Crankshaft timing measuring tool and use method thereof

Abstract

The present invention discloses a crankshaft timing measuring tool and its use method. The measuring tool includes a frame, a gear seat, a bracket, a fixed thimble, a movable thimble, and a spring. The gear seat, bracket, fixed thimble, and movable thimble are mounted on the frame. The movable thimble is provided with a collar I, and a spring is sleeved on the movable thimble. One end of the spring contacts the frame, and the other end contacts the end face of collar I. The gear seat is disposed between the fixed thimble and the movable thimble. A gear shaft is supported on the gear seat via a bearing. The gear shaft is perpendicular to the fixed thimble. A collar II is disposed on the gear shaft. A driving gear meshes with a gear of the crankshaft. A handwheel is fixedly mounted on the end of the gear shaft. The bracket is mounted on the outside of the gear seat. The bracket is provided with a rod hole. A gear rod is disposed in the rod hole. The gear rod is clearance-matched with the rod hole. A second gear is disposed at the lower end of the gear rod, which can mesh with a gear on the crank. The present invention has a simple structure and low cost. The use method of the present invention is simple to operate and provides accurate measurement.

Description

Technical Field

[0001] The invention belongs to the technical field of crankshaft timing measurement tooling, and particularly relates to a measuring tool for measuring the timing position of a crankshaft gear and a method of using the tool. Background Art

[0002] Engine timing is the optimal timing for exhaust, fuel injection, and ignition. Therefore, the camshaft and crankshaft timing gears connected by belts or chains on the engine must be marked with timing marks to ensure alignment with the cylinder markings or chain markings on the cylinder head and cylinder during installation. The timing position of the crankshaft timing gear on certain micro-aircraft engines corresponds to the highest point of the crankshaft crank. Therefore, before installation, the highest point of the crankshaft crank must be accurately measured to determine the gear timing position and mark it. To address these issues, a crankshaft timing gauge and its use method have been developed to accurately determine the timing position of the crankshaft gear. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a crankshaft timing measuring tool and operating method with simple structure and easy operation, which can determine the timing position of the timing gear by measuring the highest point of the crankshaft crank and ensure the correctness of installation with other parts.

[0004] The technical solution adopted by the present invention is: a crankshaft timing measuring tool, including a frame, a gear seat, a bracket, a fixed thimble, a movable thimble and a spring; the gear seat, the bracket, the fixed thimble and the movable thimble are installed on the frame, and the fixed thimble and the movable thimble are coaxially arranged; the movable thimble is provided with a collar I, and the movable thimble is sleeved with a spring, one end of the spring contacts the frame, and the other end contacts the end face of the collar I, and the spring provides clamping force; the gear seat is arranged between the fixed thimble and the movable thimble, and ... A gear shaft is supported on the wheel seat by a bearing, the gear shaft is perpendicular to the fixed thimble, a shaft ring II is provided on the gear shaft, a driving gear meshing with the gear of the crankshaft is provided on the shaft ring II, and a hand wheel is fixedly installed on the end of the gear shaft; the bracket is installed on the outside of the gear seat, the bracket is L-shaped, the bottom of the vertical beam of the bracket is installed on the frame, the horizontal beam of the bracket is provided with a rod hole, a gear rod is provided in the rod hole, the gear rod and the rod hole are clearance-matched, and the gear rod is vertically arranged; the lower end of the gear rod is provided with a second gear meshing with the gear on the crank.

[0005] Furthermore, the frame includes a base plate, a fixed ejector seat and a movable ejector seat; the fixed ejector seat and the movable ejector seat are respectively installed at both ends of the base plate, the fixed ejector seat is provided with a fixed ejector hole, the fixed ejector hole is a stepped hole, the outer end diameter of the fixed ejector hole is larger than the inner end diameter; a fixed ejector is provided in the fixed ejector hole, and the fixed ejector is limited by providing an ejector cover plate at the outer end of the fixed ejector hole;

[0006] A movable ejector hole is provided on the movable ejector seat, which is a stepped hole, and the outer diameter of the movable ejector hole is larger than the inner diameter; a movable ejector cover is fixedly installed at the outer end of the movable ejector hole; a movable ejector is provided in the movable ejector hole; the inner end of the movable ejector passes through the inner end of the movable ejector hole, the shaft collar I of the movable ejector is placed outside the movable ejector hole, and the outer end of the movable ejector passes through the movable ejector cover; one end of the spring contacts the movable ejector cover, and the other end of the spring contacts the end face of the shaft collar I facing the movable ejector cover.

