Face gear automatic clamping mechanism

Abstract

The utility model provides an automatic face gear clamping mechanism which comprises a connecting base, the connecting base is fixed on a machine tool workbench, an installing base is connected to the connecting base, an installing cavity is formed in the installing base, a piston is installed in the installing cavity and divides the installing cavity into an upper cavity and a lower cavity, and one end, located in the lower cavity, of the piston is connected with a pull rod. The pull rod extends out of the mounting seat, a face gear is mounted on the outer side end of the mounting seat on the pull rod, and a positioning piece is connected between the face gear and the pull rod; a first liquid through hole and a second liquid through hole are formed in the mounting base, one end of the first liquid through hole is communicated with the lower cavity, one end of the second liquid through hole is communicated with the upper cavity, the other end of the first liquid through hole is provided with a first connector, the other end of the second liquid through hole is provided with a second connector, and the first connector and the second connector are connected with an oil supply assembly. According to the clamping mechanism, the piston is pushed to do reciprocating motion in the mounting cavity through the oil control loop, rapid fixing of the face gear is achieved, and the fixing efficiency of the face gear is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of machining, specifically belongs to a face gear automatic clamping mechanism. BACKGROUND

[0002] Face gear is a new type of gear structure, and currently domestic face gear machining has gear machining and gear grinding machining. In the gear machining and gear grinding machining process, the face gear needs to be fixed on the machine tool rotary worktable first, and the coaxiality of the face gear and the rotary worktable needs to be corrected to ensure that the tooth distribution after machining is coaxial with the rotary center, thereby meeting the machining precision requirement.

[0003] Because the shape feature of the face gear is a disc type structure, the clamping mode of the face gear currently mainly adopts screw fastening type installation and chuck fastening installation. Among them, the screw fastening structure is that a tooling table is arranged, the tooling table is fixed on the machine tool worktable through screws, the coaxiality of the tooling and the worktable is adjusted, then the face gear to be machined is installed on the tooling table, and the coaxiality of the face gear and the worktable is adjusted. Although the tooling table can complete the fixing of the face gear to be machined, the installation efficiency is low when batch machining, and a plurality of screws need to be disassembled and assembled each time. After installation, the coaxiality of the face gear and the machine tool rotary worktable needs to be adjusted by using a measuring instrument, and the adjustment needs to be completed through multiple adjustments, so the adjustment efficiency is low, and there is a great error in the adjustment process through manual adjustment. The chuck fastening structure is that a transition plate is arranged, the transition plate is installed on the machine tool rotary worktable, the coaxiality of the transition plate and the worktable is adjusted, then a finished product chuck is installed on the transition plate, then the face gear to be machined is fixed through the clamping jaw of the chuck, and the coaxiality of the face gear and the worktable is adjusted through the adjustment of the radial position of each clamping jaw. However, in the adjustment process, the installer also manually adjusts the clamping jaw on the chuck to adjust the coaxiality of the face gear and the worktable by using a measuring instrument, so the adjustment efficiency is low and the adjustment precision is low. UTILITY MODEL CONTENTS

[0004] In order to solve the problem that the coaxiality of the face gear and the worktable needs to be manually adjusted in the process of fixing the face gear on the machine tool machining table, the adjustment efficiency and the adjustment precision are low, the utility model provides a face gear automatic clamping mechanism.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] The utility model provides a face gear automatic clamping mechanism, including connecting seat, connecting seat is fixed on the machine tool worktable, the side that is connected with the mounting seat of connecting seat away from machine tool worktable,

[0007] The mounting seat is provided with a mounting cavity, a piston is mounted in the mounting cavity, the piston divides the mounting cavity into an upper chamber and a lower chamber, a pull rod is connected to an end head of the piston at the lower chamber, the pull rod extends out of the mounting seat, a face gear is mounted on an end head of the pull rod at the outside of the mounting seat, and a positioning piece is connected between the face gear and the pull rod.

[0008] The connecting seat is provided with a first liquid passage and a second liquid passage, the first liquid passage communicates with the lower chamber, the second liquid passage communicates with the upper chamber, a first connector is arranged on the first liquid passage, a second connector is arranged on the second liquid passage, and an oil supply assembly is connected to the first connector and the second connector.

[0009] Preferably, the positioning piece is a sleeve.

[0010] Preferably, the sleeve is an annular sleeve, and an open groove is arranged on the annular sleeve.

[0011] Preferably, the sleeve is a spring steel sleeve.

