A universal automatic lubricating oil filling device for steel shell furnaces

Abstract

This utility model belongs to the technical field of steel shell furnaces and discloses a universal automatic lubricating oil filling device for steel shell furnaces. It includes a movable frame, on which an oil storage tank and a filling component are fixedly installed. The oil storage tank and the filling component are connected. A control cabinet is also fixedly installed on the movable frame near the edge. The overall structure of this utility model is simple, and it can automatically fill two filling ports of the steel shell furnace with lubricating oil at one time. It is convenient to maintain, low in cost, and improves the performance.

Description

Technical Field

[0001] This utility model belongs to the field of steel shell furnace technology, specifically, it relates to a universal automatic lubricating oil filling device for steel shell furnaces. Background Technology

[0002] In industrial production, steel-shell furnaces are important heating equipment. The lubrication and maintenance of their internal transmission and moving parts, such as bearings, chains, and hydraulic cylinders, directly affect the equipment's operational stability and service life. Due to the structural characteristics of steel-shell furnaces, multiple lubricating oil filling ports are usually required to meet the lubrication needs of different parts.

[0003] However, current methods for lubricating oil filling in steel-shell furnaces have significant limitations. Firstly, existing technologies mostly involve manually or using simple devices to individually fill each filling port with lubricating oil. This method is not only cumbersome and inefficient, making it difficult to meet the high-efficiency maintenance requirements of industrial production, but manual operation is also prone to oversights, leading to missed filling ports or uneven oil filling, which can cause accelerated component wear and equipment failure. Especially in large steel-shell furnaces, the large number of filling ports, some of which are scattered or located in difficult-to-access areas, further exacerbates the drawbacks of the individual filling method, increasing the workload and safety risks for maintenance personnel.

[0004] On the other hand, existing automatic or semi-automatic filling devices mostly rely on oil pumps as the power source for lubricating oil delivery. However, the operating environment of steel-shell furnaces is often complex, and the lubricating oil used may contain corrosive components or deteriorate due to high temperatures, oxidation, and other factors during long-term use, producing corrosive substances. Since the oil pump is in direct contact with the lubricating oil, it is susceptible to corrosion after prolonged operation, leading to pump body wear and seal failure. This not only affects the efficiency and stability of lubricating oil delivery but also increases the equipment failure rate and maintenance costs. Frequent replacement or repair of the oil pump can also disrupt the normal production schedule of the steel-shell furnace, causing economic losses.

[0005] Chinese patent application number CN2023211151067 discloses a lubricating oil filling device, belonging to the field of lubricating oil technology. It includes a filling tank, an electric telescopic rod fixedly connected to the inner bottom wall of the filling tank, a stabilizing plate fixedly connected to the output end of the electric telescopic rod, a push plate fixedly connected to the upper surface of the stabilizing plate, a sealing ring fixedly connected to the outer surface of the push plate, an oil guide pipe fixedly connected to the upper surface of the filling tank, an electromagnetic valve fixedly connected to the end of the oil guide pipe away from the filling tank, tempered glass fixedly embedded inside the filling tank, a sealing plug threaded to the upper surface of the filling tank, and a base fixedly connected to the bottom surface of the filling tank. Through the cooperation of the electric telescopic rod, stabilizing plate, push plate, oil guide pipe, electromagnetic valve, and sealing ring, the device can automatically fill lubricating oil. The combination of the tempered glass and the scale allows operators to easily check the remaining amount of lubricating oil inside the filling tank.

[0006] The problem is that the electric telescopic rod in this application is located inside the filling tank. When the sealing ring is damaged, lubricating oil flows from above the push plate to the bottom of the filling tank. It is impossible to detect whether the device can properly add lubricating oil, and the lubricating oil flowing to the bottom of the filling tank will damage the electric telescopic rod. Utility Model Content

[0007] The main technical problem to be solved by this utility model is to provide a universal automatic lubricating oil filling device for steel shell furnaces with a simple overall structure, capable of automatically filling two filling ports of steel shell furnace with lubricating oil at one time, convenient maintenance, low cost, and improved performance.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0009] A universal automatic lubricating oil filling device for steel shell furnace includes a movable frame, on which an oil storage tank and a filling component are fixedly installed. The oil storage tank and the filling component are connected. A control cabinet is also fixedly installed on the movable frame near the edge.

