Engine oil filling device for high-pressure fuel pump

Abstract

The utility model belongs to the field of high-pressure fuel pumps, and provides a high-pressure fuel pump engine oil filling device which comprises an oil filling base, a steel ball, an ejector rod and a guide base. Wherein a through hole and an oil injection hole communicated with the through hole are formed in the oil injection seat; the steel ball can be pushed out to be assembled in the through hole and is matched with an oil injection channel on a target high-pressure fuel pump in size, and an oil passing groove communicated with the through hole is further formed in the end, close to the steel ball, of the oil injection base. The ejector rod is movably arranged in the through hole in a penetrating mode and used for ejecting the steel ball into the oil injection channel to seal the oil injection channel, and the ejector rod and the inner wall of the through hole are arranged in a spaced mode. The guide seat is hermetically connected to the oil injection seat and forms a guide hole for the ejector rod to penetrate through, and the ejector rod is slidably connected to the inner wall of the guide hole and slidably hermetically connected with the inner wall of the guide hole.

Description

Technical Field

[0001] This application belongs to the field of high-pressure fuel pumps, and particularly relates to a high-pressure fuel pump oil filling device. Background Technology

[0002] As a key component of the internal combustion engine fuel supply system, the high-pressure fuel pump requires pre-lubrication of its internal mechanical structure with engine oil after assembly to maintain lubrication of internal components, reduce frictional losses, and ensure long-term stable operation. In existing technologies, oil filling of the high-pressure fuel pump typically relies on manual tools. The process involves the operator injecting engine oil into the fuel pump's filling channel using a tool such as a fuel nozzle. After filling, additional steps (such as installing a sealing cap or tightening a plug) are taken to seal the filling port to prevent leakage. However, separating the filling and sealing actions leads to low filling efficiency, especially in batch operations where repeatedly disassembling the sealing cap or adjusting the plug significantly extends operation time. Therefore, it is necessary to solve the aforementioned technical problems. Utility Model Content

[0003] The purpose of this application is to provide a high-pressure fuel pump oil filling device to solve the technical problem of low oil filling efficiency of high-pressure fuel pumps in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a high-pressure fuel pump oil filling device, comprising:

[0005] An oil injection seat is formed, which includes a through hole and an oil injection hole communicating with the through hole;

[0006] A steel ball can be ejected and fitted into the through hole and adapted to the size of the fuel injection channel on the target high-pressure fuel pump. The end of the fuel injection seat near the steel ball also forms a fuel passage groove that communicates with the through hole.

[0007] A push rod is movably inserted into the through hole and used to push the steel ball into the oil injection channel to close the oil injection channel. The push rod is spaced apart from the inner wall of the through hole.

[0008] A guide seat is sealed to the oil filling seat and forms a guide hole through which the push rod passes. The push rod is slidably connected to the inner wall of the guide hole and is slidably and sealingly connected to the inner wall of the guide hole.

[0009] An indicator, drivenly connected to a pressure retainer on the target high-pressure fuel pump, is used to detect the amount of fuel injected in real time.

[0010] Optionally, an upper boss coaxial with the through hole is formed on the oil filling seat, and the high-pressure fuel pump oil filling device further includes an upper sealing ring coaxially fitted on the upper boss;

[0011] The guide seat has a countersunk hole for accommodating the upper boss, and the upper boss is detachably fitted into the countersunk hole and sealed to the guide seat through the upper sealing ring.

[0012] Optionally, a lower boss coaxial with the upper boss is formed on the oil filling seat, and the high-pressure fuel pump oil filling device further includes a lower sealing ring coaxially fitted on the lower boss;

[0013] The oil passage extends to the end of the lower boss away from the upper boss, and the lower boss is sealed to the target high-pressure fuel pump through the lower sealing ring and a cavity formed on the target high-pressure fuel pump and used to accommodate the lower boss.

[0014] Optionally, the high-pressure fuel pump oil filling device further includes a base plate, a vertical plate connected to the base plate, and a pressure plate detachably connected to the end of the vertical plate away from the base plate.

[0015] A predetermined height gap is formed between the pressure plate and the base plate so that the guide seat, the oil injection seat, and the target high-pressure fuel pump can be clamped together between the pressure plate and the base plate.

