Crankshaft two-end hole inner chamfer measuring tool

Abstract

The utility model relates to the technical field of crankshaft detection tools, and provides a tool for measuring chamfers in holes in two ends of a crankshaft, which aims at solving the problem that the measurement is inconvenient due to the fact that the crankshaft is difficult to place when the chamfers at the two ends of the crankshaft with larger volume and larger mass are measured, and comprises a measuring steel ball, the drift diameter of the measuring steel ball is larger than the chamfer aperture of the two ends of the crankshaft. A limiting sleeve seat is arranged at one end, far away from the crankshaft, of the measuring steel ball, a measuring instrument is arranged on one side, far away from the measuring steel ball, of the limiting sleeve seat, an elastic piece is arranged between the measuring instrument and the measuring steel ball in a penetrating mode, and the elastic piece is in a compressed state. For a crankshaft with a large size and a large mass, the crankshaft does not need to be carried to a specific position and a specific placing angle, and components such as the measuring steel ball and the like can be used for joint cooperation work, so that the chamfer of the crankshaft is directly measured.

Description

Technical Field

[0001] The utility model relates to the technical field of crankshaft inspection tools, in particular to a tool for measuring chamfers in holes at both ends of a crankshaft. Background Art

[0002] The crankshaft is a crucial component in mechanical equipment such as internal combustion engines, primarily used to convert the linear motion of the piston into rotational motion, thereby driving the engine. Crankshaft chamfering refers to the beveled surface treatment applied to the crankshaft's edge. Its purpose is to reduce stress concentration, effectively lower the risk of fracture, improve lubrication, reduce friction, and enhance fatigue strength and durability. The size, shape, and dimensional accuracy of the crankshaft chamfer directly impact its performance during operation. Therefore, precise measurement of the crankshaft's chamfer is essential after production to ensure product quality.

[0003] For example, patent publication number CN217980161U provides a measuring fixture for quickly measuring the chamfer of a crankshaft's big end. The fixture comprises a first base plate and a second base plate, each of which has an adjustment slot disposed thereon, each containing an adjustment assembly. A graduated scale is disposed on the left side of the first base plate's surface. By rotating the rotary handle, the second bevel gear drives the first bevel gear to rotate. As the lead screw rotates, the moving block in the adjustment slot moves, driving one end of the chamfer plate to move, thereby moving the hinge plate in the connecting sleeve. This facilitates adjustment of the chamfer plate's inclination angle, and the matching of the arrow and the graduated scale allows the relevant dimensions of the chamfer plate to be understood.

[0004] However, for the crankshafts in some large mechanical products, they are large in size and heavy, up to tens of kilograms. When aligning and measuring the crankshaft end with the existing measuring device such as the above-mentioned one, there are problems such as difficult crankshaft placement and difficult measurement operations. Utility Model Content

[0005] The purpose of this utility model is to solve the problem that the measurement of the chamfers of large and heavy crankshafts at both ends is difficult due to the difficulty in positioning the crankshaft. This application provides a tool for measuring the chamfers of the holes at both ends of the crankshaft. Without moving the crankshaft to a specific position and placement angle, the crankshaft chamfers can be directly measured by using components such as a measuring steel ball.

[0006] The utility model is achieved through the following technical solutions:

[0007] A tool for measuring the chamfers in holes at both ends of a crankshaft, comprising a measuring steel ball, the diameter of which is larger than the diameter of the chamfered holes at both ends of the crankshaft; a limiting sleeve is arranged at one end of the measuring steel ball away from the crankshaft, a measuring instrument is arranged at the side of the limiting sleeve away from the measuring steel ball, an elastic member is inserted between the measuring instrument and the measuring steel ball, and the elastic member is in a compressed state.

[0008] Preferably, a support seat is provided on one side of the measuring instrument close to the limit sleeve, one end of the elastic member is detachably connected to the support seat, and the other end of the elastic member passes through the limit sleeve and abuts against the measuring steel ball.