[0010] The refueling assembly includes a gearbox fixedly installed on a mobile frame, with a left refueling cylinder and a right refueling cylinder respectively connected to both sides of the gearbox;

[0011] The gearbox, left oil filler, and right oil filler are internally connected by a rack and pinion assembly.

[0012] The following are further optimizations of the above technical solution by this utility model:

[0013] The oil storage tank includes a bracket fixedly installed on a movable frame near one edge. A tank body is fixedly installed on the bracket. An oil filling port is provided at the upper end of the tank body. A sealing cap is hinged to the oil filling port. A breather valve is provided at the upper end of the tank body near the oil filling port. A pressure sensor is also fixedly installed on the inner wall of the tank body near the top.

[0014] Further optimization: A first oil outlet is provided on the side of the box near the bottom. The first oil outlet is connected to a first oil supply pipe. The other end of the first oil supply pipe is connected to the left oil filling cylinder. A first check valve is connected to the first oil supply pipe.

[0015] Further optimization: A second oil outlet is provided on the other side of the bottom of the housing. The second oil outlet is connected to a second oil supply pipe. The other end of the second oil supply pipe is connected to the right oil filling cylinder. A second check valve is connected to the second oil supply pipe.

[0016] Further optimization: A drive device for driving the rack assembly is also provided on the other side of the gearbox;

[0017] The drive unit includes a motor fixedly mounted on a mobile frame, and a reducer is driven through the motor's power output shaft.

[0018] Further optimization: The rack assembly includes a rotating shaft rotatably mounted inside the gearbox, with one end of the rotating shaft penetrating the inner wall of the gearbox and fixedly connected to the power output shaft of the reducer.

[0019] Further optimization: A gear is fixedly installed on the outer surface of the rotating shaft, and a rack is meshed on the outer surface of the gear. The two ends of the rack extend into the left and right oil cylinders, respectively.

[0020] Further optimization: A left piston is fixedly installed at the end of the rack that extends into the left fuel filler cylinder, and the outer surface of the left piston is in contact with the inner wall of the left fuel filler cylinder;

[0021] A right piston is fixedly installed at the end of the rack that extends into the right fuel filler cylinder, and the outer surface of the right piston is in contact with the inner wall of the right fuel filler cylinder.

[0022] Further optimization: The space between the left piston and the inner wall at the end of the left fuel filler is set as the left piston chamber, and the space between the right piston and the inner wall at the end of the right fuel filler is set as the right piston chamber;

[0023] The first oil supply pipe is connected to the left piston chamber, and the second oil supply pipe is connected to the right piston chamber.

[0024] Further optimization: A left proximity switch is provided on the left fuel tank, and a right proximity switch is provided on the right fuel tank;

[0025] The left piston chamber is also connected to the left oil delivery hose, and the left oil delivery hose is connected to the third check valve. The right piston chamber is also connected to the right oil delivery hose, and the right oil delivery hose is connected to the fourth check valve.

[0026] Both the left and right oil hoses have an oil inlet connector at the other end.

[0027] This utility model adopts the above-mentioned technical solution, which is ingenious in conception and reasonable in structure. It can improve the filling efficiency, reduce labor costs and safety risks. Through the design of the left oil filling cylinder, the right oil filling cylinder and the matching rack assembly, it can connect the two filling ports of the steel shell furnace at the same time and complete the lubricating oil filling simultaneously. Compared with the traditional "single filling one by one" method, the efficiency is increased by more than 100%, which can effectively meet the high efficiency requirements of equipment maintenance in industrial production and is convenient to use.

[0028] This design optimizes the power structure, enhances the equipment's corrosion resistance and stability, and abandons the traditional design that relies on an oil pump to deliver lubricating oil. Instead, it adopts a transmission structure of "motor + reducer + gear rack + piston," ensuring that the power components (motor, reducer, gearbox, etc.) do not directly contact the lubricating oil. Even if the lubricating oil produces corrosive substances due to the high temperature and oxidation of the steel-shell furnace, it will not damage the core power components, significantly reducing the probability of pump wear, seal failure, and other malfunctions, and extending the service life of the equipment.

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0030] Figure 1 This is a top view of the overall structure in an embodiment of this utility model;

[0031] Figure 2 This is a front view of the storage tank in an embodiment of the present utility model;

[0032] Figure 3 This is a schematic diagram of the internal structure of the refueling component in an embodiment of this utility model.

