A digital crankshaft measuring instrument

Abstract

This utility model relates to a digital crankshaft measuring instrument that solves the problems of small measurement range, inaccurate measurement, and inconvenient use of existing crankshaft measuring instruments. It includes a digital display indicator, a positioning probe, a movable probe, a mounting base, and a slider. The mounting base has a transverse through hole and a longitudinal hole. The slider slides within the transverse through hole, and the movable probe is fixed to the slider. In use, the positioning probe and the movable probe are respectively engaged on both sides of the groove or hole to be measured. Moving to the measurement location, the movable probe drives the slider to move. The inclined groove on the slider pushes the connecting rod to move, and the connecting rod pushes the measuring rod of the digital display indicator to move, thereby displaying the measurement data. By separating the positioning probe and the movable probe from the digital display indicator, and through the structural design of the slider and connecting rod, smaller dimensions can be measured. The crankshaft measuring instrument is not limited by space and can withstand greater measuring forces, resulting in high measurement accuracy and good stability. It is also simple to operate and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of measurement, specifically to a digital crankshaft measuring instrument. Background Technology

[0002] In engine manufacturing, the crankshaft is a core component. Due to its large size and weight, complex structure, and non-removable nature, precise measurement of its deformation is crucial. The crankshaft has numerous mounting slots. After machining the bottom of these slots, it's necessary to measure and assess whether the crankshaft has deformed. Traditional crankshaft measurement tools, such as... Figure 1 As shown, traditional crankshaft gauges are limited by space constraints, which restricts the measuring force. Applying excessive force can deform the gauge, leading to inaccurate measurements. Furthermore, traditional crankshaft gauges are structurally limited, restricting their measuring range and preventing the measurement of smaller clearance dimensions. Utility Model Content

[0003] The purpose of this invention is to solve the problems of existing crankshaft measuring instruments having a small measuring range, inaccurate measurements, and inconvenience of use.

[0004] The technical solution adopted to solve the technical problem proposed by this utility model is as follows: The digital crankshaft measuring instrument of this utility model includes a digital display indicator, a positioning probe, and a movable probe. The movable probe and the positioning probe are arranged opposite to each other. The measuring instrument also includes a mounting base and a slider. The mounting base has a transverse through hole and a longitudinal hole that is perpendicularly connected to the transverse through hole. The transverse through hole is located at the bottom of the longitudinal hole. The positioning probe is fixed on one side of the transverse through hole. The slider is slidably disposed in the transverse through hole. The movable probe is fixed on the slider. The movable probe and the positioning probe protrude from both sides of the mounting base. A movable probe reset component is provided between the slider and the fixed probe. The digital display indicator is located at the top of the longitudinal hole. A connecting rod is provided at the bottom of the measuring rod of the digital display indicator. The connecting rod is slidably disposed in the longitudinal hole. The slider has an inclined groove corresponding to the bottom of the connecting rod for pushing the measuring rod upward. The bottom of the measuring rod is located in the inclined groove. A connecting rod reset component for resetting the connecting rod is provided in the longitudinal hole.

[0005] The technical solutions that further define this utility model include: The top of the longitudinal hole is provided with an indicator chuck, and the top of the indicator chuck is provided with a first elastic jaw. The first elastic jaw is composed of elastic jaw units evenly arranged with the center of the indicator chuck as the center. The first elastic jaw is covered with a first locking nut. The inner wall of the first locking nut is provided with a first internal thread. The outer periphery of the first elastic jaw is provided with a first external thread that mates with the first internal thread.

[0006] The bottom of the indicator chuck is provided with a second external thread, and the longitudinal hole is provided with a second internal thread that mates with the second external thread.

[0007] The connecting rod reset component is a connecting rod reset spring. The connecting rod is provided with a connecting rod reset spring stop block. The top end of the connecting rod reset spring is fixed in the longitudinal hole, and the bottom end of the connecting rod reset spring abuts against the connecting rod reset spring stop block.

[0008] The sidewall of the transverse through hole is provided with a limiting block, and the slider is provided with a limiting groove that cooperates with the limiting block.