[0009] Preferably, the measuring instrument is provided with a protruding positioning rod, the positioning rod is passed through the center of the support base, and the elastic member is also passed through the center of the support base and abuts against the end of the positioning rod.

[0010] Preferably, the support base is provided with a fixing bolt, which passes through the support base in a direction perpendicular to the positioning rod, and the end of the fixing bolt can abut against the side wall surface of the positioning rod.

[0011] Preferably, the support base is provided with a connecting bolt, and the connecting bolt is sequentially passed through the support base and the limiting sleeve along the direction of the positioning rod and the elastic member.

[0012] Preferably, the limiting sleeve includes a sleeve, one end of which can be clamped with the measuring steel ball, and the inner side wall of the sleeve is protruded with a limiting ring, which can limit the measuring steel ball in the sleeve.

[0013] Preferably, an extension ring is provided at one end of the sleeve away from the measuring steel ball, the extension direction of the extension ring is perpendicular to the axis of the sleeve, and the connecting bolt is sequentially passed through the support seat and the extension ring.

[0014] The technical solution of the utility model has the following beneficial effects:

[0015] The utility model provides a tool for measuring the chamfers of the holes at both ends of a crankshaft, which can solve the problem that the existing crankshaft chamfer measuring device needs to fix the crankshaft to a specific position for measurement, but it is inconvenient to measure the crankshaft with large volume and heavy mass due to the need to move it unchanged. That is, there is no need to move the crankshaft to a specific position and place it at an angle, and the crankshaft chamfer can be directly measured by using components such as a measuring steel ball to work together. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the structure of the chamfer measurement tool for the crankshaft end holes in Example 1;

[0018] Figure 2 Schematic diagram of the cross-sectional structure of the limiting sleeve in Example 1;

[0019] Figure 3 Schematic diagram of the structure of the limiting sleeve in Example 1;

[0020] Figure 4 Schematic diagram of the cross-sectional structure of the support base in Example 1;

[0021] Figure 5 This is a schematic structural diagram of the support stand in Example 1.

[0022] Icon: 1-measuring steel ball, 2-limiting sleeve, 21-sleeve, 22-limiting ring, 23-extension ring, 3-measuring instrument, 31-positioning rod, 4-elastic part, 5-supporting seat, 51-fixing bolt, 52-connecting bolt, 6-crankshaft. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0026] Example 1

[0027] like Figures 1 to 5 As shown, this embodiment provides a chamfer measuring tool for the holes at both ends of a crankshaft, including a measuring steel ball 1, the diameter of the measuring steel ball 1 being larger than the chamfer hole diameter at both ends of the crankshaft 6; a limiting sleeve 2 is configured at the end of the measuring steel ball 1 away from the crankshaft 6, and a measuring instrument 3 is configured on the side of the limiting sleeve 2 away from the measuring steel ball 1, and an elastic member 4 is passed between the measuring instrument 3 and the measuring steel ball 1. In this embodiment, a spring is used as the elastic member 4, and the elastic member 4 is in a compressed state.

[0028] The chamfer measurement fixture for the two end holes of the crankshaft 6 in this embodiment allows direct measurement without having to move the crankshaft 6 to a specific position or placement angle. An elastic member 4 and a measuring steel ball 1 are placed in the inner hole of the measuring fixture, and the measuring steel ball 1 is fixed in position by a retaining ring 22. Under the action of the elastic member 4, the measuring steel ball 1 remains stable and can abut the chamfer at the end of the crankshaft 6. The measuring instrument 3 is then pushed toward the crankshaft 6. The inner hole of the fixture is automatically centered and aligned using the outer diameter of the measuring steel ball 1, overcoming the spring force. Using the measuring steel ball 1 as a reference, the end face of the fixture is placed flush against the end face of the crankshaft 6, and the length and dimensions of the chamfer can be measured according to the data on the table.