[0033] In the diagram: 1. Movable frame; 2. Oil tank; 21. Support; 22. Housing; 23. First oil outlet; 24. Second oil outlet; 25. Breather valve; 26. Pressure sensor; 27. Filling port; 28. Sealing cap; 29. ​​First oil supply pipe; 291. First check valve; 30. Second oil supply pipe; 301. Second check valve; 3. Filling assembly; 31. Drive unit; 311. Motor; 312. Reducer; 32. Gear 320. Gear; 321. Rack; 33. Rotating shaft; 34. Left oil filler; 340. Left piston; 341. Left piston chamber; 342. Left oil hose; 343. Third check valve; 345. Left proximity switch; 35. Right oil filler; 351. Right piston; 352. Right piston chamber; 353. Right oil hose; 354. Fourth check valve; 355. Right proximity switch; 4. Oil inlet connector; 5. Control cabinet. Detailed Implementation

[0034] like Figure 1-3As shown: A universal lubricating oil automatic filling device for steel shell furnace includes a movable frame 1, on which an oil storage tank 2 and a filling component 3 are fixedly installed. The oil storage tank 2 and the filling component 3 are connected. A control cabinet 5 is also fixedly installed on the movable frame 1 near the edge.

[0035] The refueling assembly 3 includes a gearbox 32 fixedly installed on the mobile frame 1, with a left refueling cylinder 34 and a right refueling cylinder 35 respectively connected to both sides of the gearbox 32.

[0036] The gearbox 32, the left oil filler 34, and the right oil filler 35 are internally connected by a rack and pinion assembly.

[0037] In this embodiment, the mobile frame 1 is designed to be movable, which is achieved by setting universal wheels at the four corners of the mobile frame 1, making the device easy to move.

[0038] The oil storage tank 2 includes a bracket 21 that is fixedly installed on the mobile frame 1 near one edge.

[0039] A housing 22 is fixedly installed on the bracket 21, and the housing 22 stores the lubricating oil to be added.

[0040] The upper end of the housing 22 is provided with a filling port 27. When in use, the lubricating oil to be added is poured into the housing 22 through the filling port 27 for storage.

[0041] A sealing cap 28 is hinged to the oil filling port 27. The sealing cap 28 and the oil filling port 27 are directly sealed inside the box 22 by setting a sealing strip. The specific sealing method is known in the prior art and will not be described in detail here.

[0042] This design prevents external impurities from entering the housing 22 and contaminating the lubricating oil.

[0043] A breather valve 25 is provided at the upper end of the housing 22 near the oil filling port 27, and the breather valve 25 is connected to the inside of the housing 22.

[0044] The breather valve 25 is an automatically opening and closing valve. When the pressure inside the container is lower than atmospheric pressure due to the reduction of oil, the valve automatically opens to draw in outside air (filtered by a screen). When the internal pressure of the system is slightly higher than atmospheric pressure due to temperature changes (such as oil expansion caused by rising oil temperature), the valve opens to discharge a small amount of gas to maintain pressure balance.

[0045] The breathing valve 25 is commercially available.

[0046] A pressure sensor 26 is also fixedly installed on the inner wall of the housing 22 near the top. The pressure sensor 26 can monitor the pressure inside the housing 22 in real time. When the breather valve 25 is blocked, the pressure inside the housing 22 will drop suddenly during use, affecting the lubricating oil filling. At this time, the pressure sensor 26 will detect the sudden pressure change and provide feedback to repair or replace the breather valve 25.

[0047] The housing 22 has a first oil outlet 23 near the bottom, and the first oil outlet 23 is connected to a first oil supply pipe 29. The other end of the first oil supply pipe 29 is connected to the left oil filling cylinder 34.

[0048] The outer surface of the housing 22 is also provided with an oil level observation strip arranged along the height direction of the housing 22, which facilitates the observation of the oil level changes of the lubricating oil inside the housing 22.

[0049] In this embodiment, the oil level observation strip is made of transparent acrylic sheet.

[0050] The first oil supply pipe 29 is connected to a first check valve 291 to ensure that lubricating oil is output unidirectionally from the oil storage tank 2 to the left oil filling cylinder 34.

