An oil injection pump assembly and an engine

Abstract

The utility model relates to the technical field of engine, specifically disclose a kind of fuel injection pump assembly and engine, fuel injection pump assembly includes pump body, first bearing, second bearing, support piece and camshaft, wherein, the inner ring of first bearing and the inner ring of second bearing are fixedly sleeved in camshaft, the outer ring of first bearing and the outer ring of second bearing are fixedly installed in pump body, support piece is installed in pump body, and support piece is located between first bearing and second bearing, support piece has arc support groove, and the inner wall of support groove is attached with the outer periphery of camshaft.The camshaft of the fuel injection pump assembly is formed three-point support by first bearing, second bearing and support piece, can guarantee the stability of camshaft support;In addition, support piece can only surround a part in the circumferential direction of camshaft, can effectively reduce the contact area and friction work between camshaft and support piece, is favorable for the full lubrication and heat dissipation of camshaft, and avoid stress concentration, to prolong the service life of camshaft.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a fuel injection pump assembly and an engine. Background Technology

[0002] In existing solutions, the camshaft of the fuel injection pump is usually supported by bearing bushes. For example, a previous patent application with application number CN202011059132.3 disclosed a combined common rail fuel injection pump for a high-speed diesel engine. The camshaft of this fuel injection pump is supported by three sets of bearing bushes. The bearing bushes completely surround the camshaft, which results in a thin lubricating oil film between the camshaft and the supporting bearing bushes. This makes it prone to failure due to excessive friction. In addition, it is also prone to stress concentration, which can cause damage to the camshaft or bearing bushes. Utility Model Content

[0003] The purpose of this invention is to provide a fuel injection pump assembly and engine to ensure the lubrication effect of the camshaft and reduce the friction force on the camshaft, thereby preventing damage to the camshaft.

[0004] On one hand, this utility model provides a fuel injection pump assembly, which includes:

[0005] The system includes a pump body, a first bearing, a second bearing, a support member, and a camshaft. The inner rings of the first bearing and the second bearing are both fixedly fitted onto the camshaft. The outer rings of the first bearing and the second bearing are both fixedly installed on the pump body. The support member is installed on the pump body and is located between the first bearing and the second bearing. The support member has an arc-shaped support groove, and the inner wall of the support groove is in contact with the outer peripheral surface of the camshaft.

[0006] As a preferred technical solution for the fuel injection pump assembly, the camshaft includes multiple cams, the pump body is provided with multiple pump chambers, and the fuel injection pump assembly also includes multiple fuel supply components, which are respectively disposed in the multiple pump chambers, and the multiple cams are respectively connected to the multiple fuel supply components in a transmission connection.

[0007] As a preferred technical solution for the fuel injection pump assembly, the fuel supply component includes:

[0008] A plunger sleeve is rotatably disposed in the pump chamber. The plunger sleeve is provided with a high-pressure oil chamber, a plunger cavity communicating with the high-pressure oil chamber, and a low-pressure oil inlet passage communicating with the high-pressure oil chamber.

[0009] An oil outlet valve assembly is located at the oil outlet of the high-pressure oil chamber;

[0010] A plunger is slidably disposed in the plunger cavity, and the top end of the plunger can extend into or retract from the high-pressure oil cavity, while the bottom end of the plunger is located outside the plunger cavity;

[0011] The roller body abuts against the bottom end of the plunger, and the roller body is slidably connected to the pump body;

[0012] A roller is rotatably disposed on the roller body, and the outer peripheral surface of the roller abuts against the outer peripheral surface of the corresponding cam;

[0013] A plunger spring is sleeved on the plunger, and the plunger spring is used to press the plunger against the roller body.

[0014] As a preferred technical solution for the fuel injection pump assembly, the roller is drum-shaped, and the outer diameter of the roller gradually decreases from the middle to both ends.

[0015] As a preferred technical solution for the fuel injection pump assembly, a first connecting oil passage is provided between any two adjacent pump chambers of the pump body;

[0016] The outer diameter of the plunger is adapted to the inner diameter of the plunger cavity, and the plunger sleeve is provided with a mixed oil return channel, which is connected to the plunger cavity and the first connecting channel respectively.

