so as to be free to rotate to the support point, and the guide lever 17 is wound on the pin 11. In accordance with the spring (18) is attached to the counterclockwise in the figure is joined to the tension lever 10 is to move.

止體)(30)에 걸려 고정되어 있다.On the other hand, the control lever 19, which is located on the outer side of the upper wall portion 6b of the housing and is linked to the step of stepping on the accelerator pedal which is not shown in the figure, penetrates freely through the upper wall portion 6b. The L-shaped lever 21 is connected to the control lever 19 so as to move together through the 20, and the L-shaped lever 21 is connected to the pin 20 via the return spring 22. The support lever 23 pivoting around the center is pressed and engaged, and is usually intended to have the same movement as the control lever 19. The supporting lever 23 is mounted so that the intermediate part of the floating lever 24 can be freely rotated by the pin 25, and the guide lever 17 is formed in the engaging groove 24a formed at one end of the floating lever 24. The pin 26 provided at the upper end of the fitting is fitted. Moreover, the pin 28 provided in the base end 27a of the control rack 27 is fitted in the engaging groove 24b formed in the other end of the floating lever 24, and is fitted to the rotation angle of the control lever 19. Therefore, the control rack 27 moves forward and backward to increase and decrease the fuel supply amount. Furthermore, one end of the star art lever 29 which presses the control rack 27 to the left side in the drawing, that is, to increase the fuel supply amount, is connected to the proximal end 27a of the control rack 27. The other end of the 29 is a hook provided on the side wall of the housing 6

The hook 30 is fixed.

A spring washer 31 protrudes from one pin 13a of the tension lever 10, and one end of the spring washer 31 rotates freely with the torque cam 32 by the pin 33. The other end of the mounted rod 34 is inserted so that sliding is free. The torque cam 32 is disposed so as to swing freely around the torque cam shaft 35 below the rod 34, and is provided on the spring washer 36 and the pin 13a provided at one end of the rod 34. A cancel spring 37 is interposed between the prepared spring washer 31, and the cancel spring 37 applies a torque cam 32 counterclockwise in the figure. The torque cam 32 has a cam surface 38 on its outer circumferential surface, and the cam surface 38 includes a notch-shaped starting fuel weight positioning cam surface portion 39 at its lower end, and on this cam surface portion 39a, a sensor The hook-shaped hook 40a formed at the lower end of the lever 40 is hooked or hooked freely.

The sensor lever 40 is supported by the pin 41 and the bracket 42 so that its intermediate part is freely swingable, and the bracket 40 is fixed to the side wall of the housing 6 with the pin 43. . In the substantially U-shaped engaging groove 44 formed at the upper end of the sensor lever 40, the pin 45 protruding to the side of the control rack 27 is fitted so as to swing freely. Moreover, the first set 46 is a full set bolt, and 47 is an idling set bolt, and these set bolts 46 and 47 are coupled to restrict the maximum rotation range of the control lever 19. 48 is a full load set lever, which is supported by the device pin 43 of the bracket 42 to determine the maximum displacement position of the control rack 27 when it is being charged by the set bolt 49 of the charge. Set. Furthermore, in the figure of the governor shaft 14, the right end has a screw part, and this screw part has the fixed spring washer 15 by moving and adjusting the governor shaft 14 in the axial direction by operation from the outside of the housing wall part 6a. A guide screw 50 and a knit 51 for setting the position of the screw are screwed.

The configuration described above is the same as in the prior art.

According to the present invention, the torque cam shaft 35 supporting the torque cam 32 so as to be free to rotate is supported on the side wall 6c of the housing 6 so as to be free to rotate as shown in FIG. One end of the torque cam 35 penetrates through the side wall 6c of the housing 6 and extends outward, and one end of the lever 52 is fixed to the extended end. The other end of the lever 52 is an actuator 54 formed of, for example, a solenoid 54a and a movable core 54 via a wire connecting mechanism 53. As the movable core 54b connected to the wire 53 moves in the axial direction, the torque cam shaft 35 is rotated in the clockwise direction through the coupling mechanism 53 and the lever 52 to maintain a constant circumferential position. It is supposed to be.

A transmission mechanism 56 for transmitting the rotational force of the torque cam shaft 35 to the torque cam 32 is provided between the torque cam 32 and the torque cam shaft 35. The transmission mechanism 56 is located at a side of the torque cam 32 which is different from the inner side of the side wall 6c of the housing 6 and the torque cam 32, protruding from one side of the torque cam 32. The connecting arm 58 is fixed to the camshaft 35, and the other end of the connecting arm 58 extends below the connecting pin 57 as shown in FIGS. 2 and 3. Therefore, when the torque cam shaft 35 rotates in the clockwise direction in the drawing, the connecting arm 58 abuts against the connecting pin 57, so that the torque cam 32 is interposed between the connecting arm 58 and the connecting pin 57. ), The rotational force of the torque cam shaft 35 is transmitted, and the torque cam 32 rotates clockwise in FIG. 2. The solenoid 54a of the actuator 54 is electrically connected to the key switch K and the battery B of the internal combustion engine via the timer T. Then, the actuator 54 is operated at the on position when this key switch is operated in the order of A.C.C to star art in the off position. Furthermore, in the ACC position, the power supply from the vehicle's electric battery is started, and in the StarArt position, the start-up motors of the engine are started respectively. Furthermore, the key switch K is operated to the on position, the timer T starts counting, and the supply of power from the battery to the solenoid starts. After a predetermined time (2-6 seconds), The supply of electric power is interrupted to stop the operation of the actuator 54 so that the holding at the constant circumferential position of the tok cam shaft 35 that resists the additional force of the cancel spring 37 is released.

