Fuel quantity correction mechanism of fuel injection pump speed regulator

Abstract

The utility model discloses a fuel quantity correcting mechanism of a fuel injection pump speed regulator, which relates to the field of fuel quantity correcting mechanisms, is arranged between a speed regulator rear shell and a speed regulating rocker arm and comprises a fuel quantity adjusting screw rod, the fuel quantity adjusting screw rod penetrates through the speed regulator rear shell and the speed regulating rocker arm, and a correcting nut is screwed on one side of the fuel quantity adjusting screw rod close to the speed regulating rocker arm. The side, close to the speed adjusting rocker arm, of the oil mass adjusting screw rod is sleeved with a gasket, a correction spring is arranged between the gasket and the correction nut, the oil mass adjusting screw rod is sleeved with the correction spring, the oil mass adjusting screw rod is further sleeved with a correction spring seat, the side, close to the correction spring, of the correction spring seat is provided with a correction hole, and the correction spring is arranged in the correction hole. According to the fuel quantity correction mechanism of the fuel injection pump speed regulator, the correction spring can be restrained in the vertical direction, the maximum moving distance of the correction spring is limited, the correction spring can be located in the normal working range all the time, meanwhile, the consistency of spring gaps is guaranteed, and therefore accurate control over the torque is achieved.

Description

Technical Field

[0001] The utility model relates to the field of oil quantity correction mechanisms, in particular to an oil quantity correction mechanism for a fuel injection pump speed regulator. Background Art

[0002] As the performance requirements of diesel engines in applications such as construction machinery and tractors continue to increase, diesel engine speed governor technology is also constantly developing and improving. Among them, mechanical full-range speed governors are widely used due to their simple structure, high reliability and wide adjustment range.

[0003] In a mechanical full-range speed governor, the oil quantity correction mechanism is an important component. Its main purpose is to adjust the oil supply of the injection pump so that the diesel engine can obtain a certain torque reserve when the speed changes, thereby improving the power performance and adaptability of the diesel engine.

[0004] The traditional oil quantity correction mechanism has no clear limit on its moving distance within the normal working range of the correction spring (i.e. no compression and coiling phenomenon occurs and the stiffness remains unchanged). The maximum moving distance of the correction spring is until the correction spring is compressed and coiled. Since it is difficult to make the compression and coiling height of each correction spring consistent, this leads to inconsistency in the maximum moving distance of the oil quantity correction mechanism. This inconsistency manifests itself as poor consistency of maximum torque on the diesel engine, making the torque output of the diesel engine unstable at different speeds, affecting its working performance.

[0005] At the same time, in the process of correcting the spring compression and coiling, the inconsistency of the spring coil gap will cause the stiffness to change. This change in stiffness makes the correspondence between the governor and the diesel engine speed uncertain when it moves in the refueling direction. This uncertainty is manifested in the poor consistency of the diesel engine speed corresponding to the torque on the diesel engine, especially in the medium and low speed range, the direction of the torque is difficult to control. This is undoubtedly a serious problem for applications that require precise control of the maximum torque and the direction of the torque in the medium and low speed range.

[0006] Therefore, in order to solve the above problems and improve the performance of the diesel engine speed governor, it is necessary to improve and optimize the existing oil quantity correction mechanism. Utility Model Content

[0007] The utility model aims to provide an oil quantity correction mechanism for a fuel injection pump speed regulator, which can constrain a correction spring in the vertical direction and limit the maximum moving distance of the correction spring, so that the correction spring is always in a normal working range and the consistency of the spring gap is ensured, thereby realizing precise control of torque.

[0008] The above-mentioned optimized structure of the utility model is realized through the following technical scheme: an oil quantity correction mechanism of an injection pump speed regulator is arranged between the rear shell of the speed regulator and the speed regulating rocker arm, including an oil quantity adjusting screw, the oil quantity adjusting screw passes through the rear shell of the speed regulator and the speed regulating rocker arm, the oil quantity adjusting screw is threadedly provided with a correction nut on the side close to the speed regulating rocker arm, the oil quantity adjusting screw is sleeved with a washer on the side close to the speed regulating rocker arm, a correction spring is arranged between the washer and the correction nut, the correction spring is sleeved on the oil quantity adjusting screw, the oil quantity adjusting screw is also sleeved with a correction spring seat, the correction spring seat is provided with a correction hole on the side close to the correction spring, and the correction spring is arranged in the correction hole.

