Rear cylinder body structure with oil fed from side face

Abstract

The utility model provides a rear cylinder body structure with oil fed from the side face, and belongs to the technical field of breaking hammers. The rear cylinder body solves the technical problems that an oil pipe of an existing rear cylinder body with oil fed from the upper side is prone to damage, and oil leakage is caused. The rear cylinder body structure comprises a rear cylinder body, oil pipe seats and oil pipe joints, an oil inlet hole and an oil return hole are formed in the left side face and the right side face of the rear cylinder body respectively, the oil pipe seats are fixedly connected to the oil inlet hole and the oil return hole, first oil holes are formed in the oil pipe seats, and the oil pipe joints are installed at the outer ends of the oil pipe seats and connected with oil pipes. And a second oil hole communicated with the first oil hole is formed in the oil pipe joint. The distance between the oil inlet pipe and the oil return pipe is increased, mutual friction is avoided, hydraulic impact is neutralized, and the breakage rate of the oil pipes is reduced; the overall length of the oil pipe is reduced, pressure borne by the oil pipe is reduced, and oil leakage of the oil pipe is avoided; and the oil pipe seat can be fixed by a fastener, so that the oil pipe seat is more stably connected with the rear cylinder body.

Description

Technical Field

[0001] The utility model belongs to the technical field of breaking hammers, in particular to a rear cylinder body with oil inlet from the side. Background Art

[0002] At present, the oil inlet and return holes in the hydraulic breaker are generally set on the aerial survey of the rear cylinder body, and the oil pipe is fixed on the rear cylinder body through a pressure plate type oil pipe seat and an oil pipe pressure plate, such as Figure 8-10 As shown, the pressure plate type oil pipe seat is between the rear cylinder body and the oil pipe, and plays the role of connecting the oil pipe and the rear cylinder body. The oil pipe pressure plate is located on the oil pipe, and fixes the oil pipe on the pressure plate type oil pipe seat.

[0003] However, since the oil pipe seat is located on the upper side of the rear cylinder body, the oil pipe enters the rear cylinder body from the side of the shell. If the pressure plate type oil pipe seat shown in the figure above is used, there are several problems as follows:

[0004] At this time, the hydraulic shock exerts a greater pressure on the side of the oil pipe, which can easily damage the oil pipe and cause oil leakage;

[0005] Such oil pipes are heavy and press on the oil pipe seat, which can easily cause damage to the oil pipe and cause oil leakage;

[0006] The distance between the oil inlet pipe and the oil return pipe is relatively close, and the oil inlet pipe and the oil return pipe rub and collide with each other during operation, which increases the hydraulic shock of the hydraulic oil and easily causes damage to the oil pipe and oil leakage;

[0007] If a 45% inclined oil pipe pressure plate is used, it will interfere with the silent housing and cannot be installed.

[0008] Therefore, how to optimize the connection structure between the oil pipe and the rear cylinder body, reduce the impact of hydraulic shock on the oil pipe, reduce the pressure on the oil pipe, avoid oil leakage, and increase the service life of the oil pipe and the oil pipe seat have become technical problems that need to be solved urgently. Summary of the invention

[0009] In view of the deficiencies in the prior art, the utility model aims to provide a rear cylinder structure with a more stable connection structure, an oil pipe that is not prone to rupture and oil leakage, and a longer service life of the oil pipe.

[0010] The purpose of the utility model can be achieved through the following technical solutions:

[0011] A rear cylinder structure with oil inlet from the side, comprising a rear cylinder, wherein an oil inlet passage and an oil return passage are arranged in the rear cylinder, and an oil inlet hole communicating with the oil inlet passage and an oil return hole communicating with the oil return passage are arranged on the rear cylinder, characterized in that: it also comprises an oil pipe seat and an oil pipe joint, wherein the oil inlet hole and the oil return hole are respectively arranged on the left and right sides of the rear cylinder, and the oil inlet hole and the oil return hole are both fixedly connected with an oil pipe seat,

[0012] The oil pipe seat is provided with a first oil hole connected to the oil inlet hole or the oil return hole.