[0051] The housing 22 is provided with a second oil outlet 24 on the other side near the bottom. The second oil outlet 24 is connected to a second oil supply pipe 30, and the other end of the second oil supply pipe 30 is connected to the right oil filling cylinder 35.

[0052] The second oil supply pipe 30 is connected to a second check valve 301 to ensure that lubricating oil is output unidirectionally from the oil storage tank 2 to the right oil filling cylinder 35.

[0053] On the other side of the gearbox 32, there is also a drive device 31 for driving the rack assembly, and the drive device 31 is also fixedly installed on the movable frame 1.

[0054] The drive device 31 includes a motor 311 fixedly mounted on the movable frame 1, and the power output shaft of the motor 311 is connected to a reducer 312 via a coupling.

[0055] The connection method between the motor 311 and the reducer 312 is well known in the prior art and will not be described in detail here. Both the motor 311 and the reducer 312 are commercially available.

[0056] In this embodiment, the motor 311 is configured to rotate in both forward and reverse directions and is controlled by the control cabinet 5.

[0057] The rack assembly includes a rotating shaft 33 rotatably mounted within a gearbox 32, the rotating shaft 33 being rotatably mounted within the gearbox 32 via bearings.

[0058] One end of the rotating shaft 33 passes through the inner wall of the gearbox 32 and is fixedly connected to the power output shaft of the reducer 312. With this design, starting the motor 311 drives the rotating shaft 33 to rotate.

[0059] A gear 320 is fixedly mounted on the outer surface of the rotating shaft 33, and a rack 321 is meshed with the outer surface of the gear 320.

[0060] The rack 321 extends into the left oil filling cylinder 34 and the right oil filling cylinder 35 at both ends, respectively.

[0061] A left piston 340 is fixedly installed at the end of the rack 321 that extends into the left oil filling cylinder 34. The outer surface of the left piston 340 is in contact with the inner wall of the left oil filling cylinder 34 by a sealing ring.

[0062] A right piston 351 is fixedly installed at the end of the rack 321 that extends into the right oil filling cylinder 35. The outer surface of the right piston 351 is also connected to the inner wall of the right oil filling cylinder 35 by a sealing ring.

[0063] The left piston 340 and the inner wall at the end of the left oil filling cylinder 34 are configured as a left piston cavity 341, and the left piston 340 slides in the left piston cavity 341.

[0064] The right piston 351 and the inner wall at the end of the right oil filling cylinder 35 are configured as a right piston cavity 352, and the right piston 351 slides in the right piston cavity 352.

[0065] The first oil supply pipe 29 is connected to the left piston chamber 341, and the second oil supply pipe 30 is connected to the right piston chamber 352.

[0066] The left oil cylinder 34 is equipped with a left proximity switch 345, which can control the left and right movement of the left piston 340.

[0067] The right oil tank 35 is equipped with a right proximity switch 355, which can control the left and right movement of the right piston 351.

[0068] The left piston chamber 341 is also connected to the left oil delivery hose 342, and the left oil delivery hose 342 is connected to the third check valve 343 to ensure that the lubricating oil flows unidirectionally from the left piston chamber 341 to the left oil delivery hose 342.

[0069] The right piston chamber 352 is also connected to the right oil supply hose 353, and the right oil supply hose 353 is connected to the fourth check valve 354 to ensure that the lubricating oil flows unidirectionally from the right piston chamber 352 to the right oil supply hose 353.

[0070] The other ends of the left oil hose 342 and the right oil hose 353 are both connected to an oil inlet connector 4.

[0071] In this embodiment, the oil injection port connector 4 can be matched with the oil injection hole of the steel shell furnace, and lubricating oil is added to the oil injection hole through the oil injection port connector 4.

[0072] The oil inlet connector 4 is commercially available.

[0073] This design allows the device to add lubricating oil to both oil inlets of the steel-shell furnace at the same time, reducing the workload of the workers.

[0074] The area between the left piston 340 and the right piston 351 is designed to be open to the outside. This design can balance the pressure difference on both sides in real time when the left piston 340 and the right piston 351 move back and forth with the rack 321, so as to avoid the formation of negative pressure or overpressure in the inner area due to movement, ensure smooth movement without jamming, and ensure the stability of the transmission process of the refueling component 3 and the efficiency of lubricating oil filling.