[0007] Furthermore, a handle is fixedly installed on the outer end of the movable ejector.

[0008] Furthermore, an insert hole is provided on the crossbeam of the bracket, and an insert is provided in the insert hole; a rod hole is provided at the insert on the bracket, and the diameter of the rod hole passes through the center of the insert hole.

[0009] Furthermore, the cross-section of the gear seat is U-shaped, and a bearing hole is respectively provided on the two side panels of the gear seat. The two bearing holes are coaxial, and a bearing is respectively provided in each bearing hole. The end surfaces opposite to each other of the two bearing holes are respectively provided with end covers and flanges, and the flanges are installed on the side panels farther away from the bracket; the gear shaft is supported on the two bearings; one end of the gear shaft extends out of the flange and is connected to the handwheel.

[0010] Furthermore, two spacers are sleeved on the gear shaft; the two spacers are respectively located between the two bearings and the shaft ring II, and are used to limit the axial position of the gear shaft.

[0011] A method for using the crankshaft timing measuring tool is as follows:

[0012] 1) Pull the movable ejector pin away from the fixed ejector pin, place the crankshaft between the fixed ejector pin and the movable ejector pin, so that the left end of the crankshaft presses against the fixed ejector pin; and make the crankshaft gear mesh with the driving gear of the gear shaft. Release the movable ejector pin, and the movable ejector pin will return to its original position and press against the crankshaft under the action of the spring.

[0013] 2) Place the dial gauge probe on the crank of the crankshaft to rotate the gear shaft, thereby driving the crankshaft to rotate; find the highest point of the crank by reading the standard dial gauge;

[0014] 3) Insert the gear pair rod into the tooth groove of the gear on the crankshaft. The position corresponding to the gear pair rod is the timing position of the crankshaft gear. After marking, remove the product.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The crankshaft timing measuring tool of the present invention has a simple structure and low cost. When using the present invention, the probe of the micrometer is placed on the crank of the crankshaft, and the hand wheel is turned to rotate the gear shaft, thereby driving the crankshaft to rotate; the highest point of the crank is found by reading the standard micrometer, and the gear pair rod is inserted into the tooth groove of the gear on the crankshaft. The timing position of the crankshaft gear corresponds to the gear pair rod. After marking, the product is removed; the operation is simple and the measurement is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the crankshaft timing measuring tool of the present invention.

[0018] Figure 2 It is a left side view of the crankshaft timing measuring tool of the present invention.

[0019] Figure 3 It is a top view of the crankshaft timing measuring tool of the present invention.

[0020] Figure 4 It is a three-dimensional diagram of the crankshaft timing measuring tool of the present invention.

[0021] Figure 5 It is a structural diagram of the crankshaft used for detection according to the present invention.

[0022] Figure 6 It is a front view of the gear-pair rod of the crankshaft timing measuring tool of the present invention.

[0023] Figure 7 The present invention is a bottom view of the gear pair of the crankshaft timing measuring tool.

[0024] Figure 8 It is a three-dimensional view of the movable ejector cover plate of the crankshaft timing measuring tool of the present invention.

[0025] Figure 9 It is a structural diagram of the gear shaft of the crankshaft timing measuring tool of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1-9 As shown, the crankshaft timing measuring tool of the present invention includes a frame, a gear seat 16, a bracket 25, a fixed ejector pin 2, a movable ejector pin 10 and a spring 8.

[0028] The frame includes a base plate 17, a fixed ejector seat 3, and a movable ejector seat 14. The fixed ejector seat 3 and movable ejector seat 4 are mounted at opposite ends of the base plate 17 via screws 15. The fixed ejector seat 3 is provided with a stepped fixed ejector hole, with the outer diameter of the hole larger than the inner diameter. A fixed ejector pin 2 is positioned within the hole, and an ejector cover plate 1 is provided at the outer end of the hole to limit the position of the fixed ejector pin. The ejector cover plate 1 is mounted to the fixed ejector seat 3 using screws 18.

