An arc-shaped edge track

Abstract

The present invention discloses an arc-shaped edge track, which includes an arc-shaped track body; one end of the arc-shaped track body is provided with a mounting groove, and a positioning block is slidably connected in the mounting groove. A connecting rod is fixedly arranged on the side wall of one end of the positioning block close to the inside of the mounting groove. The other end of the arc-shaped track body away from the mounting groove is provided with a positioning hole slidably adapted to the positioning block. A limiting component is arranged in the positioning block, and a limiting hole slidably adapted to the limiting component is arranged in the positioning hole. When in use, when it is necessary to connect the track body with other tracks for use, the positioning hole and the positioning block are placed correspondingly, and then the connecting rod is slid to make the positioning block move out of the mounting groove and extend into the positioning hole. Subsequently, the limiting component is adapted to the limiting hole, realizing the adaptive installation of the track body and other tracks, and avoiding the problem that the track body or other tracks are relatively displaced when the track body or other tracks are fixed subsequently.

Description

Technical Field

[0001] The present invention relates to the technical field of tracks, and more particularly to an arc-edge track. Background Art

[0002] An arc-edge track is a specially designed track system used to provide smooth and precise guidance in applications that require curved motion. In many applications of industrial automation, linear motion is common. However, in some applications, arc motion is needed, or two intersecting or parallel linear motions need to be connected by arc motion to achieve seamless connection of linear motion.

[0003] In the prior art, when docking two sets of tracks, generally, the tracks are first placed at their corresponding predetermined positions, and the joints of the two sets of tracks are aligned. Subsequently, the tracks are fixed at the predetermined positions by bolts. However, in actual use, after placing adjacent tracks in alignment, during the subsequent process of fixing with bolts, due to uneven application of force when tightening the bolts, the tracks may be forced to undergo slight displacement, resulting in misalignment of the final joints, thereby affecting subsequent use.

[0004] Therefore, it is necessary to provide an arc-edge track to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an arc-edge track to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: an arc-edge track, including an arc-track body; an installation groove is provided at one end of the arc-track body, a positioning block is slidably connected in the installation groove, a connecting rod is fixedly provided on the side wall of the positioning block close to one end inside the installation groove, a positioning hole slidably adapted to the positioning block is provided at the other end of the arc-track body away from the installation groove, a limiting component is provided inside the positioning block, and a limiting hole slidably adapted to the limiting component is provided in the positioning hole;

[0007] When the positioning block moves towards the positioning hole, the limiting component moves towards the limiting hole.

[0008] As a further solution of the present invention: the limiting component includes two groups of limiting blocks; the limiting blocks are symmetrically arranged along the center of the positioning block, and the two groups of limiting blocks are respectively slidably arranged at the upper and lower ends of the positioning block, the limiting blocks are slidably adapted to the limiting holes, and the limiting blocks are arranged inside the side wall of the positioning block close to the positioning hole.

[0009] As a further solution of the present invention: a fixed plate is fixedly arranged at the center inside the positioning block. One end of the fixed plate close to the limiting block is rotatably connected with a telescopic plate. The telescopic plates are symmetrically arranged along the center of the fixed plate and are arranged at the upper and lower ends of the fixed plate. One end of the telescopic plate far from the fixed plate is rotatably connected with a movable plate. Two sides of one end of the movable plate far from the telescopic plate are rotatably connected with connecting plates. One side of the connecting plate far from the movable plate is slidably connected with the side wall of the fixed plate.

[0010] As a further solution of the present invention: the telescopic plate comprises an inner plate and an outer plate; the inner plate is rotatably connected with the side wall of the fixed plate, the outer plate is sleeved around the periphery of the inner plate far from the fixed plate, and one end of the outer plate far from the inner plate is rotatably connected with the movable plate.

[0011] As a further solution of the present invention: a straight plate is slidably arranged at the center of the fixed plate. An elastic cord is fixedly arranged between the connecting plate and the straight plate. One end of the straight plate far from the connecting plate is slidably connected with a wedge-shaped block.

[0012] As a further solution of the present invention: a spring block is arranged at one end of the installation groove far from the positioning block. An opening is arranged at one end of the spring block close to the positioning block. A stop block is fixedly arranged at the bottom of one side of the opening close to the positioning block.