[0016] Optionally, the upright plate is connected to both ends of the pressure plate, and the high-pressure fuel pump oil filling device further includes a first bolt and a second bolt for connecting both ends of the pressure plate to the upright plate;

[0017] The first bolt and the second bolt are arranged in parallel, and the upright plate is used to rotate about the axial direction of the first bolt and form a first opening groove for accommodating the second bolt at a position corresponding to the second bolt.

[0018] Optionally, the guide seat forms a coaxial flange portion and a guide portion;

[0019] The pressure plate is used to abut against the flange and form a second opening groove for the guide to pass through, and the push rod passes through the guide.

[0020] Optionally, the high-pressure fuel pump oil filling device further includes a column vertically connected to the base plate, a top plate connected to the end of the column away from the base plate, and a hydraulic cylinder mounted on the top plate.

[0021] The pressure plate is disposed between the bottom plate and the top plate, and the push rod is used to abut against the telescopic end of the hydraulic cylinder.

[0022] Optionally, the pressure retainer includes a housing, a spring, and a sealing diaphragm made of elastic material. The sealing diaphragm is disposed within the housing and cooperates with the housing to form an oil storage chamber for sealing connection with the oil injection channel and a pressure chamber for communication with the external atmospheric environment. The spring is disposed within the pressure chamber, and its two ends abut against the sealing diaphragm and the housing, respectively.

[0023] The high-pressure fuel pump oil filling device also includes a support cup placed between the spring and the sealing diaphragm;

[0024] The support cup is coaxially arranged with the spring and is used to accommodate at least a portion of the spring;

[0025] The movable end of the indicator abuts against the support bowl and is linked with the support bowl.

[0026] Optionally, the indicator is a dial indicator.

[0027] Optionally, the indicator is a pressure sensor.

[0028] The beneficial effects of the high-pressure fuel pump oil filling device provided in this application are as follows: Compared with the prior art, in the high-pressure fuel pump oil filling device provided in this application, the oil injected through the oil filling hole can flow in the annular gap between the inner wall of the through hole and the push rod, and then be directionally introduced into the oil filling channel of the target high-pressure fuel pump along the oil groove at the end of the oil filling seat; during the oil filling process, the push rod and the inner wall of the guide hole of the guide seat maintain a sliding seal, which not only prevents the oil from leaking from the port away from the steel ball from the through hole, but also ensures that the push rod moves stably along the preset path through the precise guidance of the guide hole. In this way, when the oil filling is completed, by driving the push rod to push it towards the steel ball, the steel ball can be completely pushed out of the through hole and embedded into the oil filling channel of the high-pressure fuel pump. The size fit (interference fit) between the steel ball and the oil filling channel forms a sealing plug, directly closing the oil filling channel. In this way, the high-pressure fuel pump oil filling device provided in this application can realize oil filling and channel sealing simultaneously, completely eliminating the step-by-step operation process of filling oil first and then manually sealing in the traditional process, greatly improving the oil filling efficiency, which is far superior to the prior art. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of the high-pressure fuel pump oil filling device in the embodiments of this application;

[0031] Figure 2 This is a schematic diagram of the main structure of the high-pressure fuel pump oil filling device in the embodiments of this application;

[0032] Figure 3 For along Figure 2 Cross-sectional view of line AA in the middle;

[0033] Figure 4 This is a cross-sectional structural diagram of the pressure retainer in an embodiment of this application;

[0034] Figure 5 for Figure 3 Enlarged view of a section at point B in the middle;

[0035] Figure 6 This is a partial cross-sectional schematic diagram of the high-pressure fuel pump oil filling device in the embodiments of this application.