[0013] The oil pipe joint is installed at the outer end of the oil pipe seat, the oil pipe joint is connected to the oil pipe, and a second oil hole is arranged in the oil pipe joint, and the second oil hole can be communicated with the first oil hole.

[0014] In the rear cylinder structure, the oil inlet hole and the oil return hole are moved from the upper side to the two sides of the rear cylinder, so that the oil pipe will not be blocked by the hydraulic breaker shell during installation, which is convenient for loading and unloading; at the same time, the distance between the oil inlet pipe and the oil return pipe is increased, which avoids the mutual friction of the oil pipes during operation, neutralizes the hydraulic impact of a part of the hydraulic oil, makes the structure more stable, and reduces the breakage rate of the oil pipe; this design can also reduce the overall length of the oil pipe, thereby reducing the pressure on the oil pipe, avoiding oil leakage of the oil pipe, and increasing the service life of the oil pipe; when the oil pipe seat is connected to the left and right sides of the cylinder body, there is no need to worry about drilling holes that will touch the oil inlet channel or the oil return channel, and more fasteners can be designed to fix the oil pipe seat, so that the connection between the oil pipe seat and the rear cylinder body is more stable.

[0015] The installation of the oil inlet hole on the left or right side of the rear cylinder body is determined according to the actual positions of the oil inlet passage and the oil return passage of the rear cylinder body. When the oil inlet passage of the rear cylinder body is close to the left side of the rear cylinder body, the oil inlet hole is arranged on the left side of the rear cylinder body, and the oil return hole is arranged on the right side of the rear cylinder body. Similarly, when the oil inlet passage is close to the right side of the rear cylinder body, the oil inlet hole is arranged on the right side of the rear cylinder body, and the oil return hole is arranged on the left side of the rear cylinder body.

[0016] In the above-mentioned rear cylinder structure with side oil inlet, a third oil hole connected to the first oil hole is provided on the side wall of the outer end of the oil pipe seat, the oil pipe joint is sleeved on the outer end of the oil pipe seat and can rotate around the oil pipe seat, an annular oil groove is provided in the oil pipe joint, and the second oil hole and the third oil hole are both connected to the oil groove.

[0017] The rotatable oil pipe joint in the rear cylinder structure can make the oil pipe joint rotate around the oil pipe seat. When the oil pipe joint is connected to the oil pipe, the oil pipe will also rotate with the oil pipe joint. On the one hand, it can reduce the fatigue stress of the oil pipe and facilitate installation and disassembly. On the other hand, it can further reduce the overall length of the oil pipe, thereby reducing the pressure on the oil pipe, avoiding oil leakage of the oil pipe and increasing the service life of the oil pipe.

[0018] In the above-mentioned rear cylinder structure with side oil inlet, the inner end of the oil pipe seat is provided with a protruding connecting flange, and a plurality of connecting holes axially passing through the connecting flange are arranged at intervals along the circumference. The connecting flange and the rear cylinder are fixedly connected by screws passing through the connecting holes.

[0019] Since the rear cylinder body structure arranges the oil inlet hole and the oil return hole on the side of the rear cylinder body, the influence of the oil inlet channel and the oil return channel is eliminated, so that the above-mentioned connecting holes can be arranged in a circular array with the central axis of the connecting flange as the center, and the connecting flange and the rear cylinder body are fixedly connected by matching screws. More screws make the connection between the oil pipe seat and the rear cylinder body more firm and stable.

[0020] In the above-mentioned rear cylinder structure with side oil inlet, the outer end of the oil inlet hole or the oil return hole is enlarged to form a mounting groove, the inner end of the oil pipe seat can be inserted into the mounting groove, and an annular first sealing groove is provided on the outer peripheral wall of the inner end of the oil pipe seat, and a first sealing ring is provided in the first sealing groove. The first sealing groove is provided on the oil pipe seat on the inner side of the connecting flange.