[0013] As a further solution of the present invention: a bayonet is arranged on one side of the limiting block and is arranged on the side of the limiting block far from the straight plate. A clamping plate is elastically connected inside the side wall of the positioning block. Two ends of one side of the clamping plate close to the limiting block are provided with clamping blocks which are slidably matched with the bayonet.

[0014] As a further solution of the present invention: two sides of the center of the clamping plate are slidably attached to a pushing block. The pushing block is slidably arranged inside the side wall of the positioning block. One end side wall of the pushing block far from the clamping plate is fixedly provided with an extension rod. The extension rod is arranged on the side of the pushing block far from the limiting block, and one end of the extension rod far from the pushing block is fixedly connected with a pushing rod.

[0015] As a further solution of the present invention: one end of the pushing rod far from the clamping plate slides out of the side wall of the positioning block. A semi-circular groove corresponding to the pushing rod is arranged inside the installation groove, and a matching groove corresponding to the pushing rod is arranged inside the positioning hole.

[0016] As a further solution of the present invention: a storage cavity is arranged inside the end part of the positioning block and is arranged at the position corresponding to the pushing rod. A piston plate is symmetrically and hermetically slidably arranged inside the storage cavity along the center. One side of the piston plate close to the pushing rod is fixedly connected with the pushing rod. A spray head communicated with the storage cavity is arranged at one end of the positioning block far from the connecting rod.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: When in use, when it is necessary to connect the track body with other tracks, the positioning holes and positioning blocks are placed correspondingly, and then the connecting rod is slid so that the positioning block moves out of the installation groove and extends into the positioning hole. Subsequently, the limiting component is adapted to the limiting hole, so as to realize the fitting installation of the track body and other tracks, thus avoiding the problem that the track body or other tracks are relatively offset when the track body or other tracks are fixed subsequently, and keeping the joints of the track body and other tracks always corresponding and flush. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front three-dimensional structural schematic diagram of the present invention.

[0019] Figure 2 is a structural schematic diagram of the semi-circular groove and the installation groove in the present invention.

[0020] Figure 3 is a structural schematic diagram of the positioning block and the connecting rod in the present invention.

[0021] Figure 4 is a structural schematic diagram of the middle cross-section of the positioning block in the present invention.

[0022] Figure 5 is the present invention Figure 4 structural schematic diagram of the place A in.

[0023] Figure 6 is a structural schematic diagram of the buckle plate in the present invention.

[0024] Figure 7 is a structural schematic diagram of the fixing plate in the present invention.

[0025] Figure 8 is a structural schematic diagram of the installation groove in the present invention.

[0026] Figure 9 is a structural schematic diagram of the elastic block in the present invention.

[0027] Figure 10 is a structural schematic diagram of the positioning hole in the present invention.

[0028] In the figure: 1. Track body; 2. Positioning block; 3. Connecting rod; 4. Elastic block; 41. Notch; 42. Stopper; 5. Positioning hole; 6. Semi-circular groove; 7. Nozzle; 8. Installation groove; 9. Limiting block; 10. Push rod; 11. Fixing plate; 12. Wedge-shaped block; 13. Straight plate; 14. Piston plate; 15. Buckle plate; 16. Push block; 17. Movable plate; 18. Outer plate; 19. Inner plate; 20. Elastic cord; 21. Connecting plate; 22. Bayonet; 23. Limiting hole; 24. Fitting groove. DETAILED DESCRIPTION OF THE INVENTION

[0029] Please refer to Figures 1 - 10 In an embodiment of the present invention, an arc-shaped edge track includes an arc-shaped track body 1. One end of the arc-shaped track body 1 is provided with a mounting groove 8. A positioning block 2 is elastically slidably connected in the mounting groove 8. One end side wall of the positioning block 2 close to the inside of the mounting groove 8 is fixedly provided with a connecting rod 3. The connecting rod 3 slidably passes through the side wall of the arc-shaped track body 1 and extends to the inner ring side wall of the arc-shaped track body 1. The other end of the arc-shaped track body 1 away from the mounting groove 8 is provided with a positioning hole 5 slidably adapted to the positioning block 2. A limiting component is arranged in the positioning block 2, and a limiting hole 23 slidably adapted to the limiting component is arranged in the positioning hole 5. When the positioning block 2 moves towards the positioning hole 5 and is adapted, the limiting component moves towards the limiting hole 23 and is slidably adapted to the limiting hole 23.