[0017] The fuel injection pump assembly also includes a mixed oil return connector, which is connected to one of the mixed oil return passages.

[0018] As a preferred technical solution for the fuel injection pump assembly, the mixed oil return passage includes a first annular oil reservoir disposed on the inner wall of the plunger cavity, a second annular oil reservoir disposed on the outer circumferential surface of the plunger sleeve, and a first intermediate oil passage connecting the first annular oil reservoir and the second annular oil reservoir.

[0019] As a preferred technical solution for the fuel injection pump assembly, the fuel injection pump assembly further includes a low-pressure fuel connector disposed on the pump body, the low-pressure fuel connector being connected to one of the low-pressure fuel inlet passages;

[0020] A second connecting oil passage is provided between any two adjacent pump chambers of the pump body. The second connecting oil passage is located above the first connecting oil passage, and each low-pressure oil inlet passage is connected to the corresponding second connecting oil passage.

[0021] As a preferred technical solution for the fuel injection pump assembly, the plunger sleeve is further provided with a clean oil return passage, which is connected to the plunger cavity and the corresponding second connecting passage. The clean oil return passage is located below the low-pressure inlet passage and above the mixed oil return passage.

[0022] As a preferred technical solution for the fuel injection pump assembly, the support groove is semi-circular; and / or,

[0023] The first bearing is a self-aligning bearing, and the second bearing is a cylindrical roller bearing.

[0024] The fuel injection pump assembly provided by this utility model has at least the following beneficial effects:

[0025] The fuel injection pump assembly includes a pump body, a first bearing, a second bearing, a support member, and a camshaft. The inner rings of both the first and second bearings are fixedly fitted onto the camshaft, while the outer rings of both bearings are fixedly mounted on the pump body. The support member is mounted on the pump body and positioned between the first and second bearings. The support member has an arc-shaped support groove, the inner wall of which fits against the outer circumferential surface of the camshaft. The camshaft of this fuel injection pump assembly is supported at three points by the first bearing, the second bearing, and the support member, ensuring the stability of the camshaft support. Furthermore, because the support groove of the support member is arc-shaped, the support member only surrounds a portion of the camshaft's circumference. This effectively reduces the contact area between the camshaft and the support member, which is beneficial for camshaft lubrication and reduces frictional work. It also facilitates camshaft heat dissipation, avoids stress concentration, and extends the camshaft's service life.

[0026] On the other hand, this utility model provides an engine, which includes a crankshaft and any of the above-described fuel injection pump assemblies, wherein the crankshaft is drivenly connected to the camshaft.

[0027] The engine provided by this utility model has at least the following beneficial effects:

[0028] The engine includes a crankshaft and the aforementioned fuel injection pump assembly, with the crankshaft being drivenly connected to the camshaft. In the fuel injection pump assembly of this engine, the camshaft is adequately lubricated, reducing frictional work and extending its service life. Attached Figure Description

[0029] Figure 1 This is a first cross-sectional view of the fuel injection pump assembly in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the support component of the fuel injection pump assembly in an embodiment of this utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the roller and roller body of the fuel injection pump assembly in this embodiment of the present invention;

[0032] Figure 4 This is a cross-sectional view of a partial structure of the fuel injection pump assembly in an embodiment of this utility model;

[0033] Figure 5 This is a second cross-sectional view of the fuel injection pump assembly in an embodiment of the present invention.

[0034] In the picture:

[0035] 1. Pump body; 101. Pump chamber; 102. First connecting oil passage; 103. Main return oil passage; 104. Second connecting oil passage;

[0036] 2. First bearing; 3. Second bearing;

[0037] 4. Support components; 401. Support groove;

[0038] 5. Camshaft; 501. Cam;

[0039] 6. Plunger sleeve; 601. High-pressure oil chamber; 602. Plunger chamber; 603. Low-pressure oil inlet passage; 604. First annular oil reservoir; 605. First intermediate oil passage; 606. Second annular oil reservoir; 607. Third annular oil reservoir; 608. Second intermediate oil passage; 609. Fourth annular oil reservoir;