[0075] The control cabinet 5 contains a control system that drives the device.

[0076] The control terminal of the motor 311 is electrically connected to the control system, and the signal output terminal of the pressure sensor 26 is electrically connected to the control system.

[0077] The signal output terminals of both the left proximity switch 345 and the right proximity switch 355 are electrically connected to the control system.

[0078] The control principle of the aforementioned control system is well known in the prior art and will not be elaborated here.

[0079] Before starting the device and adding lubricating oil, the left piston chamber 341 and the right piston chamber 352 need to be pre-filled with lubricating oil. Switch to manual control mode through control cabinet 5, block the signals of left proximity switch 345 and right proximity switch 355 (to avoid triggering the stop during the movement of left piston 340 and right piston 351), and then manually control the start motor 311.

[0080] The control motor 311 rotates clockwise. The power of the motor 311 is reduced by the reducer 312 and then transmitted to the rotating shaft 33, which drives the gear 320 in the gearbox 32 to rotate clockwise. The gear 320 meshes with the rack 321, driving the rack 321 to move to the right. The right end of the rack 321 drives the left piston 340 to move to the right synchronously in the left oil cylinder 34, which increases the volume and reduces the pressure inside the left piston chamber 341. Under the action of the pressure difference, the lubricating oil in the oil tank 2 is transported to the left piston chamber 341 through the first oil outlet 23, the first oil supply pipe 29 and the first check valve 291 in a one-way flow, thus completing the lubricating oil filling of the left piston chamber 341.

[0081] After the left piston chamber 341 is filled, the motor 311 is manually reversed. The power of the motor 311 drives the gear 320 to rotate counterclockwise through the reducer 312 and the rotating shaft 33, which in turn drives the rack 321 to move to the left. The left end of the rack 321 drives the right piston 351 to move to the left in the right oil cylinder 35, which increases the volume and reduces the pressure inside the right piston chamber 352. Similarly, the lubricating oil in the oil tank 2 is transported to the right piston chamber 352 through the second oil outlet 24, the second oil supply pipe 30 and the second check valve 301, completing the lubricating oil filling of the right piston chamber 352.

[0082] Repeat the above "motor 311 clockwise-reverse" operation, observe the oil level change in oil tank 2 or judge by experience, until the left piston chamber 341 and right piston chamber 352 are filled with lubricating oil that can meet the needs of a single filling, then end the manual pre-filling operation, switch back to automatic control mode, and then enter the steel shell furnace filling process.

[0083] Then, the two oil inlet connectors 4 are connected to the oil inlet on the steel shell furnace to be filled with lubricating oil. The connection method is well known in the prior art and will not be described in detail here.

[0084] When the automatic control of the device is activated, motor 311 starts. When rack 321 moves to the right, it compresses right piston chamber 352. At this time, lubricating oil in right piston chamber 352 is added to the corresponding filling port through right oil hose 353. Left piston chamber 341 increases in volume and continues to draw lubricating oil from oil tank 2. When right piston 351 moves to the right and triggers right proximity switch 355, lubricating oil is added to one filling port. The signal is fed back to the control system, which then controls motor 311 to reverse. The principle is the same. When left piston 340 moves to the left and triggers left proximity switch 345, lubricating oil is added to the other filling port. This process can be repeated multiple times depending on the filling situation of the filling port.

[0085] If the breather valve 25 becomes blocked during use, the output of lubricating oil in the housing 22 will cause a negative pressure to form inside the housing and cannot be balanced by the breather valve 25. This will cause a sudden drop in internal pressure during use, affecting the normal filling of lubricating oil. At this time, the pressure sensor 26 will detect the sudden change in pressure and report it to the control system.

[0086] When the total number of filling ports of the steel shell furnace is odd, one of the oil filling port connectors 4 can be inserted into the oil filling port 27 of the oil storage tank 2 (the connector must be clean) to avoid leakage of residual lubricating oil or impurities entering the connector, thereby improving the flexibility of the device application.

[0087] For those skilled in the art, any changes, modifications, substitutions, and variations made to the embodiments based on the teachings of this utility model, without departing from the principles and spirit of this utility model, still fall within the protection scope of this utility model.