[0030] It should be noted that: The connecting rod 3 is fixedly arranged on one side of the positioning block 2 and slidably passes through the side wall of the arc-shaped track body 1 and extends to the inner ring position of the arc-shaped track body 1. Of course, the connecting rod 3 can also be arranged on the other side of the positioning block 2 and extend to the outer ring side wall of the arc-shaped track body 1. In addition, the mounting groove 8, the positioning block 2, and the positioning hole 5 can also be applied to non-arc-shaped tracks and are respectively arranged at both ends of the track. In this way, when the arc-shaped track body 1 is connected to other tracks, the positioning block 2 corresponds to the positioning hole 5 position on other tracks, so that the arc-shaped track body 1 can be better adapted and fixed to other tracks. In actual use, when it is necessary to connect the arc-shaped track body 1 to other tracks for use, the positioning hole 5 and the positioning block 2 are placed correspondingly. Then, the connecting rod 3 is slid to make the positioning block 2 move out of the mounting groove 8 and extend into the positioning hole 5. Then, the limiting component is adapted to the limiting hole 23, so as to realize the adaptive installation of the arc-shaped track body 1 and other tracks, thereby avoiding the problem that when the arc-shaped track body 1 or other tracks are fixed subsequently, the arc-shaped track body 1 or other tracks may shift relatively, and keeping the joints of the arc-shaped track body 1 and other tracks always aligned flush.

[0031] Please refer to Figures 3 - 7 Preferably, the limiting component includes two groups of limiting blocks 9; the limiting blocks 9 are symmetrically arranged along the center of the positioning block 2, and the two groups of limiting blocks 9 are respectively elastically slidably arranged at the upper and lower ends of the positioning block 2. The limiting blocks 9 are slidably adapted to the limiting hole 23, and the limiting blocks 9 are arranged in the side wall of the positioning block 2 close to the positioning hole 5. When the positioning block 2 slides into the positioning hole 5, the two groups of limiting blocks 9 respectively correspond to the positions of the corresponding limiting holes 23. Then, the limiting blocks 9 slide out of the side wall of the positioning block 2 and extend into the limiting holes 23, so as to realize the limitation of the relative positions of the arc-shaped track body 1 and other tracks, and avoid the problem that after the arc-shaped track body 1 and the adjacent track are aligned and placed, during the subsequent fixing by bolts, the track may shift, resulting in misalignment of the final joints and affecting the subsequent use.

[0032] Further, preferably, a fixing plate 11 is fixedly arranged at the center inside the positioning block 2. One end of the fixing plate 11 close to the limiting block 9 is rotatably connected with a telescopic plate. The telescopic plates are symmetrically arranged along the center of the fixing plate 11, and the telescopic plates are arranged at the upper and lower ends of the fixing plate 11, that is, the telescopic plates correspond to the limiting block 9 one by one. One end of the telescopic plate far from the fixing plate 11 is rotatably connected with a movable plate 17. On both sides of one end of the movable plate 17 far from the telescopic plate, there are rotatably connected connecting plates 21. One side of the connecting plate 21 far from the movable plate 17 is slidably connected with the side wall of the fixing plate 11. During actual use, a groove is arranged at one end of the fixing plate 11 close to the limiting block 9. The telescopic plate, the movable plate 17 and the connecting plates 21 are all arranged in the groove. And when the connecting plate 21 is at one end of the fixing plate 11 close to the limiting block 9, the rotation connection part of the telescopic plate and the movable plate 17 is attached to the end of the limiting block 9. At this time, the limiting block 9 is retracted inside the positioning block 2, and the telescopic plate and the movable plate 17 are in a bent state relatively close to the limiting block 9. In this way, when the connecting plate 21 moves towards the telescopic plate, it can push the movable plate 17 to move towards the telescopic plate. And because the position of the telescopic plate is in a relatively fixed state, the movable plate 17 will rotate towards the limiting block 9, so that the limiting block 9 moves out of the side wall of the positioning block 2. Through the cooperation of the telescopic plate and the movable plate 17, the effect that the limiting block 9 automatically extends out of the positioning block 2 and adapts to the limiting hole 23 is achieved.