[0021] The cooperation between the first sealing ring and the first sealing groove can improve the sealing performance after the connection between the oil pipe seat and the oil inlet hole or the oil return hole, avoid oil leakage at the connection between the oil pipe seat and the rear cylinder body, and help improve the stability of the connection between the oil pipe seat and the rear cylinder body.

[0022] In the above-mentioned rear cylinder structure with side oil inlet, the outer end portion of the oil pipe seat is reduced in diameter to form a step portion, the third oil hole is arranged on the step portion, the oil pipe joint is sleeved on the step portion, and the outer end of the step portion is provided with a limit piece that can axially fix the oil pipe joint.

[0023] The cooperation between the step portion and the limit member can fix the oil pipe joint axially to the outer end of the oil pipe seat, thereby avoiding axial shaking of the oil pipe joint, which is beneficial to improving the stability of the connection between the oil pipe seat and the oil pipe joint, and at the same time does not affect the circumferential rotation between the oil pipe seat and the oil pipe joint; the limit member can be a retaining spring or a positioning pin.

[0024] In the above-mentioned rear cylinder structure with side oil inlet, the oil pipe joint includes a seat connection part and a tube connection part, the seat connection part is provided with a through hole passing through it, the oil groove is provided on the hole wall of the through hole, second sealing grooves are provided on the hole walls on both sides of the oil groove, a second sealing ring is provided in the second sealing groove, and the second oil hole is provided in the tube connection part.

[0025] When the hydraulic breaker is working, the hydraulic oil in the oil inlet pipe enters the oil groove of the seat connection part through the second oil hole in the pipe connection part, then enters the oil inlet hole through the third oil hole and the first oil hole of the oil pipe seat, and finally enters the oil inlet channel of the rear cylinder body; the hydraulic oil in the oil return channel of the rear cylinder body enters the oil pipe seat through the oil return hole, then enters the oil groove of the seat connection part in the oil pipe joint through the first oil hole and the third oil hole in the oil pipe seat, and finally enters the oil return pipe through the second oil hole of the pipe connection part. The design of the second sealing groove and the second sealing ring on the above-mentioned oil pipe joint can enhance the sealing of the connection between the oil pipe joint and the oil pipe seat, and seal the oil leakage at the connection between the oil pipe joint and the oil pipe seat.

[0026] In the above-mentioned rear cylinder structure with side oil inlet, the middle or rear portion of the rear cylinder is thickened upward to form a bulge, and the oil inlet hole and the oil return hole are arranged in the middle or rear portion of the rear cylinder.

[0027] The design of the above-mentioned protrusion can increase the thickness of the middle or rear part of the rear cylinder body, provide sufficient vertical space for the setting of the oil inlet hole and the oil return hole, avoid the oil inlet hole or the oil return hole being connected with the screw hole on the rear cylinder body for installing the long screw, causing oil leakage, and ensure that there is sufficient spacing between the oil inlet hole or the oil return hole and the screw hole, thereby ensuring that the rear cylinder body has sufficient structural strength and avoiding cracks between the oil inlet hole or the oil return hole and the screw hole, which may cause oil leakage; at the same time, the design also provides sufficient vertical space for the connection between the oil pipe seat and the rear cylinder body, so that the connection between the oil pipe seat and the rear cylinder body can have more screws, thereby improving the firmness and stability of the connection.

[0028] In the above-mentioned rear cylinder structure with side oil inlet, the lower edge of the oil inlet hole is not lower than the lower edge of the oil inlet channel, and the lower edge of the oil return hole is not lower than the lower edge of the oil return channel.

[0029] This design can support and cooperate with the design of the protrusion, and can further increase the distance between the oil inlet hole and the oil return hole and the corresponding screw hole, thereby improving the structural strength of the rear cylinder body and reducing the risk of oil leakage.

