A new type of energy-saving propulsion motor for electric tugboats

Abstract

This invention relates to the field of electric motor technology and provides a novel energy-saving propulsion motor for electric tugboats. The motor includes a motor body with support plates on both sides of its bottom. It further includes: telescopic columns fixedly installed on both sides of the bottom of the two support plates; first return springs fixedly installed on both sides of the bottom of the two support plates; and bases fixedly installed at the other ends of the four first return springs and the four telescopic columns. Two first sliding grooves are formed on the bottom of the support plates, and first sliders are slidably connected to both sides of the inner surface of the two first sliding grooves. The four first sliders are arranged in pairs. In this embodiment, the first return springs and the cross-support structure effectively buffer the motor body when it vibrates, reducing the impact force transmitted to the motor body, thereby protecting the motor body from excessive mechanical impact and extending its service life.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and in particular to a novel energy-saving propulsion electric motor for electric tugboats. Background Technology

[0002] The new type of energy-saving propulsion motor for electric tugboats is a highly efficient and environmentally friendly power system, mainly used in ports, ships, and other fields to tow and guide vessels. Compared with traditional diesel tugboats, the energy-saving propulsion motor of electric tugboats can significantly improve energy efficiency, reduce energy consumption, and lower emissions.

[0003] In existing new electric tugboats, the energy-saving propulsion motor is usually fixedly installed on the tugboat body via its base. While this installation method can ensure the basic stability of the motor, it often lacks an effective buffer structure. During actual operation, the propulsion motor of the electric tugboat will face significant mechanical vibration and impact forces. These vibration sources may come from the operation of the motor itself, the operation of the tugboat, or the influence of the external environment. Due to the lack of a buffer structure, these vibrations and impact forces act directly on the motor body, which may have an adverse effect on the key components of the motor (such as bearings, rotor, and stator). Long-term vibration and impact may lead to fatigue damage and accelerated wear of the internal components of the motor, thereby shortening the service life of the motor and reducing its operating efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that the lack of a buffer structure in the prior art leads to vibration and impact forces acting directly on the motor body, which may have an adverse effect on the key components of the motor (such as bearings, rotor and stator).

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a novel energy-saving propulsion motor for electric tugboats, comprising a motor body, wherein support plates are provided on both sides of the bottom of the motor body, and further comprising;

[0006] Telescopic columns are fixedly installed on both sides of the bottom of the two support plates, and first return springs are fixedly installed on both sides of the bottom of the two support plates. Bases are fixedly installed on the other end of the four first return springs and the four telescopic columns.

[0007] Two first sliding grooves are both formed at the bottom of the support plate. Two first sliders are slidably connected to both sides of the inner surface of the two first sliding grooves. The four first sliders are divided into two groups of two.

[0008] Two intersecting uprights are hinged inside the first slider, and two second sliders are hinged to the bottom sides of the two intersecting uprights. The four second sliders are divided into two groups of two.

[0009] Two sliding rods are slidably connected inside the two sets of second sliders. Both sliding rods are fixedly installed on the top of the base. A second return spring is fixedly installed on the outer side of each of the four second sliders. The other end of each of the four second return springs is fixedly installed on the top of the base.

[0010] In the above technical solution, preferably, a first pushing block is fixedly installed on the bottom of each of the two support plates, a second pushing block is slidably connected to the bottom of each of the two first pushing blocks, a second sliding groove is opened on both sides of the top of the base, and the bottom of each of the two second pushing blocks is slidably connected to the inner surface of the second sliding groove.

[0011] In the above technical solution, preferably, an oil tank is provided on the top right side of the base, an oil injection pipe is fixedly installed on the top right side of the oil tank, an oil outlet pipe is fixedly installed on the left side of the oil tank, and a press-type water pump is provided on the left outer surface of the oil outlet pipe.

[0012] In the above technical solution, preferably, a push plate is provided on the left side of the press pump, the push plate is located on the right side of the two second push blocks, and two third return springs are fixedly installed on the right side of the push plate.

[0013] In the above technical solution, preferably, the other ends of the two third reset springs are fixedly installed on the top right side of the base, the top of the press pump is provided with a first hose, the other end of the first hose is fixedly fitted with a sleeve, and the right side of the sleeve is located on the left side of the motor body.