[0029] In this embodiment, a support base 5 is provided on the side of the measuring instrument 3 close to the limit sleeve 2, and a positioning rod 31 is protruded from the measuring instrument 3. The positioning rod 31 is passed through the center of the support base 5. One end of the elastic member 4 is also passed through the center of the support base 5 and abuts against the end of the positioning rod 31. The other end of the elastic member 4 passes through the limit sleeve 2 and abuts against the measuring steel ball 1.

[0030] In this embodiment, the support base 5 is provided with a fixing bolt 51, which is passed through the support base 5 in a direction perpendicular to the positioning rod 31, and the end of the fixing bolt 51 can abut against the side wall surface of the positioning rod 31; the support base 5 is provided with a connecting bolt 52, which is passed through the support base 5 and the limiting sleeve 2 in sequence along the direction of the positioning rod 31 and the elastic member 4.

[0031] In this embodiment, the limiting sleeve 2 includes a sleeve 21, one end of which can be clamped with the measuring steel ball 1, and a limiting ring 22 is protruding from the inner wall of the sleeve 21, which can limit the measuring steel ball 1 in the sleeve 21; an extension ring 23 is provided at the end of the sleeve 21 away from the measuring steel ball 1, and the extension direction of the extension ring 23 is perpendicular to the tube axis of the sleeve 21, and the connecting bolt 52 is sequentially passed through the support seat 5 and the extension ring 23.

[0032] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A chamfer measuring tool for the holes at both ends of a crankshaft, characterized in that: It comprises a measuring steel ball (1), wherein the diameter of the measuring steel ball (1) is larger than the chamfered hole diameters at both ends of the crankshaft; A limiting sleeve (2) is provided at one end of the measuring steel ball (1) away from the crankshaft, a measuring instrument (3) is provided at one side of the limiting sleeve (2) away from the measuring steel ball (1), an elastic member (4) is provided between the measuring instrument (3) and the measuring steel ball (1), and the elastic member (4) is in a compressed state.

2. The chamfer measuring tool for crankshaft end holes according to claim 1, characterized in that: A support seat (5) is provided on one side of the measuring instrument (3) close to the limit sleeve (2); one end of the elastic member (4) is detachably connected to the support seat (5); and the other end of the elastic member (4) passes through the limit sleeve (2) and abuts against the measuring steel ball (1).

3. The chamfer measuring tool for crankshaft end holes according to claim 2, characterized in that: The measuring instrument (3) is provided with a positioning rod (31) protruding therefrom. The positioning rod (31) is passed through the center of the support meter seat (5). The elastic member (4) is also passed through the center of the support meter seat (5) and abuts against the end of the positioning rod (31).

4. The chamfer measuring tool for crankshaft end holes according to claim 3, characterized in that: The support base (5) is provided with a fixing bolt (51), which is passed through the support base (5) in a direction perpendicular to the positioning rod (31), and the end of the fixing bolt (51) can abut against the side wall surface of the positioning rod (31).

5. The tool for measuring the chamfers of the crankshaft end holes according to claim 3, characterized in that: The support base (5) is provided with a connecting bolt (52), and the connecting bolt (52) is sequentially passed through the support base (5) and the limiting sleeve (2) along the direction of the positioning rod (31) and the elastic member (4).

6. The tool for measuring the chamfers of the crankshaft end holes according to claim 5, characterized in that: The limiting sleeve (2) comprises a sleeve (21), one end of which can be engaged with the measuring steel ball (1), and a limiting ring (22) is convexly provided on the inner side wall of the sleeve (21), and the limiting ring (22) can limit the measuring steel ball (1) in the sleeve (21).

7. The tool for measuring the chamfers of the crankshaft end holes according to claim 6, characterized in that: An extension ring (23) is provided at one end of the sleeve (21) away from the measuring steel ball (1), and the extension direction of the extension ring (23) is perpendicular to the axis of the sleeve (21). The connecting bolt (52) is sequentially passed through the support base (5) and the extension ring (23).

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