[0030] Compared with the prior art, the technical effects of the utility model are:

[0031] 1. In the utility model, the oil inlet hole and the oil return hole are moved from the upper side to the two sides of the rear cylinder body, so that the oil pipe will not be blocked by the hydraulic breaker shell during installation, which is convenient for loading and unloading.

[0032] 2. The utility model increases the distance between the oil inlet pipe and the oil return pipe, avoids the mutual friction of the oil pipes during operation, neutralizes the hydraulic impact of a part of the hydraulic oil, makes the structure more stable, and reduces the breakage rate of the oil pipes.

[0033] 3. The utility model reduces the overall length of the oil pipe, thereby reducing the pressure on the oil pipe, avoiding oil leakage of the oil pipe and increasing the service life of the oil pipe.

[0034] 4. The utility model connects the oil pipe seat to the left and right sides of the cylinder body, so there is no need to consider whether the drilling will touch the oil inlet channel or the oil return channel. More fasteners can be designed to fix the oil pipe seat, making the connection between the oil pipe seat and the rear cylinder body more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0036] Figure 2 It is an overall sectional view of the utility model.

[0037] Figure 3 The utility model is an exploded structural schematic diagram of an oil pipe seat and an oil pipe joint.

[0038] Figure 4 This is a cross-sectional view of the oil pipe seat and the oil pipe joint of the utility model. Figure 1 .

[0039] Figure 5 This is a cross-sectional view of the oil pipe seat and the oil pipe joint of the utility model. Figure 2 .

[0040] Figure 6 yes Figure 2 A partial enlarged view of point A in the middle.

[0041] Figure 7 yes Figure 2 A partial enlarged view of point B in the middle.

[0042] Figure 8 It is a cross-sectional view of an existing rear cylinder upper pressure plate type oil pipe seat and an oil pipe pressure plate in the background technology.

[0043] Fig. 9 It is a schematic diagram of a pressure plate type oil pipe seat of an existing rear cylinder body in the background technology.

[0044] Fig.10 It is a schematic diagram of an existing oil pipe pressing plate of a rear cylinder body in the background technology.

[0045] In the figure, 1, rear cylinder body; 11, oil inlet hole; 12, oil return hole; 13, mounting groove; 14, protrusion; 15, oil inlet channel; 16, oil return channel; 17, screw hole; 2, oil pipe seat; 21, first oil hole; 22, step portion; 221, third oil hole; 23, connecting flange; 231, connecting hole; 24, first sealing groove; 25, first sealing ring; 3, oil pipe joint; 31, seat connecting portion; 311, through hole; 312, oil groove; 313, second sealing groove; 314, second sealing ring; 32, pipe connecting portion; 321, second oil hole. DETAILED DESCRIPTION

[0046] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0047] The rear cylinder body structure with side oil inlet includes a rear cylinder body 1, in which an oil inlet channel 15 and an oil return channel 16 are provided, and an oil inlet hole 11 connected to the oil inlet channel 15 and an oil return hole 12 connected to the oil return channel 16 are provided on the rear cylinder body 1, and also includes an oil pipe seat 2 and an oil pipe joint 3, the oil inlet hole 11 and the oil return hole 12 are respectively arranged on the left and right sides of the rear cylinder body 1, the oil inlet hole 11 and the oil return hole 12 are fixedly connected with the oil pipe seat 2, the oil pipe seat 2 is provided with a first oil hole 21 connected to the oil inlet hole 11 or the oil return hole 12, the oil pipe joint 3 is installed on the outer end of the oil pipe seat 2, the oil pipe joint 3 is connected to the oil pipe, and a second oil hole 321 is provided in the oil pipe joint 3, and the second oil hole 321 can be connected to the first oil hole 21. In the present rear cylinder structure, the oil inlet hole 11 and the oil return hole 12 are moved from the upper side to the two sides of the rear cylinder 1, so that the oil pipe will not be blocked by the hydraulic breaker shell during installation, which is convenient for loading and unloading; at the same time, the distance between the oil inlet pipe and the oil return pipe is increased, which avoids the mutual friction of the oil pipes during operation, neutralizes the hydraulic impact of a part of the hydraulic oil, makes the structure more stable, and reduces the breakage rate of the oil pipe; this design can also reduce the overall length of the oil pipe, thereby reducing the pressure on the oil pipe, avoiding oil leakage in the oil pipe, and increasing the service life of the oil pipe; when the oil pipe seat 2 is connected to the left and right sides of the cylinder body, there is no need to worry about drilling holes that will touch the oil inlet channel 15 or the oil return channel 16, and more fasteners can be designed to fix the oil pipe seat 2, so that the connection between the oil pipe seat 2 and the rear cylinder 1 is more stable.