[0014] In the above technical solution, preferably, a bearing is provided inside the sleeve, the inner ring of the bearing is provided on the outer surface of the output shaft of the motor body, and a sponge is provided at the other end of the first hose.

[0015] In the above technical solution, preferably, the sponge is disposed inside the sleeve, the bottom of the sponge is movably connected to the outer surface of the output shaft of the motor body, a second flexible tube is disposed on the bottom side inside the sleeve, and a filter element is disposed at the other end of the second flexible tube.

[0016] In the above technical solution, preferably, the bottom of the filter element is fixedly installed on the top left side of the base, a filter plate is movably embedded inside the filter element, positioning grooves are opened on both sides of the inner wall of the filter element, and positioning posts are fixedly installed on both sides of the filter plate.

[0017] In the above technical solution, preferably, both positioning posts are matched with the positioning groove, a fixing member is movably sleeved on the left outer surface of the filter plate, bolts are threaded around the inside of the fixing member, and four threaded holes are opened on the left side of the filter plate.

[0018] In the above technical solution, preferably, all four bolts are matched with the threaded holes, a pump is provided on the rear side of the filter element, an oil inlet pipe is fixedly installed on the rear side of the pump, and the other end of the oil inlet pipe is fixedly installed on the rear side of the oil tank.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0020] 1. In this embodiment of the invention, when the motor body vibrates, the telescopic column on the base and the first return spring can be pressed down by the support plate to retract them. When the support plate descends, the cross rod can be pressed down by the first slider simultaneously, so that the cross rod can be flipped by its internal rotating shaft. When the cross rod flips, the first slider is pulled to slide outward on the inner surface of the first slide groove by the hinge. At the same time, the second slider is pulled to slide outward on the outer surface of the slide rod by the hinge. When the second slider slides, it can squeeze the second return spring to retract it, thereby buffering the motor body. Through the arrangement of the first return spring and the cross rod structure, effective buffering can be achieved when the motor body vibrates, reducing the impact force transmitted to the motor body, thereby protecting the motor body from excessive mechanical impact and extending its service life. This solves the problem in the prior art that there is no buffer structure, which causes vibration and impact force to act directly on the motor body, which may have an adverse effect on the key components of the motor (such as bearings, rotor and stator).

[0021] 2. In this embodiment of the invention, personnel can first inject lubricating oil into the oil tank through the oil injection pipe. When the support plate descends, it will press down the first pushing block, allowing it to slide on top of the second pushing block. Simultaneously, the first pushing block can push the second pushing block to the right, allowing it to slide to the right through the second sliding groove. When the second pushing block slides, the push plate can squeeze the third return spring, causing it to contract. At the same time, the push plate can squeeze the pressing end of the water pump, thereby allowing the pressing end of the water pump to draw out the lubricating oil inside the oil tank through the oil outlet pipe when squeezed. The first hose injects lubricating oil into the sponge inside the sleeve. When the output shaft of the motor body rotates, it rotates inside the sleeve through the bearing, and lubricating oil seeps out through the sponge to lubricate the output shaft. The arrangement of the first push block and the sponge structure allows the lubricating oil to be precisely drawn from the oil tank and injected into the sponge inside the sleeve. The sponge can slowly release the lubricating oil, ensuring that the output shaft receives uniform and continuous lubrication during rotation. This reduces wear on the output shaft of the motor body during rotation and further extends its service life.

[0022] 3. In this embodiment of the invention, when the output shaft is lubricated by a sponge, excess lubricating oil on the surface of the output shaft drips onto the inner bottom side of the sleeve. The lubricating oil can then be transported to the interior of the filter element through the second hose, where it is filtered by the filter plate. At this point, personnel can start the pump via its power supply system, allowing it to extract the filtered lubricating oil from the filter element and re-inject it into the oil tank through the inlet pipe. Personnel can also reverse the bolt to disengage it from the threaded hole and pull the fixing member to disengage its right side from the left side of the filter element and simultaneously disengage it from the filter plate. Then, personnel can pull the filter plate to the left, causing the positioning column to slide to the left within the positioning groove, thereby detaching the filter plate from the filter element for replacement. The design of the filter element and fixing member structure not only allows the filtered lubricating oil to be re-injected into the oil tank for recycling, reducing lubricating oil waste, but also facilitates easy disassembly and replacement of the filter plate, simplifying maintenance and significantly reducing labor intensity. Attached Figure Description