[0009] A positioning probe fixing component is fixedly installed inside the transverse through hole. The positioning probe fixing component is sleeve-shaped. The slider is slidably installed inside the positioning probe fixing component. The positioning probe fixing component has an opening corresponding to the longitudinal hole. The movable probe reset component is located inside the positioning probe fixing component. The positioning probe fixing component has a second elastic claw for clamping the positioning probe corresponding to the positioning probe. A second locking nut is sleeved on the second elastic claw. A third internal thread is provided on the inner wall of the second locking nut. A third external thread is provided on the outer periphery of the second elastic claw to cooperate with the third internal thread.

[0010] The movable probe reset component is a movable probe reset spring. One end of the movable probe reset spring is located at the bottom of the sleeve of the positioning probe fixing component, and the other end abuts against the slider.

[0011] The mounting base is provided with a counterweight at its bottom, and the counterweight is rotatably connected to the mounting base.

[0012] The mounting base has counterweight mounting plates at both ends, which are rotatably connected to the mounting base. The two ends of the counterweight are fixedly connected to the corresponding counterweight mounting plates. The counterweight has a counterweight positioning member protruding from the middle of the counterweight. The counterweight positioning member is movably disposed inside the counterweight through an elastic member, and the top of the counterweight positioning member abuts against the mounting base.

[0013] A connecting rod positioning bushing is fixedly installed inside the longitudinal hole, and the connecting rod positioning bushing has a connecting rod positioning hole that slides with the connecting rod.

[0014] The beneficial effects of this utility model through the above technical solution are as follows: When using the digital crankshaft measuring instrument of this utility model, the positioning probe and the movable probe are respectively locked on both sides of the groove or hole to be measured. When moved to the part to be measured, the movable probe drives the slider to move, the inclined groove on the slider pushes the connecting rod to move, and the connecting rod pushes the measuring rod of the digital display indicator to move, thereby displaying the measurement data. The positioning probe and the movable probe are set separately from the digital display indicator. In addition, through the structural setting of the slider and the connecting rod, smaller sizes can be measured. The crankshaft measuring instrument is not limited by space and can withstand greater measuring force, thus achieving high measurement accuracy and good stability. At the same time, it is simple to operate and convenient to use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the digital display indicator in the background technology of the digital display crankshaft measuring instrument of this utility model.

[0016] Figure 2 This is a three-dimensional structural diagram of a digital crankshaft measuring instrument according to the present invention.

[0017] Figure 3 This is a cross-sectional structural diagram of a digital crankshaft measuring instrument according to the present invention.

[0018] Figure 4 This is an exploded structural diagram of a digital crankshaft measuring instrument according to the present invention.

[0019] In the figure, the components are: digital display indicator 10, positioning probe 20, movable probe 30, movable probe reset component 31, mounting base 40, transverse through hole 41, longitudinal hole 42, second internal thread 421, indicator chuck 43, first elastic gripper 431, first external thread 4311, second external thread 432, first locking nut 44, positioning probe fixing component 45, opening 451, second elastic gripper 452, third external thread 4521, connecting rod positioning bushing 46, and connecting rod positioning hole 4. 61, Second locking nut 47, Third internal thread 471, Positioning probe fixing screw 48, Slider 50, Inclined groove 51, Limiting groove 52, Connecting rod 60, Connecting rod reset component 61, Connecting rod reset spring stop 62, Limiting block 70, Counterweight 80, Counterweight mounting plate 81, First round hole 811, Second round hole 812, Third round hole 813, Counterweight positioning component 82, Elastic component 83, Positioning component positioning screw 84, Counterweight mounting screw 85, Pin 86. Detailed Implementation

[0020] The structure of this utility model will be further described below with reference to the accompanying drawings.