[0036] In the figure, the following reference numerals are used: 101, oil filling seat; 102, through hole; 103, oil filling hole; 104, steel ball; 105, oil groove; 106, push rod; 107, guide seat; 108, guide hole; 109, upper boss; 110, upper sealing ring; 111, countersunk hole; 112, lower boss; 113, lower sealing ring; 114, base plate; 115, vertical plate; 116, pressure plate; 117, first bolt; 118, second bolt. Two bolts; 119. First opening slot; 120. Flange; 121. Guide; 122. Second opening slot; 123. Column; 124. Top plate; 125. Hydraulic cylinder; 126. Pressure retainer; 127. Housing; 128. Spring; 129. Sealing membrane; 130. Oil reservoir; 131. Pressure chamber; 132. Support cup; 133. Indicator; 200. Target high-pressure fuel pump; 201. Fuel injection channel. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0041] Please refer to the following: Figures 1 to 6 The present application provides a description of a high-pressure fuel pump oil filling device according to an embodiment. This high-pressure fuel pump oil filling device includes an oil filling seat 101, a steel ball 104, a push rod 106, an indicator 133, and a guide seat 107. Wherein:

[0042] The fuel filler seat 101 forms a through hole 102 and a fuel filler hole 103 communicating with the through hole 102; the steel ball 104 can be pushed out and fitted into the through hole 102 and is adapted to the size of the fuel filler channel 201 on the target high-pressure fuel pump 200; the end of the fuel filler seat 101 near the steel ball 104 also forms a fuel groove 105 communicating with the through hole 102; the push rod 106 is movably inserted into the through hole 102 and is used to push the steel ball 104 into the fuel filler channel 201 to close the fuel filler channel 201; the push rod 106 is spaced apart from the inner wall of the through hole 102; the guide seat 107 is sealed and connected to the fuel filler seat 101 and forms a guide hole 108 through which the push rod 106 passes; the push rod 106 is slidably connected to the inner wall of the guide hole 108 and is slidably sealed to the inner wall of the guide hole 108; the indicator 133 is drivenly connected to the pressure retainer 126 on the target high-pressure fuel pump 200 and is used to detect the fuel injection quantity in real time.

[0043] According to the structure provided in this embodiment, in the high-pressure fuel pump oil filling device provided in this embodiment, the oil injected through the oil filling hole 103 can flow in the annular gap between the inner wall of the through hole 102 and the push rod 106, and then be directed into the oil filling channel 201 of the target high-pressure fuel pump 200 along the oil groove 105 at the end of the oil filling seat 101. During the oil filling process, the push rod 106 and the inner wall of the guide hole 108 of the guide seat 107 maintain a sliding seal, which not only prevents the oil from leaking from the port away from the steel ball 104 of the through hole 102, but also ensures that the push rod 106 moves stably along the preset path through the precise guidance of the guide hole 108. In this way, when the oil filling is completed, by driving the push rod 106 to push towards the steel ball 104, the steel ball 104 can be completely pushed out of the through hole 102 and embedded in the oil filling channel 201 of the high-pressure fuel pump. The size fit (interference fit) between the steel ball 104 and the oil filling channel 201 forms a sealing plug, directly closing the oil filling channel 201. Thus, the high-pressure fuel pump oil filling device provided in this embodiment can simultaneously realize oil filling and channel sealing, completely eliminating the step-by-step operation process of filling oil first and then manually sealing in the traditional process, greatly improving the oil filling efficiency, which is far superior to the existing technology.

[0044] Understandably, the interference fit between the steel ball 104 and the through hole 102 is a small interference fit. The specific interference fit can be determined based on the magnitude of the thrust generated by the amount of oil injected, to the extent that the steel ball 104 does not come out of the through hole 102 during the oil injection process and the push rod 106 can smoothly push the steel ball out after the oil injection is completed.

[0045] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6 The oil filling seat 101 has an upper boss 109 coaxial with the through hole 102. The high-pressure fuel pump oil filling device also includes an upper sealing ring 110 coaxially fitted on the upper boss 109. The guide seat 107 has a countersunk hole 111 for accommodating the upper boss 109. The upper boss 109 is detachably fitted into the countersunk hole 111 and sealed to the guide seat 107 through the upper sealing ring 110. According to the structure provided in this embodiment, the oil filling seat 101 can form a more sealed connection through the cooperation of the upper boss 109 and the countersunk hole 111, as well as the upper sealing ring 110 and the guide seat 107. This can further prevent oil leakage and improve the oil filling efficiency of the high-pressure fuel pump oil filling device in this embodiment.