Next, the operation of the centrifugal governor of the fuel injection pump of the present invention having the above configuration will be described. If the key switch is operated in the on position from the ACC position at the start of the internal combustion engine, the timer starts counting and the actuator 54 starts to operate. The actuator 54 connects the lever 53 and the lever 52. The torque cam shaft 35 is rotated clockwise in the drawing, and the torque cam 32 resists the force of the cancel spring 37 via the transmission mechanism 56 together with the torque cam shaft 35. It is forcibly rotated in the clockwise direction in the drawing to be maintained at a constant circumferential position irrespective of the position of the tension lever 10 so as to rise again as a solid line during the second period. In this state, the engagement portion 40a of the sensor lever 40 can be easily and reliably engaged with the fuel surface cam surface portion 39a of the cam surface 38 of the torque cam 32. have.

In such a state, when the control lever 19 is operated to the full speed position from the idling position by pressing the accelerator pedal hard for starting, the control rack 27 is moved in the fuel increasing direction by the support lever 23. Then, as the sensor lever 4 rotates counterclockwise, the engaging portion 40a at the lower end thereof engages the cam surface portion 39a of the torque cam 32, thereby adjusting the rack position of the electric charge in normal control. The starting fuel increase rack position is obtained, and the internal combustion engine starts when the key switch is operated to the sata art position. Then, when the timer counts up a predetermined time, the power supply of the solenoid of the actuator 54 is stopped in the battery B, and the actuator 54 is stopped. Accordingly, the torque cam resisting the additional force of the cancel spring 37 is thus stopped. In Fig. 32, the holding state at a constant circumferential position is released. After the start of the internal combustion engine, the sensor lever 40 hangs at the starting fuel increase position by receiving the counterclockwise force of the torque cam 32 by the cancel spring 37 while returning the control lever 19 to the idling position. The sensor lever 40 is held in alignment with the starting fuel increase position by receiving the counterclockwise force of the torque chem 32 by the kensel spring 37 while returning the control lever 19 held in alignment to the idling position. When the control lever 19 is returned to the idling position, the support lever 23 is resumed, and the floating lever 24 pulls the control rack 27 in the fuel reduction direction and returns to the cam surface portion 39a of the torque cam 32. At the lower end of the engaging portion 40a of the sensor lever 40, the torque cam 32 is in a state indicated by a two-dot chain line during the second, and the engaging portion 40a of the lower end of the sensor lever 40 is Slip on the cam surface part 39b which is a normal fuel amount position of the torque cam 32 It is in a state of contact. Then, even if the control lever 19 is operated, the starting fuel increase cannot be obtained and the normal governor control operation can be performed. In addition, as the connecting mechanism 53, a link mechanism that is not only wire but other means may be employed as in the above-described embodiment. Alternatively, the torque cam shaft 35 may be directly rotated to a predetermined circumferential position by using a stepper motor or the like as the actuator 54 instead of the embodiment of the illustrated figure.

Moreover, in the above embodiment, the torque choke 32 is configured to support the starting fuel increase position when the key switch K is operated in the on position. However, when the key switch K is operated in the ACC position, the key switch K is operated in the ACC position. The torque cam 32 may be pivotally supported at the starting fuel increase position.

Claims (6)

A control rack 27 for regulating and supplying fuel to the internal combustion engine, a flyweight 2 expanding according to the rotational speed of the engine, and a tension lever 10 and a support shaft swinging according to the degree of expansion of the flyweight 2. A torque cam 32 having a cam surface 38 including a cam surface portion 39 which defines a starting fuel increase value at the time of engine startup and is disposed so as to be freely rotated on the engine, and one end thereof is connected to the control rack 27. The lever 40 and the sensor lever 40 engage the other end with the cam face portion 39 of the torque cam 32 at engine startup to allow the control rack 27 to be displaced to the starting fuel increase position. 32) interposed between the tension lever 10 and in the direction of releasing the engagement between the cam surface portion 39 of the torque cam 32 and the sensor lever 40 at a pressing force corresponding to the swing angle of the tension lever 10. In the centrifugal governor of the internal combustion engine which becomes the cancel spring 37 which presses the torque cam 32, an engine The torque cam 32 is forcibly rotated at a predetermined position allowing the cam face 39 of the torque cam 32 and the sensor lever 40 to be engaged with each other by resisting the pressing force of the cancel spring 37 at the start of the engine. And a centrifugal governor for supporting the torque member 32 in this position for a predetermined period of time with knitting machines. 2. The knitting unit according to claim 1, wherein the knitting means comprises: a shaft rotating means for rotating the shaft 35 of the torque cam 32 in response to an engine starting operation, and rotating the torque cam shaft 35 by the torque cam. The centrifugal governor which consists of rotation transmission means which transmits to 32 and rotates it to a fixed position. The support shaft rotation means comprises a lever 52 having one end fixed to the actuator 54 and the torque cam shaft 35, and a connecting member connecting the other end of the actuator 54 and the lever 52. The rotation transmission means has a connecting arm 58 having a free end fixed to the torque cam shaft 35 and a connecting pin which is protruded on one side of the torque cam 32 so as to contact the connecting arm 58. A centrifugal governor consisting of 57. The centrifugal governor of claim 3, wherein the connection member is made of wire. 4. The centrifugal governor according to claim 3, wherein the actuator (54) is composed of a movable core (54b) connected to the solenoid (54a) and the coupling mechanism (53) and displaced by applying or removing the force of the solenoid (54a). 4. The centrifugal governor according to claim 3, wherein the actuator (54) cooperates with a key switch of the engine.

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