[0021] Reference Figures 1 to 4The digital crankshaft measuring instrument of this utility model includes a digital display indicator 10, a positioning probe 20, and a movable probe 30. The movable probe 30 is arranged opposite to the positioning probe 20. The measuring instrument also includes a mounting base 40 and a slider 50. The mounting base 40 has a transverse through hole 41 and a longitudinal hole 42 that is perpendicularly connected to the transverse through hole 41. The positioning probe 20 is fixed to one side of the transverse through hole 41, and the slider 50 is slidably disposed in the transverse through hole 41. The movable probe 30 is fixed on the slider 50. The movable probe 30 and the positioning probe 20 protrude from both sides of the mounting base 40, respectively. During measurement, the positioning probe and the movable probe respectively abut against... On both sides of the hole or slot for receiving measurement, a movable probe reset component 31 is provided between the slider 50 and the fixed probe. The digital display indicator 10 is located at the top of the longitudinal hole 42. In this embodiment, an indicator chuck 43 is provided at the top of the longitudinal hole 42, and a first elastic claw 431 is provided at the top of the indicator chuck 43. The first elastic claw is composed of elastic claw units evenly arranged with the center of the indicator chuck as the center. A first locking nut 44 is sleeved on the first elastic claw 431. A first internal thread is provided on the inner wall of the first locking nut 44, and a first external thread 4311 that mates with the first internal thread is provided on the outer periphery of the first elastic claw 431. By adjusting the first locking nut, the tightness of the first elastic claw is adjusted, thereby installing and positioning the digital display indicator. In this embodiment, a second external thread 432 is provided at the bottom of the indicator chuck 43, and a second internal thread 421 that mates with the second external thread 432 is provided in the longitudinal hole 42. The indicator chuck and the longitudinal hole are detachably connected, thereby facilitating assembly.

[0022] The measuring rod of the digital display indicator 10 has a connecting rod 60 at its bottom. The connecting rod 60 slides up and down within the longitudinal hole 42. A groove 51 corresponding to the bottom of the connecting rod 60 on the slider 50 is provided for pushing the measuring rod upwards. The bottom of the measuring rod is located within the groove 51. A connecting rod reset member 61 for resetting the connecting rod 60 is provided within the longitudinal hole 42. In this embodiment, the connecting rod reset member 61 is a connecting rod reset spring. A connecting rod reset spring stop 62 is provided on the connecting rod 60. The top end of the connecting rod reset spring is fixed within the longitudinal hole 42, and the bottom end of the connecting rod reset spring abuts against the connecting rod reset spring stop 62. During measurement, the movable probe is compressed, pushing the slider to move. The groove on the slider pushes the connecting rod upwards, compressing the connecting rod reset spring. When the external force on the movable probe is removed, the connecting rod reset spring is used to reset the connecting rod. A connecting rod positioning bushing 46 is fixedly provided within the longitudinal hole 42. The connecting rod positioning bushing 46 has a connecting rod positioning hole 461 that slides with the connecting rod. The connecting rod is slidably positioned in the connecting rod positioning hole, ensuring stable sliding of the connecting rod while reducing contact friction between the connecting rod and the mounting base, making the connecting rod slide more smoothly. In this embodiment, the top end of the connecting rod return spring abuts against the bottom end of the indicator clamp for positioning. In specific implementations, the top end of the connecting rod return spring can also be fixed in the longitudinal hole by other means. In this embodiment, a limiting block 70 is provided on the side wall of the transverse through hole 41, and a limiting groove 52 that mates with the limiting block 70 is provided on the slider 50. The limiting block can be fixedly installed on the mounting base by the limiting block positioning screw, and the limiting block is used to limit the sliding stroke of the slider to prevent excessive stroke from damaging or deforming the connecting rod return spring.