[0046] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6The oil filler seat 101 has a lower boss 112 coaxial with the upper boss 109. The high-pressure fuel pump oil filling device also includes a lower sealing ring 113 coaxially fitted on the lower boss 112. The oil passage groove 105 extends to the end of the lower boss 112 away from the upper boss 109. The lower boss 112 is sealed to the target high-pressure fuel pump 200 through the lower sealing ring 113 and a cavity formed on the target high-pressure fuel pump 200 to accommodate the lower boss 112. According to the above structure provided in this embodiment, the oil filler seat 101 can better seal and cooperate with the target high-pressure fuel pump 200 through the lower boss 112 and the lower sealing ring 113, which is beneficial to further improve the oil filling efficiency of the high-pressure fuel pump oil filling device in this embodiment.

[0047] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6 The high-pressure fuel pump oil filling device also includes a base plate 114, a vertical plate 115 connected to the base plate 114, and a pressure plate 116 detachably connected to the end of the vertical plate 115 away from the base plate 114. A predetermined height gap is formed between the pressure plate 116 and the base plate 114 so that the guide seat 107, the oil filling seat 101, and the target high-pressure fuel pump 200 can be clamped together between the pressure plate 116 and the base plate 114. According to the structure provided in this embodiment, the guide seat 107, the oil filling seat 101, and the target high-pressure fuel pump 200 clamped between the pressure plate 116 and the base plate 114 can form good relative positional stability, which is beneficial to further improve the oil filling efficiency of the high-pressure fuel pump oil filling device in this embodiment.

[0048] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6 The upright plate 115 is connected to both ends of the pressure plate 116. The high-pressure fuel pump oil filling device also includes a first bolt 117 and a second bolt 118 for connecting the two ends of the pressure plate 116 to the upright plate 115. The first bolt 117 and the second bolt 118 are arranged in parallel. The upright plate 115 is used to rotate around the axial direction of the first bolt 117 and forms a first opening groove 119 for accommodating the second bolt 118 at a position corresponding to the second bolt 118. According to the structure provided in this embodiment, the pressure plate 116, which can rotate around the first bolt 117, can facilitate the installation of the oil filling seat 101 and the guide seat 107, and can also be quickly pressed between the upright plate 115 and the second bolt 118 through the first opening groove 119. This is beneficial to further improve the oil filling efficiency of the high-pressure fuel pump oil filling device in this embodiment.

[0049] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6The guide seat 107 forms a coaxial flange portion 120 and guide portion 121; the pressure plate 116 is used to abut against the flange portion 120 and forms a second opening groove 122 for the guide portion 121 to pass through, and the push rod 106 passes through the guide portion 121. According to the structure provided in this embodiment, the second opening groove 122 formed on the pressure plate 116 can facilitate the pressure plate 116 to be pressed on the flange portion 120, and can also facilitate the passage of the guide portion 121 and the push rod 106. In this way, the push rod 106 can be easily driven to move, which is beneficial to further improve the oil filling efficiency of the high-pressure fuel pump oil filling device in this embodiment.

[0050] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6 The high-pressure fuel pump oil filling device also includes a column 123 vertically connected to the base plate 114, a top plate 124 connected to the end of the column 123 away from the base plate 114, and a hydraulic cylinder 125 installed on the top plate 124. The pressure plate 116 is disposed between the base plate 114 and the top plate 124, and the push rod 106 is used to abut against the telescopic end of the hydraulic cylinder 125. According to the structure provided in this embodiment, on the one hand, after the oil filling is completed, the push rod 106 can be driven by the hydraulic cylinder 125 to push the steel ball 104 downward by abutting against the telescopic end of the hydraulic cylinder 125. The driving force is sufficient to push the steel ball 104 out of the through hole 102 and press it into the oil filling channel 201 at a set depth to form a firm interference fit (it can be understood that the interference between the diameter of the steel ball 104 and the inner diameter of the oil filling channel 201 can be set according to the specific high-pressure oil pump); on the other hand, at the initial stage of oil filling, the telescopic end of the hydraulic cylinder 125 first extends a set length to abut against the push rod 106. In this way, the push rod 106 can be prevented from moving upward under the pressure of the oil in the through hole 102 during the oil filling process, ensuring that the oil filling process is reliable and safe. This is also conducive to further improving the oil filling efficiency of the high-pressure fuel pump oil filling device in this embodiment.