[0009] In some embodiments, a threaded hole is provided on one side of the correction spring seat close to the correction nut, the threaded hole is coaxially connected to the correction hole, and the diameter of the correction hole is larger than the aperture of the threaded hole.

[0010] In some embodiments, the depth of the correction hole is less than the length of the correction spring.

[0011] In some embodiments, the inner diameter of the correction hole is equal to the outer diameter of the correction spring.

[0012] In some embodiments, the correction spring seat is provided with a flat portion on an outer surface close to the threaded hole.

[0013] In some embodiments, a gap is left between the correction spring seat and the washer.

[0014] In some embodiments, a limiting boss is provided on the oil quantity adjusting screw, and the limiting boss is plugged into and matched with the speed regulating rocker arm. The limiting boss is flush with a side surface of the speed regulating rocker arm close to a correction spring seat and fits with the gasket.

[0015] In some embodiments, the oil quantity adjusting screw is threadedly engaged with the speed regulator rear housing, and a locking nut is provided on a side of the oil quantity adjusting screw close to the speed regulator rear housing.

[0016] In summary, the utility model has the following beneficial effects:

[0017] The oil quantity correction mechanism of the fuel injection pump governor is provided with a sleeve-shaped correction spring seat on the oil quantity adjusting screw to constrain the correction spring in the vertical direction and limit the maximum moving distance of the correction spring, so that the correction spring is always in the normal working range, and the correction spring is avoided from being compressed and coiled, so that the maximum moving distance of the correction spring is unified, the consistency of the maximum torque of the diesel engine is improved, and the stability of the torque output of the diesel engine at different speeds is improved; at the same time, the consistency of the spring gap is ensured, and the precise control of the torque is realized, thereby improving the performance of the diesel engine governor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model.

[0019] In the figure: 1. Speed ​​regulator rear housing; 2. Speed ​​regulating rocker arm; 3. Oil quantity adjustment screw; 4. Correction nut; 5. Washer; 6. Correction spring; 7. Correction spring seat; 8. Locking nut. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] refer to Figure 1 An oil quantity correction mechanism of a fuel injection pump speed regulator includes components such as an oil quantity adjustment screw 3, a correction nut 4, a washer 5, a correction spring 6, a correction spring seat 7 and a locking nut 8. The oil quantity adjustment screw 3 passes through the speed regulator rear housing 1 and the speed regulating rocker arm 2, one end of which is threadedly engaged with the speed regulator rear housing 1 and is provided with a locking nut 8, which can enhance the connection strength between the oil quantity adjustment screw 3 and the speed regulator rear housing 1 and improve the reliability of the entire mechanism; the other end is provided with a correction nut 4, which can limit the maximum moving distance of the correction spring 6.

[0022] A washer 5 is sleeved on the side of the oil quantity adjusting screw 3 close to the speed regulating rocker arm 2, and a correction spring 6 is arranged between the washer 5 and the correction nut 4. The correction spring 6 is sleeved on the oil quantity adjusting screw 3, and a correction spring seat 7 is also sleeved on the oil quantity adjusting screw 3. The correction spring seat 7 is a sleeve structure, including a coaxially connected threaded hole and a correction hole, the diameter of the correction hole is larger than the aperture of the threaded hole, the threaded hole is arranged on the side of the correction spring seat 7 close to the correction nut 4, and the correction spring seat 7 can be fixed on the oil quantity adjusting screw 3 through the threaded connection between the threaded hole and the oil quantity adjusting screw 3; the correction hole is arranged on the side of the correction spring seat 7 close to the correction spring 6, and the correction spring 6 is installed in the correction hole, the inner diameter of the correction hole is equal to the outer diameter of the correction spring 6, and the inner ring of the correction spring 6 fits with the outer surface of the oil quantity adjusting screw 3, which can limit the vertical movement of the correction spring 6, so that the correction spring 6 is always in the normal working range, thereby avoiding the compression and merging phenomenon of the correction spring 6, and at the same time making the maximum moving distance of the correction spring 6 uniform, thereby improving the consistency of the maximum torque of the diesel engine.

[0023] One side of the correction spring 6 is connected to the inner wall of the correction hole, and the other end is connected to the gasket 5. The depth of the correction hole is smaller than the length of the correction spring 6, and a gap is left between the correction spring seat 7 and the gasket 5. By adjusting the size of the gap, the maximum moving distance of the correction spring 6 can be adjusted, thereby reducing the difficulty of controlling the maximum torque of the diesel engine and the torque trend in the medium and low speed areas.