[0023] In this embodiment, a positioning probe fixing component 45 is fixedly installed inside the transverse through hole. The positioning probe fixing component 45 is sleeve-shaped and is fixedly connected to the mounting base by a positioning probe fixing screw 48. The slider 50 is slidably disposed inside the positioning probe fixing component 45. The positioning probe fixing component 45 has an opening 451 corresponding to the longitudinal hole 42. The movable probe reset component 31 is located inside the positioning probe fixing component 45. The positioning probe fixing component 45 has a second elastic gripper 452 for holding the positioning probe 20. A second locking nut 47 is sleeved on the second elastic gripper. A third internal thread 471 is provided on the inner wall of the second locking nut 47. A third external thread 4521 that mates with the third internal thread is provided on the outer periphery of the second elastic gripper 452. During installation, the slider, positioning probe, and movable probe are all installed with the positioning probe fixing component, and then the positioning probe fixing component is installed with the mounting base, thus facilitating overall assembly. The positioning probe is disassembled and installed via the second elastic gripper housing, allowing for the replacement of positioning probes of different lengths, making it convenient to select the appropriate length of positioning probe according to the different sizes of the products to be tested.

[0024] In this embodiment, the movable probe reset component 31 is a movable probe reset spring. One end of the movable probe reset spring is located at the bottom of the sleeve of the positioning probe fixing component 45, and the other end abuts against the slider 50. During measurement, when an external force presses down on the movable probe, the movable probe drives the slider to slide. The inclined groove on the slider pushes the connecting rod upward, compressing the movable probe reset spring. When the external force is removed, the movable probe reset spring rebounds, causing the connecting rod to reset.

[0025] In this embodiment, a counterweight 80 is provided at the bottom of the mounting base 40. The counterweight 80 is rotatably connected to the mounting base 40. Counterweight mounting plates 81 are provided at both ends of the mounting base 40, and the counterweight mounting plates 81 are rotatably connected to the mounting base 40. The two ends of the counterweight 80 are fixedly connected to the corresponding counterweight mounting plates 81. Mounting cylinders are provided at both ends of the mounting base. One end of the counterweight mounting plate 81 is provided with a first circular hole 811 rotatably connected to the mounting cylinder. The other end of the counterweight mounting plate 81 is provided with a second circular hole 812 and a third circular hole 813. The counterweight is fixedly connected to the counterweight mounting plate by a counterweight mounting screw 85 passing through the second circular hole and a pin 86 passing through the third circular hole 813. A counterweight positioning member 82 protruding from the counterweight 80 is provided in the middle of the counterweight 80. The counterweight positioning member 82 is movably disposed in the counterweight 80 by an elastic member 83. The top of the counterweight positioning member 82 abuts against the mounting base 40. The elastic element can be a compression spring. The counterweight has a positioning hole for a positioning element, which slides within the hole. The positioning element is movably positioned within the hole by a positioning screw 84 that passes through the positioning element and is fixed to the bottom of the positioning hole. The compression spring is sleeved on the screw, with one end inside the positioning hole and the other end abutting against the positioning element. During measurement, the counterweight can rotate relative to the mounting base, thus lowering the center of gravity of the entire measuring instrument. Because the measuring force is relatively large and the probe is very sharp, it will not move on its own after contacting the two shoulders. After installing the measuring instrument, the operator still has other tasks to perform, such as rotating the crankshaft at an angle. It would be convenient if the measuring instrument could automatically rotate to an angle suitable for measurement. The counterweight provides a vertically downward force to maintain this angle, thus facilitating use.

[0026] When using the digital crankshaft measuring instrument of this invention, the positioning probe 20 and the movable probe 30 are respectively engaged on both sides of the groove or hole to be measured. Moving to the part to be measured, the movable probe 30 drives the slider 50 to move. The inclined groove 51 on the slider 50 pushes the connecting rod 60 to move, and the connecting rod 60 pushes the measuring rod of the digital display indicator 10 to move, thereby displaying the measurement data. The positioning probe 20 and the movable probe 30 are separated from the digital display indicator 10. Furthermore, through the structural arrangement of the slider 50 and the connecting rod 60, the measured size is not limited by the size of the digital display indicator, thus enabling the measurement of smaller dimensions. The crankshaft measuring instrument is not limited by space and can withstand greater measuring forces, resulting in high measurement accuracy and good stability. It is also simple to operate and convenient to use.

[0027] Although specific embodiments of the present invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of the present invention. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of the present invention.