[0012] Preferably, a support seat is arranged on the connecting seat, and the support seat is fixed to a machine tool connected to the machine tool workbench.

[0013] Preferably, an oil inlet hole and an oil outlet hole are arranged on the mounting seat, one end of the oil inlet hole communicates with the upper chamber, the other end of the oil inlet hole communicates with one end of the oil outlet hole, the other end of the oil outlet hole penetrates through the outer wall of the mounting seat, and a first plug is mounted on the port of the oil outlet hole at the outside of the mounting seat.

[0014] The oil outlet hole communicates with the second liquid passage.

[0015] Preferably, a mounting groove is arranged on the end face of the mounting seat which is attached to the connecting seat, and a third sealing ring is mounted in the mounting groove.

[0016] Preferably, a first annular groove is arranged on the outer wall of the piston near the top of the upper chamber, and a first sealing ring is mounted in the first annular groove.

[0017] A second annular groove is arranged on the outer wall of the piston near the top of the lower chamber, and a second sealing ring is mounted in the second annular groove.

[0018] Preferably, the pull rod comprises a connecting column and a tapered column, the tapered column is connected to one end of the connecting column at an end head of small diameter, the face gear is mounted on an end head of large diameter of the tapered column, and the other end of the connecting column is connected to the piston.

[0019] Preferably, the oil supply assembly comprises an oil storage tank, two oil supply pumps are connected to the oil storage tank through oil supply pipes, one of the oil supply pumps is connected to the first liquid passage through an oil supply pipe, and the other oil supply pump is connected to the second liquid passage through an oil supply pipe.

[0020] Compared with the prior art, the face gear automatic clamping mechanism has the following beneficial technical effects:

[0021] The face gear automatic clamping mechanism is provided, and the clamping mechanism supplies oil to the upper chamber and the lower chamber separated by the piston in the mounting seat through an oil supply assembly to form an oil control circuit. The oil supply assembly supplies oil to the upper chamber or the lower chamber, thereby driving the piston to reciprocate in the mounting cavity. The piston drives the pull rod to move from the center of the face gear, and the face gear is fixed on the top end face of the mounting seat, so that the face gear is quickly fixed. During use of the clamping mechanism, positioning adjustment is only needed when the connecting seat is fixed on the machine tool machining table. During replacement of the face gear, repeated positioning adjustment is not needed, the fixing time of the face gear is shortened, the fixing efficiency of the face gear is improved, and the machining efficiency of the face gear is improved.

[0022] Further, the positioning member is an expansion sleeve, the expansion sleeve is an annular sleeve, the annular sleeve is provided with an open groove, and has a tightening effect. The pull rod can more stably fix the face gear through the expansion sleeve, the stability of the clamping mechanism in fixing the face gear is improved, and the pull rod can fix face gears of different specifications through the expansion sleeve, thereby improving the practicability of the clamping mechanism.

[0023] Further, the clamping mechanism is provided with a support seat on the connecting seat, and the clamping mechanism is connected to the machine tool through the support seat and the machine tool workbench, so that the stability of the clamping mechanism in being installed on the machine tool workbench is improved.

[0024] Further, the clamping mechanism is provided with a third sealing ring between the mounting seat connecting seats, a first sealing ring is arranged on the outer wall of the piston and close to the top of the upper chamber, and a second sealing ring is arranged on the outer wall of the piston and close to the top of the lower chamber. The sealing property of the clamping mechanism is improved through the first sealing ring, the second sealing ring and the third sealing ring, oil channeling in the clamping mechanism is prevented, and the stability of the clamping mechanism in operation is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The face gear automatic clamping mechanism is provided, and the clamping mechanism supplies oil to the upper chamber and the lower chamber separated by the piston in the mounting seat through an oil supply assembly to form an oil control circuit. The oil supply assembly supplies oil to the upper chamber or the lower chamber, thereby driving the piston to reciprocate in the mounting cavity. The piston drives the pull rod to move from the center of the face gear, and the face gear is fixed on the top end face of the mounting seat, so that the face gear is quickly fixed. During use of the clamping mechanism, positioning adjustment is only needed when the connecting seat is fixed on the machine tool machining table. During replacement of the face gear, repeated positioning adjustment is not needed, the fixing time of the face gear is shortened, the fixing efficiency of the face gear is improved, and the machining efficiency of the face gear is improved.