[0048] The installation of the oil inlet hole 11 on the left or right side of the rear cylinder body 1 is determined according to the positions of the oil inlet passage 15 and the oil return passage 16 of the actual rear cylinder body 1. When the oil inlet passage 15 of the rear cylinder body 1 is close to the left side of the rear cylinder body 1, the oil inlet hole 11 is arranged on the left side of the rear cylinder body 1, and the oil return hole 12 is arranged on the right side of the rear cylinder body 1. Similarly, when the oil inlet passage 15 is close to the right side of the rear cylinder body 1, the oil inlet hole 11 is arranged on the right side of the rear cylinder body 1, and the oil return hole 12 is arranged on the left side of the rear cylinder body 1.

[0049] like Figure 3-5 As shown, the side wall of the outer end of the oil pipe seat 2 is provided with a third oil hole 221 connected with the first oil hole 21, the oil pipe joint 3 is sleeved on the outer end of the oil pipe seat 2 and can rotate around the oil pipe seat 2, and an annular oil groove 312 is provided in the oil pipe joint 3, and the second oil hole 321 and the third oil hole 221 are both connected with the oil groove 312. The rotatable oil pipe joint 3 in the rear cylinder structure can make the oil pipe joint 3 rotate around the oil pipe seat 2. When the oil pipe joint 3 is connected to the oil pipe, the oil pipe will also rotate with the oil pipe joint 3. On the one hand, it can reduce the fatigue stress of the oil pipe and facilitate installation and disassembly. On the other hand, it can further reduce the overall length of the oil pipe, thereby reducing the pressure on the oil pipe, avoiding oil leakage of the oil pipe, and increasing the service life of the oil pipe. Further, there can be multiple third oil holes 221.

[0050] like Figure 3 and Figure 4 As shown, the inner end of the oil pipe seat 2 is provided with a protruding connection flange 23, and a plurality of connection holes 231 are arranged on the connection flange 23 at intervals along the circumferential direction to penetrate the connection flange 23 axially, and the connection flange 23 and the rear cylinder body 1 are fixedly connected by screws passing through the connection holes 231. Since the rear cylinder body structure arranges the oil inlet hole 11 and the oil return hole 12 on the side of the rear cylinder body 1, the influence of the oil inlet channel 15 and the oil return channel 16 is eliminated, so that the above-mentioned connection holes 231 can be arranged in a circular array with the central axis of the connection flange 23 as the center, and the connection flange 23 and the rear cylinder body 1 are fixedly connected by adapted screws, and more screws make the connection between the oil pipe seat 2 and the rear cylinder body 1 more firm and stable.

[0051] like Figure 6 As shown, the outer end of the oil inlet hole 11 or the oil return hole 12 is enlarged to form a mounting groove 13, and the inner end of the oil pipe seat 2 can be inserted into the mounting groove 13. An annular first sealing groove 24 is provided on the outer peripheral wall of the inner end of the oil pipe seat 2, and a first sealing ring 25 is provided in the first sealing groove 24. The first sealing groove 24 is provided on the oil pipe seat 2 on the inner side of the connecting flange 23. The cooperation of the first sealing ring 25 and the first sealing groove 24 can make the sealing between the oil pipe seat 2 and the oil inlet hole 11 or the oil return hole 12 better after the connection, avoid oil leakage at the connection between the oil pipe seat 2 and the rear cylinder body 1, and help to improve the stability of the connection between the oil pipe seat 2 and the rear cylinder body 1.