[0040] 7. Delivery valve assembly; 8. Plunger; 9. Roller body; 10. Roller; 11. Plunger spring; 12. Mixed oil return connector; 13. Low-pressure fuel connector; 14. First sealing ring; 15. Second sealing ring; 16. Third sealing ring; 17. Governor. Detailed Implementation

[0041] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0045] In the existing design, the camshaft of the fuel injection pump is supported by three sets of bearings. The bearings completely surround the camshaft, which results in a thin lubricating oil film between the camshaft and the supporting bearings. This makes it prone to failure due to excessive friction. In addition, it can also easily lead to stress concentration, causing damage to the camshaft or bearings.

[0046] In response, this embodiment provides a fuel injection pump assembly to solve the above-mentioned problems.

[0047] Specifically, please refer to Figure 1 The fuel injection pump assembly includes a pump body 1, a first bearing 2, a second bearing 3, a support member 4, and a camshaft 5. The inner rings of the first bearing 2 and the second bearing 3 are both fixedly fitted onto the camshaft 5, while the outer rings of both bearings are fixedly mounted on the pump body 1. The support member 4 is mounted on the pump body 1 and positioned between the first bearing 2 and the second bearing 3. The support member 4 has an arc-shaped support groove 401, the inner wall of which fits against the outer circumferential surface of the camshaft 5. The camshaft 5 of this fuel injection pump assembly is supported at three points by the first bearing 2, the second bearing 3, and the support member 4, ensuring the stability of the camshaft 5. Furthermore, because the support groove 401 of the support member 4 is arc-shaped, the support member 4 can only surround a portion of the camshaft 5 in the circumferential direction. This effectively reduces the contact area between the camshaft 5 and the support member 4, which is beneficial for the lubrication of the camshaft 5 and reduces frictional work. It also facilitates heat dissipation from the camshaft 5, avoids stress concentration, and extends the service life of the camshaft 5.

[0048] Alternatively, please refer to Figure 2 The support groove 401 of the support member 4 is positioned with its opening facing upwards. In other embodiments, the opening direction of the support groove 401 of the support member 4 can also be set according to actual needs.

[0049] Alternatively, please refer to Figure 2 The support groove 401 is semi-circular, meaning the central angle of the support groove 401 is 180°, which facilitates installation and ensures a large support range for the camshaft 5. In other embodiments, the central angle of the support groove 401 can also be set to less than 180° as needed.

[0050] Optionally, the first bearing 2 is a self-aligning bearing, and the second bearing 3 is a cylindrical roller bearing. In other embodiments, the first bearing 2 and the second bearing 3 may also be configured as other types of bearings as needed.

[0051] Alternatively, please refer to Figure 1 The camshaft 5 includes multiple cams 501, the pump body 1 has multiple pump chambers 101, and the fuel injection pump assembly also includes multiple fuel supply components, which are correspondingly arranged in the multiple pump chambers 101. The multiple cams 501 are connected to the multiple fuel supply components in a corresponding manner. With this configuration, the camshaft 5 can simultaneously drive multiple fuel supply components to supply fuel to multiple cylinders in a corresponding manner. The number of cams 501, the number of fuel supply components, and the number of pump chambers 101 are all equal, and these numbers can be set according to the actual number of cylinders in the engine. In this embodiment, an exemplary scheme is provided where the number of cams 501, the number of fuel supply components, and the number of pump chambers 101 are all six.