Claims

1. A universal automatic lubricating oil filling device for steel shell furnaces, comprising a movable frame (1), characterized in that: An oil storage tank (2) and a refueling component (3) are fixedly installed on the mobile frame (1). The oil storage tank (2) and the refueling component (3) are connected. A control cabinet (5) is also fixedly installed on the mobile frame (1) near the edge. The refueling assembly (3) includes a gearbox (32) fixedly installed on the mobile frame (1), with a left refueling cylinder (34) and a right refueling cylinder (35) respectively connected to both sides of the gearbox (32). The gearbox (32), the left oil filler (34) and the right oil filler (35) are internally connected by a rack and pinion assembly.

2. The automatic lubricating oil filling device for a steel shell furnace according to claim 1, characterized in that: The oil storage tank (2) includes a bracket (21) fixedly installed on the mobile frame (1) near one side edge. A box body (22) is fixedly installed on the bracket (21). An oil filling port (27) is provided at the upper end of the box body (22). A sealing cap (28) is hinged to the oil filling port (27). A breather valve (25) is provided at the upper end of the box body (22) near the oil filling port (27). A pressure sensor (26) is also fixedly installed on the inner wall of the box body (22) near the upper part.

3. The automatic lubricating oil filling device for a steel shell furnace according to claim 2, characterized in that: The housing (22) has a first oil outlet (23) near the bottom. The first oil outlet (23) is connected to a first oil supply pipe (29). The other end of the first oil supply pipe (29) is connected to the left oil filling cylinder (34). A first check valve (291) is connected to the first oil supply pipe (29).

4. The universal automatic lubricating oil filling device for steel shell furnaces according to claim 3, characterized in that: The housing (22) has a second oil outlet (24) on the other side near the bottom. The second oil outlet (24) is connected to a second oil supply pipe (30). The other end of the second oil supply pipe (30) is connected to the right oil filling cylinder (35). A second check valve (301) is connected to the second oil supply pipe (30).

5. The universal automatic lubricating oil filling device for steel shell furnaces according to claim 4, characterized in that: On the other side of the gearbox (32), there is also a drive device (31) for driving the rack assembly. The drive unit (31) includes a motor (311) fixedly mounted on the movable frame (1), and the power output shaft of the motor (311) is connected to a reducer (312).

6. The automatic lubricating oil filling device for a steel shell furnace according to claim 5, characterized in that: The rack assembly includes a rotating shaft (33) rotatably mounted inside the gearbox (32), with one end of the rotating shaft (33) penetrating the inner wall of the gearbox (32) and fixedly connected to the power output shaft of the reducer (312).

7. The universal automatic lubricating oil filling device for steel shell furnaces according to claim 6, characterized in that: A gear (320) is fixedly installed on the outer surface of the rotating shaft (33), and a rack (321) is meshed on the outer surface of the gear (320). The two ends of the rack (321) extend into the left oil cylinder (34) and the right oil cylinder (35) respectively.

8. The automatic lubricating oil filling device for a steel shell furnace according to claim 7, characterized in that: A left piston (340) is fixedly installed at the end of the rack (321) extending into the left oil filling cylinder (34), and the outer surface of the left piston (340) is in contact with the inner wall of the left oil filling cylinder (34); A right piston (351) is fixedly installed at the end of the rack (321) extending into the right oil filling cylinder (35), and the outer surface of the right piston (351) is in contact with the inner wall of the right oil filling cylinder (35).

9. The automatic lubricating oil filling device for a steel shell furnace according to claim 8, characterized in that: The left piston (340) and the inner wall at the end of the left oil cylinder (34) are configured as the left piston chamber (341), and the right piston (351) and the inner wall at the end of the right oil cylinder (35) are configured as the right piston chamber (352). The first oil supply pipe (29) is connected to the left piston chamber (341), and the second oil supply pipe (30) is connected to the right piston chamber (352).

10. The automatic lubricating oil filling device for a steel shell furnace according to claim 9, characterized in that: A left proximity switch (345) is provided on the left oil tank (34), and a right proximity switch (355) is provided on the right oil tank (35). The left piston chamber (341) is also connected to the left oil delivery hose (342), and the left oil delivery hose (342) is connected to the third check valve (343). The right piston chamber (352) is also connected to the right oil delivery hose (353), and the right oil delivery hose (353) is connected to the fourth check valve (354). The other ends of the left oil hose (342) and the right oil hose (353) are both connected to an oil inlet connector (4).

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