Rotary reciprocating motion conversion device

Abstract

This utility model relates to the field of air compressor technology and discloses a rotary reciprocating motion conversion device, including a main shaft body. A housing is provided on the outer side of the main shaft body. Multiple piston cylinders are fixedly connected to the surface of the housing. Each of the multiple piston cylinders is provided with a moving component. A cam roller body is rotatably connected inside the housing. A cam roller cover is provided on the top of the cam roller body. An upper cover is provided on the top of the cam roller cover. The upper cover is fixedly connected to the housing. A rotating component is provided at the bottom of the main shaft body. In this utility model, by adopting a combined mechanism of main shaft body, cam roller body, cam roller cover, piston rod, roller, housing and upper cover, and connected by bearings, it replaces the traditional crank-connecting rod mechanism, solving the problems of high noise and energy loss caused by the existing crank-connecting rod mechanism. At the same time, the connection stability is improved by bearings.

Description

Technical Field

[0001] This utility model relates to the field of air compressor technology, and in particular to a rotary reciprocating motion conversion device. Background Technology

[0002] In the existing technology, compressors are widely used equipment. They are closely related to all aspects of modern industry and life and are a general-purpose mechanical device that plays an important role. Compressors can be used in refrigeration, engines, gas transportation, chemical processes, machinery manufacturing, aquaculture, medical treatment, and various places where compressed gas needs to be transported or used.

[0003] Currently, the most commonly used air compressors are reciprocating air compressors and screw air compressors, both of which have certain shortcomings. Reciprocating compressors use the rotational motion of the crankshaft to drive the piston to reciprocate linearly to compress the gas in the cylinder. The connection structure between the piston and the crankshaft is a crank-connecting rod structure, and no balancing weight is placed on the machine. The bearing friction noise is relatively large and the stability is poor. Screw compressors have meshing friction in the cylinder rotor, and the rotation speed is high. It generates a lot of heat, which not only requires materials with high wear resistance, but also requires a large amount of cooling and lubricating oil during use, and oil-gas separation is also required. Therefore, screw compressors have high energy consumption, high cost, complex operation, and are more difficult to maintain and repair. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a rotary reciprocating motion conversion device, which aims to improve the problems of high energy consumption, large friction noise and poor stability of existing compressors.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a rotary reciprocating motion conversion device, including a main shaft body, a housing provided on the outer side of the main shaft body, a plurality of piston cylinders fixedly connected to the surface of the housing, a motion component provided inside each of the plurality of piston cylinders, a cam roller body rotatably connected inside the housing, a cam roller cover provided on the top of the cam roller body, an upper cover provided on the top of the cam roller cover, the upper cover being fixedly connected to the housing, and a rotating component provided at the bottom of the main shaft body.

[0006] By adopting the above technical solution, the main shaft body drives the cam roller body to rotate, and the internal four cam raceways drive the rollers to reciprocate, thereby causing the piston rod to drive the piston ring to compress the gas in the piston cylinder. The gas enters and exits through the valve plate and cylinder head. Through the concentric main shaft body and the four cam raceways arranged in the same plane, the motor can reciprocate four times per revolution, which improves efficiency and reduces noise and energy consumption. Moreover, it can achieve ultra-large displacement and ultra-high pressure compression by connecting multiple units in series.

[0007] Preferably, the motion component includes piston rings, which are slidably connected to the piston cylinder. Each piston ring is fixedly connected to a piston rod on the side near the main shaft body, and a roller is fixedly connected inside the piston rod.

[0008] Preferably, valve plates are fixedly connected to the side of the plurality of piston cylinders away from the main shaft body, and cylinder heads are fixedly connected to the side of the plurality of valve plates away from the main shaft body.

[0009] Preferably, the rotating assembly includes an oil seal cover, which is fixedly connected to the housing. An oil seal body is provided on the inner diameter of the oil seal cover, and a plurality of spindle lower bearings are provided on the end of the oil seal body away from the cam roller body.

[0010] Preferably, the surfaces of the plurality of lower spindle bearings are fixedly connected to the housing, and the bottom end of the inner diameter of the lower spindle bearings at the bottom is fixedly connected to a plurality of spindle locking nuts, and the plurality of spindle locking nuts are fixedly connected to the spindle body.