[0024] In some embodiments, the outer surface of the correction spring seat 7 near the threaded hole is provided with a flat portion to improve the tightness between the correction spring seat 7 and the correction nut 4.

[0025] In some embodiments, a limiting boss is provided on the oil quantity adjusting screw 3, and the limiting boss is plugged into and matched with the speed regulating rocker arm 2. The side of the limiting boss close to the correction spring seat 7 is flush with the side of the speed regulating rocker arm 2 and fits with the washer 5. This can increase the flatness of the contact surface between the oil quantity adjusting screw 3, the speed regulating rocker arm 2 and the washer 5, improve the uniformity of force, and thus the stability of the washer 5 during its movement.

[0026] The specific working principle is as follows:

[0027] During operation, as the speed of the diesel engine decreases, the speed rocker arm 2 pushes the washer 5 to move toward the refueling direction of the governor, and the washer 5 pushes the correction spring 6, which is deformed. Since the correction spring 6 is installed in the correction hole, and the aperture of the correction hole is equal to the outer diameter of the correction spring 6, during the deformation of the correction spring 6, the inner wall of the correction hole will constrain the vertical direction of the correction spring 6, avoiding the compression and coiling phenomenon caused by the deformation of the correction spring 6, so that the correction spring 6 is always in the normal working range, ensuring the stability of the diesel engine torque output.

[0028] In summary, the oil quantity correction mechanism of the utility model constrains the correction spring 6 through the correction spring seat 7, so that the correction spring 6 is always in the normal working range, avoiding the compression and coiling phenomenon caused by the deformation of the correction spring 6, and at the same time making the maximum movement distance of the correction spring 6 uniform, ensuring the stability of the torque output of the diesel engine. At the same time, only the gap between the correction spring seat 7 and the washer 5 (L shown in the figure) needs to be adjusted to determine the maximum movement distance of the correction spring 6, thereby reducing the difficulty of controlling the maximum torque of the diesel engine and the torque trend in the medium and low speed areas.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil quantity correction mechanism of a fuel injection pump speed regulator, arranged between a speed regulator rear housing (1) and a speed regulating rocker arm (2), comprising an oil quantity adjustment screw (3), the oil quantity adjustment screw (3) passing through the speed regulator rear housing (1) and the speed regulating rocker arm (2), a correction nut (4) being threadedly connected to a side of the oil quantity adjustment screw (3) close to the speed regulating rocker arm (2), characterized in that: A washer (5) is sleeved on the side of the oil quantity adjusting screw (3) close to the speed regulating rocker arm (2), a correction spring (6) is provided between the washer (5) and the correction nut (4), the correction spring (6) is sleeved on the oil quantity adjusting screw (3), a correction spring seat (7) is also sleeved on the oil quantity adjusting screw (3), a correction hole is provided on the side of the correction spring seat (7) close to the correction spring (6), and the correction spring (6) is provided in the correction hole.

2. The oil quantity correction mechanism of the fuel injection pump speed regulator according to claim 1, characterized in that: A threaded hole is provided on a side of the correction spring seat (7) close to the correction nut (4), the threaded hole is coaxially connected to the correction hole, and the diameter of the correction hole is larger than the aperture of the threaded hole.

3. The oil quantity correction mechanism of the fuel injection pump speed regulator according to claim 2, characterized in that: The depth of the correction hole is smaller than the length of the correction spring (6).

4. The oil quantity correction mechanism of the fuel injection pump speed regulator according to claim 1, characterized in that: The inner diameter of the correction hole is equal to the outer diameter of the correction spring (6).

5. The oil quantity correction mechanism of the fuel injection pump speed regulator according to claim 2, characterized in that: The correction spring seat (7) is provided with a flat portion on its outer surface close to the threaded hole.

6. The oil quantity correction mechanism of the fuel injection pump speed regulator according to claim 1, characterized in that: A gap is left between the correction spring seat (7) and the washer (5).

7. The oil quantity correction mechanism of the fuel injection pump speed regulator according to claim 1, characterized in that: The oil quantity adjustment screw (3) is provided with a limiting boss, the limiting boss is plug-fitted with the speed regulating rocker arm (2), a side of the limiting boss close to the correction spring seat (7) is flush with a side of the speed regulating rocker arm (2), and is in contact with the washer (5).

8. The oil quantity correction mechanism of the fuel injection pump speed regulator according to claim 1, characterized in that: The oil quantity adjustment screw (3) is threadedly engaged with the speed regulator rear housing (1), and a locking nut (8) is provided on a side of the oil quantity adjustment screw (3) close to the speed regulator rear housing (1).

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