[0023] Figure 1 A rear-view three-dimensional structural diagram of a novel energy-saving propulsion motor for an electric tugboat provided by the present invention;

[0024] Figure 2 A cross-sectional three-dimensional structural schematic diagram of the sleeve in a novel energy-saving propulsion motor for an electric tugboat provided by the present invention;

[0025] Figure 3 A partial three-dimensional structural diagram of a novel energy-saving propulsion motor for an electric tugboat provided by the present invention. Figure 1 ;

[0026] Figure 4 A cross-sectional three-dimensional structural schematic diagram of the support plate in a novel energy-saving propulsion motor for an electric tugboat provided by the present invention;

[0027] Figure 5 A partial three-dimensional structural diagram of a novel energy-saving propulsion motor for an electric tugboat provided by the present invention. Figure 2 ;

[0028] Figure 6 A cross-sectional perspective three-dimensional structural diagram of the second push block in a novel energy-saving propulsion motor for an electric tugboat provided by the present invention;

[0029] Figure 7 A cross-sectional perspective view of the base of a novel energy-saving propulsion motor for an electric tugboat provided by the present invention;

[0030] Figure 8A cross-sectional perspective three-dimensional structural diagram of a filter element in a novel energy-saving propulsion motor for an electric tugboat provided by the present invention;

[0031] Figure 9 A partial three-dimensional structural diagram of a novel energy-saving propulsion motor for an electric tugboat provided by the present invention. Figure 3 .

[0032] Legend:

[0033] 1. Motor body; 101. Support plate; 102. Telescopic column; 103. First return spring; 104. Base; 105. First slide groove; 106. First slider; 107. Cross uprights; 108. Second slider; 109. Slide rod; 110. Second return spring; 2. First push block; 201. Second push block; 202. Second slide groove; 203. Oil tank; 204. Oil injection pipe; 205. Oil outlet pipe; 206. Press-to-pump pump; 207. Push plate; 208. Third return spring; 209. First hose; 210. Sleeve; 211. Sponge; 212. Bearing; 3. Second hose; 301. Filter element; 302. Filter plate; 303. Positioning groove; 304. Positioning column; 305. Fixing element; 306. Bolt; 307. Threaded hole; 308. Pump; 309. Oil inlet pipe. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figure 1-9This embodiment provides a technical solution: a novel energy-saving propulsion motor for electric tugboats, including a motor body 1, with support plates 101 on both sides of the bottom of the motor body 1, and further including: telescopic columns 102 fixedly installed on both sides of the bottom of the two support plates 101, first return springs 103 fixedly installed on both sides of the bottom of the two support plates 101, and bases 104 fixedly installed on the other ends of the four first return springs 103 and the four telescopic columns 102; two first sliding grooves 105, each formed at the bottom of the support plate 101, with sliding connections on both sides of the inner surface of the two first sliding grooves 105. The first slider 106 is divided into two groups of four, with each group consisting of two crossbars 107. Two crossbars 107 are hinged inside the first sliders 106. Second sliders 108 are hinged to both sides of the bottom of each crossbar 107, with each group consisting of four second sliders 108, also in pairs. Two sliding rods 109 are slidably connected inside the two groups of second sliders 108. Both sliding rods 109 are fixedly installed on the top of the base 104. Second return springs 110 are fixedly installed on the outer sides of each of the four second sliders 108, with the other ends of each of the four second return springs 110 fixedly installed on the top of the base 104.