Claims

1. A digital crankshaft measuring instrument, comprising a digital display indicator, a positioning probe, and a movable probe, wherein the movable probe and the positioning probe are arranged opposite to each other, characterized in that: The measuring instrument also includes a mounting base and a slider. The mounting base has a transverse through hole and a longitudinal hole perpendicularly connected to the transverse through hole. The transverse through hole is located at the bottom of the longitudinal hole. The positioning probe is fixed to one side of the transverse through hole. The slider is slidably disposed within the transverse through hole. The movable probe is fixed on the slider. The movable probe and the positioning probe protrude from both sides of the mounting base. A movable probe reset component is provided between the slider and the fixed probe. The digital display indicator is located at the top of the longitudinal hole. A connecting rod is provided at the bottom of the measuring rod of the digital display indicator. The connecting rod slides up and down within the longitudinal hole. The slider has an inclined groove corresponding to the bottom of the connecting rod for pushing the measuring rod upward. The bottom of the measuring rod is located within the inclined groove. A connecting rod reset component for resetting the connecting rod is provided within the longitudinal hole.

2. The digital crankshaft measuring instrument as described in claim 1, characterized in that: The top of the longitudinal hole is provided with an indicator chuck, and the top of the indicator chuck is provided with a first elastic jaw. The first elastic jaw is composed of elastic jaw units evenly arranged with the center of the indicator chuck as the center. The first elastic jaw is covered with a first locking nut. The inner wall of the first locking nut is provided with a first internal thread. The outer periphery of the first elastic jaw is provided with a first external thread that mates with the first internal thread.

3. The digital crankshaft measuring instrument as described in claim 2, characterized in that: The bottom of the indicator chuck is provided with a second external thread, and the longitudinal hole is provided with a second internal thread that mates with the second external thread.

4. The digital crankshaft measuring instrument according to claim 1, characterized in that: The connecting rod reset component is a connecting rod reset spring. The connecting rod is provided with a connecting rod reset spring stop block. The top end of the connecting rod reset spring is fixed in the longitudinal hole, and the bottom end of the connecting rod reset spring abuts against the connecting rod reset spring stop block.

5. A digital crankshaft measuring instrument as described in claim 1, characterized in that: The sidewall of the transverse through hole is provided with a limiting block, and the slider is provided with a limiting groove that cooperates with the limiting block.

6. A digital crankshaft measuring instrument as described in claim 1, characterized in that: A positioning probe fixing component is fixedly installed inside the transverse through hole. The positioning probe fixing component is sleeve-shaped. The slider is slidably installed inside the positioning probe fixing component. The positioning probe fixing component has an opening corresponding to the longitudinal hole. The movable probe reset component is located inside the positioning probe fixing component. The positioning probe fixing component has a second elastic claw for clamping the positioning probe corresponding to the positioning probe. A second locking nut is sleeved on the second elastic claw. A third internal thread is provided on the inner wall of the second locking nut. A third external thread is provided on the outer periphery of the second elastic claw to cooperate with the third internal thread.

7. A digital crankshaft measuring instrument as described in claim 6, characterized in that: The movable probe reset component is a movable probe reset spring. One end of the movable probe reset spring is located at the bottom of the sleeve of the positioning probe fixing component, and the other end abuts against the slider.

8. A digital crankshaft measuring instrument as described in claim 1, characterized in that: The mounting base is provided with a counterweight at its bottom, and the counterweight is rotatably connected to the mounting base.

9. A digital crankshaft measuring instrument as described in claim 8, characterized in that: The mounting base has counterweight mounting plates at both ends, which are rotatably connected to the mounting base. The two ends of the counterweight are fixedly connected to the corresponding counterweight mounting plates. The counterweight has a counterweight positioning member protruding from the middle of the counterweight. The counterweight positioning member is movably disposed inside the counterweight through an elastic member, and the top of the counterweight positioning member abuts against the mounting base.

10. A digital crankshaft measuring instrument as described in claim 1, characterized in that: A connecting rod positioning bushing is fixedly installed inside the longitudinal hole, and the connecting rod positioning bushing has a connecting rod positioning hole that slides with the connecting rod.

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