[0051] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6The pressure retainer 126 on the target high-pressure fuel pump 200 includes a housing 127, a spring 128, and a sealing diaphragm 129 made of elastic material. The sealing diaphragm 129 is disposed inside the housing 127 and cooperates with the housing 127 to form an oil storage chamber 130 for sealing connection with the oil injection channel 201 and a pressure chamber 131 for communication with the external atmospheric environment. The spring 128 is disposed inside the pressure chamber 131 and its two ends abut against the sealing diaphragm 129 and the housing 127, respectively. According to the structure provided in this embodiment, since the oil reservoir 130 is used to communicate with the oil filling channel 201 of the target high-pressure fuel pump 200, when the oil in the target fuel pump 200 decreases, the sealing diaphragm 129 will move toward the oil reservoir 130 under the restoring force of the spring 128, thus reducing the volume of the oil reservoir 130. In this way, a portion of the oil stored in the oil reservoir 130 can enter the oil filling channel 201, thereby ensuring that the oil pressure inside the target high-pressure fuel pump 200 remains constant. This also helps to further improve the oil filling efficiency of the high-pressure fuel pump oil filling device in this embodiment.

[0052] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6 The high-pressure fuel pump oil filling device also includes a support bowl 132 disposed between the spring 128 and the sealing diaphragm 129; the support bowl 132 is coaxially arranged with the spring 128 and is used to accommodate at least a portion of the spring 128; the movable end of the indicator 133 abuts against the support bowl 132 and is linked with the support bowl 132. According to the above structure provided in this embodiment, the support bowl 132 disposed between the sealing diaphragm 129 and the spring 128 can effectively prevent the spring 128 from damaging the sealing diaphragm 129, which is also conducive to further improving the oil filling efficiency of the high-pressure fuel pump oil filling device in this embodiment.

[0053] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6The indicator 133 is a dial indicator, and more preferably, the indicator is a pressure sensor (not shown in the figure). Here, the mounting part of the dial indicator or pressure sensor is adjustablely mounted on one of the upright plates 115. It is understood that a separate mounting base can also be provided to install and fix the dial indicator or pressure sensor. At the same time, the movable end of the dial indicator or pressure sensor extends into the pressure chamber 131 through the vent on the housing 127 and abuts against the support bowl 132. In this way, the displacement / pressure signal generated by the deformation of the sealing diaphragm 129 under the pressure of the change in the amount of oil in the oil storage chamber 130 can be detected in real time. According to the structure provided in this embodiment, when a dial indicator is connected to the sealing diaphragm 129, the operator can quickly obtain the amount of oil added to the target high-pressure fuel pump 200. When the indicator 133 is a pressure sensor, when the pressure sensor is connected to the sealing diaphragm 129, the pressure sensor can transmit the oil pressure information of the target high-pressure fuel pump 200 back to the electronic control system, and can also be linked with the hydraulic cylinder 125 or the external oil filling equipment, thereby further improving the oil filling efficiency of the high-pressure fuel pump oil filling device in this embodiment. It is understood that the indicator 133 in this embodiment can also be a displacement sensor. In addition to having the same function as the dial indicator, it can also be connected to the displacement electrical signal control system to control the oil filling, pressing steel ball 104 and other actions to achieve the automation of oil filling.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-pressure fuel pump oil filling device, characterized in that, include: Oil injection seat (101) forms a through hole (102) and an oil injection hole (103) communicating with the through hole (102). The steel ball (104) can be pushed out and fitted into the through hole (102) and adapted to the size of the oil injection channel (201) on the target high-pressure fuel pump (200). The oil injection seat (101) near the steel ball (104) also forms an oil passage groove (105) that communicates with the through hole (102). A push rod (106) is movably inserted into the through hole (102) and used to push the steel ball (104) into the oil injection channel (201) to close the oil injection channel (201). The push rod (106) is spaced apart from the inner wall of the through hole (102). The guide seat (107) is sealed to the oil filling seat (101) and forms a guide hole (108) through which the push rod (106) passes. The push rod (106) is slidably connected to the inner wall of the guide hole (108) and slidably sealed to the inner wall of the guide hole (108). An indicator (133), drivenly connected to a pressure retainer (126) on the target high-pressure fuel pump (200), is used to detect the amount of fuel injected in real time.