[0011] Preferably, a bearing seat is fixedly connected to the top of the upper cover, and a main shaft bearing is provided on the side of the bearing seat near the main shaft. The outer ring of the main shaft bearing is fixedly connected to the inner ring of the bearing seat. A roller locking nut is fixedly connected to the top of the cam roller body, and the roller locking nut is fixedly connected to the main shaft body.

[0012] Preferably, a plurality of oil seal covers are fixedly connected to the surface of the main shaft body, and a linear bearing is fixedly connected inside each of the plurality of oil seal covers. The linear bearings are slidably connected to the adjacent piston rods.

[0013] Preferably, a motor is provided at the bottom end of the spindle body, and the output end of the motor is fixedly disposed between the spindle body and the spindle body.

[0014] Preferably, the cam roller body has four cam raceways inside, the lower surfaces of the multiple rollers slide within the four cam raceways, and the upper surfaces of the multiple rollers are slidably connected to the cam roller cover.

[0015] Preferably, the inner diameter of the cam roller body is fixedly connected to the main shaft body, and the cam roller body is fixedly connected to the roller locking nut.

[0016] This utility model has the following beneficial effects:

[0017] 1. In this utility model, by adopting a combination mechanism of main shaft body, cam roller body, cam roller cover, piston rod, roller, housing and upper cover, and connected by bearings, the traditional crank connecting rod mechanism is replaced, which solves the problems of high noise and energy loss caused by the existing crank connecting rod mechanism. At the same time, the connection stability is improved by bearings.

[0018] 2. In this utility model, a concentric spindle design is adopted to replace the eccentric crankshaft in the prior art. Since the concentric spindle does not need to be balanced and counterweighted like the eccentric crankshaft, the balance problem caused by the center of gravity shift of the eccentric crankshaft is solved structurally, reducing the vibration of the equipment during operation and improving stability.

[0019] 3. In this utility model, through the cooperation of the cam roller body, piston rod and roller, the piston rod performs four reciprocating motions for every revolution of the motor. Compared with the frequency of one reciprocating motion per revolution of the crank connecting rod mechanism in the prior art, the conversion efficiency of the motor's useful work is greatly improved. At the same time, the cam roller body, piston rod and roller are arranged symmetrically in the same plane. When the cam performs positive useful work, no additional balance adjustment is required, which further solves the noise, energy loss and balance problems of the crank connecting rod mechanism in the prior art.

[0020] 4. In this utility model, by using a linear bearing to guide the piston rod linearly, the piston ring guidance method in the prior art is replaced, which avoids the wear problem caused by direct friction between the piston ring and the cylinder, extends the service life of the components, improves the stability of equipment operation, and reduces maintenance costs and performance degradation caused by wear.

[0021] 5. In this utility model, by adopting the same plane arrangement of the moving components, a layout of four groups or positive integer multiples of four can be achieved (taking 16 groups as an example). By increasing the number of cylinders, the gas compression displacement is significantly improved, solving the problem that the piston air compressor in the prior art cannot achieve ultra-large displacement, and expanding the application of the equipment in high-flow gas compression scenarios.

[0022] 6. In this utility model, by adopting a concentric shaft design for the main shaft body, the main shafts of each unit can be connected in series through a coupling to realize a layout of single motor driving dual units or multiple units in series. This design not only reduces the energy consumption of multi-motor drive, but also realizes ultra-large displacement piston air compressors and multi-stage booster and ultra-high pressure piston air compressors through multi-stage series connection. It solves the problem of high noise and high energy loss generated by piston air compressors under high pressure conditions in the prior art, and meets the high pressure gas compression requirements. Attached Figure Description

[0023] Figure 1 This is a perspective view of the rotary reciprocating motion conversion device proposed in this utility model;

[0024] Figure 2 This is an exploded view of the rotary reciprocating motion conversion device proposed in this utility model;

[0025] Figure 3 This is a schematic diagram of the piston cylinder of the rotary reciprocating motion conversion device proposed in this utility model;

[0026] Figure 4This is a schematic diagram of the cam roller body of the rotary reciprocating motion conversion device proposed in this utility model;

[0027] Figure 5 This is a schematic diagram of the lower bearing of the main shaft of the rotary reciprocating motion conversion device proposed in this utility model;

[0028] Figure 6 This is a schematic diagram of the cam roller cover of the rotary reciprocating motion conversion device proposed in this utility model;

[0029] Figure 7 This is a schematic diagram of the roller of the rotary reciprocating motion conversion device proposed in this utility model.