[0036] In use, when the motor body 1 vibrates, the support plate 101 can press down on the telescopic column 102 and the first return spring 103 on the base 104 to retract them. When the support plate 101 descends, the first slider 106 can simultaneously press down on the cross rod 107, allowing the cross rod 107 to flip via its internal rotating shaft. When the cross rod 107 flips, the hinge pulls the first slider 106 to slide outward on the inner surface of the first slide groove 105. At the same time, the hinge pulls the second slider 108 to slide outward on the outer surface of the slide rod 109. When the second slider 108 slides, it can compress the second return spring 110 to retract it, thus buffering the motor body 1. The structure of the first return spring 103 and the cross rod 107 can effectively buffer the vibration of the motor body 1, reducing the impact force transmitted to the motor body 1, thereby protecting the motor body 1 from excessive mechanical impact and extending its service life.

[0037] Please see Figures 1 to 9In one embodiment, a first pushing block 2 is fixedly installed on the bottom of each of the two support plates 101, and a second pushing block 201 is slidably connected to the bottom of each of the two first pushing blocks 2. A second sliding groove 202 is provided on both sides of the top of the base 104. The bottom of each of the two second pushing blocks 201 is slidably connected to the inner surface of the second sliding groove 202. This allows the first pushing block 2 to be pressed down when the support plate 101 is lowered, so that it can slide on the top of the second pushing block 201. At the same time, the second pushing block 201 can be pushed to the right by the first pushing block 2, so that it can slide to the right through the second sliding groove 202.

[0038] Please see Figures 1 to 9 In one embodiment, an oil tank 203 is provided on the top right side of the base 104, an oil injection pipe 204 is fixedly installed on the top right side of the oil tank 203, an oil outlet pipe 205 is fixedly installed on the left side of the oil tank 203, and a press pump 206 is provided on the outer left side of the oil outlet pipe 205. Lubricating oil can be injected into the oil tank 203 through the oil injection pipe 204, and when the pressing end of the press pump 206 is squeezed, the lubricating oil inside the oil tank 203 can be extracted through the oil outlet pipe 205.

[0039] Please see Figures 1 to 9 In one embodiment, a push plate 207 is provided on the left side of the press pump 206. The push plate 207 is located on the right side of the two second push blocks 201. Two third return springs 208 are fixedly installed on the right side of the push plate 207. When the second push blocks 201 slide, the push plate 207 can squeeze the third return springs 208 to make them contract, and at the same time, the push plate 207 can squeeze the pressing end of the press pump 206.

[0040] Please see Figures 1 to 9 In one embodiment, the other ends of the two third return springs 208 are fixedly installed on the top right side of the base 104. A first hose 209 is provided on the top of the press pump 206. A sleeve 210 is fixedly sleeved on the outer surface of the other end of the first hose 209. The right side of the sleeve 210 is located on the left side of the motor body 1. Lubricating oil can be injected into the inside of the sponge 211 in the sleeve 210 through the first hose 209 so as to lubricate the output shaft of the motor body 1 through the sponge 211.

[0041] Please see Figures 1 to 9 In one embodiment, a bearing 212 is provided inside the sleeve 210, and the inner ring of the bearing 212 is provided on the outer surface of the output shaft of the motor body 1. A sponge 211 is provided at the other end of the first hose 209, so that the output shaft can rotate inside the sleeve 210 through the bearing 212.

[0042] Please see Figures 1 to 9In one embodiment, a sponge 211 is disposed inside a sleeve 210, and the bottom of the sponge 211 is movably connected to the outer surface of the output shaft of the motor body 1. A second hose 3 is disposed on the bottom side inside the sleeve 210, and a filter element 301 is disposed at the other end of the second hose 3. This allows excess lubricating oil on the surface of the output shaft to drip onto the bottom side inside the sleeve 210, and the lubricating oil can be transported to the inside of the filter element 301 through the second hose 3.

[0043] Please see Figures 1 to 9 In one embodiment, the bottom of the filter element 301 is fixedly installed on the top left side of the base 104. The filter plate 302 is movably embedded inside the filter element 301. Positioning grooves 303 are provided on both sides of the inner wall of the filter element 301. Positioning posts 304 are fixedly installed on both sides of the filter plate 302. The lubricating oil can be filtered through the filter plate 302 inside the filter element 301.