[0026] Figure 2 The face gear automatic clamping mechanism is provided, and the clamping mechanism supplies oil to the upper chamber and the lower chamber separated by the piston in the mounting seat through an oil supply assembly to form an oil control circuit. The oil supply assembly supplies oil to the upper chamber or the lower chamber, thereby driving the piston to reciprocate in the mounting cavity. The piston drives the pull rod to move from the center of the face gear, and the face gear is fixed on the top end face of the mounting seat, so that the face gear is quickly fixed. During use of the clamping mechanism, positioning adjustment is only needed when the connecting seat is fixed on the machine tool machining table. During replacement of the face gear, repeated positioning adjustment is not needed, the fixing time of the face gear is shortened, the fixing efficiency of the face gear is improved, and the machining efficiency of the face gear is improved.

[0027] Figure 3A side view structure schematic view of a face gear automatic clamping mechanism is provided in the utility model;

[0028] Figure 4 A top view structure schematic view of a face gear automatic clamping mechanism is provided in the utility model;

[0029] Figure 5 A front view sectional structure schematic view of a face gear automatic clamping mechanism is provided in the utility model;

[0030] Figure 6 A structure schematic view of a connecting seat in a face gear automatic clamping mechanism is provided in the utility model;

[0031] Figure 7 A connecting structure schematic view of a pull rod and a expansion sleeve in a face gear automatic clamping mechanism is provided in the utility model;

[0032] Figure 8 A connecting structure schematic view of a pull rod and a expansion sleeve in a face gear automatic clamping mechanism is provided in the utility model;

[0033] In the drawing: 1, expansion sleeve;2, pull rod;3, first sealing ring;4, second sealing ring;5, third sealing ring;6, connecting seat;7, first screw;8, first joint;9, support seat;10, second screw;11, face gear;12, mounting seat;13, first plug;14, piston;15, third screw;16, second joint;17, fourth sealing ring;18, second plug;19, first liquid passage hole;20, second liquid passage hole. DETAILED DESCRIPTION

[0034] Hereinafter, only certain exemplary embodiments are simply described.As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the utility model.Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0035] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0036] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more than two, unless otherwise specifically limited.

[0037] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature of the second feature can include the direct contact of the first and second features, or it can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature of the second feature include the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature of the second feature include the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0039] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0040] Referring to Figures 1-8 The utility model provides a face gear automatic clamping mechanism, including connecting seat 6, be provided with fixed hole on connecting seat 6, install fixed part in fixed hole, through fixed part fixes connecting seat 6 on machine tool workstation, adjusts the coaxial degree of machine tool workstation and connecting seat 6 in installation process, so that the coaxial degree of machine tool workstation and connecting seat 6 reaches the requirement, the bottom end surface of connecting seat 6 and the upper end surface of machine tool workstation are pasted, and the fixed part is first screw 7, one side of connecting seat 6 away from machine tool workstation is connected with mounting seat 12, mounting seat 12 is fixed on connecting seat 6 through third screw 15, namely mounting seat 12 is connected on the upper end surface of connecting seat 6, mounting cavity is provided in mounting seat 12, and the mounting cavity is arranged at the center position of mounting seat 12, and the upper end head of mounting cavity penetrates the upper end surface of mounting seat 12, and the lower end head of mounting cavity penetrates the bottom end surface of mounting seat 12;

[0041] Referring toFigures 1-8 , the piston 14 is installed in the installation cavity, the piston 14 can move vertically along the installation cavity, the piston 14 divides the installation cavity into an upper chamber and a lower chamber, a pull rod 2 is connected to one end of the piston 14 located in the lower chamber, the upper end of the pull rod 2 extends from the top of the installation cavity to the outside of the mounting seat 12, a face gear 11 is installed on the outer end of the pull rod 2 located outside the mounting seat 12, and a positioning piece is connected between the pull rod 2 and the face gear 11; the pull rod 2 comprises a connecting column and a tapered column, the tapered column is connected to the upper end of the connecting column at one end with a small diameter, the tapered column is installed at the center of the face gear 11 at one end with a large diameter, the bottom end surface of the face gear 11 is attached to the upper end surface of the mounting seat 12 to fix and position the face gear 11, and the other end of the connecting column is connected to the piston 14; when the face gear 11 is placed on the upper end surface of the mounting seat 12, the face gear 11 is fixed by pulling the pull rod 2 through the piston 14;