[0030] Legend:

[0031] 1. Spindle locking nut; 2. Lower spindle bearing; 3. Oil seal body; 4. Oil seal cover; 5. Spindle body; 6. Cylinder head; 7. Valve plate; 8. Piston ring; 9. Piston cylinder body; 10. Oil seal gland; 11. Linear bearing; 12. Piston rod; 13. Roller; 14. Housing; 15. Cam roller body; 16. Cam roller cover; 17. Top cover; 18. Roller locking nut; 19. Upper spindle bearing; 20. Bearing housing; 21. Motor. Detailed Implementation

[0032] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] Reference Figures 1-2 An embodiment of this utility model provides a rotary reciprocating motion conversion device, including a main shaft body 5, a housing 14 disposed on the outside of the main shaft body 5, a plurality of piston cylinders 9 fixedly connected to the surface of the housing 14, each of the plurality of piston cylinders 9 being provided with a motion component, a cam roller body 15 rotatably connected inside the housing 14, a cam roller cover 16 disposed on the top of the cam roller body 15, an upper cover 17 disposed on the top of the cam roller cover 16, the upper cover 17 being fixedly connected to the housing 14, and a rotating component disposed at the bottom of the main shaft body 5.

[0034] Specifically, when the main shaft body 5 rotates, it drives the cam roller body 15 to rotate. The four cam raceways inside the cam roller body 15 rotate accordingly. The lower surface of the roller 13 slides in the four cam raceways of the cam roller body 15, and the upper surface is slidably connected to the cam roller cover 16. The roller 13 drives the piston rod 12 to reciprocate under the rotation drive of the cam roller body 15. In practical applications, according to different working requirements and compression efficiency requirements, the cam roller body 15 can be equipped with double cam raceways, triple cam raceways, or more cam raceways. The number of piston cylinders 9 and moving components can also be adapted and adjusted according to the number of cam raceways.

[0035] Reference Figure 2 and Figure 3 The moving component includes a piston ring 8, which is slidably connected to the piston cylinder 9. A piston rod 12 is fixedly connected to the side of the piston ring 8 near the main shaft body 5, and a roller 13 is fixedly connected inside the piston rod 12.

[0036] Specifically, the main shaft body 5 drives the cam roller body 15 to rotate, and the four cam raceways inside the cam roller body 15 rotate accordingly and push the roller 13. The piston rod 12 performs reciprocating linear motion under the drive of the roller 13, and the piston ring 8 completes the intake and compression of gas when it reciprocates in the piston cylinder 9.

[0037] Reference Figure 2 and Figure 3 Multiple piston cylinders 9 are fixedly connected to valve plates 7 on the side away from the main shaft body 5, and multiple valve plates 7 are fixedly connected to cylinder heads 6 on the side away from the main shaft body 5.

[0038] Specifically, the piston rod 12 reciprocates under the drive of the roller 13 and pushes the piston ring 8 to slide inside the piston cylinder 9. When the piston ring 8 moves towards the main shaft body 5, the space inside the piston cylinder 9 increases, forming a negative pressure. At this time, the intake valve inside the valve plate 7 opens, and external air enters the piston cylinder 9 through the cylinder head 6. When the piston ring 8 moves away from the main shaft body 5, the space inside the piston cylinder 9 shrinks, and the gas is compressed. The compressed gas pushes the exhaust valve inside the valve plate 7 to open and is discharged from the cylinder head 6 through the valve plate 7. The cylinder head 6 and the valve plate 7 are fixedly connected to form a gas inlet and outlet channel. The valve plate 7 controls the unidirectional flow of gas through the internal valve plate to ensure that the intake and exhaust processes do not interfere with each other, thereby realizing the function of compressing and transporting gas inside the piston cylinder 9.