[0044] Please see Figures 1 to 9 In one embodiment, both positioning posts 304 are matched with positioning grooves 303. A fixing member 305 is movably sleeved on the left outer surface of the filter plate 302. Bolts 306 are threaded around the inside of the fixing member 305. Four threaded holes 307 are opened on the left side of the filter element 301, so that the filter plate 302 can be pulled to the left, causing the positioning posts 304 to slide to the left inside the positioning groove 303, thereby allowing the filter plate 302 to detach from the filter element 301.

[0045] Please see Figures 1 to 9 In one embodiment, all four bolts 306 are matched with threaded holes 307. A pump 308 is provided on the rear side of the filter element 301. An oil inlet pipe 309 is fixedly installed on the rear side of the pump 308. The other end of the oil inlet pipe 309 is fixedly installed on the rear side of the oil tank 203. The pump 308 can be started by the power supply system of the pump 308, so that when it is running, it can draw out the lubricating oil filtered inside the filter element 301 and re-inject it into the oil tank 203 through the oil inlet pipe 309.

[0046] Working principle: During use, when the motor body 1 vibrates, the support plate 101 presses down on the telescopic column 102 and the first return spring 103 on the base 104, causing them to retract. As the support plate 101 descends, the first slider 106 simultaneously presses down on the cross rod 107, allowing the cross rod 107 to flip via its internal rotating shaft. When the cross rod 107 flips, the hinge pulls the first slider 106 to slide outward on the inner surface of the first slide groove 105. At the same time, the hinge pulls the second slider 108 to slide outward on the outer surface of the slide rod 109. When the second slider 108 slides, it compresses the second return spring 110, causing it to retract and buffer the motor body 1. The structure of the first return spring 103 and the cross rod 107 effectively buffers the vibration of the motor body 1, reducing the impact force transmitted to the motor body 1, thereby protecting the motor body 1 from excessive mechanical impact and extending its service life. In use, personnel can first inject lubricating oil into the oil tank 203 through the oil injection pipe 204. When the support plate 101 descends, it will press down the first push block 2, allowing it to slide on top of the second push block 201. Simultaneously, the first push block 2 can push the second push block 201 to the right, allowing it to slide to the right through the second slide groove 202. When the second push block 201 slides, the push plate 207 can squeeze the third return spring 208, causing it to contract. At the same time, the push plate 207 can squeeze the pressing end of the press pump 206, thus allowing the pressing end of the press pump 206 to draw out the lubricating oil inside the oil tank 203 through the oil outlet pipe 205. Lubricating oil is injected into the sponge 211 inside the sleeve 210 through the first hose 209. When the output shaft of the motor body 1 rotates, it will rotate inside the sleeve 210 through the bearing 212. At the same time, lubricating oil can seep out through the sponge 211 to lubricate the output shaft. Through the arrangement of the first push block 2 and the sponge 211, the lubricating oil can be accurately drawn from the oil tank 203 and injected into the sponge 211 inside the sleeve 210. The sponge 211 can slowly release the lubricating oil to ensure that the output shaft receives uniform and continuous lubrication during rotation. This reduces the wear of the output shaft when the motor body 1 rotates and further extends its service life.During use, when the output shaft is lubricated by the sponge 211, excess lubricating oil on the surface of the output shaft will drip onto the inner bottom side of the sleeve 210. This lubricating oil can then be transported to the interior of the filter element 301 via the second hose 3, where it will be filtered by the filter plate 302. At this point, the operator can start the pump 308 via its power supply system. During operation, the pump 308 will extract the filtered lubricating oil from inside the filter element 301 and re-inject it into the oil tank 203 through the oil inlet pipe 309. The operator can also reverse the bolt 306 to disengage it from the threaded hole 307 and pull the fixing piece 305 to move it to the right. The filter plate 302 can be removed from the left side of the filter element 301 and simultaneously from the filter plate 302. Then, the personnel can pull the filter plate 302 to the left, causing the positioning column 304 to slide to the left inside the positioning groove 303, thereby allowing the filter plate 302 to be removed from the filter element 301 for replacement. Through the structure of the filter element 301 and the fixing element 305, the filtered lubricating oil can be reinjected into the oil tank 203 through the pump 308 for recycling, reducing the waste of lubricating oil. At the same time, the personnel can easily disassemble and replace the filter plate 302, which facilitates the maintenance work and greatly reduces the labor intensity of the personnel.