[0052] Alternatively, please refer to Figure 1The oil supply assembly includes a plunger sleeve 6, an oil outlet valve assembly 7, a plunger 8, a roller body 9, a roller 10, and a plunger spring 11. A plunger sleeve 6 is rotatably disposed within a pump chamber 101. The plunger sleeve 6 is provided with a high-pressure oil chamber 601, a plunger cavity 602 communicating with the high-pressure oil chamber 601, and a low-pressure oil inlet passage 603 communicating with the high-pressure oil chamber 601. An oil outlet valve assembly 7 is disposed at the oil outlet of the high-pressure oil chamber 601. A plunger 8 is slidably disposed within the plunger cavity 602, and the top end of the plunger 8 can extend into or retract from the high-pressure oil chamber 601, while the bottom end of the plunger 8 is located outside the plunger cavity 602. A roller body 9 abuts against the bottom end of the plunger 8 and is slidably connected to the pump body 1. A roller 10 is rotatably disposed on the roller body 9, and the outer circumferential surface of the roller 10 abuts against the outer circumferential surface of the corresponding cam 501. A plunger spring 11 is sleeved on the plunger 8 and is used to press the plunger 8 against the roller body 9. The delivery valve assembly 7 can open or close under oil pressure. When the camshaft 5 rotates and moves upward, each cam 501 contacts the corresponding roller 10 and pushes the roller 10 to drive the roller body 9 to move upward, thereby causing the plunger 8 to pressurize the fuel in the high-pressure oil chamber 601. When the oil pressure exceeds the preset value, the delivery valve assembly 7 can open, and the oil is delivered to the injector through the delivery valve assembly 7. The injector then injects the fuel into the combustion chamber of the cylinder to participate in the combustion reaction. When the cam 501 moves downward, under the action of the plunger spring 11, the plunger 8 is always in contact with the roller body 9, and the roller 10 is always in contact with the cam 501. At this time, the plunger 8 gradually withdraws from the high-pressure oil chamber 601, and the fuel in the low-pressure oil inlet passage 603 can enter the high-pressure oil chamber 601 to prepare for the next pumping cycle.

[0053] It should be noted that the oil outlet valve assembly 7 is a mature component in the prior art. It can open when the oil pressure exceeds the preset value and remain closed when the oil pressure is less than the preset value. The specific structure of this embodiment will not be described in detail.

[0054] Alternatively, please refer to Figure 3 Please refer to Figure 10, which is drum-shaped, and the outer diameter of roller 10 gradually decreases from the middle to both ends. This design enables roller 10 to have geometric self-adaptive capability, which is beneficial for load distribution and dynamic lubrication optimization. Under high speed or heavy load conditions, it can effectively suppress centrifugal force, inertial impact, thermal deformation and force deformation.

[0055] Alternatively, please refer to Figure 1 , Figure 4 and Figure 5A first connecting oil passage 102 is provided between any two adjacent pump chambers 101 of the pump body 1; the outer diameter of the plunger 8 is adapted to the inner diameter of the plunger cavity 602, and the plunger sleeve 6 is provided with a mixed oil return passage, which is connected to the plunger cavity 602 and the first connecting oil passage 102 respectively; the fuel injection pump assembly also includes a mixed oil return connector 12, which is connected to one of the mixed oil return passages. This configuration ensures that fuel leaking from the gap between the plunger 8 and the plunger sleeve 6 in each high-pressure oil chamber 601 is collected through the mixed oil return passage and each of the first connecting oil passages 102 to the mixed oil return connector 12. The fuel is then transported to the outside of the injection pump assembly for collection and recycling, reducing energy consumption. It also prevents fuel leaking from the gap between the plunger 8 and the plunger sleeve 6 from leaking into the chamber where the camshaft 5 is located, thus preventing oil dilution and abnormal wear of the camshaft 5, roller 10, and roller body 9, significantly improving the service life of the injection pump assembly. Preferably, please refer to... Figure 4 The mixed oil return connector 12 is connected to one of the mixed oil return channels via the main return channel 103 provided on the pump body 1.

[0056] Alternatively, please refer to Figure 5 The mixed oil return passage includes a first annular oil reservoir 604 disposed on the inner wall of the plunger cavity 602, a second annular oil reservoir 606 disposed on the outer circumferential surface of the plunger sleeve 6, and a first intermediate oil passage 605 connecting the first annular oil reservoir 604 and the second annular oil reservoir 606. Specifically, the main return passage 103 is connected to the second annular oil reservoir 606 of one of the mixed oil return passages. When fuel leaking from the gap between the plunger 8 and the plunger sleeve 6 flows downward, it can be stored in the first annular oil reservoir 604 as it flows through it, and then flow into the second annular oil reservoir 606 through the first intermediate oil passage 605, and is discharged through the main return passage 103 via the mixed oil return connector 12. In addition, due to the damping effect of the gap between the plunger 8 and the plunger sleeve 6, the pressure of the leaked fuel after flowing through the first annular oil reservoir 604 has been reduced, which can prevent further downward leakage.