[0039] Reference Figure 2 and Figure 5 The rotating assembly includes an oil seal cover 4, which is fixedly connected to the housing 14. An oil seal body 3 is provided on the inner diameter of the oil seal cover 4. Multiple spindle lower bearings 2 are provided on the end of the oil seal body 3 away from the cam roller body 15.

[0040] Specifically, when the main spindle body 5 rotates, the oil seal body 3 of the inner diameter of the oil seal cover 4 is sleeved on the main spindle body 5, which plays a sealing role to prevent the lubricating oil in the inner cavity of the housing 14 from leaking, and at the same time to prevent external dust from entering. The inner diameter of the lower bearing 2 of the main spindle is matched with the main spindle body 5, and the surface of the lower bearing 2 of the main spindle is fixed to the housing 14, thereby supporting the bottom end of the main spindle body 5 and reducing friction during rotation, so that the main spindle body 5 can rotate stably at high speed, ensuring that the main spindle body 5 maintains coaxiality when driving the cam roller body 15 and other components, avoiding vibration or offset caused by insufficient bottom support, and thus ensuring the stability and reliability of the entire rotary reciprocating motion conversion device.

[0041] Reference Figure 2 and Figure 5 Multiple spindle lower bearings 2 are fixedly connected to the housing 14. Multiple spindle locking nuts 1 are fixedly connected to the bottom of the inner diameter of the bottom spindle lower bearing 2. Multiple spindle locking nuts 1 are fixedly connected to the spindle body 5.

[0042] Specifically, after the main spindle body 5 passes through the inner diameter of the lower main spindle bearing 2, multiple main spindle locking nuts 1 are installed at the bottom of the inner diameter of the lower main spindle bearing 2. The main spindle locking nuts 1 are fixedly connected to the bottom of the main spindle body 5. The main spindle body 5 and the inner ring of the lower main spindle bearing 2 are pressed together by the main spindle locking nuts 1, so that the main spindle body 5 and the lower main spindle bearing 2 form a rigid connection. When the equipment is running, the main spindle locking nuts 1 prevent the main spindle body 5 from moving under the action of axial force, ensuring that the main spindle body 5 drives the cam roller body 15 and other components to rotate stably, avoiding increased noise or component wear caused by loose connection, thereby improving the operational reliability and service life of the equipment.

[0043] Reference Figure 1 and Figure 2 The top of the cover 17 is fixedly connected to a bearing seat 20. A main shaft bearing 19 is provided on the side of the bearing seat 20 near the main shaft body 5. The outer ring of the main shaft bearing 19 is fixedly connected to the inner ring of the bearing seat 20. A cam roller body 15 is fixedly connected to the top of the cam roller body 15. The cam roller body 15 is fixedly connected to the main shaft body 5.

[0044] Specifically, when installing the equipment, the user fixes the upper cover 17 to the housing 14. The upper spindle bearing 19 is installed in the bearing seat 20 at the top of the upper cover 17. The surface of the upper spindle bearing 19 is fixed to the bearing seat 20, and its inner diameter matches the spindle body 5, forming support for the top of the spindle body 5. After the cam roller body 15 is fitted onto the spindle body 5, it is fixedly connected to the spindle body 5 using the roller locking nut 18. After tightening the roller locking nut 18, the cam roller body 15 is axially pressed, causing it to rotate synchronously with the spindle body 5. The bearing 19 provides radial support and rotational guidance for the main shaft body 5, ensuring the coaxiality of the cam roller body 15 during rotation. When the motor 21 drives the main shaft body 5 to rotate, the cam roller body 15 rotates at high speed with the main shaft body 5 through the roller locking nut 18. The bearing 19 on the main shaft reduces rotational friction and bears radial force. The fixed connection between the upper cover 17 and the bearing seat 20 ensures the stability of the top support and prevents the upper end of the main shaft body 5 from shaking. This allows the cam roller body 15 to stably drive the roller 13 and piston rod 12, ensuring the reliable operation of the entire device.