[0047] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A novel energy-saving propulsion motor for electric tugboats, comprising a motor body (1), wherein support plates (101) are provided on both sides of the bottom of the motor body (1), characterized in that, Also includes; Telescopic columns (102) are fixedly installed on both sides of the bottom of the two support plates (101), and first return springs (103) are fixedly installed on both sides of the bottom of the two support plates (101). Bases (104) are fixedly installed on the other end of the four first return springs (103) and the four telescopic columns (102). Two first slide grooves (105) are opened at the bottom of the support plate (101), and two first sliders (106) are slidably connected to both sides of the inner surface of the two first slide grooves (105). The four first sliders (106) are divided into two groups of two. Two cross pillars (107) are hinged inside the first slider (106), and two second sliders (108) are hinged on both sides of the bottom of the two cross pillars (107). The four second sliders (108) are divided into two groups of two. Two slide rods (109) are slidably connected inside the two sets of second sliders (108). The two slide rods (109) are fixedly installed on the top of the base (104). The outer sides of the four second sliders (108) are fixedly installed with second return springs (110). The other ends of the four second return springs (110) are fixedly installed on the top of the base (104). The bottom of each of the two support plates (101) is fixedly installed with a first push block (2), and the bottom of each of the two first push blocks (2) is slidably connected with a second push block (201). The top two sides of the base (104) are provided with second sliding grooves (202), and the bottom of each of the two second push blocks (201) is slidably connected to the inner surface of the second sliding groove (202). An oil tank (203) is provided on the top right side of the base (104), an oil injection pipe (204) is fixedly installed on the top right side of the oil tank (203), an oil outlet pipe (205) is fixedly installed on the left side of the oil tank (203), and a press pump (206) is provided on the outer surface of the left side of the oil outlet pipe (205). A push plate (207) is provided on the left side of the push pump (206). The push plate (207) is located on the right side of the two second push blocks (201). Two third return springs (208) are fixedly installed on the right side of the push plate (207). The other ends of the two third reset springs (208) are fixedly installed on the top right side of the base (104). The top of the press pump (206) is provided with a first hose (209). The outer surface of the other end of the first hose (209) is fixedly fitted with a sleeve (210). The right side of the sleeve (210) is located on the left side of the motor body (1).

2. The novel energy-saving propulsion motor for electric tugboats according to claim 1, characterized in that: The sleeve (210) is provided with a bearing (212) inside, and the inner ring of the bearing (212) is provided on the outer surface of the output shaft of the motor body (1). The other end of the first hose (209) is provided with a sponge (211).

3. The novel energy-saving propulsion motor for electric tugboats according to claim 2, characterized in that: The sponge (211) is disposed inside the sleeve (210), and the bottom of the sponge (211) is movably connected to the outer surface of the output shaft of the motor body (1). A second hose (3) is disposed on the bottom side inside the sleeve (210), and a filter element (301) is disposed at the other end of the second hose (3).

4. The novel energy-saving propulsion motor for electric tugboats according to claim 3, characterized in that: The bottom of the filter element (301) is fixedly installed on the top left side of the base (104). The filter element (301) is movably embedded with a filter plate (302). Positioning grooves (303) are provided on both sides of the inner wall of the filter element (301). Positioning columns (304) are fixedly installed on both sides of the filter plate (302).

5. The novel energy-saving propulsion motor for electric tugboats according to claim 4, characterized in that: Both positioning posts (304) are matched with the positioning groove (303). A fixing member (305) is movably fitted on the left outer surface of the filter plate (302). Bolts (306) are threaded around the inside of the fixing member (305). Four threaded holes (307) are opened on the left side of the filter (301).

6. The novel energy-saving propulsion motor for electric tugboats according to claim 5, characterized in that: All four bolts (306) are matched with the threaded holes (307). A pump (308) is provided on the rear side of the filter element (301). An oil inlet pipe (309) is fixedly installed on the rear side of the pump (308). The other end of the oil inlet pipe (309) is fixedly installed on the rear side of the oil tank (203).

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