[0057] Alternatively, please refer to Figure 5 The fuel injection pump assembly also includes a low-pressure fuel connector 13 disposed on the pump body 1, which is connected to one of the low-pressure fuel inlet passages 603. A second connecting passage 104 is also disposed between any two adjacent pump chambers 101 of the pump body 1, located above the first connecting passage 102. Each low-pressure fuel inlet passage 603 is connected to a corresponding second connecting passage 104. With this configuration, low-pressure fuel enters one of the low-pressure fuel inlet passages 603 through the low-pressure fuel connector 13, and is then distributed to each low-pressure fuel inlet passage 603 through each of the second connecting passages 104 to supply fuel to each fuel supply component.

[0058] Alternatively, please refer to Figure 5 The plunger sleeve 6 is also provided with a clean oil return passage, which is connected to the plunger cavity 602 and the corresponding second connecting passage 104. The clean oil return passage is located below the low-pressure inlet passage 603 and above the mixed oil return passage. By providing the clean oil return passage, fuel leaking downward from the high-pressure oil cavity 601 can be recycled back to the low-pressure inlet passage 603 when flowing through the clean oil return passage, reducing fuel waste. Preferably, the clean oil return passage includes a third annular oil reservoir 607 disposed on the inner wall of the plunger cavity 602, a fourth annular oil reservoir 609 disposed on the outer circumferential surface of the plunger sleeve 6, and a second intermediate oil passage 608 connecting the third annular oil reservoir 607 and the fourth annular oil reservoir 609. The fourth annular oil reservoir 609 is connected to the second connecting passage 104.

[0059] Alternatively, please refer to Figure 5 The fuel injection pump assembly also includes a first sealing ring 14. A first sealing ring 14 is provided between each clean oil return passage and the mixed oil return passage directly below it. The first sealing ring 14 is located between the plunger sleeve 6 and the cavity wall of the pump chamber 101. By providing the first sealing ring 14, fuel leakage can be further reduced.

[0060] Alternatively, please refer to Figure 5 The fuel injection pump assembly also includes a second sealing ring 15. A second sealing ring 15 is provided below each mixed oil return passage. The second sealing ring 15 is located between the plunger sleeve 6 and the cavity wall of the pump chamber 101. By setting the second sealing ring 15, fuel can be further prevented from entering the cavity where the camshaft 5 is located.

[0061] Alternatively, please refer to Figure 1 The fuel injection pump assembly also includes a third sealing ring 16. A third sealing ring 16 is provided above each clean oil return passage. The third sealing ring 16 is located between the plunger sleeve 6 and the cavity wall of the pump chamber 101. By providing the second sealing ring 15, fuel leakage can be further prevented.

[0062] Alternatively, please refer to ​ The fuel injection pump assembly also includes a governor 17 disposed on the pump body 1. The governor 17 is used to adjust the phase angle of each plunger sleeve 6, thereby controlling the amount of fuel injected. The governor 17 is an existing mature component, and its specific structure will not be described in detail in this embodiment.

[0063] This embodiment also provides an engine, which includes a crankshaft and the aforementioned fuel injection pump assembly, with the crankshaft and camshaft 5 being drivenly connected. The crankshaft and camshaft 5 can be drivenly connected via a chain drive assembly or a gear drive assembly. In the fuel injection pump assembly of this engine, the camshaft 5 can be adequately lubricated, reducing the frictional work of the camshaft 5 and extending its service life.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A fuel injection pump assembly, characterized in that, The pump body includes a pump body (1), a first bearing (2), a second bearing (3), a support member (4), and a camshaft (5). The inner rings of the first bearing (2) and the second bearing (3) are fixedly fitted onto the camshaft (5). The outer rings of the first bearing (2) and the second bearing (3) are fixedly installed on the pump body (1). The support member (4) is installed on the pump body (1) and is located between the first bearing (2) and the second bearing (3). The support member (4) has an arc-shaped support groove (401), and the inner wall of the support groove (401) is in contact with the outer peripheral surface of the camshaft (5).