[0045] Reference Figure 1 and Figure 2 Multiple oil seal caps 10 are fixedly connected to the surface of the housing 14. Linear bearings 11 are fixedly connected inside each of the multiple oil seal caps 10. The linear bearings 11 are slidably connected to the adjacent piston rods 12.

[0046] Specifically, when the spindle body 5 rotates, the piston rod 12 reciprocates under the drive of the cam roller body 15 and the roller 13. The inner ring of the linear bearing 11 slides with the cylindrical part of the piston rod 12, and the outer ring is fixed with the oil seal cover 10, thereby reducing the friction between the piston rod 12 and the housing 14 and ensuring that the piston rod 12 moves stably along the direction of the linear bearing 11. The oil seal cover 10 not only fixes the linear bearing 11, but also helps to seal the gap between the housing 14 and the spindle body 5 to prevent lubricating oil leakage. The high-precision guiding effect of the linear bearing 11 improves the motion accuracy of the piston rod 12 and avoids wear of the piston ring 8 or gas leakage caused by shaking, making the entire reciprocating motion mechanism run more smoothly and efficiently.

[0047] Reference Figure 1 A motor 21 is installed at the bottom of the spindle body 5, and the output end of the motor 21 is fixedly installed between the spindle body 5 and the spindle body 5.

[0048] Specifically, the starter motor 21 drives the main shaft body 5 to rotate, ensuring direct power transmission. The main shaft body 5, as the power core, drives the cam roller body 15 connected to it to rotate synchronously. The cam roller body 15 drives the roller 13 to move through the internal plum blossom-shaped raceway, thereby causing the piston rod 12 to reciprocate to complete gas compression. Multiple main shaft bodies 5 are connected in series through a coupling to realize the layout of single motor 21 driving dual units and multiple units in series. Through multi-stage series connection, ultra-large displacement piston air compressors and multi-stage booster and ultra-high pressure piston air compressors are realized.

[0049] Reference Figure 2 , Figure 4 and Figure 7 The cam roller body 15 has four cam raceways inside, and the lower surfaces of multiple rollers 13 slide in the four cam raceways. The upper surfaces of multiple rollers 13 are slidably connected to the cam roller cover 16.

[0050] Specifically, motor 21 drives the main shaft body 5 to rotate, which in turn drives the cam roller body 15 to rotate synchronously. The four cam raceways inside the cam roller body 15 rotate accordingly. The lower surfaces of multiple rollers 13 roll in the cam raceways, while the upper surfaces slide in contact with the cam roller cover 16. Driven by the cam raceways, the rollers 13 generate radial motion, which in turn pushes the piston rod 12 to perform reciprocating linear motion. One end of the piston rod 12 passes through the housing 14 and is guided by the linear bearing 11, while the other end is connected to the piston ring 8, allowing the piston ring 8 to complete gas compression within the piston cylinder 9. The design of the four cam raceways ensures that for every rotation of the cam roller body 15, the rollers 13 drive the piston rod 12 to perform four reciprocating motions, improving compression efficiency, reducing friction loss, and ensuring efficient operation of the device.

[0051] Reference Figure 4 and Figure 5 The inner diameter of the cam roller body 15 is fixedly connected to the main shaft body 5, and the cam roller body 15 is fixedly connected to the roller locking nut 18.

[0052] Specifically, the cam roller body 15 rotates synchronously with the main shaft body 5. The roller locking nut 18 is screwed into the thread at the top of the main shaft body 5 to axially press and fix the cam roller body 15 to prevent axial movement during rotation. When the motor 21 drives the main shaft body 5 to rotate, the cam roller body 15 rotates at high speed. The four cam raceways inside drive the rollers 13 to move, which in turn drives the piston rod 12 to reciprocate. The roller locking nut 18 ensures the reliability of the connection between the cam roller body 15 and the main shaft body 5, avoiding power transmission failure or movement inaccuracy due to loosening.

[0053] Working principle: The starting motor 21 drives the main shaft body 5 to rotate, and the main shaft body 5 drives the cam roller body 15 to rotate synchronously. The four cam raceways inside the cam roller body 15 rotate accordingly, pushing the roller 13 to roll in the raceway. The radial movement of the roller 13 drives the piston rod 12 to reciprocate linearly through the housing 14. The piston rod 12 is guided by the linear bearing 11, and the other end is fixed to the piston ring 8 and pushes it to reciprocate in the piston cylinder 9.