[0033] Please refer to Figure 5 Preferably, the telescopic plate includes an inner plate 19 and an outer plate 18; the inner plate 19 is rotatably connected with the side wall of the fixing plate 11, the outer plate 18 is sleeved on the periphery of the inner plate 19 far from the fixing plate 11, and one end of the outer plate 18 far from the inner plate 19 is rotatably connected with the movable plate 17. It should be noted that: the maximum rotation angle between one end of the inner plate 19 far from the outer plate 18 and the fixing plate 11 is that after the inner plate 19 rotates to the vertical state, it can no longer rotate. In this way, when the connecting plate 21 continues to move towards the inner plate 19, it will only make the movable plate 17 rotate upwards, so that the outer plate 18 moves away from the inner plate 19, thus avoiding the problem that when the inner plate 19 rotates to the vertical state, it can still continue to rotate and the movable plate 17 and the outer plate 18 cannot push the limiting block 9 to move.

[0034] Please refer to Figures 2 - 7, preferably, a straight plate 13 is slidably arranged at the center of the fixing plate 11. An elastic cord 20 is fixedly arranged between the connecting plate 21 and the straight plate 13. One end of the straight plate 13 away from the connecting plate 21 is slidably connected with a wedge-shaped block 12. A spring block 4 is arranged at one end of the installation groove 8 away from the positioning block 2. An opening 41 is arranged at one end of the spring block 4 close to the positioning block 2. A stop block 42 is fixedly arranged at the bottom of one side of the opening 41 close to the positioning block 2. During actual use, the wedge-shaped block 12 and the straight plate 13 are elastically slidably connected through a spring, and the bottom end of the wedge-shaped block 12 is provided with an inclined surface facing the spring block 4. The spring block 4 is elastically connected with the inner wall of the arc-shaped track body 1 through a spring, and one end of the spring block 4 extends to the inner ring side wall of the arc-shaped track body 1. There is a gap (denoted as an avoidance opening) between one end of the stop block 42 close to the inner ring of the arc-shaped track body 1 and the opening 41.

[0035] During use, in the initial state, the positioning block 2 is retracted in the installation groove 8. Under the action of the corresponding spring, the top of the wedge-shaped block 12 is flush with the top of the straight plate 13. Under the action of the corresponding spring, one end of the spring block 4 away from the spring is flush with the inner ring side wall of the arc-shaped track body 1. And the wedge-shaped block 12 is located in the opening 41 and is attached to the side of the stop block 42 away from the positioning block 2, so as to realize the limitation of the relative position of the straight plate 13. The corresponding connecting plate 21 is located at one end of the fixing plate 11 away from the spring block 4. When the sliding connecting rod 3 is used to move the positioning block 2 out of the installation groove 8 to be adapted to the positioning holes 5 on other tracks, during this process, since the wedge-shaped block 12 is adapted to the stop block 42, the positions of the wedge-shaped block 12 and the straight plate 13 are relatively fixed. Therefore, when the positioning block 2 moves, the straight plate 13 is in a relatively fixed position, and then the elastic cord 20 is stretched. Then, through the elastic cord 20, the connecting plate 21 moves towards the straight plate 13. The movement of the connecting plate 21 makes the movable plate 17 move towards the telescopic plate, so that the movable plate 17 and the telescopic plate rotate relatively towards the limiting block 9. When the telescopic plate cannot rotate, the movable plate 17 is used to push the limiting block 9 to move into the limiting hole 23 in the direction away from the positioning block 2, so as to complete the fixation of the arc-shaped track body 1 and other tracks. When it is necessary to release the fixation between the arc-shaped track body 1 and other tracks, the spring block 4 is pressed into the arc-shaped track body 1, so that the spring block 4 moves into the arc-shaped track body 1, and then the stop block 42 moves to separate from the wedge-shaped block 12, that is, the wedge-shaped block 12 slides relative to the spring block 4 to the position of the avoidance opening. At this time, the elastic cord 20 elastically resets and pulls the straight plate 13 to reset, and the movable plate 17 and the telescopic plate are no longer stressed. Then, the limiting block 9 moves and contracts in the positioning block 2 under the corresponding elastic action. During this process, when the limiting block 9 moves and resets, it pushes the movable plate 17 and the telescopic plate to rotate and reset, and then the connecting plate 21 moves and resets. And when the limiting block 9 separates from the limiting hole 23, the fixed limit between the arc-shaped track body 1 and other tracks is released.