[0052] like Figure 3 As shown, the outer end of the oil pipe seat 2 is reduced in diameter to form a step portion 22, the third oil hole 221 is provided on the step portion 22, the oil pipe joint 3 is sleeved on the step portion 22, and the outer end of the step portion 22 is provided with a stopper that can axially fix the oil pipe joint 3. The step portion 22 and the stopper cooperate to make the oil pipe joint 3 axially fixedly connected to the outer end of the oil pipe seat 2, avoiding axial shaking of the oil pipe joint 3, which is conducive to improving the stability of the connection between the oil pipe seat 2 and the oil pipe joint 3, and also does not affect the circumferential rotation between the oil pipe seat 2 and the oil pipe joint 3; the stopper can be a retaining spring or a positioning pin.

[0053] like Figure 3-5As shown, the oil pipe joint 3 includes a seat connection part 31 and a pipe connection part 32. The seat connection part 31 is provided with a through hole 311 passing through the seat connection part 31. The oil groove 312 is provided on the hole wall of the through hole 311. Second sealing grooves 313 are provided on the hole walls on both sides of the oil groove 312. A second sealing ring 314 is provided in the second sealing groove 313. The second oil hole 321 is provided in the pipe connection part 32. When the hydraulic breaker is working, the hydraulic oil in the oil inlet pipe enters the oil groove 312 of the seat connection part 31 through the second oil hole 321 in the pipe connection part 32, then enters the oil inlet hole 11 through the third oil hole 221 and the first oil hole 21 of the oil pipe seat 2, and finally enters the oil inlet channel 15 of the rear cylinder body 1; the hydraulic oil in the oil return channel 16 of the rear cylinder body 1 enters the oil pipe seat 2 through the oil return hole 12, then enters the oil groove 312 of the seat connection part 31 in the oil pipe joint 3 through the first oil hole 21 and the third oil hole 221 in the oil pipe seat 2, and finally enters the oil return pipe through the second oil hole 321 of the pipe connection part 32. The design of the second sealing groove 313 and the second sealing ring 314 on the above-mentioned oil pipe joint 3 can enhance the sealing of the connection between the oil pipe joint 3 and the oil pipe seat 2, and seal the oil leakage at the connection between the oil pipe joint 3 and the oil pipe seat 2.

[0054] like Figure 1 and Figure 2 As shown, the middle or rear part of the rear cylinder body 1 is thickened upward to form a protrusion 14, and the oil inlet hole 11 and the oil return hole 12 are arranged in the middle or rear part of the rear cylinder body 1; the lower edge of the oil inlet hole 11 is not lower than the lower edge of the oil inlet channel 15, and the lower edge of the oil return hole 12 is not lower than the lower edge of the oil return channel 16. The design of the above-mentioned protrusion 14 can increase the thickness of the middle or rear part of the rear cylinder body 1, provide sufficient vertical space for the setting of the oil inlet hole 11 and the oil return hole 12, avoid the oil inlet hole 11 or the oil return hole 12 being connected with the screw hole 17 on the rear cylinder body 1 for installing the long screw, causing oil leakage, and ensure that there is a sufficient distance between the oil inlet hole 11 or the oil return hole 12 and the screw hole 17, thereby ensuring that the rear cylinder body 1 has sufficient structural strength, avoiding cracks between the oil inlet hole 11 or the oil return hole 12 and the screw hole 17 and causing oil leakage; at the same time, the design also provides sufficient vertical space for the connection between the oil pipe seat 2 and the rear cylinder body 1, so that the connection between the oil pipe seat 2 and the rear cylinder body 1 can have more screws, thereby improving the firmness and stability of the connection; the design can support and cooperate with the design of the protrusion 14, and can further increase the distance between the oil inlet hole 11 and the oil return hole 12 and the corresponding screw hole 17, thereby improving the structural strength of the rear cylinder body 1 and reducing the risk of oil leakage.