[0029] A movable thimble hole is provided on the movable thimble seat 14. The movable thimble hole is a stepped hole, and the outer diameter of the movable thimble hole is larger than the inner diameter. A movable thimble cover plate 9 is fixedly installed at the outer end of the movable thimble hole. A movable thimble 10 is provided in the movable thimble hole; the inner end of the movable thimble 10 passes through the inner end of the movable thimble hole, and the movable thimble 10 is provided with a collar I, which is placed outside the movable thimble hole, and the outer end of the movable thimble 10 passes through the movable thimble cover plate; the outer end of the movable thimble 10 is connected to a handle 11 via a pin shaft 12. One end of the spring 8 contacts the movable thimble cover plate 9, and the other end of the spring 8 contacts the end face of the collar I facing the movable thimble cover plate, and the spring 8 provides clamping force. The fixed thimble and the movable thimble are coaxially arranged. A guide portion 91 is provided on the outer end surface of the movable ejector cover 9, and a guide slot 92 is provided on the guide portion 91. The movable ejector 10 is provided with a guide pin 13, which is perpendicular to the movable ejector 10. The portion of the guide pin 13 extending out of the movable ejector 10 is embedded in the guide slot 92.

[0030] The gear seat 16 is mounted on the base plate 17 of the frame via screws 15 and pins. The gear seat 16 is positioned between the fixed ejector pin 2 and the movable ejector pin 10. A gear shaft 23 is supported on the gear seat 16 via a bearing. The gear shaft 23 is perpendicular to the fixed ejector pin 10, and a handwheel 28 is fixedly mounted on the end of the gear shaft 23. The cross-section of the gear seat 16 is U-shaped, with a bearing hole provided on each of the two side panels. The two coaxial bearing holes contain a bearing in each. End caps 21 and flanges 26 are fixed to the opposing end faces of the two bearing holes via screws. The flanges 26 are mounted on the side panels farther from the bracket 25. The gear shaft 23 is supported on two bearings 22; one end of the gear shaft 23 extends beyond the flange 26 and is connected to the handwheel. The gear shaft 23 is connected to the handwheel 28 via a key and is locked with a set screw 29. The gear shaft 23 is provided with a collar II, which is covered with two spacers 24. The collar II is provided with a driving gear 231 that meshes with the gear 41 of the crankshaft 4. The two spacers are respectively located between the two bearings 22 and the collar II to limit the axial position of the gear shaft 23.

[0031] The bracket 25 is fixedly mounted on the outside of the gear seat 16 by screws 20 and positioned by a pin 19. The bracket 25 is L-shaped, and the bottom of the vertical beam of the bracket 25 is mounted on the bottom plate 17 of the frame. The cross beam of the bracket 25 is provided with an insert hole, and an insert 5 is provided in the insert hole. A counter-rod hole is provided at the insert on the bracket 25, and the diameter of the counter-rod hole passes through the center of the insert hole. The gear counter-rod 6 is clearance-matched with the counter-rod hole, and the gear counter-rod 6 is vertically arranged. The gear counter-rod 6 can slide slowly up and down in the bracket insert 5. The lower end of the gear counter-rod 6 is processed with a second gear 61 corresponding to the gear 41 of the crankshaft 4, and the second gear 61 at the lower end of the gear counter-rod 6 can mesh with the gear 41.

[0032] The method for using the crankshaft timing measuring tool of the present invention is as follows:

[0033] 1) Pull handle 11 to the right, moving movable ejector 10 to the right (away from fixed ejector 12). Place crankshaft 4 between fixed ejector 2 and movable ejector 10, so that the left end of crankshaft 4 presses against fixed ejector 2. Engage gear 41 of crankshaft 4 with driving gear 231 of gear shaft 23. Release handle 11, and movable ejector 10, acting on spring 8, returns to press against the right end of crankshaft 4.

[0034] 2) Place the probe of a universal standard micrometer on the crank 42 of the crankshaft 4, and slowly turn the handwheel 28 to rotate the gear shaft 23, thereby driving the crankshaft 4 to rotate.

[0035] 3) Find the highest point of the crank by reading the standard dial indicator, insert the gear pair rod 6 into the gear of the crankshaft 4, and the timing position of the gear of the crankshaft 4 corresponding to the gear pair rod 6 is the timing position of the gear of the crankshaft 4. After marking, lift the gear pair rod 6, pull the handle 11 to the right, remove the product, and complete the measurement.