[0054] When the piston ring 8 moves away from the main shaft body 5, the space inside the piston cylinder 9 shrinks and compresses the gas. The compressed gas pushes the exhaust valve in the valve plate 7 to open and is discharged through the cylinder head 6. When the piston ring 8 moves closer to the main shaft body 5, the space inside the piston cylinder 9 increases and forms a negative pressure. The intake valve in the valve plate 7 opens and allows external air to enter through the cylinder head 6, realizing the intake, compression and discharge of gas. At the same time, by connecting multiple units in series, ultra-large displacement and ultra-high pressure compression can be achieved.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotary reciprocating motion conversion device, comprising a main shaft body (5), characterized in that: The main shaft body (5) is provided with a housing (14) on the outside. Multiple piston cylinders (9) are fixedly connected to the surface of the housing (14). Motion components are provided inside the multiple piston cylinders (9). A cam roller body (15) is rotatably connected inside the housing (14). A cam roller cover (16) is provided on the top of the cam roller body (15). A top cover (17) is provided on the top of the cam roller cover (16). The top cover (17) is fixedly connected to the housing (14). A rotating component is provided at the bottom of the main shaft body (5).

2. The rotary reciprocating motion conversion device according to claim 1, characterized in that: The motion assembly includes a piston ring (8), which is slidably connected to the piston cylinder (9). A piston rod (12) is fixedly connected to the side of the piston ring (8) near the main shaft body (5), and a roller (13) is fixedly connected inside the piston rod (12).

3. The rotary reciprocating motion conversion device according to claim 1, characterized in that: Each of the piston cylinders (9) is fixedly connected to a valve plate (7) on the side away from the main shaft body (5), and each of the valve plates (7) is fixedly connected to a cylinder head (6) on the side away from the main shaft body (5).

4. The rotary reciprocating motion conversion device according to claim 1, characterized in that: The rotating assembly includes an oil seal cover (4), which is fixedly connected to the housing (14). An oil seal body (3) is provided on the inner diameter of the oil seal cover (4), and multiple spindle lower bearings (2) are provided on the end of the oil seal body (3) away from the cam roller body (15).

5. The rotary reciprocating motion conversion device according to claim 4, characterized in that: Multiple spindle lower bearings (2) are fixedly connected to the housing (14) and multiple spindle locking nuts (1) are fixedly connected to the bottom of the inner diameter of the spindle lower bearings (2) at the bottom. Multiple spindle locking nuts (1) are fixedly connected to the spindle body (5).

6. The rotary reciprocating motion conversion device according to claim 1, characterized in that: The top of the upper cover (17) is fixedly connected to a bearing seat (20). The bearing seat (20) is provided with a main shaft bearing (19) on the side near the main shaft body (5). The outer ring of the main shaft bearing (19) is fixedly connected to the inner ring of the bearing seat (20). The top of the cam roller body (15) is fixedly connected to a roller locking nut (18). The roller locking nut (18) is fixedly connected to the main shaft body (5).

7. The rotary reciprocating motion conversion device according to claim 1, characterized in that: Multiple oil seal caps (10) are fixedly connected to the surface of the housing (14), and linear bearings (11) are fixedly connected inside each of the multiple oil seal caps (10). The linear bearings (11) are slidably connected to the adjacent piston rods (12).

8. The rotary reciprocating motion conversion device according to claim 1, characterized in that: A motor (21) is provided at the bottom of the main spindle body (5), and the output end of the motor (21) is fixedly disposed between the main spindle body (5).

9. The rotary reciprocating motion conversion device according to claim 1, characterized in that: The cam roller body (15) has four cam raceways inside, the lower surfaces of multiple rollers (13) slide in the four cam raceways, and the upper surfaces of multiple rollers (13) are slidably connected to the cam roller cover (16).

10. The rotary reciprocating motion conversion device according to claim 1, characterized in that: The inner diameter of the cam roller body (15) is fixedly connected to the main shaft body (5), and the cam roller body (15) is fixedly connected to the roller locking nut (18).

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