[0036] Please refer to Figures 5 - 10, preferably, a bayonet 22 is provided on one side of the limit block 9. The bayonet 22 is provided on the side of the limit block 9 away from the straight plate 13. A buckle plate 15 is elastically connected to the inner side wall of the positioning block 2 through a spring. At both ends of the side of the buckle plate 15 close to the limit block 9, there are provided clamping blocks that are slidably adapted to the bayonet 22.

[0037] Furthermore, preferably, on both sides of the center of the buckle plate 15, there are slidingly fitted with push blocks 16. The push blocks 16 are slidably arranged inside the side wall of the positioning block 2. At the end side wall of the push block 16 away from the buckle plate 15, there is fixedly provided an extension rod. The extension rod is arranged on the side of the push block 16 away from the limit block 9, and at the end of the extension rod away from the push block 16, there is fixedly connected with a push rod 10. The end of the push rod 10 away from the buckle plate 15 slidably protrudes from the side wall of the positioning block 2. Inside the installation groove 8, there is provided a semi-circular groove 6 that is slidably adapted to the push rod 10 correspondingly. Inside the positioning hole 5, there is provided a mating groove 24 that is slidably engaged with the push rod 10 correspondingly.

[0038] During actual use, at the end of the clamping block away from the buckle plate 15, there is provided an inclined surface facing the periphery of the positioning block 2. On the side of the push block 16 close to the buckle plate 15, there is provided an inclined surface facing the buckle plate 15. The push rod 10 is arranged in a cylindrical structure, and the end of the push rod 10 protruding from the positioning block 2 is arranged in a semi-circular structure; in the initial state, the limit block 9 is retracted inside the side wall of the positioning block 2. At this time, the bayonet 22 is slidably engaged with the clamping block. Furthermore, through the inclined surface of the push block 16, the push rod 10 protrudes from the side wall of the positioning block 2 and is located inside the semi-circular groove 6. At the end of the mating groove 24 close to the limit hole 23, there is provided a connecting slope with the inner wall of the positioning hole 5, and the length of the mating groove 24 is the distance when the positioning block 2 extends into the positioning hole 5 and one side of the limit block 9 also extends into the positioning hole 5; when the positioning block 2 moves into the positioning hole 5, the movement of the positioning block 2 drives the push rod 10 to move and separate from the semi-circular groove 6. Subsequently, under the action of the mating groove 24, the push rod 10 moves and contracts into the positioning block 2. At this time, the movement of the push rod 10 drives the push block 16 to move towards the buckle plate 15. Furthermore, through the inclined surface of the push block 16, the buckle plate 15 moves in a direction away from the limit block 9, causing the clamping block to separate from the bayonet 22 and releasing the restriction on the limit block 9. Subsequently, when the movement of the positioning block 2 makes the limit block 9 correspond to the limit hole 23, the limit block 9 moves and extends into the limit hole 23 under the action of the movable plate 17. Through the setting of the clamping block, it is avoided that when the limit block 9 extends out of the installation groove 8 following the positioning block 2 and does not move and extend into the positioning hole 5, there will be a problem that the limit block 9 moves and protrudes from the positioning block 2, resulting in the positioning block 2 being unable to move into the positioning hole 5 anymore.

[0039] Please refer to Figures 1 - 2 、 Figure 4, preferably, a storage cavity is arranged inside the end of the positioning block 2, the storage cavity is arranged at the position corresponding to the push rod 10, a piston plate 14 is arranged in the storage cavity in a centrally symmetrically sealed and sliding manner, one side of the piston plate 14 close to the push rod 10 is fixedly connected to the push rod 10, a spray head 7 communicating with the storage cavity is arranged at one end of the positioning block 2 far away from the connecting rod 3. During actual use, a lubricating liquid for lubricating between the positioning block 2 and the positioning hole 5 can be injected into the storage cavity, and the spray head 7 can be arranged according to the actual required position. After the end of the positioning block 2 extends into the positioning hole 5 and the push rod 10 contracts into the positioning block 2 under the action of the fitting groove 24, when the push rod 10 moves, it will push the piston plate 14 closer, thereby causing the lubricating liquid in the storage cavity between the piston plates 14 to be squeezed, and then sprayed out through the spray head 7, so that the positioning hole 5 is lubricated. In this way, when the positioning block 2 extends into the positioning hole 5, there will be no large friction, reducing the wear of the positioning hole 5 or the positioning block 2, keeping the positioning hole 5 and the positioning block 2 always in close sliding fit, and improving the accuracy at the arc-shaped track body 1 and other track joints.