2. The high-pressure fuel pump oil filling device as described in claim 1, characterized in that: An upper boss (109) coaxial with the through hole (102) is formed on the oil filling seat (101), and the high-pressure fuel pump oil filling device also includes an upper sealing ring (110) coaxially fitted on the upper boss (109). The guide seat (107) has a countersunk hole (111) for accommodating the upper boss (109), and the upper boss (109) is detachably fitted into the countersunk hole (111) and sealed to the guide seat (107) through the upper sealing ring (110).

3. The high-pressure fuel pump oil filling device as described in claim 2, characterized in that: The oil filling seat (101) has a lower boss (112) coaxial with the upper boss (109), and the high-pressure fuel pump oil filling device also includes a lower sealing ring (113) coaxially fitted on the lower boss (112). The oil passage (105) extends to the end of the lower boss (112) away from the upper boss (109), and the lower boss (112) is sealed to the target high-pressure fuel pump (200) through the lower sealing ring (113) and a cavity formed on the target high-pressure fuel pump (200) for accommodating the lower boss (112).

4. The high-pressure fuel pump oil filling device as described in claim 1, characterized in that: The high-pressure fuel pump oil filling device also includes a base plate (114), a vertical plate (115) vertically connected to the base plate (114), and a pressure plate (116) detachably connected to the end of the vertical plate (115) away from the base plate (114). A predetermined height interval is formed between the pressure plate (116) and the base plate (114) so ​​that the guide seat (107), the oil injection seat (101) and the target high-pressure fuel pump (200) can be clamped together between the pressure plate (116) and the base plate (114).

5. The high-pressure fuel pump oil filling device as described in claim 4, characterized in that: The upright plate (115) is connected to both ends of the pressure plate (116), and the high-pressure fuel pump oil filling device also includes a first bolt (117) and a second bolt (118) for connecting both ends of the pressure plate (116) to the upright plate (115). The first bolt (117) and the second bolt (118) are arranged in parallel, and the upright plate (115) is used to rotate about the axial direction of the first bolt (117) and form a first opening groove (119) for accommodating the second bolt (118) at a position corresponding to the second bolt (118).

6. The high-pressure fuel pump oil filling device as described in claim 5, characterized in that: The guide seat (107) forms a coaxial flange portion (120) and guide portion (121). The pressure plate (116) is used to abut against the flange (120) and form a second opening groove (122) for the guide (121) to pass through, and the push rod (106) passes through the guide (121).

7. The high-pressure fuel pump oil filling device as described in claim 6, characterized in that: The high-pressure fuel pump oil filling device also includes a column (123) vertically connected to the base plate (114), a top plate (124) connected to the end of the column (123) away from the base plate (114), and a hydraulic cylinder (125) mounted on the top plate (124). The pressure plate (116) is disposed between the bottom plate (114) and the top plate (124), and the push rod (106) is used to abut against the telescopic end of the hydraulic cylinder (125).

8. The high-pressure fuel pump oil filling device as described in claim 1, characterized in that: The pressure retainer (126) includes a housing (127), a spring (128), and a sealing diaphragm (129) made of elastic material. The sealing diaphragm (129) is disposed inside the housing (127) and cooperates with the housing (127) to form an oil storage chamber (130) for sealing connection with the oil injection channel (201) and a pressure chamber (131) for communication with the external atmospheric environment. The spring (128) is disposed inside the pressure chamber (131), and the two ends of the spring (128) abut against the sealing diaphragm (129) and the housing (127) respectively. The high-pressure fuel pump oil filling device also includes a support cup (132) placed between the spring (128) and the sealing diaphragm (129). The support cup (132) is coaxially arranged with the spring (128) and is used to accommodate at least a portion of the spring (128). The movable end of the indicator (133) abuts against the support bowl (132) and is linked with the support bowl (132).

9. The high-pressure fuel pump oil filling device as described in claim 1, characterized in that: The indicator (133) is a dial indicator.

10. The high-pressure fuel pump oil filling device as described in claim 1, characterized in that: The indicator (133) is a pressure sensor.

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