Claims

1. A crankshaft timing measuring tool, characterized by: It includes a frame, a gear seat, a bracket, a fixed thimble, a movable thimble and a spring; the gear seat, the bracket, the fixed thimble and the movable thimble are installed on the frame, and the fixed thimble and the movable thimble are coaxially arranged; the movable thimble is provided with a collar I, and a spring is sleeved on the movable thimble, one end of the spring is in contact with the frame, and the other end is in contact with the end face of the collar I, and the spring provides clamping force; the gear seat is arranged between the fixed thimble and the movable thimble, and the gear shaft is supported by a bearing on the gear seat, and the gear shaft is perpendicular to the fixed thimble, and a collar II is provided on the gear shaft, and a driving gear meshing with the gear of the crankshaft is provided on the collar II, and a handwheel is fixedly installed on the end of the gear shaft; the bracket is installed on the outside of the gear seat, the bracket is L-shaped, and the bottom of the vertical beam of the bracket is installed on the frame, and the crossbeam of the bracket is provided with a rod hole, and a gear rod is provided in the rod hole, and the gear rod is clearance-matched with the rod hole, and the gear rod is vertically arranged; the lower end of the gear rod is provided with a second gear that can mesh with the gear on the crank; The frame includes a base plate, a fixed ejector seat and a movable ejector seat; the fixed ejector seat and the movable ejector seat are respectively installed at both ends of the base plate, the fixed ejector seat is provided with a fixed ejector hole, the fixed ejector hole is a stepped hole, the outer end diameter of the fixed ejector hole is larger than the inner end diameter; a fixed ejector is provided in the fixed ejector hole, and an ejector cover is provided at the outer end of the fixed ejector hole to limit the fixed ejector; A movable ejector hole is provided on the movable ejector seat, and the movable ejector hole is a stepped hole, and the outer diameter of the movable ejector hole is larger than the inner diameter; a movable ejector cover is fixedly installed at the outer end of the movable ejector hole; a movable ejector is provided in the movable ejector hole; the inner end of the movable ejector passes through the inner end of the movable ejector hole, the shaft collar I of the movable ejector is placed outside the movable ejector hole, and the outer end of the movable ejector passes through the movable ejector cover; one end of the spring contacts the movable ejector cover, and the other end of the spring contacts the end surface of the shaft collar I facing the movable ejector cover; The cross-section of the gear seat is U-shaped, and a bearing hole is provided on each side plate of the gear seat. The two bearing holes are coaxial, and a bearing is provided in each bearing hole. End covers and flanges are provided on the opposite end faces of the two bearing holes, and the flanges are installed on the side plate farther away from the bracket; the gear shaft is supported on the two bearings; one end of the gear shaft extends out of the flange and is connected to the handwheel.

2. The crankshaft timing measuring tool according to claim 1, characterized in that: A handle is fixedly installed on the outer end of the movable ejector.

3. The crankshaft timing measuring tool according to claim 1, characterized in that: The crossbeam of the bracket is provided with an insert hole, in which an insert is arranged; a rod hole is provided at the insert on the bracket, and the diameter of the rod hole passes through the center of the insert hole.

4. The crankshaft timing measuring tool according to claim 1, characterized in that: There are two spacers on the gear shaft; the two spacers are respectively located between the two bearings and the shaft ring II and are used to limit the axial position of the gear shaft.

5. A method for using the crankshaft timing measuring tool according to any one of claims 1 to 4, comprising the following steps: 1) Pull the movable ejector pin away from the fixed ejector pin, place the crankshaft between the fixed ejector pin and the movable ejector pin, so that the left end of the crankshaft presses against the fixed ejector pin; and make the crankshaft gear mesh with the driving gear of the gear shaft. Release the movable ejector pin, and the movable ejector pin will return to its original position and press against the crankshaft under the action of the spring. 2) Place the dial gauge probe on the crank of the crankshaft to rotate the gear shaft, thereby driving the crankshaft to rotate; find the highest point of the crank by reading the standard dial gauge; 3) Insert the gear pair rod into the tooth groove of the gear on the crankshaft. The position corresponding to the gear pair rod is the timing position of the crankshaft gear. After marking, remove the product.

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