Claims

1. An arc-shaped edge track, comprising an arc-shaped track body; characterized in that, One end of the arc-shaped track body is provided with an installation groove, a positioning block is slidably connected in the installation groove, a connecting rod is fixedly arranged on the side wall of one end of the positioning block close to the inside of the installation groove, a positioning hole slidably adapted to the positioning block is arranged at the other end of the arc-shaped track body far from the installation groove, a limiting component is arranged in the positioning block, and a limiting hole slidably adapted to the limiting component is arranged in the positioning hole; When the positioning block moves towards the positioning hole, the limiting component moves towards the limiting hole; The limiting component comprises two groups of limiting blocks; the limiting blocks are symmetrically arranged along the center of the positioning block, and the two groups of limiting blocks are respectively slidably arranged at the upper and lower ends of the positioning block, the limiting blocks are slidably adapted to the limiting holes, and the limiting blocks are arranged in the side wall of the positioning block close to the positioning hole; A fixed plate is fixedly arranged at the center of the positioning block, a telescopic plate is rotatably connected to one end of the fixed plate close to the limiting block, the telescopic plates are symmetrically arranged along the center of the fixed plate, and the telescopic plates are arranged at the upper and lower ends of the fixed plate, a movable plate is rotatably connected to one end of the telescopic plate far from the fixed plate, connecting plates are rotatably connected to both sides of one end of the movable plate far from the telescopic plate, and the side of the connecting plate far from the movable plate is slidably connected to the side wall of the fixed plate; The telescopic plate comprises an inner plate and an outer plate; the inner plate is rotatably connected to the side wall of the fixed plate, the outer plate is sleeved on the periphery of the inner plate far from the fixed plate, and one end of the outer plate far from the inner plate is rotatably connected to the movable plate; A straight plate is slidably arranged at the center of the fixed plate, an elastic cord is fixedly arranged between the connecting plate and the straight plate, and a wedge-shaped block is slidably connected to one end of the straight plate far from the connecting plate; A spring block is arranged at one end of the installation groove far from the positioning block, a notch is arranged at one end of the spring block close to the positioning block, and a stop block is fixedly arranged at the bottom of one side of the notch close to the positioning block; 2. The arc-shaped edge track according to claim 1, wherein, A bayonet is arranged on one side of the limiting block, the bayonet is arranged on the side of the limiting block far from the straight plate, a clamping plate is elastically connected in the side wall of the positioning block, and clamping blocks slidably adapted to the bayonet are arranged at both ends of one side of the clamping plate close to the limiting block; 3. An arc-shaped edge track according to claim 2, characterized in that, Push blocks are slidably attached to both sides of the center of the clamping plate, the push blocks are slidably arranged in the side wall of the positioning block, an extension rod is fixedly arranged on the side wall of one end of the push block far from the clamping plate, the extension rod is arranged on the side of the push block far from the limiting block, and a push rod is fixedly connected to one end of the extension rod far from the push block; 4. An arc-shaped edge track according to claim 3, characterized in that, One end of the push rod far from the clamping plate slides out of the side wall of the positioning block, a semi-circular groove slidably adapted to the push rod is arranged in the installation groove, and a mating groove slidably cooperating with the push rod is arranged in the positioning hole; 5. An arc-shaped edge track according to claim 3, characterized in that, A storage cavity is arranged inside the end of the positioning block, the storage cavity is arranged at a position corresponding to the push rod, a piston plate is symmetrically and hermetically slidably arranged in the storage cavity along the center, one side of the piston plate close to the push rod is fixedly connected to the push rod, and a nozzle communicated with the storage cavity is arranged at one end of the positioning block far from the connecting rod.

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