[0055] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A rear cylinder structure with side oil inlet, comprising a rear cylinder (1), wherein the rear cylinder (1) is provided with an oil inlet passage (15) and an oil return passage (16), and the rear cylinder (1) is provided with an oil inlet hole (11) communicating with the oil inlet passage (15) and an oil return hole (12) communicating with the oil return passage (16). Features: It also comprises an oil pipe seat (2) and an oil pipe joint (3), wherein the oil inlet hole (11) and the oil return hole (12) are respectively arranged on the left and right sides of the rear cylinder body (1), the oil inlet hole (11) and the oil return hole (12) are both fixedly connected to the oil pipe seat (2), the oil pipe seat (2) is provided with a first oil hole (21) which is in communication with the oil inlet hole (11) or the oil return hole (12), the oil pipe joint (3) is mounted on the outer end of the oil pipe seat (2), the oil pipe joint (3) is connected to the oil pipe, and a second oil hole (321) is arranged in the oil pipe joint (3), and the second oil hole (321) can be in communication with the first oil hole (21).

2. A rear cylinder structure with side oil inlet according to claim 1, Features: A third oil hole (221) communicating with the first oil hole (21) is provided on the side wall of the outer end of the oil pipe seat (2); the oil pipe joint (3) is sleeved on the outer end of the oil pipe seat (2) and is rotatable around the oil pipe seat (2); an annular oil groove (312) is provided in the oil pipe joint (3); the second oil hole (321) and the third oil hole (221) are both communicating with the oil groove (312).

3. A rear cylinder structure with side oil inlet according to claim 2, Features: The inner end of the oil pipe seat (2) is provided with a protruding connection flange (23), and the connection flange (23) is provided with a plurality of connection holes (231) axially penetrating the connection flange (23) at intervals in the circumferential direction. The connection flange (23) and the rear cylinder body (1) are fixedly connected by screws passing through the connection holes (231).

4. A rear cylinder structure with side oil inlet according to claim 3, Features: The outer end of the oil inlet hole (11) or the oil return hole (12) is enlarged to form a mounting groove (13), and the inner end of the oil pipe seat (2) can be inserted into the mounting groove (13). An annular first sealing groove (24) is provided on the outer peripheral wall of the inner end of the oil pipe seat (2), and a first sealing ring (25) is provided in the first sealing groove (24). The first sealing groove (24) is provided on the oil pipe seat (2) on the inner side of the connecting flange (23).

5. A rear cylinder structure with side oil inlet according to claim 2, Features: The outer end portion of the oil pipe seat (2) is reduced in diameter to form a step portion (22), the third oil hole (221) is provided on the step portion (22), the oil pipe joint (3) is sleeved on the step portion (22), and the outer end of the step portion (22) is provided with a stopper capable of axially fixing the oil pipe joint (3).

6. A rear cylinder structure with side oil inlet according to any one of claims 2 to 5, Features: The oil pipe joint (3) comprises a seat connection part (31) and a pipe connection part (32); the seat connection part (31) is provided with a through hole (311) penetrating the seat connection part; the oil groove (312) is provided on the hole wall of the through hole (311); second sealing grooves (313) are provided on the hole walls on both sides of the oil groove (312); a second sealing ring (314) is provided in the second sealing groove (313); and the second oil hole (321) is provided in the pipe connection part (32).

7. A rear cylinder structure with side oil inlet according to any one of claims 2 to 5, Features: The middle or rear part of the rear cylinder body (1) is thickened upward to form a protrusion (14), and the oil inlet hole (11) and the oil return hole (12) are arranged in the middle or rear part of the rear cylinder body (1).

8. A rear cylinder structure with side oil inlet according to claim 7, Features: The lower edge of the oil inlet hole (11) is not lower than the lower edge of the oil inlet channel (15), and the lower edge of the oil return hole (12) is not lower than the lower edge of the oil return channel (16).

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