2. The fuel injection pump assembly according to claim 1, characterized in that, The camshaft (5) includes multiple cams (501), the pump body (1) is provided with multiple pump chambers (101), and the fuel injection pump assembly also includes multiple fuel supply components. The multiple fuel supply components are arranged in the multiple pump chambers (101) in a one-to-one correspondence, and the multiple cams (501) are connected to the multiple fuel supply components in a one-to-one correspondence transmission connection.

3. The fuel injection pump assembly according to claim 2, characterized in that, The oil supply assembly includes: A plunger sleeve (6) is rotatably disposed in the pump chamber (101). The plunger sleeve (6) is provided with a high-pressure oil chamber (601), a plunger chamber (602) communicating with the high-pressure oil chamber (601), and a low-pressure oil inlet passage (603) communicating with the high-pressure oil chamber (601). An oil outlet valve assembly (7) is disposed at the oil outlet of the high-pressure oil chamber (601); A plunger (8) is slidably inserted into the plunger cavity (602), and the top end of the plunger (8) can extend into or exit the high-pressure oil cavity (601), while the bottom end of the plunger (8) is located outside the plunger cavity (602). The roller body (9) abuts against the bottom end of the plunger (8), and the roller body (9) is slidably connected to the pump body (1); A roller (10) is rotatably disposed on the roller body (9), and the outer peripheral surface of the roller (10) abuts against the outer peripheral surface of the corresponding cam (501); A plunger spring (11) is sleeved on the plunger (8), and the plunger spring (11) is used to press the plunger (8) against the roller body (9).

4. The fuel injection pump assembly according to claim 3, characterized in that, The roller (10) is drum-shaped, and the outer diameter of the roller (10) gradually decreases from the middle to both ends.

5. The fuel injection pump assembly according to claim 3, characterized in that, A first connecting oil passage (102) is provided between any two adjacent pump chambers (101) of the pump body (1); The outer diameter of the plunger (8) is adapted to the inner diameter of the plunger cavity (602), and the plunger sleeve (6) is provided with a mixed oil return channel, which is connected to the plunger cavity (602) and the first connecting channel (102) respectively. The fuel injection pump assembly also includes a mixed oil return connector (12), which is connected to one of the mixed oil return passages.

6. The fuel injection pump assembly according to claim 5, characterized in that, The mixed oil return passage includes a first annular oil reservoir (604) disposed on the inner wall of the plunger cavity (602), a second annular oil reservoir (606) disposed on the outer circumferential surface of the plunger sleeve (6), and a first intermediate oil passage (605) connecting the first annular oil reservoir (604) and the second annular oil reservoir (606).

7. The fuel injection pump assembly according to claim 5, characterized in that, The fuel injection pump assembly also includes a low-pressure fuel connector (13) disposed on the pump body (1), the low-pressure fuel connector (13) being connected to one of the low-pressure fuel inlet passages (603); A second connecting oil passage (104) is provided between any two adjacent pump chambers (101) of the pump body (1). The second connecting oil passage (104) is located above the first connecting oil passage (102). Each low-pressure oil inlet passage (603) is connected to the corresponding second connecting oil passage (104).

8. The fuel injection pump assembly according to claim 7, characterized in that, The plunger sleeve (6) is also provided with a clean oil return channel, which is connected to the plunger cavity (602) and the corresponding second connecting channel (104) respectively. The clean oil return channel is located below the low-pressure inlet channel (603) and above the mixed oil return channel.

9. The fuel injection pump assembly according to any one of claims 1-8, characterized in that, The support groove (401) is semi-circular; and / or, The first bearing (2) is a self-aligning bearing, and the second bearing (3) is a cylindrical roller bearing.

10. An engine, characterized in that, It includes a crankshaft and an injection pump assembly according to any one of claims 1-9, wherein the crankshaft is drive-connected to the camshaft (5).

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