[0042] Referring to Figures 1-8The connecting seat 6 is provided with a first liquid passage hole 19 and a second liquid passage hole 20, the vertical section of the first liquid passage hole 19 and the second liquid passage hole 20 is a "T" shape, the first liquid passage hole 19 and the second liquid passage hole 20 have three ports, one end port of the first liquid passage hole 19 penetrates through the upper end face of the connecting seat 6 and communicates with the lower chamber in the mounting seat 12, the other end of the first liquid passage hole 19 penetrates through the lower end face of the connecting seat 6, and the second plug 18 is arranged on the end port of the first liquid passage hole 19, and the remaining one port of the first liquid passage hole 19 penetrates through the outer wall of the connecting seat 6 and is provided with the first connector 8 on the end port; one end port of the second liquid passage hole 20 penetrates through the upper end face of the connecting seat 6 and communicates with the upper chamber in the mounting seat 12, the other end of the second liquid passage hole 20 penetrates through the lower end face of the connecting seat 6, and the second plug 18 is also arranged on the end port of the first liquid passage hole 19, and the remaining one port of the second liquid passage hole 20 penetrates through the outer wall of the connecting seat 6 and is provided with the second connector 16 on the end port, the oil supply assembly is connected to the first connector 8 and the second connector 16, an oil control circuit is formed through the oil supply assembly, the second liquid passage hole 20 and the upper chamber, and an oil control circuit is formed through the oil supply assembly, the first liquid passage hole 19 and the lower chamber, so that the oil supply assembly supplies oil to the lower chamber through the first liquid passage hole 19, drives the piston 14 to move upward along the mounting cavity, and then drives the pull rod 2 to move upward, releases the fixation of the opposite gear 11, the oil supply assembly supplies oil to the upper chamber through the second liquid passage hole 20, drives the piston 14 to move downward along the mounting cavity, and then drives the pull rod 2 to move downward, clamps and fixes the opposite gear 11, through the above two oil control circuits, the quick fixation and replacement of the opposite gear 11 can be realized, the replacement efficiency of the opposite gear 11 on the machine tool machining table is improved, and since the coaxiality of the connecting seat 6 and the machine tool workbench is adjusted during installation, the fixation of the opposite gear 11 on the mounting seat 12 is from the central position, and the replacement process of the opposite gear 11 does not need to be repeatedly adjusted, the step of repeatedly adjusting the coaxiality of the opposite gear 11 and the machine tool workbench is avoided, and the replacement efficiency is improved.

[0043] Referring to Figure 8 The positioning member is a swelling sleeve 1, the swelling sleeve 1 is an annular sleeve, the annular sleeve is provided with an open slot, the swelling sleeve 1 is a spring steel sleeve, and the swelling sleeve 1 can play a role of swelling during fixation, so that the pull rod 2 fixes the opposite gear 11 more stably, and for different specifications of the opposite gear 11, the installation and clamping mechanism can fix different specifications of the opposite gear 11 by replacing the swelling sleeves 1 with different outer diameters, and the practicality of the installation and clamping mechanism is improved.

[0044] Referring to Figures 1-5The outer wall of the connecting seat 6 is provided with a support seat 9, the support seat 9 is fixed on the machine tool through the second screw 10, the outer wall of the connecting seat 6 is provided with a mounting ring groove, the fourth sealing ring 17 is mounted in the mounting ring groove, the fourth sealing ring 17 is provided with three equidistantly arranged from top to bottom along the outer wall of the connecting seat 6, the support seat 9 is provided with a through groove corresponding to the positions of the first joint 8 and the second joint 16, the first joint 8 and the second joint 16 extend to the outside of the support seat 9 through the through groove, the fourth sealing ring 17 can prevent the first joint 8 and the second joint 16 from mutual oil channeling during oil supply, causing pressure drop and preventing oil leakage.

[0045] Referring to Figure 5 The mounting seat 12 is provided with an oil supply hole and an oil discharge hole, one end of the oil supply hole is communicated with the upper chamber, the other end of the oil supply hole is communicated with one end of the oil discharge hole, the other end of the oil discharge hole penetrates the outer wall of the mounting seat 12, when the clamping mechanism is not used, the oil in the upper chamber can be discharged through the oil discharge hole, the first plug 13 is mounted on the port of the oil discharge hole located outside the mounting seat 12; the mounting seat 12 is also provided with an oil supply branch hole, one end of the oil supply branch hole is communicated with the oil discharge hole, the other end of the oil supply branch hole is communicated with the port of the second liquid passage 20 located on the upper end face of the connecting seat 6, so that the oil supply assembly can deliver oil to the upper chamber.

[0046] Referring to Figure 5 The mounting seat 12 is provided with a mounting groove on the side end face abutting the connecting seat 6, the third sealing ring 5 is mounted in the mounting groove, the sealing property between the mounting seat 12 and the connecting seat 6 is increased through the third sealing ring 5, the outer wall of the piston 14 is provided with a first annular groove at a position close to the top of the upper chamber, the first sealing ring 3 is mounted in the first annular groove; the outer wall of the piston 14 is provided with a second annular groove at a position close to the top of the lower chamber, the second sealing ring 4 is mounted in the second annular groove; the sealing property between the upper chamber and the lower chamber is increased through the first sealing ring 3 and the second sealing ring 4, the oil flow between the upper chamber and the lower chamber is prevented, and the stable operation of the piston 14 is affected.

[0047] The oil supply assembly comprises an oil storage tank, the oil storage tank is connected with two oil supply pumps through oil supply pipes, one of the oil supply pumps is connected with the first liquid passage 19 through an oil supply pipe, and the other oil supply pump is connected with the second liquid passage 20 through an oil supply pipe.

[0048] The basic principle and main features of the present application and the advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or basic features of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0049] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand. The above is only to illustrate the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification made on the basis of the technical solutions according to the technical idea of the present application falls within the protection scope of the claims of the present application.

Claims

1. A face gear automatic chucking mechanism characterized by comprising: Including connecting seat (6), connecting seat (6) is fixed on machine tool workbench, one side of connecting seat (6) is connected with mounting seat (12) away from machine tool workbench; The mounting seat (12) is provided with an installation cavity, the installation cavity is provided with a piston (14), the piston (14) divides the installation cavity into upper chamber and lower chamber, the piston (14) is connected with pull rod (2) on the end head of the lower chamber, the pull rod (2) extends outside the mounting seat (12), the face gear (11) is installed on the outer end head of the pull rod (2), the face gear (11) is connected with the positioning member between the pull rod (2); The connecting seat (6) is provided with a first liquid hole (19) and a second liquid hole (20), the first liquid hole (19) is communicated with the lower chamber, the second liquid hole (20) is communicated with the upper chamber, the first liquid hole (19) is provided with a first joint (8), the second liquid hole (20) is provided with a second joint (16), the first joint (8) and the second joint (16) are connected with oil supply assembly.

2. The automatic pinion gear clamping mechanism according to claim 1, wherein The positioning member is a sleeve (1).

3. A pinion automatic chucking mechanism according to claim 2, wherein The sleeve (1) is an annular sleeve, and the annular sleeve is provided with an open slot.

4. The automatic pinion gear chucking mechanism according to claim 2, wherein The sleeve (1) is a spring steel sleeve.

5. The automatic pinion gear chucking mechanism according to claim 1, wherein The connecting seat (6) is provided with a support seat (9), and the support seat (9) is fixed on the machine tool connected to the machine tool workbench.

6. A pinion automatic chucking mechanism according to claim 1, wherein The mounting seat (12) is provided with an oil inlet hole and an oil outlet hole, one end of the oil inlet hole is communicated with the upper chamber, the other end of the oil inlet hole is communicated with one end of the oil outlet hole, the other end of the oil outlet hole penetrates the outer wall of the mounting seat (12), and a first plug (13) is installed on the port outside the mounting seat (12) of the oil outlet hole. The oil outlet hole is communicated with the second liquid hole (20).

7. The automatic pinion gear chucking mechanism according to claim 1, wherein The mounting seat (12) is provided with a mounting groove on the side end face abutting the connecting seat (6), and the third sealing ring (5) is installed in the mounting groove.

8. The automatic pinion gear chucking mechanism according to claim 1, wherein A first annular groove is arranged on the top of the outer wall of the piston (14) close to the upper chamber, and the first sealing ring (3) is installed in the first annular groove. A second annular groove is arranged on the top of the outer wall of the piston (14) close to the lower chamber, and the second sealing ring (4) is installed in the second annular groove.

9. The automatic pinion gear chucking mechanism according to claim 1, wherein The pull rod (2) comprises a connecting column and a tapered column, one end of the connecting column is connected to one end of the connecting column, the tapered column is installed on the face gear (11) at one end of the large diameter, and the other end of the connecting column is connected to the piston (14).

10. The automatic pinion gear chucking mechanism according to claim 1, wherein The oil supply assembly comprises an oil storage tank, two oil supply pumps are connected to the oil storage tank through oil supply pipes, one of the oil supply pumps is connected to the first liquid hole (19) through an oil supply pipe, and the other oil supply pump is connected to the second liquid hole (20) through an oil supply pipe.

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